//! Contract subcommand - task-contract interaction commands.

use clap::{Args, Subcommand};
use uuid::Uuid;

/// Common arguments for contract commands.
#[derive(Args, Debug, Clone)]
pub struct ContractArgs {
    /// API URL
    #[arg(long, env = "MAKIMA_API_URL", default_value = "https://api.makima.jp", global = true)]
    pub api_url: String,

    /// API key for authentication
    #[arg(long, env = "MAKIMA_API_KEY", global = true)]
    pub api_key: String,

    /// Current task ID (optional)
    #[arg(long, env = "MAKIMA_TASK_ID", global = true)]
    pub task_id: Option<Uuid>,

    /// Contract ID
    #[arg(long, env = "MAKIMA_CONTRACT_ID", global = true)]
    pub contract_id: Uuid,
}

/// Arguments for file command (get specific file).
#[derive(Args, Debug)]
pub struct FileArgs {
    #[command(flatten)]
    pub common: ContractArgs,

    /// File ID to retrieve
    pub file_id: Uuid,
}

/// Arguments for report command.
#[derive(Args, Debug)]
pub struct ReportArgs {
    #[command(flatten)]
    pub common: ContractArgs,

    /// Progress message
    pub message: String,
}

/// Arguments for completion-action command.
#[derive(Args, Debug)]
pub struct CompletionActionArgs {
    #[command(flatten)]
    pub common: ContractArgs,

    /// Comma-separated list of modified files
    #[arg(long)]
    pub files: Option<String>,

    /// Number of lines added
    #[arg(long, default_value = "0")]
    pub lines_added: i32,

    /// Number of lines removed
    #[arg(long, default_value = "0")]
    pub lines_removed: i32,

    /// Whether there are code changes
    #[arg(long)]
    pub code: bool,
}

/// Arguments for update-file command.
#[derive(Args, Debug)]
pub struct UpdateFileArgs {
    #[command(flatten)]
    pub common: ContractArgs,

    /// File ID to update
    pub file_id: Uuid,
}

/// Arguments for create-file command.
#[derive(Args, Debug)]
pub struct CreateFileArgs {
    #[command(flatten)]
    pub common: ContractArgs,

    /// Name of the new file
    pub name: String,
}

// ============================================================================
// Contracts management commands (makima contracts ...)
// ============================================================================

/// Common arguments for contracts management commands.
#[derive(Args, Debug, Clone)]
pub struct ContractsCommonArgs {
    /// API URL
    #[arg(long, env = "MAKIMA_API_URL", default_value = "https://api.makima.jp", global = true)]
    pub api_url: String,

    /// API key for authentication
    #[arg(long, env = "MAKIMA_API_KEY", global = true)]
    pub api_key: String,
}

/// Contracts management subcommands.
#[derive(Subcommand, Debug)]
pub enum ContractsSubcommand {
    /// List all contracts with optional filters
    List(ListArgs),

    /// Clean up old contracts, archived contracts, and orphaned worktrees
    Cleanup(CleanupArgs),
}

/// Output format for list command.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum ListOutputFormat {
    #[default]
    Table,
    Json,
    Compact,
}

impl std::str::FromStr for ListOutputFormat {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().as_str() {
            "table" => Ok(ListOutputFormat::Table),
            "json" => Ok(ListOutputFormat::Json),
            "compact" => Ok(ListOutputFormat::Compact),
            _ => Err(format!("Invalid format '{}'. Valid options: table, json, compact", s)),
        }
    }
}

impl std::fmt::Display for ListOutputFormat {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            ListOutputFormat::Table => write!(f, "table"),
            ListOutputFormat::Json => write!(f, "json"),
            ListOutputFormat::Compact => write!(f, "compact"),
        }
    }
}

/// Arguments for the list subcommand.
#[derive(Args, Debug)]
pub struct ListArgs {
    #[command(flatten)]
    pub common: ContractsCommonArgs,

    /// Filter by status (active, completed, failed)
    #[arg(long, value_delimiter = ',')]
    pub status: Option<Vec<String>>,

    /// Show only stale contracts (no activity within threshold)
    #[arg(long)]
    pub stale: bool,

    /// Stale threshold duration (e.g., "30m", "1h", "2d"). Default: 30m
    #[arg(long, default_value = "30m")]
    pub threshold: String,

    /// Show contracts waiting for user input
    #[arg(long)]
    pub waiting: bool,

    /// Filter by phase (e.g., "plan", "execute", "review")
    #[arg(long)]
    pub phase: Option<String>,

    /// Output format: table, json, or compact
    #[arg(long, short = 'f', default_value = "table")]
    pub format: String,

    /// Limit number of results
    #[arg(long, short = 'n')]
    pