//! Repository pattern for file database operations.

use chrono::Utc;
use serde::Deserialize;
use sqlx::PgPool;
use uuid::Uuid;

use super::models::{
    CheckpointPatch, CheckpointPatchInfo, Contract, ContractChatConversation,
    ContractChatMessageRecord, ContractEvent, ContractRepository, ContractSummary,
    ContractTypeTemplateRecord, ConversationMessage, ConversationSnapshot,
    CreateContractRequest, CreateFileRequest, CreateTaskRequest,
    CreateTemplateRequest, Daemon, DaemonTaskAssignment, DaemonWithCapacity,
    DeliverableDefinition, Directive, DirectiveStep, DirectiveSummary,
    CreateDirectiveRequest, CreateDirectiveStepRequest, UpdateDirectiveRequest,
    UpdateDirectiveStepRequest,
    CreateOrderRequest, Order, UpdateOrderRequest,
    File, FileSummary, FileVersion, HistoryEvent, HistoryQueryFilters,
    MeshChatConversation, MeshChatMessageRecord, PhaseChangeResult, PhaseConfig,
    PhaseDefinition, SupervisorHeartbeatRecord, SupervisorState,
    Task, TaskCheckpoint, TaskEvent, TaskSummary, UpdateContractRequest,
    UpdateFileRequest, UpdateTaskRequest, UpdateTemplateRequest,
};

/// Repository error types.
#[derive(Debug)]
pub enum RepositoryError {
    /// Database error
    Database(sqlx::Error),
    /// Version conflict (optimistic locking failure)
    VersionConflict {
        /// The version the client expected
        expected: i32,
        /// The actual current version in the database
        actual: i32,
    },
}

impl From<sqlx::Error> for RepositoryError {
    fn from(e: sqlx::Error) -> Self {
        RepositoryError::Database(e)
    }
}

impl std::fmt::Display for RepositoryError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            RepositoryError::Database(e) => write!(f, "Database error: {}", e),
            RepositoryError::VersionConflict { expected, actual } => {
                write!(
                    f,
                    "Version conflict: expected {}, actual {}",
                    expected, actual
                )
            }
        }
    }
}

impl std::error::Error for RepositoryError {}

/// Generate a default name based on current timestamp.
fn generate_default_name() -> String {
    let now = Utc::now();
    now.format("Recording - %b %d %Y %H:%M:%S").to_string()
}

/// Internal request for creating files without contract association (e.g., audio transcription).
/// User-facing file creation should use CreateFileRequest which requires contract_id.
pub struct InternalCreateFileRequest {
    pub name: Option<String>,
    pub description: Option<String>,
    pub transcript: Vec<super::models::TranscriptEntry>,
    pub location: Option<String>,
}

/// Create a new file record (internal use, no contract required).
/// For user-facing file creation, use create_file_for_owner which requires a contract.
pub async fn create_file(pool: &PgPool, req: InternalCreateFileRequest) -> Result<File, sqlx::Error> {
    let name = req.name.unwrap_or_else(generate_default_name);
    let transcript_json = serde_json::to_value(&req.transcript).unwrap_or_default();
    let body_json = serde_json::to_value::<Vec<super::models::BodyElement>>(vec![]).unwrap();

    sqlx::query_as::<_, File>(
        r#"
        INSERT INTO files (name, description, transcript, location, summary, body)
        VALUES ($1, $2, $3, $4, NULL, $5)
        RETURNING id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
        "#,
    )
    .bind(&name)
    .bind(&req.description)
    .bind(&transcript_json)
    .bind(&req.location)
    .bind(&body_json)
    .fetch_one(pool)
    .await
}

/// Get a file by ID.
pub async fn get_file(pool: &PgPool, id: Uuid) -> Result<Option<File>, sqlx::Error> {
    sqlx::query_as::<_, File>(
        r#"
        SELECT id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
        FROM files
        WHERE id = $1
        "#,
    )
    .bind(id)
    .fetch_optional(pool)
    .await
}

/// List all files, ordered by created_at DESC.
pub async fn list_files(pool: &PgPool) -> Result<Vec<File>, sqlx::Error> {
    sqlx::query_as::<_, File>(
        r#"
        SELECT id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
        FROM files
        ORDER BY created_at DESC
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Update a file by ID with optimistic locking.
///
/// If `req.version` is provided, the update will only succeed if the current
/// version matches. Returns `RepositoryError::VersionConflict` if there's a mismatch.
///
/// If `req.version` is None (e.g., internal system updates), version checking is skipped.
pub async fn update_file(
    pool: &PgPool,
    id: Uuid,
    req: UpdateFileRequest,
) -> Result<Option<File>, RepositoryError> {
    // Get the existing file first
    let existing = get_file(pool, id).await?;
    let Some(existing) = existing else {
        return Ok(None);
    };

    // Check version if provided (optimistic locking)
    if let Some(expected_version) = req.version {
        if existing.version != expected_version {
            return Err(RepositoryError::VersionConflict {
                expected: expected_version,
                actual: existing.version,
            });
        }
    }

    // Apply updates
    let name = req.name.unwrap_or(existing.name);
    let description = req.description.or(existing.description);
    let transcript = req.transcript.unwrap_or(existing.transcript);
    let transcript_json = serde_json::to_value(&transcript).unwrap_or_default();
    let summary = req.summary.or(existing.summary);
    let body = req.body.unwrap_or(existing.body);
    let body_json = serde_json::to_value(&body).unwrap_or_default();

    // Update with version check in WHERE clause for race condition safety
    let result = if req.version.is_some() {
        sqlx::query_as::<_, File>(
            r#"
            UPDATE files
            SET name = $2, description = $3, transcript = $4, summary = $5, body = $6, updated_at = NOW()
            WHERE id = $1 AND version = $7
            RETURNING id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
            "#,
        )
        .bind(id)
        .bind(&name)
        .bind(&description)
        .bind(&transcript_json)
        .bind(&summary)
        .bind(&body_json)
        .bind(req.version.unwrap())
        .fetch_optional(pool)
        .await?
    } else {
        // No version check for internal updates
        sqlx::query_as::<_, File>(
            r#"
            UPDATE files
            SET name = $2, description = $3, transcript = $4, summary = $5, body = $6, updated_at = NOW()
            WHERE id = $1
            RETURNING id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
            "#,
        )
        .bind(id)
        .bind(&name)
        .bind(&description)
        .bind(&transcript_json)
        .bind(&summary)
        .bind(&body_json)
        .fetch_optional(pool)
        .await?
    };

    // If versioned update returned None, there was a race condition
    if result.is_none() && req.version.is_some() {
        // Re-fetch to get the actual version
        if let Some(current) = get_file(pool, id).await? {
            return Err(RepositoryError::VersionConflict {
                expected: req.version.unwrap(),
                actual: current.version,
            });
        }
    }

    Ok(result)
}

/// Delete a file by ID.
pub async fn delete_file(pool: &PgPool, id: Uuid) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM files
        WHERE id = $1
        "#,
    )
    .bind(id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Count total files.
pub async fn count_files(pool: &PgPool) -> Result<i64, sqlx::Error> {
    let result: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM files")
        .fetch_one(pool)
        .await?;

    Ok(result.0)
}

// =============================================================================
// Owner-Scoped File Functions
// =============================================================================

/// Create a new file record for a specific owner.
/// Files must belong to a contract - the contract_id is required and the phase is looked up.
pub async fn create_file_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    req: CreateFileRequest,
) -> Result<File, sqlx::Error> {
    let name = req.name.unwrap_or_else(generate_default_name);
    let transcript_json = serde_json::to_value(&req.transcript).unwrap_or_default();
    // Use body from request (may be empty or contain template elements)
    let body_json = serde_json::to_value(&req.body).unwrap_or_default();

    // Use provided contract_phase, or look up from contract's current phase
    let contract_phase: Option<String> = if req.contract_phase.is_some() {
        req.contract_phase
    } else {
        sqlx::query_scalar(
            "SELECT phase FROM contracts WHERE id = $1 AND owner_id = $2",
        )
        .bind(req.contract_id)
        .bind(owner_id)
        .fetch_optional(pool)
        .await?
    };

    sqlx::query_as::<_, File>(
        r#"
        INSERT INTO files (owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, repo_file_path)
        VALUES ($1, $2, $3, $4, $5, $6, $7, NULL, $8, $9)
        RETURNING id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
        "#,
    )
    .bind(owner_id)
    .bind(req.contract_id)
    .bind(&contract_phase)
    .bind(&name)
    .bind(&req.description)
    .bind(&transcript_json)
    .bind(&req.location)
    .bind(&body_json)
    .bind(&req.repo_file_path)
    .fetch_one(pool)
    .await
}

/// Get a file by ID, scoped to owner.
pub async fn get_file_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<Option<File>, sqlx::Error> {
    sqlx::query_as::<_, File>(
        r#"
        SELECT id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
        FROM files
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// List all files for an owner, ordered by created_at DESC.
pub async fn list_files_for_owner(pool: &PgPool, owner_id: Uuid) -> Result<Vec<File>, sqlx::Error> {
    sqlx::query_as::<_, File>(
        r#"
        SELECT id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
        FROM files
        WHERE owner_id = $1
        ORDER BY created_at DESC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Database row type for file summary with contract info
#[derive(Debug, sqlx::FromRow)]
struct FileSummaryRow {
    id: Uuid,
    contract_id: Option<Uuid>,
    contract_name: Option<String>,
    contract_phase: Option<String>,
    name: String,
    description: Option<String>,
    #[sqlx(json)]
    transcript: Vec<crate::db::models::TranscriptEntry>,
    version: i32,
    repo_file_path: Option<String>,
    repo_sync_status: Option<String>,
    created_at: chrono::DateTime<chrono::Utc>,
    updated_at: chrono::DateTime<chrono::Utc>,
}

/// List file summaries for an owner with contract info (joined).
pub async fn list_file_summaries_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<Vec<FileSummary>, sqlx::Error> {
    let rows = sqlx::query_as::<_, FileSummaryRow>(
        r#"
        SELECT
            f.id, f.contract_id, c.name as contract_name, f.contract_phase,
            f.name, f.description, f.transcript, f.version,
            f.repo_file_path, f.repo_sync_status, f.created_at, f.updated_at
        FROM files f
        LEFT JOIN contracts c ON f.contract_id = c.id
        WHERE f.owner_id = $1
        ORDER BY f.created_at DESC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await?;

    Ok(rows
        .into_iter()
        .map(|row| {
            let duration = row
                .transcript
                .iter()
                .map(|t| t.end)
                .fold(0.0_f32, f32::max);
            FileSummary {
                id: row.id,
                contract_id: row.contract_id,
                contract_name: row.contract_name,
                contract_phase: row.contract_phase,
                name: row.name,
                description: row.description,
                transcript_count: row.transcript.len(),
                duration: if duration > 0.0 { Some(duration) } else { None },
                version: row.version,
                repo_file_path: row.repo_file_path,
                repo_sync_status: row.repo_sync_status,
                created_at: row.created_at,
                updated_at: row.updated_at,
            }
        })
        .collect())
}

/// Update a file by ID with optimistic locking, scoped to owner.
pub async fn update_file_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
    req: UpdateFileRequest,
) -> Result<Option<File>, RepositoryError> {
    // Get the existing file first (scoped to owner)
    let existing = get_file_for_owner(pool, id, owner_id).await?;
    let Some(existing) = existing else {
        return Ok(None);
    };

    // Check version if provided (optimistic locking)
    if let Some(expected_version) = req.version {
        if existing.version != expected_version {
            return Err(RepositoryError::VersionConflict {
                expected: expected_version,
                actual: existing.version,
            });
        }
    }

    // Apply updates
    let name = req.name.unwrap_or(existing.name);
    let description = req.description.or(existing.description);
    let transcript = req.transcript.unwrap_or(existing.transcript);
    let transcript_json = serde_json::to_value(&transcript).unwrap_or_default();
    let summary = req.summary.or(existing.summary);
    let body = req.body.unwrap_or(existing.body);
    let body_json = serde_json::to_value(&body).unwrap_or_default();

    // Update with version check in WHERE clause for race condition safety
    let result = if req.version.is_some() {
        sqlx::query_as::<_, File>(
            r#"
            UPDATE files
            SET name = $3, description = $4, transcript = $5, summary = $6, body = $7, updated_at = NOW()
            WHERE id = $1 AND owner_id = $2 AND version = $8
            RETURNING id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
            "#,
        )
        .bind(id)
        .bind(owner_id)
        .bind(&name)
        .bind(&description)
        .bind(&transcript_json)
        .bind(&summary)
        .bind(&body_json)
        .bind(req.version.unwrap())
        .fetch_optional(pool)
        .await?
    } else {
        // No version check for internal updates
        sqlx::query_as::<_, File>(
            r#"
            UPDATE files
            SET name = $3, description = $4, transcript = $5, summary = $6, body = $7, updated_at = NOW()
            WHERE id = $1 AND owner_id = $2
            RETURNING id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
            "#,
        )
        .bind(id)
        .bind(owner_id)
        .bind(&name)
        .bind(&description)
        .bind(&transcript_json)
        .bind(&summary)
        .bind(&body_json)
        .fetch_optional(pool)
        .await?
    };

    // If versioned update returned None, there was a race condition
    if result.is_none() && req.version.is_some() {
        // Re-fetch to get the actual version
        if let Some(current) = get_file_for_owner(pool, id, owner_id).await? {
            return Err(RepositoryError::VersionConflict {
                expected: req.version.unwrap(),
                actual: current.version,
            });
        }
    }

    Ok(result)
}

/// Delete a file by ID, scoped to owner.
pub async fn delete_file_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM files
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

// =============================================================================
// Version History Functions
// =============================================================================

/// Set the version source for the current transaction.
/// This is used by the trigger to record who made the change.
pub async fn set_version_source(pool: &PgPool, source: &str) -> Result<(), sqlx::Error> {
    sqlx::query(&format!("SET LOCAL app.version_source = '{}'", source))
        .execute(pool)
        .await?;
    Ok(())
}

/// Set the change description for the current transaction.
pub async fn set_change_description(pool: &PgPool, description: &str) -> Result<(), sqlx::Error> {
    // Escape single quotes for SQL
    let escaped = description.replace('\'', "''");
    sqlx::query(&format!("SET LOCAL app.change_description = '{}'", escaped))
        .execute(pool)
        .await?;
    Ok(())
}

/// List all versions of a file, ordered by version DESC.
pub async fn list_file_versions(pool: &PgPool, file_id: Uuid) -> Result<Vec<FileVersion>, sqlx::Error> {
    // First get the current version from the files table
    let current = get_file(pool, file_id).await?;

    let mut versions = sqlx::query_as::<_, FileVersion>(
        r#"
        SELECT id, file_id, version, name, description, summary, body, source, change_description, created_at
        FROM file_versions
        WHERE file_id = $1
        ORDER BY version DESC
        "#,
    )
    .bind(file_id)
    .fetch_all(pool)
    .await?;

    // Add the current version as the first entry if it exists
    if let Some(file) = current {
        let current_version = FileVersion {
            id: file.id,
            file_id: file.id,
            version: file.version,
            name: file.name,
            description: file.description,
            summary: file.summary,
            body: file.body,
            source: "user".to_string(), // Current version source
            change_description: None,
            created_at: file.updated_at,
        };
        versions.insert(0, current_version);
    }

    Ok(versions)
}

/// Get a specific version of a file.
pub async fn get_file_version(
    pool: &PgPool,
    file_id: Uuid,
    version: i32,
) -> Result<Option<FileVersion>, sqlx::Error> {
    // First check if this is the current version
    if let Some(file) = get_file(pool, file_id).await? {
        if file.version == version {
            return Ok(Some(FileVersion {
                id: file.id,
                file_id: file.id,
                version: file.version,
                name: file.name,
                description: file.description,
                summary: file.summary,
                body: file.body,
                source: "user".to_string(),
                change_description: None,
                created_at: file.updated_at,
            }));
        }
    }

    // Otherwise, look in the versions table
    sqlx::query_as::<_, FileVersion>(
        r#"
        SELECT id, file_id, version, name, description, summary, body, source, change_description, created_at
        FROM file_versions
        WHERE file_id = $1 AND version = $2
        "#,
    )
    .bind(file_id)
    .bind(version)
    .fetch_optional(pool)
    .await
}

/// Restore a file to a previous version.
/// This creates a new version with the content from the target version.
pub async fn restore_file_version(
    pool: &PgPool,
    file_id: Uuid,
    target_version: i32,
    current_version: i32,
) -> Result<Option<File>, RepositoryError> {
    // Get the target version content
    let target = get_file_version(pool, file_id, target_version).await?;
    let Some(target) = target else {
        return Ok(None);
    };

    // Set version source and description for the trigger
    set_version_source(pool, "system").await?;
    set_change_description(pool, &format!("Restored from version {}", target_version)).await?;

    // Update the file with the target version's content
    // This will trigger the save_file_version trigger to save the current state first
    let update_req = UpdateFileRequest {
        name: Some(target.name),
        description: target.description,
        transcript: None,
        summary: target.summary,
        body: Some(target.body),
        version: Some(current_version),
        repo_file_path: None,
    };

    update_file(pool, file_id, update_req).await
}

/// Count versions for a file.
pub async fn count_file_versions(pool: &PgPool, file_id: Uuid) -> Result<i64, sqlx::Error> {
    let result: (i64,) = sqlx::query_as(
        "SELECT COUNT(*) + 1 FROM file_versions WHERE file_id = $1", // +1 for current version
    )
    .bind(file_id)
    .fetch_one(pool)
    .await?;

    Ok(result.0)
}

// =============================================================================
// Task Functions
// =============================================================================

/// Create a new task.
///
/// If creating a subtask (parent_task_id is set) and repository settings are not provided,
/// the subtask will inherit repository_url, base_branch, target_branch, merge_mode,
/// and target_repo_path from the parent task. Depth is calculated from parent and limited
/// to max 1 (2 levels: orchestrator at depth 0, subtasks at depth 1).
///
/// NOTE: completion_action is NOT inherited - subtasks should not auto-merge unless
/// explicitly configured. The supervisor controls when completion steps happen.
///
/// Task spawning is now controlled by supervisors at the application level.
/// Depth is no longer constrained in the database.
pub async fn create_task(pool: &PgPool, req: CreateTaskRequest) -> Result<Task, sqlx::Error> {
    // Calculate depth and inherit settings from parent if applicable
    let (depth, contract_id, repo_url, base_branch, target_branch, merge_mode, target_repo_path, completion_action) =
        if let Some(parent_id) = req.parent_task_id {
            // Fetch parent task to get depth and inherit settings
            let parent = get_task(pool, parent_id).await?
                .ok_or_else(|| sqlx::Error::RowNotFound)?;

            let new_depth = parent.depth + 1;

            // Subtasks inherit contract_id from parent (or use request contract_id if parent has none)
            let contract_id = parent.contract_id.or(req.contract_id);

            // Inherit repo settings if not provided
            let repo_url = req.repository_url.clone().or(parent.repository_url);
            let base_branch = req.base_branch.clone().or(parent.base_branch);
            let target_branch = req.target_branch.clone().or(parent.target_branch);
            let merge_mode = req.merge_mode.clone().or(parent.merge_mode);
            let target_repo_path = req.target_repo_path.clone().or(parent.target_repo_path);
            // NOTE: completion_action is NOT inherited - subtasks should not auto-merge.
            // The supervisor integrates subtask work from their worktrees.
            let completion_action = req.completion_action.clone();

            (new_depth, contract_id, repo_url, base_branch, target_branch, merge_mode, target_repo_path, completion_action)
        } else {
            // Top-level task: depth 0, use contract_id from request (may be None for branched tasks)
            (
                0,
                req.contract_id,
                req.repository_url.clone(),
                req.base_branch.clone(),
                req.target_branch.clone(),
                req.merge_mode.clone(),
                req.target_repo_path.clone(),
                req.completion_action.clone(),
            )
        };

    let copy_files_json = req.copy_files.as_ref().map(|f| serde_json::to_value(f).unwrap_or_default());

    sqlx::query_as::<_, Task>(
        r#"
        INSERT INTO tasks (
            contract_id, parent_task_id, depth, name, description, plan, priority,
            is_supervisor, repository_url, base_branch, target_branch, merge_mode,
            target_repo_path, completion_action, continue_from_task_id, copy_files,
            branched_from_task_id, conversation_state, supervisor_worktree_task_id
        )
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19)
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(req.parent_task_id)
    .bind(depth)
    .bind(&req.name)
    .bind(&req.description)
    .bind(&req.plan)
    .bind(req.priority)
    .bind(req.is_supervisor)
    .bind(&repo_url)
    .bind(&base_branch)
    .bind(&target_branch)
    .bind(&merge_mode)
    .bind(&target_repo_path)
    .bind(&completion_action)
    .bind(&req.continue_from_task_id)
    .bind(&copy_files_json)
    .bind(&req.branched_from_task_id)
    .bind(&req.conversation_history)
    .bind(&req.supervisor_worktree_task_id)
    .fetch_one(pool)
    .await
}

/// Get a task by ID.
pub async fn get_task(pool: &PgPool, id: Uuid) -> Result<Option<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        SELECT *
        FROM tasks
        WHERE id = $1
        "#,
    )
    .bind(id)
    .fetch_optional(pool)
    .await
}

/// List all top-level tasks (no parent), ordered by created_at DESC.
/// Hidden tasks are excluded by default.
pub async fn list_tasks(pool: &PgPool) -> Result<Vec<TaskSummary>, sqlx::Error> {
    sqlx::query_as::<_, TaskSummary>(
        r#"
        SELECT
            t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
            c.status as contract_status,
            t.parent_task_id, t.depth, t.name, t.status, t.priority,
            t.progress_summary,
            (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
            t.version, t.is_supervisor,             COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
        FROM tasks t
        LEFT JOIN contracts c ON t.contract_id = c.id
        WHERE t.parent_task_id IS NULL AND COALESCE(t.hidden, false) = false
        ORDER BY t.priority DESC, t.created_at DESC
        "#,
    )
    .fetch_all(pool)
    .await
}

/// List subtasks of a parent task.
pub async fn list_subtasks(pool: &PgPool, parent_id: Uuid) -> Result<Vec<TaskSummary>, sqlx::Error> {
    sqlx::query_as::<_, TaskSummary>(
        r#"
        SELECT
            t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
            c.status as contract_status,
            t.parent_task_id, t.depth, t.name, t.status, t.priority,
            t.progress_summary,
            (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
            t.version, t.is_supervisor,             COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
        FROM tasks t
        LEFT JOIN contracts c ON t.contract_id = c.id
        WHERE t.parent_task_id = $1
        ORDER BY t.priority DESC, t.created_at DESC
        "#,
    )
    .bind(parent_id)
    .fetch_all(pool)
    .await
}

/// List all tasks in a contract (for supervisor tree view).
pub async fn list_tasks_by_contract(
    pool: &PgPool,
    contract_id: Uuid,
    owner_id: Uuid,
) -> Result<Vec<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        SELECT * FROM tasks
        WHERE contract_id = $1 AND owner_id = $2
        ORDER BY is_supervisor DESC, depth ASC, created_at ASC
        "#,
    )
    .bind(contract_id)
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Get pending tasks for a contract (non-supervisor tasks only).
/// Includes tasks that were interrupted (retry candidates).
/// Prioritizes interrupted tasks and excludes those that exceeded max_retries.
pub async fn get_pending_tasks_for_contract(
    pool: &PgPool,
    contract_id: Uuid,
    owner_id: Uuid,
) -> Result<Vec<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        SELECT t.* FROM tasks t
        WHERE t.contract_id = $1 AND t.owner_id = $2
          AND t.status = 'pending'
          AND t.retry_count < t.max_retries
          AND t.is_supervisor = false
        ORDER BY
          t.interrupted_at DESC NULLS LAST,
          t.priority DESC,
          t.created_at ASC
        "#,
    )
    .bind(contract_id)
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Get all contracts that have pending tasks awaiting retry.
/// Returns tuples of (contract_id, owner_id) for contracts with retryable tasks.
pub async fn get_all_pending_task_contracts(
    pool: &PgPool,
) -> Result<Vec<(Uuid, Uuid)>, sqlx::Error> {
    sqlx::query_as::<_, (Uuid, Uuid)>(
        r#"
        SELECT DISTINCT t.contract_id, t.owner_id
        FROM tasks t
        WHERE t.contract_id IS NOT NULL
          AND t.status = 'pending'
          AND t.retry_count < t.max_retries
          AND t.is_supervisor = false
        ORDER BY t.owner_id, t.contract_id
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Mark a task as pending for retry after daemon failure.
/// Increments retry count and adds the failed daemon to exclusion list.
pub async fn mark_task_for_retry(
    pool: &PgPool,
    task_id: Uuid,
    failed_daemon_id: Uuid,
) -> Result<Option<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        UPDATE tasks
        SET status = 'pending',
            daemon_id = NULL,
            retry_count = retry_count + 1,
            failed_daemon_ids = array_append(COALESCE(failed_daemon_ids, '{}'), $2),
            last_active_daemon_id = $2,
            interrupted_at = NOW(),
            error_message = 'Daemon disconnected, awaiting retry',
            updated_at = NOW()
        WHERE id = $1
          AND retry_count < max_retries
        RETURNING *
        "#,
    )
    .bind(task_id)
    .bind(failed_daemon_id)
    .fetch_optional(pool)
    .await
}

/// Mark a task as permanently failed (exceeded retry limit).
pub async fn mark_task_permanently_failed(
    pool: &PgPool,
    task_id: Uuid,
    failed_daemon_id: Uuid,
) -> Result<(), sqlx::Error> {
    sqlx::query(
        r#"
        UPDATE tasks
        SET status = 'failed',
            daemon_id = NULL,
            retry_count = retry_count + 1,
            failed_daemon_ids = array_append(COALESCE(failed_daemon_ids, '{}'), $2),
            last_active_daemon_id = $2,
            error_message = 'Task failed: exceeded maximum retry attempts',
            updated_at = NOW()
        WHERE id = $1
        "#,
    )
    .bind(task_id)
    .bind(failed_daemon_id)
    .execute(pool)
    .await?;
    Ok(())
}

/// Update a task by ID with optimistic locking.
pub async fn update_task(
    pool: &PgPool,
    id: Uuid,
    req: UpdateTaskRequest,
) -> Result<Option<Task>, RepositoryError> {
    // Get the existing task first
    let existing = get_task(pool, id).await?;
    let Some(existing) = existing else {
        return Ok(None);
    };

    // Check version if provided (optimistic locking)
    if let Some(expected_version) = req.version {
        if existing.version != expected_version {
            return Err(RepositoryError::VersionConflict {
                expected: expected_version,
                actual: existing.version,
            });
        }
    }

    // Apply updates
    let name = req.name.unwrap_or(existing.name);
    let description = req.description.or(existing.description);
    let plan = req.plan.unwrap_or(existing.plan);
    let status = req.status.unwrap_or(existing.status);
    let priority = req.priority.unwrap_or(existing.priority);
    let progress_summary = req.progress_summary.or(existing.progress_summary);
    let last_output = req.last_output.or(existing.last_output);
    let error_message = req.error_message.or(existing.error_message);
    let merge_mode = req.merge_mode.or(existing.merge_mode);
    let pr_url = req.pr_url.or(existing.pr_url);
    let target_repo_path = req.target_repo_path.or(existing.target_repo_path);
    let completion_action = req.completion_action.or(existing.completion_action);
    // Handle clear_daemon_id: if true, set to NULL; otherwise use provided value or keep existing
    let daemon_id = if req.clear_daemon_id {
        None
    } else {
        req.daemon_id.or(existing.daemon_id)
    };

    // Update with version check in WHERE clause for race condition safety
    let result = if req.version.is_some() {
        sqlx::query_as::<_, Task>(
            r#"
            UPDATE tasks
            SET name = $2, description = $3, plan = $4, status = $5, priority = $6,
                progress_summary = $7, last_output = $8, error_message = $9,
                merge_mode = $10, pr_url = $11, daemon_id = $12,
                target_repo_path = $13, completion_action = $14, updated_at = NOW()
            WHERE id = $1 AND version = $15
            RETURNING *
            "#,
        )
        .bind(id)
        .bind(&name)
        .bind(&description)
        .bind(&plan)
        .bind(&status)
        .bind(priority)
        .bind(&progress_summary)
        .bind(&last_output)
        .bind(&error_message)
        .bind(&merge_mode)
        .bind(&pr_url)
        .bind(daemon_id)
        .bind(&target_repo_path)
        .bind(&completion_action)
        .bind(req.version.unwrap())
        .fetch_optional(pool)
        .await?
    } else {
        sqlx::query_as::<_, Task>(
            r#"
            UPDATE tasks
            SET name = $2, description = $3, plan = $4, status = $5, priority = $6,
                progress_summary = $7, last_output = $8, error_message = $9,
                merge_mode = $10, pr_url = $11, daemon_id = $12,
                target_repo_path = $13, completion_action = $14, updated_at = NOW()
            WHERE id = $1
            RETURNING *
            "#,
        )
        .bind(id)
        .bind(&name)
        .bind(&description)
        .bind(&plan)
        .bind(&status)
        .bind(priority)
        .bind(&progress_summary)
        .bind(&last_output)
        .bind(&error_message)
        .bind(&merge_mode)
        .bind(&pr_url)
        .bind(daemon_id)
        .bind(&target_repo_path)
        .bind(&completion_action)
        .fetch_optional(pool)
        .await?
    };

    // If versioned update returned None, there was a race condition
    if result.is_none() && req.version.is_some() {
        if let Some(current) = get_task(pool, id).await? {
            return Err(RepositoryError::VersionConflict {
                expected: req.version.unwrap(),
                actual: current.version,
            });
        }
    }

    Ok(result)
}

/// Delete a task by ID.
pub async fn delete_task(pool: &PgPool, id: Uuid) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM tasks
        WHERE id = $1
        "#,
    )
    .bind(id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Count total tasks.
pub async fn count_tasks(pool: &PgPool) -> Result<i64, sqlx::Error> {
    let result: (i64,) = sqlx::query_as(
        "SELECT COUNT(*) FROM tasks WHERE parent_task_id IS NULL",
    )
    .fetch_one(pool)
    .await?;

    Ok(result.0)
}

// =============================================================================
// Owner-Scoped Task Functions
// =============================================================================

/// Create a new task for a specific owner.
pub async fn create_task_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    req: CreateTaskRequest,
) -> Result<Task, sqlx::Error> {
    // Calculate depth and inherit settings from parent if applicable
    let (depth, contract_id, repo_url, base_branch, target_branch, merge_mode, target_repo_path, completion_action) =
        if let Some(parent_id) = req.parent_task_id {
            // Fetch parent task to get depth and inherit settings (must belong to same owner)
            let parent = get_task_for_owner(pool, parent_id, owner_id).await?
                .ok_or_else(|| sqlx::Error::RowNotFound)?;

            let new_depth = parent.depth + 1;

            // Validate max depth
            if new_depth >= 2 {
                return Err(sqlx::Error::Protocol(format!(
                    "Maximum task depth exceeded. Cannot create subtask at depth {} (max is 1). Subtasks cannot have children.",
                    new_depth
                )));
            }

            // Subtasks inherit contract_id from parent (or use request contract_id if parent has none)
            let contract_id = parent.contract_id.or(req.contract_id);

            // Inherit repo settings if not provided
            let repo_url = req.repository_url.clone().or(parent.repository_url);
            let base_branch = req.base_branch.clone().or(parent.base_branch);
            let target_branch = req.target_branch.clone().or(parent.target_branch);
            let merge_mode = req.merge_mode.clone().or(parent.merge_mode);
            let target_repo_path = req.target_repo_path.clone().or(parent.target_repo_path);
            // NOTE: completion_action is NOT inherited - subtasks should not auto-merge.
            // The orchestrator integrates subtask work from their worktrees.
            let completion_action = req.completion_action.clone();

            (new_depth, contract_id, repo_url, base_branch, target_branch, merge_mode, target_repo_path, completion_action)
        } else {
            // Top-level task: depth 0, use contract_id from request (may be None for branched tasks)
            (
                0,
                req.contract_id,
                req.repository_url.clone(),
                req.base_branch.clone(),
                req.target_branch.clone(),
                req.merge_mode.clone(),
                req.target_repo_path.clone(),
                req.completion_action.clone(),
            )
        };

    let copy_files_json = req.copy_files.as_ref().map(|f| serde_json::to_value(f).unwrap_or_default());

    sqlx::query_as::<_, Task>(
        r#"
        INSERT INTO tasks (
            owner_id, contract_id, parent_task_id, depth, name, description, plan, priority,
            is_supervisor, repository_url, base_branch, target_branch, merge_mode,
            target_repo_path, completion_action, continue_from_task_id, copy_files,
            branched_from_task_id, conversation_state, supervisor_worktree_task_id,
            directive_id, directive_step_id
        )
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22)
        RETURNING *
        "#,
    )
    .bind(owner_id)
    .bind(contract_id)
    .bind(req.parent_task_id)
    .bind(depth)
    .bind(&req.name)
    .bind(&req.description)
    .bind(&req.plan)
    .bind(req.priority)
    .bind(req.is_supervisor)
    .bind(&repo_url)
    .bind(&base_branch)
    .bind(&target_branch)
    .bind(&merge_mode)
    .bind(&target_repo_path)
    .bind(&completion_action)
    .bind(&req.continue_from_task_id)
    .bind(&copy_files_json)
    .bind(&req.branched_from_task_id)
    .bind(&req.conversation_history)
    .bind(&req.supervisor_worktree_task_id)
    .bind(&req.directive_id)
    .bind(&req.directive_step_id)
    .fetch_one(pool)
    .await
}

/// Get a task by ID, scoped to owner.
pub async fn get_task_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<Option<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        SELECT *
        FROM tasks
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// List all top-level tasks (no parent) for an owner, ordered by created_at DESC.
/// Hidden tasks are excluded by default.
pub async fn list_tasks_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<Vec<TaskSummary>, sqlx::Error> {
    sqlx::query_as::<_, TaskSummary>(
        r#"
        SELECT
            t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
            c.status as contract_status,
            t.parent_task_id, t.depth, t.name, t.status, t.priority,
            t.progress_summary,
            (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
            t.version, t.is_supervisor,             COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
        FROM tasks t
        LEFT JOIN contracts c ON t.contract_id = c.id
        WHERE t.owner_id = $1 AND t.parent_task_id IS NULL AND COALESCE(t.hidden, false) = false
        ORDER BY t.priority DESC, t.created_at DESC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// List subtasks of a parent task, scoped to owner.
pub async fn list_subtasks_for_owner(
    pool: &PgPool,
    parent_id: Uuid,
    owner_id: Uuid,
) -> Result<Vec<TaskSummary>, sqlx::Error> {
    sqlx::query_as::<_, TaskSummary>(
        r#"
        SELECT
            t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
            c.status as contract_status,
            t.parent_task_id, t.depth, t.name, t.status, t.priority,
            t.progress_summary,
            (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
            t.version, t.is_supervisor,             COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
        FROM tasks t
        LEFT JOIN contracts c ON t.contract_id = c.id
        WHERE t.owner_id = $1 AND t.parent_task_id = $2
        ORDER BY t.priority DESC, t.created_at DESC
        "#,
    )
    .bind(owner_id)
    .bind(parent_id)
    .fetch_all(pool)
    .await
}

/// Update a task by ID with optimistic locking, scoped to owner.
pub async fn update_task_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
    req: UpdateTaskRequest,
) -> Result<Option<Task>, RepositoryError> {
    // Get the existing task first (scoped to owner)
    let existing = get_task_for_owner(pool, id, owner_id).await?;
    let Some(existing) = existing else {
        return Ok(None);
    };

    // Check version if provided (optimistic locking)
    if let Some(expected_version) = req.version {
        if existing.version != expected_version {
            return Err(RepositoryError::VersionConflict {
                expected: expected_version,
                actual: existing.version,
            });
        }
    }

    // Apply updates
    let name = req.name.unwrap_or(existing.name);
    let description = req.description.or(existing.description);
    let plan = req.plan.unwrap_or(existing.plan);
    let status = req.status.unwrap_or(existing.status);
    let priority = req.priority.unwrap_or(existing.priority);
    let progress_summary = req.progress_summary.or(existing.progress_summary);
    let last_output = req.last_output.or(existing.last_output);
    let error_message = req.error_message.or(existing.error_message);
    let merge_mode = req.merge_mode.or(existing.merge_mode);
    let pr_url = req.pr_url.or(existing.pr_url);
    let repository_url = req.repository_url.or(existing.repository_url);
    let target_repo_path = req.target_repo_path.or(existing.target_repo_path);
    let completion_action = req.completion_action.or(existing.completion_action);
    let hidden = req.hidden.unwrap_or(existing.hidden);
    let daemon_id = if req.clear_daemon_id {
        None
    } else {
        req.daemon_id.or(existing.daemon_id)
    };

    // Update with version check in WHERE clause for race condition safety
    let result = if req.version.is_some() {
        sqlx::query_as::<_, Task>(
            r#"
            UPDATE tasks
            SET name = $3, description = $4, plan = $5, status = $6, priority = $7,
                progress_summary = $8, last_output = $9, error_message = $10,
                merge_mode = $11, pr_url = $12, daemon_id = $13,
                target_repo_path = $14, completion_action = $15, repository_url = $16,
                hidden = $17, updated_at = NOW()
            WHERE id = $1 AND owner_id = $2 AND version = $18
            RETURNING *
            "#,
        )
        .bind(id)
        .bind(owner_id)
        .bind(&name)
        .bind(&description)
        .bind(&plan)
        .bind(&status)
        .bind(priority)
        .bind(&progress_summary)
        .bind(&last_output)
        .bind(&error_message)
        .bind(&merge_mode)
        .bind(&pr_url)
        .bind(daemon_id)
        .bind(&target_repo_path)
        .bind(&completion_action)
        .bind(&repository_url)
        .bind(hidden)
        .bind(req.version.unwrap())
        .fetch_optional(pool)
        .await?
    } else {
        sqlx::query_as::<_, Task>(
            r#"
            UPDATE tasks
            SET name = $3, description = $4, plan = $5, status = $6, priority = $7,
                progress_summary = $8, last_output = $9, error_message = $10,
                merge_mode = $11, pr_url = $12, daemon_id = $13,
                target_repo_path = $14, completion_action = $15, repository_url = $16,
                hidden = $17, updated_at = NOW()
            WHERE id = $1 AND owner_id = $2
            RETURNING *
            "#,
        )
        .bind(id)
        .bind(owner_id)
        .bind(&name)
        .bind(&description)
        .bind(&plan)
        .bind(&status)
        .bind(priority)
        .bind(&progress_summary)
        .bind(&last_output)
        .bind(&error_message)
        .bind(&merge_mode)
        .bind(&pr_url)
        .bind(daemon_id)
        .bind(&target_repo_path)
        .bind(&completion_action)
        .bind(&repository_url)
        .bind(hidden)
        .fetch_optional(pool)
        .await?
    };

    // If versioned update returned None, there was a race condition
    if result.is_none() && req.version.is_some() {
        if let Some(current) = get_task_for_owner(pool, id, owner_id).await? {
            return Err(RepositoryError::VersionConflict {
                expected: req.version.unwrap(),
                actual: current.version,
            });
        }
    }

    Ok(result)
}

/// Delete a task by ID, scoped to owner.
pub async fn delete_task_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM tasks
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Update task status and record event.
pub async fn update_task_status(
    pool: &PgPool,
    id: Uuid,
    new_status: &str,
    event_data: Option<serde_json::Value>,
) -> Result<Option<Task>, sqlx::Error> {
    // Get existing status
    let existing = get_task(pool, id).await?;
    let Some(existing) = existing else {
        return Ok(None);
    };

    let previous_status = existing.status.clone();

    // Update task status
    let task = sqlx::query_as::<_, Task>(
        r#"
        UPDATE tasks
        SET status = $2, updated_at = NOW(),
            started_at = CASE WHEN $2 = 'running' AND started_at IS NULL THEN NOW() ELSE started_at END,
            completed_at = CASE WHEN $2 IN ('done', 'failed', 'merged') THEN NOW() ELSE completed_at END
        WHERE id = $1
        RETURNING *
        "#,
    )
    .bind(id)
    .bind(new_status)
    .fetch_optional(pool)
    .await?;

    // Record event
    if task.is_some() {
        let _ = create_task_event(
            pool,
            id,
            "status_change",
            Some(&previous_status),
            Some(new_status),
            event_data,
        )
        .await;
    }

    Ok(task)
}

// =============================================================================
// Task Event Functions
// =============================================================================

/// Create a task event.
pub async fn create_task_event(
    pool: &PgPool,
    task_id: Uuid,
    event_type: &str,
    previous_status: Option<&str>,
    new_status: Option<&str>,
    event_data: Option<serde_json::Value>,
) -> Result<TaskEvent, sqlx::Error> {
    sqlx::query_as::<_, TaskEvent>(
        r#"
        INSERT INTO task_events (task_id, event_type, previous_status, new_status, event_data)
        VALUES ($1, $2, $3, $4, $5)
        RETURNING *
        "#,
    )
    .bind(task_id)
    .bind(event_type)
    .bind(previous_status)
    .bind(new_status)
    .bind(event_data)
    .fetch_one(pool)
    .await
}

/// List events for a task.
pub async fn list_task_events(
    pool: &PgPool,
    task_id: Uuid,
    limit: Option<i64>,
) -> Result<Vec<TaskEvent>, sqlx::Error> {
    let limit = limit.unwrap_or(100);
    sqlx::query_as::<_, TaskEvent>(
        r#"
        SELECT *
        FROM task_events
        WHERE task_id = $1
        ORDER BY created_at DESC
        LIMIT $2
        "#,
    )
    .bind(task_id)
    .bind(limit)
    .fetch_all(pool)
    .await
}

// =============================================================================
// Daemon Functions
// =============================================================================

/// Register a new daemon connection.
pub async fn register_daemon(
    pool: &PgPool,
    owner_id: Uuid,
    connection_id: &str,
    hostname: Option<&str>,
    machine_id: Option<&str>,
    max_concurrent_tasks: i32,
) -> Result<Daemon, sqlx::Error> {
    sqlx::query_as::<_, Daemon>(
        r#"
        INSERT INTO daemons (owner_id, connection_id, hostname, machine_id, max_concurrent_tasks)
        VALUES ($1, $2, $3, $4, $5)
        RETURNING *
        "#,
    )
    .bind(owner_id)
    .bind(connection_id)
    .bind(hostname)
    .bind(machine_id)
    .bind(max_concurrent_tasks)
    .fetch_one(pool)
    .await
}

/// Get a daemon by ID.
pub async fn get_daemon(pool: &PgPool, id: Uuid) -> Result<Option<Daemon>, sqlx::Error> {
    sqlx::query_as::<_, Daemon>(
        r#"
        SELECT *
        FROM daemons
        WHERE id = $1
        "#,
    )
    .bind(id)
    .fetch_optional(pool)
    .await
}

/// Get a daemon by connection ID.
pub async fn get_daemon_by_connection(
    pool: &PgPool,
    connection_id: &str,
) -> Result<Option<Daemon>, sqlx::Error> {
    sqlx::query_as::<_, Daemon>(
        r#"
        SELECT *
        FROM daemons
        WHERE connection_id = $1
        "#,
    )
    .bind(connection_id)
    .fetch_optional(pool)
    .await
}

/// List all daemons.
pub async fn list_daemons(pool: &PgPool) -> Result<Vec<Daemon>, sqlx::Error> {
    sqlx::query_as::<_, Daemon>(
        r#"
        SELECT *
        FROM daemons
        ORDER BY connected_at DESC
        "#,
    )
    .fetch_all(pool)
    .await
}

/// List daemons for a specific owner.
pub async fn list_daemons_for_owner(pool: &PgPool, owner_id: Uuid) -> Result<Vec<Daemon>, sqlx::Error> {
    sqlx::query_as::<_, Daemon>(
        r#"
        SELECT *
        FROM daemons
        WHERE owner_id = $1
        ORDER BY connected_at DESC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Get a daemon by ID for a specific owner.
pub async fn get_daemon_for_owner(pool: &PgPool, id: Uuid, owner_id: Uuid) -> Result<Option<Daemon>, sqlx::Error> {
    sqlx::query_as::<_, Daemon>(
        r#"
        SELECT *
        FROM daemons
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// Update daemon heartbeat.
pub async fn update_daemon_heartbeat(pool: &PgPool, id: Uuid) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        UPDATE daemons
        SET last_heartbeat_at = NOW(), status = 'connected'
        WHERE id = $1
        "#,
    )
    .bind(id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Update daemon status.
pub async fn update_daemon_status(
    pool: &PgPool,
    id: Uuid,
    status: &str,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        UPDATE daemons
        SET status = $2,
            disconnected_at = CASE WHEN $2 = 'disconnected' THEN NOW() ELSE disconnected_at END
        WHERE id = $1
        "#,
    )
    .bind(id)
    .bind(status)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Mark daemon as disconnected by connection_id.
pub async fn disconnect_daemon_by_connection(
    pool: &PgPool,
    connection_id: &str,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        UPDATE daemons
        SET status = 'disconnected',
            disconnected_at = NOW()
        WHERE connection_id = $1
        "#,
    )
    .bind(connection_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Update daemon task count.
pub async fn update_daemon_task_count(
    pool: &PgPool,
    id: Uuid,
    delta: i32,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        UPDATE daemons
        SET current_task_count = GREATEST(0, current_task_count + $2)
        WHERE id = $1
        "#,
    )
    .bind(id)
    .bind(delta)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Delete a daemon by ID.
pub async fn delete_daemon(pool: &PgPool, id: Uuid) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM daemons
        WHERE id = $1
        "#,
    )
    .bind(id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Delete a daemon by connection ID.
pub async fn delete_daemon_by_connection(
    pool: &PgPool,
    connection_id: &str,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM daemons
        WHERE connection_id = $1
        "#,
    )
    .bind(connection_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Count connected daemons.
pub async fn count_daemons(pool: &PgPool) -> Result<i64, sqlx::Error> {
    let result: (i64,) = sqlx::query_as(
        "SELECT COUNT(*) FROM daemons WHERE status = 'connected'",
    )
    .fetch_one(pool)
    .await?;

    Ok(result.0)
}

/// Delete stale daemons that haven't sent a heartbeat within the timeout.
/// Returns the number of deleted daemons.
pub async fn delete_stale_daemons(
    pool: &PgPool,
    timeout_seconds: i64,
) -> Result<u64, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM daemons
        WHERE last_heartbeat_at < NOW() - INTERVAL '1 second' * $1
        "#,
    )
    .bind(timeout_seconds)
    .execute(pool)
    .await?;

    Ok(result.rows_affected())
}

// =============================================================================
// Sibling Awareness Functions
// =============================================================================

/// List sibling tasks (tasks with the same parent, excluding the given task).
pub async fn list_sibling_tasks(
    pool: &PgPool,
    task_id: Uuid,
    parent_id: Option<Uuid>,
) -> Result<Vec<TaskSummary>, sqlx::Error> {
    match parent_id {
        Some(parent) => {
            sqlx::query_as::<_, TaskSummary>(
                r#"
                SELECT
                    t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
                    c.status as contract_status,
                    t.parent_task_id, t.depth, t.name, t.status, t.priority,
                    t.progress_summary,
                    (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
                    t.version, t.is_supervisor,                     COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
                FROM tasks t
                LEFT JOIN contracts c ON t.contract_id = c.id
                WHERE t.parent_task_id = $1 AND t.id != $2
                ORDER BY t.priority DESC, t.created_at DESC
                "#,
            )
            .bind(parent)
            .bind(task_id)
            .fetch_all(pool)
            .await
        }
        None => {
            // Top-level tasks (no parent) - siblings are other top-level tasks
            sqlx::query_as::<_, TaskSummary>(
                r#"
                SELECT
                    t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
                    c.status as contract_status,
                    t.parent_task_id, t.depth, t.name, t.status, t.priority,
                    t.progress_summary,
                    (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
                    t.version, t.is_supervisor,                     COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
                FROM tasks t
                LEFT JOIN contracts c ON t.contract_id = c.id
                WHERE t.parent_task_id IS NULL AND t.id != $1
                ORDER BY t.priority DESC, t.created_at DESC
                "#,
            )
            .bind(task_id)
            .fetch_all(pool)
            .await
        }
    }
}

/// Get running sibling tasks (for context injection).
pub async fn get_running_siblings(
    pool: &PgPool,
    owner_id: Uuid,
    task_id: Uuid,
    parent_id: Option<Uuid>,
) -> Result<Vec<Task>, sqlx::Error> {
    match parent_id {
        Some(parent) => {
            sqlx::query_as::<_, Task>(
                r#"
                SELECT *
                FROM tasks t
                WHERE t.owner_id = $1
                    AND t.parent_task_id = $2
                    AND t.id != $3
                    AND t.status = 'running'
                ORDER BY t.priority DESC
                "#,
            )
            .bind(owner_id)
            .bind(parent)
            .bind(task_id)
            .fetch_all(pool)
            .await
        }
        None => {
            sqlx::query_as::<_, Task>(
                r#"
                SELECT *
                FROM tasks t
                WHERE t.owner_id = $1
                    AND t.parent_task_id IS NULL
                    AND t.id != $2
                    AND t.status = 'running'
                ORDER BY t.priority DESC
                "#,
            )
            .bind(owner_id)
            .bind(task_id)
            .fetch_all(pool)
            .await
        }
    }
}

/// Get task with its siblings for context awareness.
pub async fn get_task_with_siblings(
    pool: &PgPool,
    id: Uuid,
) -> Result<Option<(Task, Vec<TaskSummary>)>, sqlx::Error> {
    let task = get_task(pool, id).await?;
    let Some(task) = task else {
        return Ok(None);
    };

    let siblings = list_sibling_tasks(pool, id, task.parent_task_id).await?;
    Ok(Some((task, siblings)))
}

// =============================================================================
// Task Output Persistence Functions
// =============================================================================

/// Save task output to the database.
/// This stores output in the task_events table with event_type='output'.
pub async fn save_task_output(
    pool: &PgPool,
    task_id: Uuid,
    message_type: &str,
    content: &str,
    tool_name: Option<&str>,
    tool_input: Option<serde_json::Value>,
    is_error: Option<bool>,
    cost_usd: Option<f64>,
    duration_ms: Option<u64>,
) -> Result<TaskEvent, sqlx::Error> {
    let event_data = serde_json::json!({
        "messageType": message_type,
        "content": content,
        "toolName": tool_name,
        "toolInput": tool_input,
        "isError": is_error,
        "costUsd": cost_usd,
        "durationMs": duration_ms,
    });

    create_task_event(pool, task_id, "output", None, None, Some(event_data)).await
}

/// Get task output from the database.
/// Retrieves all output events for a task, ordered by creation time.
pub async fn get_task_output(
    pool: &PgPool,
    task_id: Uuid,
    limit: Option<i64>,
) -> Result<Vec<TaskEvent>, sqlx::Error> {
    let limit = limit.unwrap_or(1000);
    sqlx::query_as::<_, TaskEvent>(
        r#"
        SELECT *
        FROM task_events
        WHERE task_id = $1 AND event_type = 'output'
        ORDER BY created_at ASC
        LIMIT $2
        "#,
    )
    .bind(task_id)
    .bind(limit)
    .fetch_all(pool)
    .await
}

/// Update task completion status with error message.
/// Sets the task status to 'done' or 'failed' and records completion time.
pub async fn complete_task(
    pool: &PgPool,
    task_id: Uuid,
    success: bool,
    error_message: Option<&str>,
) -> Result<Option<Task>, sqlx::Error> {
    let status = if success { "done" } else { "failed" };

    let task = sqlx::query_as::<_, Task>(
        r#"
        UPDATE tasks
        SET status = $2,
            error_message = COALESCE($3, error_message),
            completed_at = NOW(),
            updated_at = NOW()
        WHERE id = $1
        RETURNING *
        "#,
    )
    .bind(task_id)
    .bind(status)
    .bind(error_message)
    .fetch_optional(pool)
    .await?;

    // Record completion event
    if task.is_some() {
        let event_data = serde_json::json!({
            "success": success,
            "errorMessage": error_message,
        });
        let _ = create_task_event(
            pool,
            task_id,
            "complete",
            Some("running"),
            Some(status),
            Some(event_data),
        )
        .await;
    }

    Ok(task)
}

// =============================================================================
// Mesh Chat History Functions
// =============================================================================

/// Get or create the active conversation for an owner.
pub async fn get_or_create_active_conversation(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<MeshChatConversation, sqlx::Error> {
    // Try to get existing active conversation for this owner
    let existing = sqlx::query_as::<_, MeshChatConversation>(
        r#"
        SELECT *
        FROM mesh_chat_conversations
        WHERE is_active = true AND owner_id = $1
        LIMIT 1
        "#,
    )
    .bind(owner_id)
    .fetch_optional(pool)
    .await?;

    if let Some(conv) = existing {
        return Ok(conv);
    }

    // Create new conversation
    sqlx::query_as::<_, MeshChatConversation>(
        r#"
        INSERT INTO mesh_chat_conversations (owner_id, is_active)
        VALUES ($1, true)
        RETURNING *
        "#,
    )
    .bind(owner_id)
    .fetch_one(pool)
    .await
}

/// List messages for a conversation.
pub async fn list_chat_messages(
    pool: &PgPool,
    conversation_id: Uuid,
    limit: Option<i32>,
) -> Result<Vec<MeshChatMessageRecord>, sqlx::Error> {
    let limit = limit.unwrap_or(100);
    sqlx::query_as::<_, MeshChatMessageRecord>(
        r#"
        SELECT *
        FROM mesh_chat_messages
        WHERE conversation_id = $1
        ORDER BY created_at ASC
        LIMIT $2
        "#,
    )
    .bind(conversation_id)
    .bind(limit)
    .fetch_all(pool)
    .await
}

/// Add a message to a conversation.
#[allow(clippy::too_many_arguments)]
pub async fn add_chat_message(
    pool: &PgPool,
    conversation_id: Uuid,
    role: &str,
    content: &str,
    context_type: &str,
    context_task_id: Option<Uuid>,
    tool_calls: Option<serde_json::Value>,
    pending_questions: Option<serde_json::Value>,
) -> Result<MeshChatMessageRecord, sqlx::Error> {
    sqlx::query_as::<_, MeshChatMessageRecord>(
        r#"
        INSERT INTO mesh_chat_messages
        (conversation_id, role, content, context_type, context_task_id, tool_calls, pending_questions)
        VALUES ($1, $2, $3, $4, $5, $6, $7)
        RETURNING *
        "#,
    )
    .bind(conversation_id)
    .bind(role)
    .bind(content)
    .bind(context_type)
    .bind(context_task_id)
    .bind(tool_calls)
    .bind(pending_questions)
    .fetch_one(pool)
    .await
}

/// Clear conversation (archive existing and create new).
pub async fn clear_conversation(pool: &PgPool, owner_id: Uuid) -> Result<MeshChatConversation, sqlx::Error> {
    // Mark existing as inactive for this owner
    sqlx::query(
        r#"
        UPDATE mesh_chat_conversations
        SET is_active = false, updated_at = NOW()
        WHERE is_active = true AND owner_id = $1
        "#,
    )
    .bind(owner_id)
    .execute(pool)
    .await?;

    // Create new active conversation
    get_or_create_active_conversation(pool, owner_id).await
}

// =============================================================================
// Contract Chat History Functions
// =============================================================================

/// Get or create the active conversation for a contract.
pub async fn get_or_create_contract_conversation(
    pool: &PgPool,
    contract_id: Uuid,
    owner_id: Uuid,
) -> Result<ContractChatConversation, sqlx::Error> {
    // Try to get existing active conversation for this contract
    let existing = sqlx::query_as::<_, ContractChatConversation>(
        r#"
        SELECT *
        FROM contract_chat_conversations
        WHERE is_active = true AND contract_id = $1 AND owner_id = $2
        LIMIT 1
        "#,
    )
    .bind(contract_id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await?;

    if let Some(conv) = existing {
        return Ok(conv);
    }

    // Create new conversation
    sqlx::query_as::<_, ContractChatConversation>(
        r#"
        INSERT INTO contract_chat_conversations (contract_id, owner_id, is_active)
        VALUES ($1, $2, true)
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(owner_id)
    .fetch_one(pool)
    .await
}

/// List messages for a contract conversation.
pub async fn list_contract_chat_messages(
    pool: &PgPool,
    conversation_id: Uuid,
    limit: Option<i32>,
) -> Result<Vec<ContractChatMessageRecord>, sqlx::Error> {
    let limit = limit.unwrap_or(100);
    sqlx::query_as::<_, ContractChatMessageRecord>(
        r#"
        SELECT *
        FROM contract_chat_messages
        WHERE conversation_id = $1
        ORDER BY created_at ASC
        LIMIT $2
        "#,
    )
    .bind(conversation_id)
    .bind(limit)
    .fetch_all(pool)
    .await
}

/// Add a message to a contract conversation.
pub async fn add_contract_chat_message(
    pool: &PgPool,
    conversation_id: Uuid,
    role: &str,
    content: &str,
    tool_calls: Option<serde_json::Value>,
    pending_questions: Option<serde_json::Value>,
) -> Result<ContractChatMessageRecord, sqlx::Error> {
    sqlx::query_as::<_, ContractChatMessageRecord>(
        r#"
        INSERT INTO contract_chat_messages
        (conversation_id, role, content, tool_calls, pending_questions)
        VALUES ($1, $2, $3, $4, $5)
        RETURNING *
        "#,
    )
    .bind(conversation_id)
    .bind(role)
    .bind(content)
    .bind(tool_calls)
    .bind(pending_questions)
    .fetch_one(pool)
    .await
}

/// Clear contract conversation (archive existing and create new).
pub async fn clear_contract_conversation(
    pool: &PgPool,
    contract_id: Uuid,
    owner_id: Uuid,
) -> Result<ContractChatConversation, sqlx::Error> {
    // Mark existing as inactive for this contract
    sqlx::query(
        r#"
        UPDATE contract_chat_conversations
        SET is_active = false, updated_at = NOW()
        WHERE is_active = true AND contract_id = $1 AND owner_id = $2
        "#,
    )
    .bind(contract_id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    // Create new active conversation
    get_or_create_contract_conversation(pool, contract_id, owner_id).await
}

// =============================================================================
// Contract Type Template Functions (Owner-Scoped)
// =============================================================================

/// Create a new contract type template for a specific owner.
pub async fn create_template_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    req: CreateTemplateRequest,
) -> Result<ContractTypeTemplateRecord, sqlx::Error> {
    sqlx::query_as::<_, ContractTypeTemplateRecord>(
        r#"
        INSERT INTO contract_type_templates (owner_id, name, description, phases, default_phase, deliverables)
        VALUES ($1, $2, $3, $4, $5, $6)
        RETURNING *
        "#,
    )
    .bind(owner_id)
    .bind(&req.name)
    .bind(&req.description)
    .bind(serde_json::to_value(&req.phases).unwrap_or_default())
    .bind(&req.default_phase)
    .bind(match &req.deliverables {
        Some(d) => serde_json::to_value(d).ok(),
        None => None,
    })
    .fetch_one(pool)
    .await
}

/// Get a contract type template by ID, scoped to owner.
pub async fn get_template_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<Option<ContractTypeTemplateRecord>, sqlx::Error> {
    sqlx::query_as::<_, ContractTypeTemplateRecord>(
        r#"
        SELECT *
        FROM contract_type_templates
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// Get a contract type template by ID (internal use, no owner scoping).
pub async fn get_template_by_id(
    pool: &PgPool,
    id: Uuid,
) -> Result<Option<ContractTypeTemplateRecord>, sqlx::Error> {
    sqlx::query_as::<_, ContractTypeTemplateRecord>(
        r#"
        SELECT *
        FROM contract_type_templates
        WHERE id = $1
        "#,
    )
    .bind(id)
    .fetch_optional(pool)
    .await
}

/// List all contract type templates for an owner, ordered by name.
pub async fn list_templates_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<Vec<ContractTypeTemplateRecord>, sqlx::Error> {
    sqlx::query_as::<_, ContractTypeTemplateRecord>(
        r#"
        SELECT *
        FROM contract_type_templates
        WHERE owner_id = $1
        ORDER BY name ASC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Update a contract type template for an owner.
pub async fn update_template_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
    req: UpdateTemplateRequest,
) -> Result<Option<ContractTypeTemplateRecord>, RepositoryError> {
    // Build dynamic update query
    let mut query = String::from("UPDATE contract_type_templates SET updated_at = NOW()");
    let mut param_idx = 3; // $1 = id, $2 = owner_id

    if req.name.is_some() {
        query.push_str(&format!(", name = ${}", param_idx));
        param_idx += 1;
    }
    if req.description.is_some() {
        query.push_str(&format!(", description = ${}", param_idx));
        param_idx += 1;
    }
    if req.phases.is_some() {
        query.push_str(&format!(", phases = ${}", param_idx));
        param_idx += 1;
    }
    if req.default_phase.is_some() {
        query.push_str(&format!(", default_phase = ${}", param_idx));
        param_idx += 1;
    }
    if req.deliverables.is_some() {
        query.push_str(&format!(", deliverables = ${}", param_idx));
        param_idx += 1;
    }

    // Optimistic locking
    if req.version.is_some() {
        query.push_str(&format!(", version = version + 1 WHERE id = $1 AND owner_id = $2 AND version = ${}", param_idx));
    } else {
        query.push_str(", version = version + 1 WHERE id = $1 AND owner_id = $2");
    }
    query.push_str(" RETURNING *");

    let mut sql_query = sqlx::query_as::<_, ContractTypeTemplateRecord>(&query);
    sql_query = sql_query.bind(id).bind(owner_id);

    if let Some(ref name) = req.name {
        sql_query = sql_query.bind(name);
    }
    if let Some(ref description) = req.description {
        sql_query = sql_query.bind(description);
    }
    if let Some(ref phases) = req.phases {
        sql_query = sql_query.bind(serde_json::to_value(phases).unwrap_or_default());
    }
    if let Some(ref default_phase) = req.default_phase {
        sql_query = sql_query.bind(default_phase);
    }
    if let Some(ref deliverables) = req.deliverables {
        sql_query = sql_query.bind(serde_json::to_value(deliverables).unwrap_or_default());
    }
    if let Some(version) = req.version {
        sql_query = sql_query.bind(version);
    }

    match sql_query.fetch_optional(pool).await {
        Ok(result) => {
            if result.is_none() && req.version.is_some() {
                // Check if it's a version conflict
                if let Some(current) = get_template_for_owner(pool, id, owner_id).await? {
                    return Err(RepositoryError::VersionConflict {
                        expected: req.version.unwrap(),
                        actual: current.version,
                    });
                }
            }
            Ok(result)
        }
        Err(e) => Err(RepositoryError::Database(e)),
    }
}

/// Delete a contract type template for an owner.
pub async fn delete_template_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM contract_type_templates
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Helper function to build PhaseConfig from a template.
pub fn build_phase_config_from_template(template: &ContractTypeTemplateRecord) -> PhaseConfig {
    PhaseConfig {
        phases: template.phases.clone(),
        default_phase: template.default_phase.clone(),
        deliverables: template.deliverables.clone().unwrap_or_default(),
    }
}

/// Helper function to build PhaseConfig for built-in contract types.
pub fn build_phase_config_for_builtin(contract_type: &str) -> PhaseConfig {
    match contract_type {
        "simple" => PhaseConfig {
            phases: vec![
                PhaseDefinition { id: "plan".to_string(), name: "Plan".to_string(), order: 0 },
                PhaseDefinition { id: "execute".to_string(), name: "Execute".to_string(), order: 1 },
            ],
            default_phase: "plan".to_string(),
            deliverables: [
                ("plan".to_string(), vec![DeliverableDefinition {
                    id: "plan-document".to_string(),
                    name: "Plan".to_string(),
                    priority: "required".to_string(),
                }]),
                ("execute".to_string(), vec![DeliverableDefinition {
                    id: "pull-request".to_string(),
                    name: "Pull Request".to_string(),
                    priority: "required".to_string(),
                }]),
            ].into_iter().collect(),
        },
        "specification" => PhaseConfig {
            phases: vec![
                PhaseDefinition { id: "research".to_string(), name: "Research".to_string(), order: 0 },
                PhaseDefinition { id: "specify".to_string(), name: "Specify".to_string(), order: 1 },
                PhaseDefinition { id: "plan".to_string(), name: "Plan".to_string(), order: 2 },
                PhaseDefinition { id: "execute".to_string(), name: "Execute".to_string(), order: 3 },
                PhaseDefinition { id: "review".to_string(), name: "Review".to_string(), order: 4 },
            ],
            default_phase: "research".to_string(),
            deliverables: [
                ("research".to_string(), vec![DeliverableDefinition {
                    id: "research-notes".to_string(),
                    name: "Research Notes".to_string(),
                    priority: "required".to_string(),
                }]),
                ("specify".to_string(), vec![DeliverableDefinition {
                    id: "requirements-document".to_string(),
                    name: "Requirements Document".to_string(),
                    priority: "required".to_string(),
                }]),
                ("plan".to_string(), vec![DeliverableDefinition {
                    id: "plan-document".to_string(),
                    name: "Plan".to_string(),
                    priority: "required".to_string(),
                }]),
                ("execute".to_string(), vec![DeliverableDefinition {
                    id: "pull-request".to_string(),
                    name: "Pull Request".to_string(),
                    priority: "required".to_string(),
                }]),
                ("review".to_string(), vec![DeliverableDefinition {
                    id: "release-notes".to_string(),
                    name: "Release Notes".to_string(),
                    priority: "required".to_string(),
                }]),
            ].into_iter().collect(),
        },
        "execute" | _ => PhaseConfig {
            phases: vec![
                PhaseDefinition { id: "execute".to_string(), name: "Execute".to_string(), order: 0 },
            ],
            default_phase: "execute".to_string(),
            deliverables: std::collections::HashMap::new(),
        },
    }
}

// =============================================================================
// Contract Functions (Owner-Scoped)
// =============================================================================

/// Create a new contract for a specific owner.
/// Supports both built-in contract types (simple, specification, execute) and custom templates.
pub async fn create_contract_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    req: CreateContractRequest,
) -> Result<Contract, sqlx::Error> {
    // Determine phase configuration based on template_id or contract_type
    let (phase_config, contract_type_str, default_phase): (PhaseConfig, String, String) =
        if let Some(template_id) = req.template_id {
            // Look up the custom template
            let template = get_template_by_id(pool, template_id)
                .await?
                .ok_or_else(|| {
                    sqlx::Error::Protocol(format!("Template not found: {}", template_id))
                })?;

            let config = build_phase_config_from_template(&template);
            let default = config.default_phase.clone();
            // For custom templates, store the template name as the contract_type
            (config, template.name.clone(), default)
        } else {
            // Use built-in contract type
            let contract_type = req.contract_type.as_deref().unwrap_or("simple");

            // Validate contract type
            let valid_types = ["simple", "specification", "execute"];
            if !valid_types.contains(&contract_type) {
                return Err(sqlx::Error::Protocol(format!(
                    "Invalid contract_type '{}'. Must be one of: {} or provide a template_id",
                    contract_type,
                    valid_types.join(", ")
                )));
            }

            let config = build_phase_config_for_builtin(contract_type);
            let default = config.default_phase.clone();
            (config, contract_type.to_string(), default)
        };

    // Get valid phase IDs from the configuration
    let valid_phase_ids: Vec<String> = phase_config.phases.iter().map(|p| p.id.clone()).collect();

    // Use provided initial_phase or default based on contract type/template
    let phase = req.initial_phase.as_deref().unwrap_or(&default_phase);

    // Validate the phase is valid for this contract type/template
    if !valid_phase_ids.contains(&phase.to_string()) {
        return Err(sqlx::Error::Protocol(format!(
            "Invalid initial_phase '{}' for contract type '{}'. Must be one of: {}",
            phase,
            contract_type_str,
            valid_phase_ids.join(", ")
        )));
    }

    let autonomous_loop = req.autonomous_loop.unwrap_or(false);
    let phase_guard = req.phase_guard.unwrap_or(false);
    let local_only = req.local_only.unwrap_or(false);
    let auto_merge_local = req.auto_merge_local.unwrap_or(false);

    // Serialize phase_config to JSON
    let phase_config_json = serde_json::to_value(&phase_config).ok();

    sqlx::query_as::<_, Contract>(
        r#"
        INSERT INTO contracts (owner_id, name, description, contract_type, phase, autonomous_loop, phase_guard, local_only, auto_merge_local, phase_config)
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
        RETURNING *
        "#,
    )
    .bind(owner_id)
    .bind(&req.name)
    .bind(&req.description)
    .bind(&contract_type_str)
    .bind(phase)
    .bind(autonomous_loop)
    .bind(phase_guard)
    .bind(local_only)
    .bind(auto_merge_local)
    .bind(phase_config_json)
    .fetch_one(pool)
    .await
}

/// Get a contract by ID, scoped to owner.
pub async fn get_contract_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<Option<Contract>, sqlx::Error> {
    sqlx::query_as::<_, Contract>(
        r#"
        SELECT *
        FROM contracts
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// List all contracts for an owner, ordered by created_at DESC.
pub async fn list_contracts_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<Vec<ContractSummary>, sqlx::Error> {
    sqlx::query_as::<_, ContractSummary>(
        r#"
        SELECT
            c.id, c.name, c.description, c.contract_type, c.phase, c.status,
            c.supervisor_task_id, c.local_only, c.auto_merge_local, c.version, c.created_at,
            (SELECT COUNT(*) FROM files WHERE contract_id = c.id) as file_count,
            (SELECT COUNT(*) FROM tasks WHERE contract_id = c.id) as task_count,
            (SELECT COUNT(*) FROM contract_repositories WHERE contract_id = c.id) as repository_count
        FROM contracts c
        WHERE c.owner_id = $1
        ORDER BY c.created_at DESC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Get contract summary by ID.
pub async fn get_contract_summary_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<Option<ContractSummary>, sqlx::Error> {
    sqlx::query_as::<_, ContractSummary>(
        r#"
        SELECT
            c.id, c.name, c.description, c.contract_type, c.phase, c.status,
            c.supervisor_task_id, c.local_only, c.auto_merge_local, c.version, c.created_at,
            (SELECT COUNT(*) FROM files WHERE contract_id = c.id) as file_count,
            (SELECT COUNT(*) FROM tasks WHERE contract_id = c.id) as task_count,
            (SELECT COUNT(*) FROM contract_repositories WHERE contract_id = c.id) as repository_count
        FROM contracts c
        WHERE c.id = $1 AND c.owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// Update a contract by ID with optimistic locking, scoped to owner.
pub async fn update_contract_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
    req: UpdateContractRequest,
) -> Result<Option<Contract>, RepositoryError> {
    let existing = get_contract_for_owner(pool, id, owner_id).await?;
    let Some(existing) = existing else {
        return Ok(None);
    };

    // Check version if provided (optimistic locking)
    if let Some(expected_version) = req.version {
        if existing.version != expected_version {
            return Err(RepositoryError::VersionConflict {
                expected: expected_version,
                actual: existing.version,
            });
        }
    }

    // Apply updates
    let name = req.name.unwrap_or(existing.name);
    let description = req.description.or(existing.description);
    let phase = req.phase.unwrap_or(existing.phase);
    let status = req.status.unwrap_or(existing.status);
    let supervisor_task_id = req.supervisor_task_id.or(existing.supervisor_task_id);
    let autonomous_loop = req.autonomous_loop.unwrap_or(existing.autonomous_loop);
    let phase_guard = req.phase_guard.unwrap_or(existing.phase_guard);
    let local_only = req.local_only.unwrap_or(existing.local_only);
    let auto_merge_local = req.auto_merge_local.unwrap_or(existing.auto_merge_local);

    let result = if req.version.is_some() {
        sqlx::query_as::<_, Contract>(
            r#"
            UPDATE contracts
            SET name = $3, description = $4, phase = $5, status = $6,
                supervisor_task_id = $7, autonomous_loop = $8, phase_guard = $9, local_only = $10, auto_merge_local = $11, version = version + 1, updated_at = NOW()
            WHERE id = $1 AND owner_id = $2 AND version = $12
            RETURNING *
            "#,
        )
        .bind(id)
        .bind(owner_id)
        .bind(&name)
        .bind(&description)
        .bind(&phase)
        .bind(&status)
        .bind(supervisor_task_id)
        .bind(autonomous_loop)
        .bind(phase_guard)
        .bind(local_only)
        .bind(auto_merge_local)
        .bind(req.version.unwrap())
        .fetch_optional(pool)
        .await?
    } else {
        sqlx::query_as::<_, Contract>(
            r#"
            UPDATE contracts
            SET name = $3, description = $4, phase = $5, status = $6,
                supervisor_task_id = $7, autonomous_loop = $8, phase_guard = $9, local_only = $10, auto_merge_local = $11, version = version + 1, updated_at = NOW()
            WHERE id = $1 AND owner_id = $2
            RETURNING *
            "#,
        )
        .bind(id)
        .bind(owner_id)
        .bind(&name)
        .bind(&description)
        .bind(&phase)
        .bind(&status)
        .bind(supervisor_task_id)
        .bind(autonomous_loop)
        .bind(phase_guard)
        .bind(local_only)
        .bind(auto_merge_local)
        .fetch_optional(pool)
        .await?
    };

    // If versioned update returned None, there was a race condition
    if result.is_none() && req.version.is_some() {
        if let Some(current) = get_contract_for_owner(pool, id, owner_id).await? {
            return Err(RepositoryError::VersionConflict {
                expected: req.version.unwrap(),
                actual: current.version,
            });
        }
    }

    Ok(result)
}

/// Delete a contract by ID, scoped to owner.
pub async fn delete_contract_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM contracts
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Change contract phase and record event.
///
/// This is the simple version without version checking. Use `change_contract_phase_with_version`
/// for explicit version conflict detection.
pub async fn change_contract_phase_for_owner(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
    new_phase: &str,
) -> Result<Option<Contract>, sqlx::Error> {
    // Get current phase
    let existing = get_contract_for_owner(pool, id, owner_id).await?;
    let Some(existing) = existing else {
        return Ok(None);
    };

    let previous_phase = existing.phase.clone();

    // Update phase
    let contract = sqlx::query_as::<_, Contract>(
        r#"
        UPDATE contracts
        SET phase = $3, version = version + 1, updated_at = NOW()
        WHERE id = $1 AND owner_id = $2
        RETURNING *
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .bind(new_phase)
    .fetch_optional(pool)
    .await?;

    // Record event
    if contract.is_some() {
        sqlx::query(
            r#"
            INSERT INTO contract_events (contract_id, event_type, previous_phase, new_phase)
            VALUES ($1, 'phase_change', $2, $3)
            "#,
        )
        .bind(id)
        .bind(&previous_phase)
        .bind(new_phase)
        .execute(pool)
        .await?;
    }

    Ok(contract)
}

/// Change contract phase with explicit version checking for conflict detection.
///
/// Uses `SELECT ... FOR UPDATE` to lock the row and prevent race conditions.
/// Returns `PhaseChangeResult::VersionConflict` if the expected version doesn't match.
pub async fn change_contract_phase_with_version(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
    new_phase: &str,
    expected_version: Option<i32>,
) -> Result<PhaseChangeResult, sqlx::Error> {
    // Start a transaction to ensure atomicity with row locking
    let mut tx = pool.begin().await?;

    // Lock the row with SELECT FOR UPDATE and get current state
    let existing: Option<Contract> = sqlx::query_as::<_, Contract>(
        r#"
        SELECT *
        FROM contracts
        WHERE id = $1 AND owner_id = $2
        FOR UPDATE
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(&mut *tx)
    .await?;

    let Some(existing) = existing else {
        tx.rollback().await?;
        return Ok(PhaseChangeResult::NotFound);
    };

    // Check version if provided (optimistic locking)
    if let Some(expected) = expected_version {
        if existing.version != expected {
            tx.rollback().await?;
            return Ok(PhaseChangeResult::VersionConflict {
                expected,
                actual: existing.version,
                current_phase: existing.phase,
            });
        }
    }

    // Validate the phase transition is allowed
    let valid_phases = existing.valid_phase_ids();
    if !valid_phases.contains(&new_phase.to_string()) {
        tx.rollback().await?;
        return Ok(PhaseChangeResult::ValidationFailed {
            reason: format!(
                "Invalid phase '{}' for contract type '{}'",
                new_phase, existing.contract_type
            ),
            missing_requirements: vec![format!(
                "Phase must be one of: {}",
                valid_phases.join(", ")
            )],
        });
    }

    let previous_phase = existing.phase.clone();

    // Update phase with version increment
    let contract = sqlx::query_as::<_, Contract>(
        r#"
        UPDATE contracts
        SET phase = $3, version = version + 1, updated_at = NOW()
        WHERE id = $1 AND owner_id = $2
        RETURNING *
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .bind(new_phase)
    .fetch_one(&mut *tx)
    .await?;

    // Record event
    sqlx::query(
        r#"
        INSERT INTO contract_events (contract_id, event_type, previous_phase, new_phase)
        VALUES ($1, 'phase_change', $2, $3)
        "#,
    )
    .bind(id)
    .bind(&previous_phase)
    .bind(new_phase)
    .execute(&mut *tx)
    .await?;

    // Commit the transaction
    tx.commit().await?;

    Ok(PhaseChangeResult::Success(contract))
}

// =============================================================================
// Contract Repository Functions
// =============================================================================

/// List repositories for a contract.
pub async fn list_contract_repositories(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Vec<ContractRepository>, sqlx::Error> {
    sqlx::query_as::<_, ContractRepository>(
        r#"
        SELECT *
        FROM contract_repositories
        WHERE contract_id = $1
        ORDER BY is_primary DESC, created_at ASC
        "#,
    )
    .bind(contract_id)
    .fetch_all(pool)
    .await
}

/// Add a remote repository to a contract.
pub async fn add_remote_repository(
    pool: &PgPool,
    contract_id: Uuid,
    name: &str,
    repository_url: &str,
    is_primary: bool,
) -> Result<ContractRepository, sqlx::Error> {
    // If is_primary, clear other primaries first
    if is_primary {
        sqlx::query(
            r#"
            UPDATE contract_repositories
            SET is_primary = false, updated_at = NOW()
            WHERE contract_id = $1 AND is_primary = true
            "#,
        )
        .bind(contract_id)
        .execute(pool)
        .await?;
    }

    sqlx::query_as::<_, ContractRepository>(
        r#"
        INSERT INTO contract_repositories (contract_id, name, repository_url, source_type, status, is_primary)
        VALUES ($1, $2, $3, 'remote', 'ready', $4)
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(name)
    .bind(repository_url)
    .bind(is_primary)
    .fetch_one(pool)
    .await
}

/// Add a local repository to a contract.
pub async fn add_local_repository(
    pool: &PgPool,
    contract_id: Uuid,
    name: &str,
    local_path: &str,
    is_primary: bool,
) -> Result<ContractRepository, sqlx::Error> {
    // If is_primary, clear other primaries first
    if is_primary {
        sqlx::query(
            r#"
            UPDATE contract_repositories
            SET is_primary = false, updated_at = NOW()
            WHERE contract_id = $1 AND is_primary = true
            "#,
        )
        .bind(contract_id)
        .execute(pool)
        .await?;
    }

    sqlx::query_as::<_, ContractRepository>(
        r#"
        INSERT INTO contract_repositories (contract_id, name, local_path, source_type, status, is_primary)
        VALUES ($1, $2, $3, 'local', 'ready', $4)
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(name)
    .bind(local_path)
    .bind(is_primary)
    .fetch_one(pool)
    .await
}

/// Create a managed repository (daemon will create it).
pub async fn create_managed_repository(
    pool: &PgPool,
    contract_id: Uuid,
    name: &str,
    is_primary: bool,
) -> Result<ContractRepository, sqlx::Error> {
    // If is_primary, clear other primaries first
    if is_primary {
        sqlx::query(
            r#"
            UPDATE contract_repositories
            SET is_primary = false, updated_at = NOW()
            WHERE contract_id = $1 AND is_primary = true
            "#,
        )
        .bind(contract_id)
        .execute(pool)
        .await?;
    }

    sqlx::query_as::<_, ContractRepository>(
        r#"
        INSERT INTO contract_repositories (contract_id, name, source_type, status, is_primary)
        VALUES ($1, $2, 'managed', 'pending', $3)
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(name)
    .bind(is_primary)
    .fetch_one(pool)
    .await
}

/// Delete a repository from a contract.
pub async fn delete_contract_repository(
    pool: &PgPool,
    repo_id: Uuid,
    contract_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM contract_repositories
        WHERE id = $1 AND contract_id = $2
        "#,
    )
    .bind(repo_id)
    .bind(contract_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Set a repository as primary (and clear others).
pub async fn set_repository_primary(
    pool: &PgPool,
    repo_id: Uuid,
    contract_id: Uuid,
) -> Result<bool, sqlx::Error> {
    // Clear other primaries
    sqlx::query(
        r#"
        UPDATE contract_repositories
        SET is_primary = false, updated_at = NOW()
        WHERE contract_id = $1 AND is_primary = true
        "#,
    )
    .bind(contract_id)
    .execute(pool)
    .await?;

    // Set this one as primary
    let result = sqlx::query(
        r#"
        UPDATE contract_repositories
        SET is_primary = true, updated_at = NOW()
        WHERE id = $1 AND contract_id = $2
        "#,
    )
    .bind(repo_id)
    .bind(contract_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Update managed repository status (used by daemon).
pub async fn update_managed_repository_status(
    pool: &PgPool,
    repo_id: Uuid,
    status: &str,
    repository_url: Option<&str>,
) -> Result<Option<ContractRepository>, sqlx::Error> {
    sqlx::query_as::<_, ContractRepository>(
        r#"
        UPDATE contract_repositories
        SET status = $2, repository_url = COALESCE($3, repository_url), updated_at = NOW()
        WHERE id = $1
        RETURNING *
        "#,
    )
    .bind(repo_id)
    .bind(status)
    .bind(repository_url)
    .fetch_optional(pool)
    .await
}

// =============================================================================
// Contract Task Association Functions
// =============================================================================

/// Add a task to a contract.
pub async fn add_task_to_contract(
    pool: &PgPool,
    contract_id: Uuid,
    task_id: Uuid,
    owner_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        UPDATE tasks
        SET contract_id = $2, updated_at = NOW()
        WHERE id = $1 AND owner_id = $3
        "#,
    )
    .bind(task_id)
    .bind(contract_id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Remove a task from a contract.
pub async fn remove_task_from_contract(
    pool: &PgPool,
    contract_id: Uuid,
    task_id: Uuid,
    owner_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        UPDATE tasks
        SET contract_id = NULL, updated_at = NOW()
        WHERE id = $1 AND contract_id = $2 AND owner_id = $3
        "#,
    )
    .bind(task_id)
    .bind(contract_id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// List files in a contract.
pub async fn list_files_in_contract(
    pool: &PgPool,
    contract_id: Uuid,
    owner_id: Uuid,
) -> Result<Vec<FileSummary>, sqlx::Error> {
    // Use a manual query since FileSummary doesn't have a FromRow derive with all the computed fields
    let files = sqlx::query_as::<_, File>(
        r#"
        SELECT id, owner_id, contract_id, contract_phase, name, description, transcript, location, summary, body, version, repo_file_path, repo_synced_at, repo_sync_status, created_at, updated_at
        FROM files
        WHERE contract_id = $1 AND owner_id = $2
        ORDER BY created_at DESC
        "#,
    )
    .bind(contract_id)
    .bind(owner_id)
    .fetch_all(pool)
    .await?;

    Ok(files.into_iter().map(FileSummary::from).collect())
}

/// List tasks in a contract.
pub async fn list_tasks_in_contract(
    pool: &PgPool,
    contract_id: Uuid,
    owner_id: Uuid,
) -> Result<Vec<TaskSummary>, sqlx::Error> {
    sqlx::query_as::<_, TaskSummary>(
        r#"
        SELECT
            t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
            c.status as contract_status,
            t.parent_task_id, t.depth, t.name, t.status, t.priority,
            t.progress_summary,
            (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
            t.version, t.is_supervisor,             COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
        FROM tasks t
        LEFT JOIN contracts c ON t.contract_id = c.id
        WHERE t.contract_id = $1 AND t.owner_id = $2
        ORDER BY t.priority DESC, t.created_at DESC
        "#,
    )
    .bind(contract_id)
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Minimal task info for worktree cleanup operations.
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct TaskWorktreeInfo {
    pub id: Uuid,
    pub daemon_id: Option<Uuid>,
    pub overlay_path: Option<String>,
    /// If set, this task shares the worktree of the specified supervisor task.
    /// Should NOT have its worktree deleted during cleanup.
    pub supervisor_worktree_task_id: Option<Uuid>,
}

/// List tasks in a contract with their daemon/worktree info.
/// Used for cleaning up worktrees when a contract is completed or deleted.
pub async fn list_contract_tasks_with_worktree_info(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Vec<TaskWorktreeInfo>, sqlx::Error> {
    sqlx::query_as::<_, TaskWorktreeInfo>(
        r#"
        SELECT id, daemon_id, overlay_path, supervisor_worktree_task_id
        FROM tasks
        WHERE contract_id = $1 AND (daemon_id IS NOT NULL OR overlay_path IS NOT NULL)
        "#,
    )
    .bind(contract_id)
    .fetch_all(pool)
    .await
}

// =============================================================================
// Contract Events
// =============================================================================

/// List events for a contract.
pub async fn list_contract_events(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Vec<ContractEvent>, sqlx::Error> {
    sqlx::query_as::<_, ContractEvent>(
        r#"
        SELECT *
        FROM contract_events
        WHERE contract_id = $1
        ORDER BY created_at DESC
        "#,
    )
    .bind(contract_id)
    .fetch_all(pool)
    .await
}

/// Record a contract event.
pub async fn record_contract_event(
    pool: &PgPool,
    contract_id: Uuid,
    event_type: &str,
    event_data: Option<serde_json::Value>,
) -> Result<ContractEvent, sqlx::Error> {
    sqlx::query_as::<_, ContractEvent>(
        r#"
        INSERT INTO contract_events (contract_id, event_type, event_data)
        VALUES ($1, $2, $3)
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(event_type)
    .bind(event_data)
    .fetch_one(pool)
    .await
}

// ============================================================================
// Task Checkpoints
// ============================================================================

/// Create a checkpoint for a task.
pub async fn create_task_checkpoint(
    pool: &PgPool,
    task_id: Uuid,
    commit_sha: &str,
    branch_name: &str,
    message: &str,
    files_changed: Option<serde_json::Value>,
    lines_added: Option<i32>,
    lines_removed: Option<i32>,
) -> Result<TaskCheckpoint, sqlx::Error> {
    // Get current checkpoint count and increment
    let checkpoint_number: i32 = sqlx::query_scalar(
        "SELECT COALESCE(MAX(checkpoint_number), 0) + 1 FROM task_checkpoints WHERE task_id = $1",
    )
    .bind(task_id)
    .fetch_one(pool)
    .await?;

    // Update task's checkpoint tracking
    sqlx::query(
        r#"
        UPDATE tasks
        SET last_checkpoint_sha = $1,
            checkpoint_count = $2,
            checkpoint_message = $3,
            updated_at = NOW()
        WHERE id = $4
        "#,
    )
    .bind(commit_sha)
    .bind(checkpoint_number)
    .bind(message)
    .bind(task_id)
    .execute(pool)
    .await?;

    sqlx::query_as::<_, TaskCheckpoint>(
        r#"
        INSERT INTO task_checkpoints (
            task_id, checkpoint_number, commit_sha, branch_name, message,
            files_changed, lines_added, lines_removed
        )
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
        RETURNING *
        "#,
    )
    .bind(task_id)
    .bind(checkpoint_number)
    .bind(commit_sha)
    .bind(branch_name)
    .bind(message)
    .bind(files_changed)
    .bind(lines_added)
    .bind(lines_removed)
    .fetch_one(pool)
    .await
}

/// Get a checkpoint by ID.
pub async fn get_task_checkpoint(
    pool: &PgPool,
    id: Uuid,
) -> Result<Option<TaskCheckpoint>, sqlx::Error> {
    sqlx::query_as::<_, TaskCheckpoint>("SELECT * FROM task_checkpoints WHERE id = $1")
        .bind(id)
        .fetch_optional(pool)
        .await
}

/// Get a checkpoint by commit SHA.
pub async fn get_task_checkpoint_by_sha(
    pool: &PgPool,
    commit_sha: &str,
) -> Result<Option<TaskCheckpoint>, sqlx::Error> {
    sqlx::query_as::<_, TaskCheckpoint>("SELECT * FROM task_checkpoints WHERE commit_sha = $1")
        .bind(commit_sha)
        .fetch_optional(pool)
        .await
}

/// List checkpoints for a task.
pub async fn list_task_checkpoints(
    pool: &PgPool,
    task_id: Uuid,
) -> Result<Vec<TaskCheckpoint>, sqlx::Error> {
    sqlx::query_as::<_, TaskCheckpoint>(
        "SELECT * FROM task_checkpoints WHERE task_id = $1 ORDER BY checkpoint_number DESC",
    )
    .bind(task_id)
    .fetch_all(pool)
    .await
}

// ============================================================================
// Supervisor State
// ============================================================================

/// Create or update supervisor state for a contract.
pub async fn upsert_supervisor_state(
    pool: &PgPool,
    contract_id: Uuid,
    task_id: Uuid,
    conversation_history: serde_json::Value,
    pending_task_ids: &[Uuid],
    phase: &str,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        INSERT INTO supervisor_states (contract_id, task_id, conversation_history, pending_task_ids, phase, last_activity)
        VALUES ($1, $2, $3, $4, $5, NOW())
        ON CONFLICT (contract_id) DO UPDATE SET
            task_id = EXCLUDED.task_id,
            conversation_history = EXCLUDED.conversation_history,
            pending_task_ids = EXCLUDED.pending_task_ids,
            phase = EXCLUDED.phase,
            last_activity = NOW(),
            updated_at = NOW()
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(task_id)
    .bind(conversation_history)
    .bind(pending_task_ids)
    .bind(phase)
    .fetch_one(pool)
    .await
}

/// Get supervisor state for a contract.
pub async fn get_supervisor_state(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Option<SupervisorState>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>("SELECT * FROM supervisor_states WHERE contract_id = $1")
        .bind(contract_id)
        .fetch_optional(pool)
        .await
}

/// Get supervisor state by task ID.
pub async fn get_supervisor_state_by_task(
    pool: &PgPool,
    task_id: Uuid,
) -> Result<Option<SupervisorState>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>("SELECT * FROM supervisor_states WHERE task_id = $1")
        .bind(task_id)
        .fetch_optional(pool)
        .await
}

/// Update supervisor conversation history.
pub async fn update_supervisor_conversation(
    pool: &PgPool,
    contract_id: Uuid,
    conversation_history: serde_json::Value,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET conversation_history = $1,
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $2
        RETURNING *
        "#,
    )
    .bind(conversation_history)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Update supervisor pending tasks.
pub async fn update_supervisor_pending_tasks(
    pool: &PgPool,
    contract_id: Uuid,
    pending_task_ids: &[Uuid],
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET pending_task_ids = $1,
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $2
        RETURNING *
        "#,
    )
    .bind(pending_task_ids)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Update supervisor state with detailed activity tracking.
/// Called at key save points: LLM response, task spawn, question asked, phase change.
pub async fn update_supervisor_detailed_state(
    pool: &PgPool,
    contract_id: Uuid,
    state: &str,
    current_activity: Option<&str>,
    progress: i32,
    error_message: Option<&str>,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET state = $1,
            current_activity = $2,
            progress = $3,
            error_message = $4,
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $5
        RETURNING *
        "#,
    )
    .bind(state)
    .bind(current_activity)
    .bind(progress)
    .bind(error_message)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Add a spawned task ID to the supervisor's list.
pub async fn add_supervisor_spawned_task(
    pool: &PgPool,
    contract_id: Uuid,
    task_id: Uuid,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET spawned_task_ids = array_append(spawned_task_ids, $1),
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $2
        RETURNING *
        "#,
    )
    .bind(task_id)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Add a pending question to the supervisor state.
pub async fn add_supervisor_pending_question(
    pool: &PgPool,
    contract_id: Uuid,
    question: serde_json::Value,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET pending_questions = pending_questions || $1::jsonb,
            state = 'waiting_for_user',
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $2
        RETURNING *
        "#,
    )
    .bind(question)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Remove a pending question by ID.
pub async fn remove_supervisor_pending_question(
    pool: &PgPool,
    contract_id: Uuid,
    question_id: Uuid,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET pending_questions = (
            SELECT COALESCE(jsonb_agg(elem), '[]'::jsonb)
            FROM jsonb_array_elements(pending_questions) elem
            WHERE (elem->>'id')::uuid != $1
        ),
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $2
        RETURNING *
        "#,
    )
    .bind(question_id)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Comprehensive state save - used at major save points.
pub async fn save_supervisor_state_full(
    pool: &PgPool,
    contract_id: Uuid,
    task_id: Uuid,
    conversation_history: serde_json::Value,
    pending_task_ids: &[Uuid],
    phase: &str,
    state: &str,
    current_activity: Option<&str>,
    progress: i32,
    error_message: Option<&str>,
    spawned_task_ids: &[Uuid],
    pending_questions: serde_json::Value,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        INSERT INTO supervisor_states (
            contract_id, task_id, conversation_history, pending_task_ids, phase,
            state, current_activity, progress, error_message, spawned_task_ids,
            pending_questions, last_activity
        )
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, NOW())
        ON CONFLICT (contract_id) DO UPDATE SET
            task_id = EXCLUDED.task_id,
            conversation_history = EXCLUDED.conversation_history,
            pending_task_ids = EXCLUDED.pending_task_ids,
            phase = EXCLUDED.phase,
            state = EXCLUDED.state,
            current_activity = EXCLUDED.current_activity,
            progress = EXCLUDED.progress,
            error_message = EXCLUDED.error_message,
            spawned_task_ids = EXCLUDED.spawned_task_ids,
            pending_questions = EXCLUDED.pending_questions,
            last_activity = NOW(),
            updated_at = NOW()
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(task_id)
    .bind(conversation_history)
    .bind(pending_task_ids)
    .bind(phase)
    .bind(state)
    .bind(current_activity)
    .bind(progress)
    .bind(error_message)
    .bind(spawned_task_ids)
    .bind(pending_questions)
    .fetch_one(pool)
    .await
}

/// Mark supervisor as restored from a crash/interruption.
pub async fn mark_supervisor_restored(
    pool: &PgPool,
    contract_id: Uuid,
    restoration_source: &str,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET restoration_count = restoration_count + 1,
            last_restored_at = NOW(),
            restoration_source = $1,
            state = 'initializing',
            error_message = NULL,
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $2
        RETURNING *
        "#,
    )
    .bind(restoration_source)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Get supervisors with pending questions (for re-delivery after restoration).
pub async fn get_supervisors_with_pending_questions(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<Vec<SupervisorState>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        SELECT ss.*
        FROM supervisor_states ss
        JOIN contracts c ON c.id = ss.contract_id
        WHERE c.owner_id = $1
          AND ss.pending_questions != '[]'::jsonb
          AND c.status = 'active'
        ORDER BY ss.last_activity DESC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Get supervisor state with full details for restoration.
/// Includes validation info.
pub async fn get_supervisor_state_for_restoration(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Option<SupervisorState>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        SELECT * FROM supervisor_states WHERE contract_id = $1
        "#,
    )
    .bind(contract_id)
    .fetch_optional(pool)
    .await
}

/// Validate spawned tasks are in expected states.
/// Returns map of task_id -> (status, updated_at).
pub async fn validate_spawned_tasks(
    pool: &PgPool,
    task_ids: &[Uuid],
) -> Result<std::collections::HashMap<Uuid, (String, chrono::DateTime<Utc>)>, sqlx::Error> {
    use sqlx::Row;

    let rows = sqlx::query(
        r#"
        SELECT id, status, updated_at
        FROM tasks
        WHERE id = ANY($1)
        "#,
    )
    .bind(task_ids)
    .fetch_all(pool)
    .await?;

    let mut result = std::collections::HashMap::new();
    for row in rows {
        let id: Uuid = row.get("id");
        let status: String = row.get("status");
        let updated_at: chrono::DateTime<Utc> = row.get("updated_at");
        result.insert(id, (status, updated_at));
    }
    Ok(result)
}

/// Update supervisor state when phase changes.
pub async fn update_supervisor_phase(
    pool: &PgPool,
    contract_id: Uuid,
    new_phase: &str,
) -> Result<SupervisorState, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET phase = $1,
            state = 'working',
            current_activity = 'Phase changed to ' || $1,
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $2
        RETURNING *
        "#,
    )
    .bind(new_phase)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Update supervisor state on heartbeat (lightweight update).
pub async fn update_supervisor_heartbeat_state(
    pool: &PgPool,
    contract_id: Uuid,
    state: &str,
    current_activity: Option<&str>,
    progress: i32,
    pending_task_ids: &[Uuid],
) -> Result<(), sqlx::Error> {
    sqlx::query(
        r#"
        UPDATE supervisor_states
        SET state = $1,
            current_activity = $2,
            progress = $3,
            pending_task_ids = $4,
            last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $5
        "#,
    )
    .bind(state)
    .bind(current_activity)
    .bind(progress)
    .bind(pending_task_ids)
    .bind(contract_id)
    .execute(pool)
    .await?;
    Ok(())
}

// ============================================================================
// Supervisor Heartbeats
// ============================================================================

/// Record a supervisor heartbeat.
/// This creates a historical record for monitoring and dead supervisor detection.
pub async fn create_supervisor_heartbeat(
    pool: &PgPool,
    supervisor_task_id: Uuid,
    contract_id: Uuid,
    state: &str,
    phase: &str,
    current_activity: Option<&str>,
    progress: i32,
    pending_task_ids: &[Uuid],
) -> Result<SupervisorHeartbeatRecord, sqlx::Error> {
    sqlx::query_as::<_, SupervisorHeartbeatRecord>(
        r#"
        INSERT INTO supervisor_heartbeats (
            supervisor_task_id, contract_id, state, phase, current_activity, progress, pending_task_ids, timestamp
        )
        VALUES ($1, $2, $3, $4, $5, $6, $7, NOW())
        RETURNING *
        "#,
    )
    .bind(supervisor_task_id)
    .bind(contract_id)
    .bind(state)
    .bind(phase)
    .bind(current_activity)
    .bind(progress)
    .bind(pending_task_ids)
    .fetch_one(pool)
    .await
}

/// Get the latest heartbeat for a supervisor task.
pub async fn get_latest_supervisor_heartbeat(
    pool: &PgPool,
    supervisor_task_id: Uuid,
) -> Result<Option<SupervisorHeartbeatRecord>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorHeartbeatRecord>(
        r#"
        SELECT * FROM supervisor_heartbeats
        WHERE supervisor_task_id = $1
        ORDER BY timestamp DESC
        LIMIT 1
        "#,
    )
    .bind(supervisor_task_id)
    .fetch_optional(pool)
    .await
}

/// Get recent heartbeats for a supervisor task.
pub async fn get_supervisor_heartbeats(
    pool: &PgPool,
    supervisor_task_id: Uuid,
    limit: i64,
) -> Result<Vec<SupervisorHeartbeatRecord>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorHeartbeatRecord>(
        r#"
        SELECT * FROM supervisor_heartbeats
        WHERE supervisor_task_id = $1
        ORDER BY timestamp DESC
        LIMIT $2
        "#,
    )
    .bind(supervisor_task_id)
    .bind(limit)
    .fetch_all(pool)
    .await
}

/// Get recent heartbeats for a contract.
pub async fn get_contract_supervisor_heartbeats(
    pool: &PgPool,
    contract_id: Uuid,
    limit: i64,
) -> Result<Vec<SupervisorHeartbeatRecord>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorHeartbeatRecord>(
        r#"
        SELECT * FROM supervisor_heartbeats
        WHERE contract_id = $1
        ORDER BY timestamp DESC
        LIMIT $2
        "#,
    )
    .bind(contract_id)
    .bind(limit)
    .fetch_all(pool)
    .await
}

/// Delete old heartbeats beyond the TTL (24 hours by default).
/// Returns the number of deleted records.
pub async fn cleanup_old_heartbeats(
    pool: &PgPool,
    ttl_hours: i64,
) -> Result<u64, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM supervisor_heartbeats
        WHERE timestamp < NOW() - ($1 || ' hours')::INTERVAL
        "#,
    )
    .bind(ttl_hours.to_string())
    .execute(pool)
    .await?;

    Ok(result.rows_affected())
}

/// Find supervisors that have not sent a heartbeat within the timeout period.
/// Returns list of (supervisor_task_id, contract_id, last_heartbeat_timestamp).
pub async fn find_stale_supervisors(
    pool: &PgPool,
    timeout_seconds: i64,
) -> Result<Vec<(Uuid, Uuid, chrono::DateTime<Utc>)>, sqlx::Error> {
    let rows = sqlx::query(
        r#"
        WITH latest_heartbeats AS (
            SELECT DISTINCT ON (supervisor_task_id)
                supervisor_task_id,
                contract_id,
                timestamp
            FROM supervisor_heartbeats
            ORDER BY supervisor_task_id, timestamp DESC
        )
        SELECT
            lh.supervisor_task_id,
            lh.contract_id,
            lh.timestamp
        FROM latest_heartbeats lh
        JOIN tasks t ON t.id = lh.supervisor_task_id
        WHERE t.status = 'running'
          AND lh.timestamp < NOW() - ($1 || ' seconds')::INTERVAL
        "#,
    )
    .bind(timeout_seconds.to_string())
    .fetch_all(pool)
    .await?;

    let mut result = Vec::new();
    for row in rows {
        use sqlx::Row;
        let supervisor_task_id: Uuid = row.get("supervisor_task_id");
        let contract_id: Uuid = row.get("contract_id");
        let timestamp: chrono::DateTime<Utc> = row.get("timestamp");
        result.push((supervisor_task_id, contract_id, timestamp));
    }
    Ok(result)
}

// ============================================================================
// Contract Supervisor
// ============================================================================

/// Update contract's supervisor task ID.
pub async fn update_contract_supervisor(
    pool: &PgPool,
    contract_id: Uuid,
    supervisor_task_id: Uuid,
) -> Result<Contract, sqlx::Error> {
    sqlx::query_as::<_, Contract>(
        r#"
        UPDATE contracts
        SET supervisor_task_id = $1,
            updated_at = NOW()
        WHERE id = $2
        RETURNING *
        "#,
    )
    .bind(supervisor_task_id)
    .bind(contract_id)
    .fetch_one(pool)
    .await
}

/// Mark a deliverable as complete for a specific phase.
/// Uses JSONB operations to append the deliverable_id to the phase's array.
pub async fn mark_deliverable_complete(
    pool: &PgPool,
    contract_id: Uuid,
    phase: &str,
    deliverable_id: &str,
) -> Result<Contract, sqlx::Error> {
    // Use jsonb_set to add the deliverable to the phase's array
    // If the phase key doesn't exist, create an empty array first
    // COALESCE handles the case where the phase array doesn't exist yet
    sqlx::query_as::<_, Contract>(
        r#"
        UPDATE contracts
        SET completed_deliverables = jsonb_set(
            completed_deliverables,
            ARRAY[$2::text],
            COALESCE(completed_deliverables->$2, '[]'::jsonb) || to_jsonb($3::text),
            true
        ),
        updated_at = NOW()
        WHERE id = $1
        AND NOT (COALESCE(completed_deliverables->$2, '[]'::jsonb) ? $3)
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(phase)
    .bind(deliverable_id)
    .fetch_one(pool)
    .await
}

/// Clear all completed deliverables for a specific phase.
/// Used when phase changes or deliverables need to be reset.
pub async fn clear_phase_deliverables(
    pool: &PgPool,
    contract_id: Uuid,
    phase: &str,
) -> Result<Contract, sqlx::Error> {
    sqlx::query_as::<_, Contract>(
        r#"
        UPDATE contracts
        SET completed_deliverables = completed_deliverables - $2,
            updated_at = NOW()
        WHERE id = $1
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .bind(phase)
    .fetch_one(pool)
    .await
}

/// Get the supervisor task for a contract.
pub async fn get_contract_supervisor_task(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Option<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        SELECT t.* FROM tasks t
        JOIN contracts c ON c.supervisor_task_id = t.id
        WHERE c.id = $1
        "#,
    )
    .bind(contract_id)
    .fetch_optional(pool)
    .await
}

// ============================================================================
// Task Tree Queries
// ============================================================================

/// Get full task tree for a contract.
pub async fn get_contract_task_tree(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Vec<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        WITH RECURSIVE task_tree AS (
            -- Base case: root tasks (no parent)
            SELECT * FROM tasks
            WHERE contract_id = $1 AND parent_task_id IS NULL
            UNION ALL
            -- Recursive case: children of current level
            SELECT t.* FROM tasks t
            JOIN task_tree tt ON t.parent_task_id = tt.id
        )
        SELECT * FROM task_tree
        ORDER BY depth, created_at
        "#,
    )
    .bind(contract_id)
    .fetch_all(pool)
    .await
}

/// Get task tree from a specific root task.
pub async fn get_task_tree(pool: &PgPool, root_task_id: Uuid) -> Result<Vec<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        WITH RECURSIVE task_tree AS (
            -- Base case: the root task
            SELECT * FROM tasks WHERE id = $1
            UNION ALL
            -- Recursive case: children of current level
            SELECT t.* FROM tasks t
            JOIN task_tree tt ON t.parent_task_id = tt.id
        )
        SELECT * FROM task_tree
        ORDER BY depth, created_at
        "#,
    )
    .bind(root_task_id)
    .fetch_all(pool)
    .await
}

// ============================================================================
// Daemon Selection
// ============================================================================

/// Get daemons with capacity info for selection.
pub async fn get_available_daemons(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<Vec<DaemonWithCapacity>, sqlx::Error> {
    sqlx::query_as::<_, DaemonWithCapacity>(
        r#"
        SELECT id, owner_id, connection_id, hostname, machine_id,
               max_concurrent_tasks, current_task_count,
               capacity_score, task_queue_length, supports_migration,
               status, last_heartbeat_at, connected_at
        FROM daemons
        WHERE owner_id = $1 AND status = 'connected'
        ORDER BY
            COALESCE(capacity_score, 100) DESC,
            (max_concurrent_tasks - current_task_count) DESC,
            COALESCE(task_queue_length, 0) ASC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Get daemons with capacity info for selection, excluding specified daemon IDs.
/// Used for task retry to avoid reassigning to daemons that have already failed.
pub async fn get_available_daemons_excluding(
    pool: &PgPool,
    owner_id: Uuid,
    exclude_daemon_ids: &[Uuid],
) -> Result<Vec<DaemonWithCapacity>, sqlx::Error> {
    sqlx::query_as::<_, DaemonWithCapacity>(
        r#"
        SELECT id, owner_id, connection_id, hostname, machine_id,
               max_concurrent_tasks, current_task_count,
               capacity_score, task_queue_length, supports_migration,
               status, last_heartbeat_at, connected_at
        FROM daemons
        WHERE owner_id = $1
          AND status = 'connected'
          AND id != ALL($2)
        ORDER BY
            COALESCE(capacity_score, 100) DESC,
            (max_concurrent_tasks - current_task_count) DESC,
            COALESCE(task_queue_length, 0) ASC
        "#,
    )
    .bind(owner_id)
    .bind(exclude_daemon_ids)
    .fetch_all(pool)
    .await
}

/// Create a daemon task assignment.
pub async fn create_daemon_task_assignment(
    pool: &PgPool,
    daemon_id: Uuid,
    task_id: Uuid,
) -> Result<DaemonTaskAssignment, sqlx::Error> {
    sqlx::query_as::<_, DaemonTaskAssignment>(
        r#"
        INSERT INTO daemon_task_assignments (daemon_id, task_id)
        VALUES ($1, $2)
        RETURNING *
        "#,
    )
    .bind(daemon_id)
    .bind(task_id)
    .fetch_one(pool)
    .await
}

/// Update daemon task assignment status.
pub async fn update_daemon_task_assignment_status(
    pool: &PgPool,
    task_id: Uuid,
    status: &str,
) -> Result<DaemonTaskAssignment, sqlx::Error> {
    sqlx::query_as::<_, DaemonTaskAssignment>(
        r#"
        UPDATE daemon_task_assignments
        SET status = $1
        WHERE task_id = $2
        RETURNING *
        "#,
    )
    .bind(status)
    .bind(task_id)
    .fetch_one(pool)
    .await
}

/// Get daemon task assignment for a task.
pub async fn get_daemon_task_assignment(
    pool: &PgPool,
    task_id: Uuid,
) -> Result<Option<DaemonTaskAssignment>, sqlx::Error> {
    sqlx::query_as::<_, DaemonTaskAssignment>(
        "SELECT * FROM daemon_task_assignments WHERE task_id = $1",
    )
    .bind(task_id)
    .fetch_optional(pool)
    .await
}

// ============================================================================
// Repository History Functions
// ============================================================================

use super::models::RepositoryHistoryEntry;

/// List all repository history entries for an owner, ordered by use_count DESC, last_used_at DESC.
pub async fn list_repository_history_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<Vec<RepositoryHistoryEntry>, sqlx::Error> {
    sqlx::query_as::<_, RepositoryHistoryEntry>(
        r#"
        SELECT id, owner_id, name, repository_url, local_path, source_type, use_count, last_used_at, created_at
        FROM repository_history
        WHERE owner_id = $1
        ORDER BY use_count DESC, last_used_at DESC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Get repository suggestions for an owner, optionally filtered by source type and query.
pub async fn get_repository_suggestions(
    pool: &PgPool,
    owner_id: Uuid,
    source_type: Option<&str>,
    query: Option<&str>,
    limit: i32,
) -> Result<Vec<RepositoryHistoryEntry>, sqlx::Error> {
    // Build query dynamically based on filters
    let mut sql = String::from(
        r#"
        SELECT id, owner_id, name, repository_url, local_path, source_type, use_count, last_used_at, created_at
        FROM repository_history
        WHERE owner_id = $1
        "#,
    );

    let mut param_idx = 2;

    if source_type.is_some() {
        sql.push_str(&format!(" AND source_type = ${}", param_idx));
        param_idx += 1;
    }

    if query.is_some() {
        sql.push_str(&format!(
            " AND (LOWER(name) LIKE ${} OR LOWER(COALESCE(repository_url, '')) LIKE ${} OR LOWER(COALESCE(local_path, '')) LIKE ${})",
            param_idx, param_idx, param_idx
        ));
        param_idx += 1;
    }

    sql.push_str(&format!(
        " ORDER BY use_count DESC, last_used_at DESC LIMIT ${}",
        param_idx
    ));

    // Build and execute query with the appropriate bindings
    let mut query_builder = sqlx::query_as::<_, RepositoryHistoryEntry>(&sql).bind(owner_id);

    if let Some(st) = source_type {
        query_builder = query_builder.bind(st);
    }

    if let Some(q) = query {
        let search_pattern = format!("%{}%", q.to_lowercase());
        query_builder = query_builder.bind(search_pattern);
    }

    query_builder = query_builder.bind(limit);

    query_builder.fetch_all(pool).await
}

/// Add or update a repository history entry.
/// If an entry with the same URL (for remote) or path (for local) already exists,
/// increment use_count and update last_used_at and name.
/// Otherwise, create a new entry.
pub async fn add_or_update_repository_history(
    pool: &PgPool,
    owner_id: Uuid,
    name: &str,
    repository_url: Option<&str>,
    local_path: Option<&str>,
    source_type: &str,
) -> Result<RepositoryHistoryEntry, sqlx::Error> {
    // Use UPSERT (INSERT ... ON CONFLICT)
    if source_type == "remote" {
        let url = repository_url.ok_or_else(|| {
            sqlx::Error::Protocol("repository_url required for remote type".to_string())
        })?;

        sqlx::query_as::<_, RepositoryHistoryEntry>(
            r#"
            INSERT INTO repository_history (owner_id, name, repository_url, local_path, source_type, use_count, last_used_at)
            VALUES ($1, $2, $3, NULL, $4, 1, NOW())
            ON CONFLICT (owner_id, repository_url) WHERE source_type = 'remote' AND repository_url IS NOT NULL
            DO UPDATE SET
                name = EXCLUDED.name,
                use_count = repository_history.use_count + 1,
                last_used_at = NOW()
            RETURNING id, owner_id, name, repository_url, local_path, source_type, use_count, last_used_at, created_at
            "#,
        )
        .bind(owner_id)
        .bind(name)
        .bind(url)
        .bind(source_type)
        .fetch_one(pool)
        .await
    } else if source_type == "local" {
        let path = local_path.ok_or_else(|| {
            sqlx::Error::Protocol("local_path required for local type".to_string())
        })?;

        sqlx::query_as::<_, RepositoryHistoryEntry>(
            r#"
            INSERT INTO repository_history (owner_id, name, repository_url, local_path, source_type, use_count, last_used_at)
            VALUES ($1, $2, NULL, $3, $4, 1, NOW())
            ON CONFLICT (owner_id, local_path) WHERE source_type = 'local' AND local_path IS NOT NULL
            DO UPDATE SET
                name = EXCLUDED.name,
                use_count = repository_history.use_count + 1,
                last_used_at = NOW()
            RETURNING id, owner_id, name, repository_url, local_path, source_type, use_count, last_used_at, created_at
            "#,
        )
        .bind(owner_id)
        .bind(name)
        .bind(path)
        .bind(source_type)
        .fetch_one(pool)
        .await
    } else {
        Err(sqlx::Error::Protocol(format!(
            "Invalid source_type: {}",
            source_type
        )))
    }
}

/// Delete a repository history entry.
/// Returns true if an entry was deleted, false if not found.
pub async fn delete_repository_history(
    pool: &PgPool,
    id: Uuid,
    owner_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM repository_history
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

// ============================================================================
// Conversation Snapshots
// ============================================================================

/// Create a new conversation snapshot
pub async fn create_conversation_snapshot(
    pool: &PgPool,
    task_id: Uuid,
    checkpoint_id: Option<Uuid>,
    snapshot_type: &str,
    message_count: i32,
    conversation_state: serde_json::Value,
    metadata: Option<serde_json::Value>,
) -> Result<ConversationSnapshot, sqlx::Error> {
    sqlx::query_as::<_, ConversationSnapshot>(
        r#"
        INSERT INTO conversation_snapshots (task_id, checkpoint_id, snapshot_type, message_count, conversation_state, metadata)
        VALUES ($1, $2, $3, $4, $5, $6)
        RETURNING *
        "#
    )
    .bind(task_id)
    .bind(checkpoint_id)
    .bind(snapshot_type)
    .bind(message_count)
    .bind(conversation_state)
    .bind(metadata)
    .fetch_one(pool)
    .await
}

/// Get a conversation snapshot by ID
pub async fn get_conversation_snapshot(
    pool: &PgPool,
    id: Uuid,
) -> Result<Option<ConversationSnapshot>, sqlx::Error> {
    sqlx::query_as::<_, ConversationSnapshot>(
        "SELECT * FROM conversation_snapshots WHERE id = $1"
    )
    .bind(id)
    .fetch_optional(pool)
    .await
}

/// Get conversation snapshot at a specific checkpoint
pub async fn get_conversation_at_checkpoint(
    pool: &PgPool,
    checkpoint_id: Uuid,
) -> Result<Option<ConversationSnapshot>, sqlx::Error> {
    sqlx::query_as::<_, ConversationSnapshot>(
        "SELECT * FROM conversation_snapshots WHERE checkpoint_id = $1 ORDER BY created_at DESC LIMIT 1"
    )
    .bind(checkpoint_id)
    .fetch_optional(pool)
    .await
}

/// List conversation snapshots for a task
pub async fn list_conversation_snapshots(
    pool: &PgPool,
    task_id: Uuid,
    limit: Option<i32>,
) -> Result<Vec<ConversationSnapshot>, sqlx::Error> {
    let limit = limit.unwrap_or(100);
    sqlx::query_as::<_, ConversationSnapshot>(
        "SELECT * FROM conversation_snapshots WHERE task_id = $1 ORDER BY created_at DESC LIMIT $2"
    )
    .bind(task_id)
    .bind(limit)
    .fetch_all(pool)
    .await
}

/// Delete conversation snapshots older than retention period
pub async fn cleanup_old_snapshots(
    pool: &PgPool,
    retention_days: i32,
) -> Result<u64, sqlx::Error> {
    let result = sqlx::query(
        "DELETE FROM conversation_snapshots WHERE created_at < NOW() - INTERVAL '1 day' * $1"
    )
    .bind(retention_days)
    .execute(pool)
    .await?;
    Ok(result.rows_affected())
}

// ============================================================================
// History Events
// ============================================================================

/// Record a new history event
#[allow(clippy::too_many_arguments)]
pub async fn record_history_event(
    pool: &PgPool,
    owner_id: Uuid,
    contract_id: Option<Uuid>,
    task_id: Option<Uuid>,
    event_type: &str,
    event_subtype: Option<&str>,
    phase: Option<&str>,
    event_data: serde_json::Value,
) -> Result<HistoryEvent, sqlx::Error> {
    sqlx::query_as::<_, HistoryEvent>(
        r#"
        INSERT INTO history_events (owner_id, contract_id, task_id, event_type, event_subtype, phase, event_data)
        VALUES ($1, $2, $3, $4, $5, $6, $7)
        RETURNING *
        "#
    )
    .bind(owner_id)
    .bind(contract_id)
    .bind(task_id)
    .bind(event_type)
    .bind(event_subtype)
    .bind(phase)
    .bind(event_data)
    .fetch_one(pool)
    .await
}

/// Get contract history timeline
pub async fn get_contract_history(
    pool: &PgPool,
    contract_id: Uuid,
    owner_id: Uuid,
    filters: &HistoryQueryFilters,
) -> Result<(Vec<HistoryEvent>, i64), sqlx::Error> {
    let limit = filters.limit.unwrap_or(100);

    let mut query = String::from(
        "SELECT * FROM history_events WHERE contract_id = $1 AND owner_id = $2"
    );
    let mut count_query = String::from(
        "SELECT COUNT(*) FROM history_events WHERE contract_id = $1 AND owner_id = $2"
    );

    let mut param_count = 2;

    if filters.phase.is_some() {
        param_count += 1;
        query.push_str(&format!(" AND phase = ${}" , param_count));
        count_query.push_str(&format!(" AND phase = ${}", param_count));
    }

    if filters.from.is_some() {
        param_count += 1;
        query.push_str(&format!(" AND created_at >= ${}", param_count));
        count_query.push_str(&format!(" AND created_at >= ${}", param_count));
    }

    if filters.to.is_some() {
        param_count += 1;
        query.push_str(&format!(" AND created_at <= ${}", param_count));
        count_query.push_str(&format!(" AND created_at <= ${}", param_count));
    }

    query.push_str(" ORDER BY created_at DESC");
    query.push_str(&format!(" LIMIT {}", limit));

    // Build and execute the query dynamically
    let mut q = sqlx::query_as::<_, HistoryEvent>(&query)
        .bind(contract_id)
        .bind(owner_id);

    if let Some(ref phase) = filters.phase {
        q = q.bind(phase);
    }
    if let Some(ref from) = filters.from {
        q = q.bind(from);
    }
    if let Some(ref to) = filters.to {
        q = q.bind(to);
    }

    let events = q.fetch_all(pool).await?;

    // Get total count
    let mut cq = sqlx::query_scalar::<_, i64>(&count_query)
        .bind(contract_id)
        .bind(owner_id);

    if let Some(ref phase) = filters.phase {
        cq = cq.bind(phase);
    }
    if let Some(ref from) = filters.from {
        cq = cq.bind(from);
    }
    if let Some(ref to) = filters.to {
        cq = cq.bind(to);
    }

    let count = cq.fetch_one(pool).await?;

    Ok((events, count))
}

/// Get task history
pub async fn get_task_history(
    pool: &PgPool,
    task_id: Uuid,
    owner_id: Uuid,
    filters: &HistoryQueryFilters,
) -> Result<(Vec<HistoryEvent>, i64), sqlx::Error> {
    let limit = filters.limit.unwrap_or(100);

    let events = sqlx::query_as::<_, HistoryEvent>(
        r#"
        SELECT * FROM history_events
        WHERE task_id = $1 AND owner_id = $2
        ORDER BY created_at DESC
        LIMIT $3
        "#
    )
    .bind(task_id)
    .bind(owner_id)
    .bind(limit)
    .fetch_all(pool)
    .await?;

    let count: i64 = sqlx::query_scalar(
        "SELECT COUNT(*) FROM history_events WHERE task_id = $1 AND owner_id = $2"
    )
    .bind(task_id)
    .bind(owner_id)
    .fetch_one(pool)
    .await?;

    Ok((events, count))
}

/// Get unified timeline for an owner
pub async fn get_timeline(
    pool: &PgPool,
    owner_id: Uuid,
    filters: &HistoryQueryFilters,
) -> Result<(Vec<HistoryEvent>, i64), sqlx::Error> {
    let limit = filters.limit.unwrap_or(100);

    let events = sqlx::query_as::<_, HistoryEvent>(
        r#"
        SELECT * FROM history_events
        WHERE owner_id = $1
        ORDER BY created_at DESC
        LIMIT $2
        "#
    )
    .bind(owner_id)
    .bind(limit)
    .fetch_all(pool)
    .await?;

    let count: i64 = sqlx::query_scalar(
        "SELECT COUNT(*) FROM history_events WHERE owner_id = $1"
    )
    .bind(owner_id)
    .fetch_one(pool)
    .await?;

    Ok((events, count))
}

// ============================================================================
// Task Conversation Retrieval
// ============================================================================

// Helper struct for parsing task output events
#[derive(Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
struct TaskOutputEvent {
    message_type: String,
    content: Option<String>,
    tool_name: Option<String>,
    tool_input: Option<serde_json::Value>,
    is_error: Option<bool>,
    cost_usd: Option<f32>,
}

/// Get task conversation messages (reconstructed from task_events)
pub async fn get_task_conversation(
    pool: &PgPool,
    task_id: Uuid,
    include_tool_calls: bool,
    include_tool_results: bool,
    limit: Option<i32>,
) -> Result<Vec<ConversationMessage>, sqlx::Error> {
    let limit = limit.unwrap_or(1000);

    // Get output events that represent conversation turns
    let events = sqlx::query_as::<_, TaskEvent>(
        r#"
        SELECT * FROM task_events
        WHERE task_id = $1 AND event_type = 'output'
        ORDER BY created_at ASC
        LIMIT $2
        "#
    )
    .bind(task_id)
    .bind(limit)
    .fetch_all(pool)
    .await?;

    // Convert task events to conversation messages
    let mut messages = Vec::new();
    for event in events {
        if let Some(data) = event.event_data {
            // Parse the event data to extract message info
            if let Ok(output) = serde_json::from_value::<TaskOutputEvent>(data.clone()) {
                let should_include = match output.message_type.as_str() {
                    "tool_use" => include_tool_calls,
                    "tool_result" => include_tool_results,
                    _ => true,
                };

                if should_include {
                    messages.push(ConversationMessage {
                        id: event.id.to_string(),
                        role: match output.message_type.as_str() {
                            "assistant" => "assistant".to_string(),
                            "tool_use" => "assistant".to_string(),
                            "tool_result" => "tool".to_string(),
                            "system" => "system".to_string(),
                            "error" => "system".to_string(),
                            _ => "user".to_string(),
                        },
                        content: output.content.unwrap_or_default(),
                        timestamp: event.created_at,
                        tool_calls: None,
                        tool_name: output.tool_name,
                        tool_input: output.tool_input,
                        tool_result: None,
                        is_error: output.is_error,
                        token_count: None,
                        cost_usd: output.cost_usd.map(|c| c as f64),
                    });
                }
            }
        }
    }

    Ok(messages)
}

/// Get supervisor conversation (from supervisor_states)
pub async fn get_supervisor_conversation_full(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Option<SupervisorState>, sqlx::Error> {
    get_supervisor_state(pool, contract_id).await
}

// =============================================================================
// Anonymous Task Cleanup Functions
// =============================================================================

/// Delete stale anonymous tasks (tasks with contract_id = NULL) that:
/// - Are in a terminal state (done, failed, merged)
/// - Are older than the specified number of days
///
/// Returns the number of deleted tasks.
pub async fn cleanup_stale_anonymous_tasks(
    pool: &PgPool,
    max_age_days: i32,
) -> Result<i64, sqlx::Error> {
    let result = sqlx::query(
        r#"
        DELETE FROM tasks
        WHERE contract_id IS NULL
          AND status IN ('done', 'failed', 'merged')
          AND created_at < NOW() - INTERVAL '1 day' * $1
        "#,
    )
    .bind(max_age_days)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() as i64)
}

// ============================================================================
// Checkpoint Patches (for task recovery)
// ============================================================================

/// Create a checkpoint patch for task recovery.
pub async fn create_checkpoint_patch(
    pool: &PgPool,
    task_id: Uuid,
    checkpoint_id: Option<Uuid>,
    base_commit_sha: &str,
    patch_data: &[u8],
    files_count: i32,
    ttl_hours: i64,
) -> Result<CheckpointPatch, sqlx::Error> {
    sqlx::query_as::<_, CheckpointPatch>(
        r#"
        INSERT INTO checkpoint_patches (
            task_id, checkpoint_id, base_commit_sha, patch_data,
            patch_size_bytes, files_count, expires_at
        )
        VALUES ($1, $2, $3, $4, $5, $6, NOW() + INTERVAL '1 hour' * $7)
        RETURNING *
        "#,
    )
    .bind(task_id)
    .bind(checkpoint_id)
    .bind(base_commit_sha)
    .bind(patch_data)
    .bind(patch_data.len() as i32)
    .bind(files_count)
    .bind(ttl_hours)
    .fetch_one(pool)
    .await
}

/// Get the latest checkpoint patch for a task.
pub async fn get_latest_checkpoint_patch(
    pool: &PgPool,
    task_id: Uuid,
) -> Result<Option<CheckpointPatch>, sqlx::Error> {
    sqlx::query_as::<_, CheckpointPatch>(
        r#"
        SELECT * FROM checkpoint_patches
        WHERE task_id = $1 AND expires_at > NOW()
        ORDER BY created_at DESC
        LIMIT 1
        "#,
    )
    .bind(task_id)
    .fetch_optional(pool)
    .await
}

/// Get a checkpoint patch by ID.
pub async fn get_checkpoint_patch(
    pool: &PgPool,
    id: Uuid,
) -> Result<Option<CheckpointPatch>, sqlx::Error> {
    sqlx::query_as::<_, CheckpointPatch>(
        "SELECT * FROM checkpoint_patches WHERE id = $1",
    )
    .bind(id)
    .fetch_optional(pool)
    .await
}

/// List all checkpoint patches for a task (without patch data for efficiency).
pub async fn list_checkpoint_patches(
    pool: &PgPool,
    task_id: Uuid,
) -> Result<Vec<CheckpointPatchInfo>, sqlx::Error> {
    sqlx::query_as::<_, CheckpointPatchInfo>(
        r#"
        SELECT id, task_id, checkpoint_id, base_commit_sha,
               patch_size_bytes, files_count, created_at, expires_at
        FROM checkpoint_patches
        WHERE task_id = $1
        ORDER BY created_at DESC
        "#,
    )
    .bind(task_id)
    .fetch_all(pool)
    .await
}

/// Delete expired checkpoint patches.
/// Returns the number of deleted patches.
pub async fn cleanup_expired_checkpoint_patches(
    pool: &PgPool,
) -> Result<i64, sqlx::Error> {
    let result = sqlx::query("DELETE FROM checkpoint_patches WHERE expires_at < NOW()")
        .execute(pool)
        .await?;
    Ok(result.rows_affected() as i64)
}

/// Delete all checkpoint patches for a task.
pub async fn delete_checkpoint_patches_for_task(
    pool: &PgPool,
    task_id: Uuid,
) -> Result<i64, sqlx::Error> {
    let result = sqlx::query("DELETE FROM checkpoint_patches WHERE task_id = $1")
        .bind(task_id)
        .execute(pool)
        .await?;
    Ok(result.rows_affected() as i64)
}

// =============================================================================
// Red Team Notifications
// =============================================================================
// =============================================================================
// Supervisor Status API Helpers
// =============================================================================

/// Get supervisor status for a contract.
/// Returns combined information from supervisor_states and tasks tables.
pub async fn get_supervisor_status(
    pool: &PgPool,
    contract_id: Uuid,
    owner_id: Uuid,
) -> Result<Option<SupervisorStatusInfo>, sqlx::Error> {
    // Query to get supervisor status by joining supervisor_states with tasks
    sqlx::query_as::<_, SupervisorStatusInfo>(
        r#"
        SELECT
            ss.task_id,
            COALESCE(t.status, 'unknown') as supervisor_state,
            ss.phase,
            t.progress_summary as current_activity,
            ss.pending_task_ids,
            ss.last_activity as last_heartbeat,
            t.status as task_status,
            t.daemon_id IS NOT NULL as is_running
        FROM supervisor_states ss
        JOIN tasks t ON t.id = ss.task_id
        WHERE ss.contract_id = $1
          AND t.owner_id = $2
        "#,
    )
    .bind(contract_id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// Internal struct to hold supervisor status query result
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct SupervisorStatusInfo {
    pub task_id: Uuid,
    pub supervisor_state: String,
    pub phase: String,
    pub current_activity: Option<String>,
    #[sqlx(try_from = "Vec<Uuid>")]
    pub pending_task_ids: Vec<Uuid>,
    pub last_heartbeat: chrono::DateTime<chrono::Utc>,
    pub task_status: String,
    pub is_running: bool,
}

/// Get supervisor activity history from history_events table.
/// This provides a timeline of supervisor activities that can serve as "heartbeats".
pub async fn get_supervisor_activity_history(
    pool: &PgPool,
    contract_id: Uuid,
    limit: i32,
    offset: i32,
) -> Result<Vec<SupervisorActivityEntry>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorActivityEntry>(
        r#"
        SELECT
            created_at as timestamp,
            COALESCE(event_subtype, 'activity') as state,
            event_data->>'activity' as activity,
            (event_data->>'progress')::INTEGER as progress,
            COALESCE(phase, 'unknown') as phase,
            CASE
                WHEN event_data->'pending_task_ids' IS NOT NULL
                THEN ARRAY(SELECT jsonb_array_elements_text(event_data->'pending_task_ids'))::UUID[]
                ELSE ARRAY[]::UUID[]
            END as pending_task_ids
        FROM history_events
        WHERE contract_id = $1
          AND event_type IN ('supervisor', 'phase', 'task')
        ORDER BY created_at DESC
        LIMIT $2 OFFSET $3
        "#,
    )
    .bind(contract_id)
    .bind(limit)
    .bind(offset)
    .fetch_all(pool)
    .await
}

/// Internal struct to hold supervisor activity entry
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct SupervisorActivityEntry {
    pub timestamp: chrono::DateTime<chrono::Utc>,
    pub state: String,
    pub activity: Option<String>,
    pub progress: Option<i32>,
    pub phase: String,
    #[sqlx(try_from = "Vec<Uuid>")]
    pub pending_task_ids: Vec<Uuid>,
}

/// Count total supervisor activity history entries for a contract.
pub async fn count_supervisor_activity_history(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<i64, sqlx::Error> {
    let result: (i64,) = sqlx::query_as(
        r#"
        SELECT COUNT(*)
        FROM history_events
        WHERE contract_id = $1
          AND event_type IN ('supervisor', 'phase', 'task')
        "#,
    )
    .bind(contract_id)
    .fetch_one(pool)
    .await?;
    Ok(result.0)
}

/// Update supervisor state last_activity timestamp.
/// This acts as a "sync" operation to refresh the supervisor's heartbeat.
pub async fn sync_supervisor_state(
    pool: &PgPool,
    contract_id: Uuid,
) -> Result<Option<SupervisorState>, sqlx::Error> {
    sqlx::query_as::<_, SupervisorState>(
        r#"
        UPDATE supervisor_states
        SET last_activity = NOW(),
            updated_at = NOW()
        WHERE contract_id = $1
        RETURNING *
        "#,
    )
    .bind(contract_id)
    .fetch_optional(pool)
    .await
}

// =============================================================================
// Helper Functions
// =============================================================================

/// Helper to truncate string to max length
fn truncate_string(s: &str, max_len: usize) -> String {
    if s.len() <= max_len {
        s.to_string()
    } else {
        format!("{}...", &s[..max_len - 3])
    }
}

// =============================================================================
// Directive CRUD
// =============================================================================

/// Create a new directive for an owner.
pub async fn create_directive_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    req: CreateDirectiveRequest,
) -> Result<Directive, sqlx::Error> {
    sqlx::query_as::<_, Directive>(
        r#"
        INSERT INTO directives (owner_id, title, goal, repository_url, local_path, base_branch, reconcile_mode)
        VALUES ($1, $2, $3, $4, $5, $6, $7)
        RETURNING *
        "#,
    )
    .bind(owner_id)
    .bind(&req.title)
    .bind(&req.goal)
    .bind(&req.repository_url)
    .bind(&req.local_path)
    .bind(&req.base_branch)
    .bind(req.reconcile_mode.unwrap_or(false))
    .fetch_one(pool)
    .await
}

/// Get a single directive for an owner.
pub async fn get_directive_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    id: Uuid,
) -> Result<Option<Directive>, sqlx::Error> {
    sqlx::query_as::<_, Directive>(
        r#"SELECT * FROM directives WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// Get a directive with all its steps.
pub async fn get_directive_with_steps_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    id: Uuid,
) -> Result<Option<(Directive, Vec<DirectiveStep>)>, sqlx::Error> {
    let directive = sqlx::query_as::<_, Directive>(
        r#"SELECT * FROM directives WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await?;

    match directive {
        Some(d) => {
            let steps = list_directive_steps(pool, d.id).await?;
            Ok(Some((d, steps)))
        }
        None => Ok(None),
    }
}

/// List all directives for an owner with step counts.
pub async fn list_directives_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
) -> Result<Vec<DirectiveSummary>, sqlx::Error> {
    sqlx::query_as::<_, DirectiveSummary>(
        r#"
        SELECT
            d.id, d.owner_id, d.title, d.goal, d.status, d.repository_url,
            d.orchestrator_task_id, d.pr_url, d.completion_task_id,
            d.reconcile_mode,
            d.version, d.created_at, d.updated_at,
            COALESCE(s.total_steps, 0) as total_steps,
            COALESCE(s.completed_steps, 0) as completed_steps,
            COALESCE(s.running_steps, 0) as running_steps,
            COALESCE(s.failed_steps, 0) as failed_steps
        FROM directives d
        LEFT JOIN LATERAL (
            SELECT
                COUNT(*) as total_steps,
                COUNT(*) FILTER (WHERE status = 'completed') as completed_steps,
                COUNT(*) FILTER (WHERE status = 'running') as running_steps,
                COUNT(*) FILTER (WHERE status = 'failed') as failed_steps
            FROM directive_steps
            WHERE directive_id = d.id
        ) s ON true
        WHERE d.owner_id = $1
        ORDER BY d.created_at DESC
        "#,
    )
    .bind(owner_id)
    .fetch_all(pool)
    .await
}

/// Update a directive with optimistic locking.
pub async fn update_directive_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    id: Uuid,
    req: UpdateDirectiveRequest,
) -> Result<Option<Directive>, RepositoryError> {
    let current = sqlx::query_as::<_, Directive>(
        r#"SELECT * FROM directives WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
    .map_err(RepositoryError::Database)?;

    let current = match current {
        Some(c) => c,
        None => return Ok(None),
    };

    if let Some(expected_version) = req.version {
        if expected_version != current.version {
            return Err(RepositoryError::VersionConflict {
                expected: expected_version,
                actual: current.version,
            });
        }
    }

    let title = req.title.as_deref().unwrap_or(&current.title);
    let goal = req.goal.as_deref().unwrap_or(&current.goal);
    let status = req.status.as_deref().unwrap_or(&current.status);
    let repository_url = req.repository_url.as_deref().or(current.repository_url.as_deref());
    let local_path = req.local_path.as_deref().or(current.local_path.as_deref());
    let base_branch = req.base_branch.as_deref().or(current.base_branch.as_deref());
    let orchestrator_task_id = req.orchestrator_task_id.or(current.orchestrator_task_id);
    let pr_url = req.pr_url.as_deref().or(current.pr_url.as_deref());
    let pr_branch = req.pr_branch.as_deref().or(current.pr_branch.as_deref());
    let reconcile_mode = req.reconcile_mode.unwrap_or(current.reconcile_mode);

    let result = sqlx::query_as::<_, Directive>(
        r#"
        UPDATE directives
        SET title = $3, goal = $4, status = $5, repository_url = $6, local_path = $7,
            base_branch = $8, orchestrator_task_id = $9, pr_url = $10, pr_branch = $11,
            reconcile_mode = $12,
            version = version + 1, updated_at = NOW()
        WHERE id = $1 AND owner_id = $2
        RETURNING *
        "#,
    )
    .bind(id)
    .bind(owner_id)
    .bind(title)
    .bind(goal)
    .bind(status)
    .bind(repository_url)
    .bind(local_path)
    .bind(base_branch)
    .bind(orchestrator_task_id)
    .bind(pr_url)
    .bind(pr_branch)
    .bind(reconcile_mode)
    .fetch_optional(pool)
    .await
    .map_err(RepositoryError::Database)?;

    Ok(result)
}

/// Delete a directive for an owner.
pub async fn delete_directive_for_owner(
    pool: &PgPool,
    owner_id: Uuid,
    id: Uuid,
) -> Result<bool, sqlx::Error> {
    // Delete all tasks associated with this directive
    sqlx::query(
        r#"DELETE FROM tasks WHERE directive_id = $1 AND owner_id = $2"#,
    )
    .bind(id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    let result = sqlx::query(
        r#"DELETE FROM directives WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Clean up terminal tasks associated with a directive.
///
/// Deletes tasks in terminal states (completed, failed, merged, done, interrupted)
/// that belong to this directive, excluding tasks currently referenced by
/// `completion_task_id` or `orchestrator_task_id` on the directive.
/// NULLs out `task_id` on directive_steps for deleted tasks.
pub async fn cleanup_directive_tasks(
    pool: &PgPool,
    owner_id: Uuid,
    directive_id: Uuid,
) -> Result<i64, sqlx::Error> {
    // NULL out task_id on steps that reference terminal tasks we're about to delete
    sqlx::query(
        r#"
        UPDATE directive_steps
        SET task_id = NULL
        WHERE directive_id = $1
          AND task_id IS NOT NULL
          AND task_id IN (
            SELECT t.id FROM tasks t
            WHERE t.directive_id = $1
              AND t.owner_id = $2
              AND t.status IN ('completed', 'failed', 'merged', 'done', 'interrupted')
              AND t.id NOT IN (
                SELECT COALESCE(d.completion_task_id, '00000000-0000-0000-0000-000000000000')
                FROM directives d WHERE d.id = $1
                UNION
                SELECT COALESCE(d.orchestrator_task_id, '00000000-0000-0000-0000-000000000000')
                FROM directives d WHERE d.id = $1
              )
          )
        "#,
    )
    .bind(directive_id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    // Delete terminal tasks not currently referenced by the directive
    let result = sqlx::query(
        r#"
        DELETE FROM tasks
        WHERE directive_id = $1
          AND owner_id = $2
          AND status IN ('completed', 'failed', 'merged', 'done', 'interrupted')
          AND id NOT IN (
            SELECT COALESCE(d.completion_task_id, '00000000-0000-0000-0000-000000000000')
            FROM directives d WHERE d.id = $1
            UNION
            SELECT COALESCE(d.orchestrator_task_id, '00000000-0000-0000-0000-000000000000')
            FROM directives d WHERE d.id = $1
          )
        "#,
    )
    .bind(directive_id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() as i64)
}

// =============================================================================
// Directive Completion Helpers
// =============================================================================

/// Row type for completed step tasks.
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct CompletedStepTask {
    pub step_name: String,
    pub task_id: Uuid,
    pub task_name: String,
}

/// Row type for directive completion task status check.
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct DirectiveCompletionCheck {
    pub directive_id: Uuid,
    pub owner_id: Uuid,
    pub completion_task_id: Uuid,
    pub task_status: String,
    pub pr_url: Option<String>,
}

/// Get idle directives that need a completion task spawned.
/// Conditions: status = 'idle', no completion_task_id, has repository_url,
/// and has at least one completed step with a task_id.
pub async fn get_idle_directives_needing_completion(
    pool: &PgPool,
) -> Result<Vec<Directive>, sqlx::Error> {
    sqlx::query_as::<_, Directive>(
        r#"
        SELECT d.*
        FROM directives d
        WHERE d.status = 'idle'
          AND d.completion_task_id IS NULL
          AND d.repository_url IS NOT NULL
          AND EXISTS (
              SELECT 1 FROM directive_steps ds
              WHERE ds.directive_id = d.id
                AND ds.status = 'completed'
                AND ds.task_id IS NOT NULL
          )
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Get directives with active completion tasks, joined with task status.
pub async fn get_completion_tasks_to_check(
    pool: &PgPool,
) -> Result<Vec<DirectiveCompletionCheck>, sqlx::Error> {
    sqlx::query_as::<_, DirectiveCompletionCheck>(
        r#"
        SELECT d.id as directive_id, d.owner_id, d.completion_task_id, t.status as task_status, d.pr_url
        FROM directives d
        JOIN tasks t ON t.id = d.completion_task_id
        WHERE d.completion_task_id IS NOT NULL
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Atomically claim a directive for completion by setting a placeholder completion_task_id.
/// Returns true if the claim was successful (no other task already claimed it).
pub async fn claim_directive_for_completion(
    pool: &PgPool,
    directive_id: Uuid,
    task_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"UPDATE directives SET completion_task_id = $2, updated_at = NOW()
           WHERE id = $1 AND completion_task_id IS NULL"#,
    )
    .bind(directive_id)
    .bind(task_id)
    .execute(pool)
    .await?;
    Ok(result.rows_affected() > 0)
}

/// Assign a completion task to a directive (unconditional update).
pub async fn assign_completion_task(
    pool: &PgPool,
    directive_id: Uuid,
    task_id: Uuid,
) -> Result<(), sqlx::Error> {
    sqlx::query(
        r#"UPDATE directives SET completion_task_id = $2, updated_at = NOW() WHERE id = $1"#,
    )
    .bind(directive_id)
    .bind(task_id)
    .execute(pool)
    .await?;
    Ok(())
}

/// Clear the completion task from a directive.
pub async fn clear_completion_task(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<(), sqlx::Error> {
    sqlx::query(
        r#"UPDATE directives SET completion_task_id = NULL, updated_at = NOW() WHERE id = $1"#,
    )
    .bind(directive_id)
    .execute(pool)
    .await?;
    Ok(())
}

/// Get completed step tasks for a directive (steps that have completed with an assigned task).
pub async fn get_completed_step_tasks(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<Vec<CompletedStepTask>, sqlx::Error> {
    sqlx::query_as::<_, CompletedStepTask>(
        r#"
        SELECT ds.name as step_name, ds.task_id, t.name as task_name
        FROM directive_steps ds
        JOIN tasks t ON t.id = ds.task_id
        WHERE ds.directive_id = $1
          AND ds.status = 'completed'
          AND ds.task_id IS NOT NULL
        ORDER BY ds.order_index, ds.created_at
        "#,
    )
    .bind(directive_id)
    .fetch_all(pool)
    .await
}

/// Get the task ID of the most recently completed step for a directive.
/// Used as a fallback `continue_from_task_id` when dispatching new-generation steps
/// that have no explicit dependencies and no PR branch to continue from.
pub async fn get_last_completed_step_task_id(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<Option<Uuid>, sqlx::Error> {
    let row: Option<(Uuid,)> = sqlx::query_as(
        r#"
        SELECT ds.task_id
        FROM directive_steps ds
        WHERE ds.directive_id = $1
          AND ds.status = 'completed'
          AND ds.task_id IS NOT NULL
        ORDER BY ds.updated_at DESC
        LIMIT 1
        "#,
    )
    .bind(directive_id)
    .fetch_optional(pool)
    .await?;
    Ok(row.map(|r| r.0))
}

// =============================================================================
// Directive Step CRUD
// =============================================================================

/// List all steps for a directive, ordered by order_index.
pub async fn list_directive_steps(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<Vec<DirectiveStep>, sqlx::Error> {
    sqlx::query_as::<_, DirectiveStep>(
        r#"
        SELECT * FROM directive_steps
        WHERE directive_id = $1
        ORDER BY order_index, created_at
        "#,
    )
    .bind(directive_id)
    .fetch_all(pool)
    .await
}

/// Create a single directive step.
pub async fn create_directive_step(
    pool: &PgPool,
    directive_id: Uuid,
    req: CreateDirectiveStepRequest,
) -> Result<DirectiveStep, sqlx::Error> {
    let generation = req.generation.unwrap_or(1);
    sqlx::query_as::<_, DirectiveStep>(
        r#"
        INSERT INTO directive_steps (directive_id, name, description, task_plan, depends_on, order_index, generation)
        VALUES ($1, $2, $3, $4, $5, $6, $7)
        RETURNING *
        "#,
    )
    .bind(directive_id)
    .bind(&req.name)
    .bind(&req.description)
    .bind(&req.task_plan)
    .bind(&req.depends_on)
    .bind(req.order_index)
    .bind(generation)
    .fetch_one(pool)
    .await
}

/// Batch create multiple directive steps.
pub async fn batch_create_directive_steps(
    pool: &PgPool,
    directive_id: Uuid,
    steps: Vec<CreateDirectiveStepRequest>,
) -> Result<Vec<DirectiveStep>, sqlx::Error> {
    let mut results = Vec::with_capacity(steps.len());
    for req in steps {
        let step = create_directive_step(pool, directive_id, req).await?;
        results.push(step);
    }
    Ok(results)
}

/// Update a directive step.
pub async fn update_directive_step(
    pool: &PgPool,
    step_id: Uuid,
    req: UpdateDirectiveStepRequest,
) -> Result<Option<DirectiveStep>, sqlx::Error> {
    let current = sqlx::query_as::<_, DirectiveStep>(
        r#"SELECT * FROM directive_steps WHERE id = $1"#,
    )
    .bind(step_id)
    .fetch_optional(pool)
    .await?;

    let current = match current {
        Some(c) => c,
        None => return Ok(None),
    };

    let name = req.name.as_deref().unwrap_or(&current.name);
    let description = req.description.as_deref().or(current.description.as_deref());
    let task_plan = req.task_plan.as_deref().or(current.task_plan.as_deref());
    let depends_on = req.depends_on.as_deref().unwrap_or(&current.depends_on);
    let status = req.status.as_deref().unwrap_or(&current.status);
    let task_id = req.task_id.or(current.task_id);
    let order_index = req.order_index.unwrap_or(current.order_index);

    // Set started_at when transitioning to running
    let started_at = if status == "running" && current.status != "running" {
        Some(Utc::now())
    } else {
        current.started_at
    };

    // Set completed_at when transitioning to terminal state
    let completed_at = if matches!(status, "completed" | "failed" | "skipped")
        && !matches!(current.status.as_str(), "completed" | "failed" | "skipped")
    {
        Some(Utc::now())
    } else {
        current.completed_at
    };

    sqlx::query_as::<_, DirectiveStep>(
        r#"
        UPDATE directive_steps
        SET name = $2, description = $3, task_plan = $4, depends_on = $5,
            status = $6, task_id = $7, order_index = $8, started_at = $9, completed_at = $10
        WHERE id = $1
        RETURNING *
        "#,
    )
    .bind(step_id)
    .bind(name)
    .bind(description)
    .bind(task_plan)
    .bind(depends_on)
    .bind(status)
    .bind(task_id)
    .bind(order_index)
    .bind(started_at)
    .bind(completed_at)
    .fetch_optional(pool)
    .await
}

/// Delete a directive step.
pub async fn delete_directive_step(
    pool: &PgPool,
    step_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(r#"DELETE FROM directive_steps WHERE id = $1"#)
        .bind(step_id)
        .execute(pool)
        .await?;

    Ok(result.rows_affected() > 0)
}

/// Delete all directive steps that have not started execution (pending, ready, failed, skipped).
/// Completed and running steps are preserved.
/// Returns the number of deleted steps.
pub async fn clear_pending_directive_steps(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<u64, sqlx::Error> {
    let result = sqlx::query(
        r#"DELETE FROM directive_steps
           WHERE directive_id = $1
             AND status IN ('pending', 'ready', 'failed', 'skipped')"#,
    )
    .bind(directive_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected())
}

// =============================================================================
// Directive DAG Progression
// =============================================================================

/// Advance pending steps to ready if all their dependencies are in terminal states.
/// Returns the newly-ready steps.
pub async fn advance_directive_ready_steps(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<Vec<DirectiveStep>, sqlx::Error> {
    sqlx::query_as::<_, DirectiveStep>(
        r#"
        UPDATE directive_steps SET status = 'ready'
        WHERE directive_id = $1 AND status = 'pending'
          AND NOT EXISTS (
            SELECT 1 FROM unnest(depends_on) AS dep_id
            JOIN directive_steps ds ON ds.id = dep_id
            WHERE ds.status NOT IN ('completed', 'skipped')
          )
          AND NOT EXISTS (
            SELECT 1 FROM directive_steps prev
            WHERE prev.directive_id = $1
              AND prev.order_index < directive_steps.order_index
              AND prev.status NOT IN ('completed', 'skipped', 'failed')
          )
        RETURNING *
        "#,
    )
    .bind(directive_id)
    .fetch_all(pool)
    .await
}

/// Check if all steps in a directive are in terminal states.
/// If so, set the directive to 'idle' (not completed — directives are ongoing).
/// Returns true if the directive was set to idle.
pub async fn check_directive_idle(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"
        UPDATE directives SET status = 'idle', updated_at = NOW()
        WHERE id = $1 AND status = 'active'
          AND NOT EXISTS (
            SELECT 1 FROM directive_steps
            WHERE directive_id = $1
              AND status NOT IN ('completed', 'failed', 'skipped')
          )
          AND EXISTS (
            SELECT 1 FROM directive_steps WHERE directive_id = $1
          )
        "#,
    )
    .bind(directive_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Update a directive's goal and bump goal_updated_at. Reactivates if idle.
pub async fn update_directive_goal(
    pool: &PgPool,
    owner_id: Uuid,
    directive_id: Uuid,
    goal: &str,
) -> Result<Option<Directive>, sqlx::Error> {
    sqlx::query_as::<_, Directive>(
        r#"
        UPDATE directives
        SET goal = $3,
            goal_updated_at = NOW(),
            status = CASE WHEN status = 'idle' THEN 'active' ELSE status END,
            updated_at = NOW(),
            version = version + 1
        WHERE id = $1 AND owner_id = $2
        RETURNING *
        "#,
    )
    .bind(directive_id)
    .bind(owner_id)
    .bind(goal)
    .fetch_optional(pool)
    .await
}

/// Set a directive's status (used for start/pause/archive transitions).
pub async fn set_directive_status(
    pool: &PgPool,
    owner_id: Uuid,
    directive_id: Uuid,
    status: &str,
) -> Result<Option<Directive>, sqlx::Error> {
    let mut query = String::from(
        r#"UPDATE directives SET status = $3, updated_at = NOW(), version = version + 1"#,
    );
    if status == "active" {
        query.push_str(", started_at = COALESCE(started_at, NOW())");
    }
    query.push_str(" WHERE id = $1 AND owner_id = $2 RETURNING *");

    sqlx::query_as::<_, Directive>(&query)
        .bind(directive_id)
        .bind(owner_id)
        .bind(status)
        .fetch_optional(pool)
        .await
}

// =============================================================================
// Directive Orchestrator Queries
// =============================================================================

/// Get active directives that need planning (no steps, no orchestrator task).
pub async fn get_directives_needing_planning(
    pool: &PgPool,
) -> Result<Vec<Directive>, sqlx::Error> {
    sqlx::query_as::<_, Directive>(
        r#"
        SELECT d.* FROM directives d
        WHERE d.status = 'active'
          AND d.orchestrator_task_id IS NULL
          AND NOT EXISTS (
            SELECT 1 FROM directive_steps WHERE directive_id = d.id
          )
        "#,
    )
    .fetch_all(pool)
    .await
}

/// A step joined with minimal directive info for dispatch.
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct StepForDispatch {
    // Step fields
    pub step_id: Uuid,
    pub directive_id: Uuid,
    pub step_name: String,
    pub step_description: Option<String>,
    pub task_plan: Option<String>,
    pub order_index: i32,
    pub generation: i32,
    pub depends_on: Vec<Uuid>,
    // Directive fields
    pub owner_id: Uuid,
    pub directive_title: String,
    pub repository_url: Option<String>,
    pub base_branch: Option<String>,
    /// The directive's PR branch (if a PR has already been created from previous steps).
    pub pr_branch: Option<String>,
}

/// Get ready steps that need task dispatch.
pub async fn get_ready_steps_for_dispatch(
    pool: &PgPool,
) -> Result<Vec<StepForDispatch>, sqlx::Error> {
    sqlx::query_as::<_, StepForDispatch>(
        r#"
        SELECT
            ds.id AS step_id,
            ds.directive_id,
            ds.name AS step_name,
            ds.description AS step_description,
            ds.task_plan,
            ds.order_index,
            ds.generation,
            ds.depends_on,
            d.owner_id,
            d.title AS directive_title,
            d.repository_url,
            d.base_branch,
            d.pr_branch
        FROM directive_steps ds
        JOIN directives d ON d.id = ds.directive_id
        WHERE ds.status = 'ready'
          AND ds.task_id IS NULL
          AND d.status = 'active'
        ORDER BY ds.order_index
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Task info for a dependency step (step → linked task).
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct DependencyTaskInfo {
    pub step_id: Uuid,
    pub task_id: Uuid,
    pub task_name: String,
}

/// Resolve dependency step UUIDs to their linked task IDs and names.
/// Returns results in the same order as the input `depends_on` slice.
pub async fn get_step_dependency_tasks(
    pool: &PgPool,
    depends_on: &[Uuid],
) -> Result<Vec<DependencyTaskInfo>, sqlx::Error> {
    if depends_on.is_empty() {
        return Ok(vec![]);
    }
    let rows = sqlx::query_as::<_, DependencyTaskInfo>(
        r#"
        SELECT ds.id AS step_id, t.id AS task_id, t.name AS task_name
        FROM directive_steps ds
        JOIN tasks t ON t.id = ds.task_id
        WHERE ds.id = ANY($1)
        "#,
    )
    .bind(depends_on)
    .fetch_all(pool)
    .await?;

    // Re-order to match input ordering
    let mut ordered = Vec::with_capacity(depends_on.len());
    for dep_id in depends_on {
        if let Some(row) = rows.iter().find(|r| r.step_id == *dep_id) {
            ordered.push(row.clone());
        }
    }
    Ok(ordered)
}

/// A running step joined with its task's current status.
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct RunningStepWithTask {
    pub step_id: Uuid,
    pub directive_id: Uuid,
    pub task_id: Uuid,
    pub task_status: String,
}

/// Get running steps with their task status for monitoring.
pub async fn get_running_steps_with_tasks(
    pool: &PgPool,
) -> Result<Vec<RunningStepWithTask>, sqlx::Error> {
    sqlx::query_as::<_, RunningStepWithTask>(
        r#"
        SELECT
            ds.id AS step_id,
            ds.directive_id,
            ds.task_id AS "task_id!",
            t.status AS task_status
        FROM directive_steps ds
        JOIN tasks t ON t.id = ds.task_id
        WHERE ds.status = 'running'
          AND ds.task_id IS NOT NULL
        "#,
    )
    .fetch_all(pool)
    .await
}

/// An orchestrator task to check (directive with pending planning task).
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct OrchestratorTaskCheck {
    pub directive_id: Uuid,
    pub orchestrator_task_id: Uuid,
    pub task_status: String,
    pub owner_id: Uuid,
}

/// Get directives with orchestrator tasks to check completion.
pub async fn get_orchestrator_tasks_to_check(
    pool: &PgPool,
) -> Result<Vec<OrchestratorTaskCheck>, sqlx::Error> {
    sqlx::query_as::<_, OrchestratorTaskCheck>(
        r#"
        SELECT
            d.id AS directive_id,
            d.orchestrator_task_id AS "orchestrator_task_id!",
            t.status AS task_status,
            d.owner_id
        FROM directives d
        JOIN tasks t ON t.id = d.orchestrator_task_id
        WHERE d.orchestrator_task_id IS NOT NULL
          AND d.status = 'active'
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Get active directives that need re-planning (goal updated after latest step).
pub async fn get_directives_needing_replanning(
    pool: &PgPool,
) -> Result<Vec<Directive>, sqlx::Error> {
    sqlx::query_as::<_, Directive>(
        r#"
        SELECT d.* FROM directives d
        WHERE d.status = 'active'
          AND d.orchestrator_task_id IS NULL
          AND EXISTS (
            SELECT 1 FROM directive_steps WHERE directive_id = d.id
          )
          AND d.goal_updated_at > (
            SELECT COALESCE(MAX(ds.created_at), '1970-01-01'::timestamptz)
            FROM directive_steps ds WHERE ds.directive_id = d.id
          )
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Assign a task to a step and set status to running.
pub async fn assign_task_to_step(
    pool: &PgPool,
    step_id: Uuid,
    task_id: Uuid,
) -> Result<Option<DirectiveStep>, sqlx::Error> {
    sqlx::query_as::<_, DirectiveStep>(
        r#"
        UPDATE directive_steps
        SET task_id = $2, status = 'running', started_at = NOW()
        WHERE id = $1
        RETURNING *
        "#,
    )
    .bind(step_id)
    .bind(task_id)
    .fetch_optional(pool)
    .await
}

/// Set the orchestrator_task_id on a directive.
pub async fn assign_orchestrator_task(
    pool: &PgPool,
    directive_id: Uuid,
    task_id: Uuid,
) -> Result<(), sqlx::Error> {
    sqlx::query(
        r#"
        UPDATE directives
        SET orchestrator_task_id = $2, updated_at = NOW()
        WHERE id = $1
        "#,
    )
    .bind(directive_id)
    .bind(task_id)
    .execute(pool)
    .await?;
    Ok(())
}

/// Clear the orchestrator_task_id on a directive.
pub async fn clear_orchestrator_task(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<(), sqlx::Error> {
    sqlx::query(
        r#"
        UPDATE directives
        SET orchestrator_task_id = NULL, updated_at = NOW()
        WHERE id = $1
        "#,
    )
    .bind(directive_id)
    .execute(pool)
    .await?;
    Ok(())
}

/// Link a task to a step without changing step status.
pub async fn link_task_to_step(
    pool: &PgPool,
    step_id: Uuid,
    task_id: Uuid,
) -> Result<(), sqlx::Error> {
    sqlx::query(
        r#"
        UPDATE directive_steps
        SET task_id = $2
        WHERE id = $1
        "#,
    )
    .bind(step_id)
    .bind(task_id)
    .execute(pool)
    .await?;
    Ok(())
}

/// Set a step to 'running' status (after its task has been dispatched).
pub async fn set_step_running(
    pool: &PgPool,
    step_id: Uuid,
) -> Result<(), sqlx::Error> {
    sqlx::query(
        r#"
        UPDATE directive_steps
        SET status = 'running', started_at = COALESCE(started_at, NOW())
        WHERE id = $1
        "#,
    )
    .bind(step_id)
    .execute(pool)
    .await?;
    Ok(())
}

/// Get pending directive tasks (tasks with directive_id that are still pending).
pub async fn get_pending_directive_tasks(
    pool: &PgPool,
) -> Result<Vec<Task>, sqlx::Error> {
    sqlx::query_as::<_, Task>(
        r#"
        SELECT * FROM tasks
        WHERE directive_id IS NOT NULL
          AND status = 'pending'
          AND daemon_id IS NULL
        ORDER BY created_at
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Get the max generation number for steps in a directive.
pub async fn get_directive_max_generation(
    pool: &PgPool,
    directive_id: Uuid,
) -> Result<i32, sqlx::Error> {
    let row: (Option<i32>,) = sqlx::query_as(
        r#"SELECT MAX(generation) FROM directive_steps WHERE directive_id = $1"#,
    )
    .bind(directive_id)
    .fetch_one(pool)
    .await?;
    Ok(row.0.unwrap_or(0))
}

// =============================================================================
// Order CRUD
// =============================================================================

/// Create a new order for the given owner.
pub async fn create_order(
    pool: &PgPool,
    owner_id: Uuid,
    req: CreateOrderRequest,
) -> Result<Order, sqlx::Error> {
    let priority = req.priority.as_deref().unwrap_or("medium");
    let status = req.status.as_deref().unwrap_or("open");
    let order_type = req.order_type.as_deref().unwrap_or("feature");

    sqlx::query_as::<_, Order>(
        r#"
        INSERT INTO orders (owner_id, title, description, priority, status, order_type, labels, directive_id, contract_id, repository_url)
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
        RETURNING *
        "#,
    )
    .bind(owner_id)
    .bind(&req.title)
    .bind(&req.description)
    .bind(priority)
    .bind(status)
    .bind(order_type)
    .bind(&req.labels)
    .bind(req.directive_id)
    .bind(req.contract_id)
    .bind(&req.repository_url)
    .fetch_one(pool)
    .await
}

/// List orders for the given owner with optional filters.
pub async fn list_orders(
    pool: &PgPool,
    owner_id: Uuid,
    status_filter: Option<&str>,
    type_filter: Option<&str>,
    priority_filter: Option<&str>,
    directive_id_filter: Option<Uuid>,
    contract_id_filter: Option<Uuid>,
) -> Result<Vec<Order>, sqlx::Error> {
    // Build dynamic query with optional filters
    let mut query = String::from("SELECT * FROM orders WHERE owner_id = $1");
    let mut param_idx = 2u32;

    if status_filter.is_some() {
        query.push_str(&format!(" AND status = ${}", param_idx));
        param_idx += 1;
    }
    if type_filter.is_some() {
        query.push_str(&format!(" AND order_type = ${}", param_idx));
        param_idx += 1;
    }
    if priority_filter.is_some() {
        query.push_str(&format!(" AND priority = ${}", param_idx));
        param_idx += 1;
    }
    if directive_id_filter.is_some() {
        query.push_str(&format!(" AND directive_id = ${}", param_idx));
        param_idx += 1;
    }
    if contract_id_filter.is_some() {
        query.push_str(&format!(" AND contract_id = ${}", param_idx));
        let _ = param_idx; // suppress unused warning
    }
    query.push_str(" ORDER BY created_at DESC");

    let mut q = sqlx::query_as::<_, Order>(&query).bind(owner_id);

    if let Some(s) = status_filter {
        q = q.bind(s);
    }
    if let Some(t) = type_filter {
        q = q.bind(t);
    }
    if let Some(p) = priority_filter {
        q = q.bind(p);
    }
    if let Some(d) = directive_id_filter {
        q = q.bind(d);
    }
    if let Some(c) = contract_id_filter {
        q = q.bind(c);
    }

    q.fetch_all(pool).await
}

/// Get a single order by ID (owner-scoped).
pub async fn get_order(
    pool: &PgPool,
    owner_id: Uuid,
    order_id: Uuid,
) -> Result<Option<Order>, sqlx::Error> {
    sqlx::query_as::<_, Order>(
        r#"SELECT * FROM orders WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(order_id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await
}

/// Update an order (owner-scoped). Uses COALESCE pattern to only update provided fields.
pub async fn update_order(
    pool: &PgPool,
    owner_id: Uuid,
    order_id: Uuid,
    req: UpdateOrderRequest,
) -> Result<Option<Order>, sqlx::Error> {
    let current = sqlx::query_as::<_, Order>(
        r#"SELECT * FROM orders WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(order_id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await?;

    let current = match current {
        Some(c) => c,
        None => return Ok(None),
    };

    let title = req.title.as_deref().unwrap_or(&current.title);
    let description = req.description.as_deref().or(current.description.as_deref());
    let priority = req.priority.as_deref().unwrap_or(&current.priority);
    let status = req.status.as_deref().unwrap_or(&current.status);
    let order_type = req.order_type.as_deref().unwrap_or(&current.order_type);
    let labels = req.labels.as_ref().unwrap_or(&current.labels);
    let directive_id = req.directive_id.or(current.directive_id);
    let directive_step_id = req.directive_step_id.or(current.directive_step_id);
    let contract_id = req.contract_id.or(current.contract_id);
    let repository_url = req.repository_url.as_deref().or(current.repository_url.as_deref());

    sqlx::query_as::<_, Order>(
        r#"
        UPDATE orders
        SET title = $3, description = $4, priority = $5, status = $6,
            order_type = $7, labels = $8, directive_id = $9, directive_step_id = $10,
            contract_id = $11, repository_url = $12, updated_at = NOW()
        WHERE id = $1 AND owner_id = $2
        RETURNING *
        "#,
    )
    .bind(order_id)
    .bind(owner_id)
    .bind(title)
    .bind(description)
    .bind(priority)
    .bind(status)
    .bind(order_type)
    .bind(labels)
    .bind(directive_id)
    .bind(directive_step_id)
    .bind(contract_id)
    .bind(repository_url)
    .fetch_optional(pool)
    .await
}

/// Delete an order (owner-scoped). Returns true if a row was deleted.
pub async fn delete_order(
    pool: &PgPool,
    owner_id: Uuid,
    order_id: Uuid,
) -> Result<bool, sqlx::Error> {
    let result = sqlx::query(
        r#"DELETE FROM orders WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(order_id)
    .bind(owner_id)
    .execute(pool)
    .await?;

    Ok(result.rows_affected() > 0)
}

/// Link an order to a directive.
pub async fn link_order_to_directive(
    pool: &PgPool,
    owner_id: Uuid,
    order_id: Uuid,
    directive_id: Uuid,
) -> Result<Option<Order>, sqlx::Error> {
    sqlx::query_as::<_, Order>(
        r#"
        UPDATE orders
        SET directive_id = $3, updated_at = NOW()
        WHERE id = $1 AND owner_id = $2
        RETURNING *
        "#,
    )
    .bind(order_id)
    .bind(owner_id)
    .bind(directive_id)
    .fetch_optional(pool)
    .await
}

/// Link an order to a contract.
pub async fn link_order_to_contract(
    pool: &PgPool,
    owner_id: Uuid,
    order_id: Uuid,
    contract_id: Uuid,
) -> Result<Option<Order>, sqlx::Error> {
    sqlx::query_as::<_, Order>(
        r#"
        UPDATE orders
        SET contract_id = $3, updated_at = NOW()
        WHERE id = $1 AND owner_id = $2
        RETURNING *
        "#,
    )
    .bind(order_id)
    .bind(owner_id)
    .bind(contract_id)
    .fetch_optional(pool)
    .await
}

/// Convert an order to a directive step. Creates a new DirectiveStep from the order's
/// title and description, links the order to both the directive and the new step,
/// and returns the created step.
pub async fn convert_order_to_step(
    pool: &PgPool,
    owner_id: Uuid,
    order_id: Uuid,
    directive_id: Uuid,
) -> Result<Option<DirectiveStep>, sqlx::Error> {
    // Verify the order exists and belongs to this owner
    let order = sqlx::query_as::<_, Order>(
        r#"SELECT * FROM orders WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(order_id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await?;

    let order = match order {
        Some(o) => o,
        None => return Ok(None),
    };

    // Verify the directive exists and belongs to this owner
    let directive = sqlx::query_as::<_, Directive>(
        r#"SELECT * FROM directives WHERE id = $1 AND owner_id = $2"#,
    )
    .bind(directive_id)
    .bind(owner_id)
    .fetch_optional(pool)
    .await?;

    if directive.is_none() {
        return Ok(None);
    }

    // Get the next order_index for this directive
    let max_index: (Option<i32>,) = sqlx::query_as(
        r#"SELECT MAX(order_index) FROM directive_steps WHERE directive_id = $1"#,
    )
    .bind(directive_id)
    .fetch_one(pool)
    .await?;
    let next_index = max_index.0.unwrap_or(-1) + 1;

    // Create the directive step from order data
    let step = sqlx::query_as::<_, DirectiveStep>(
        r#"
        INSERT INTO directive_steps (directive_id, name, description, order_index)
        VALUES ($1, $2, $3, $4)
        RETURNING *
        "#,
    )
    .bind(directive_id)
    .bind(&order.title)
    .bind(&order.description)
    .bind(next_index)
    .fetch_one(pool)
    .await?;

    // Link the order to the directive and the new step
    sqlx::query(
        r#"
        UPDATE orders
        SET directive_id = $3, directive_step_id = $4, updated_at = NOW()
        WHERE id = $1 AND owner_id = $2
        "#,
    )
    .bind(order_id)
    .bind(owner_id)
    .bind(directive_id)
    .bind(step.id)
    .execute(pool)
    .await?;

    Ok(Some(step))
}

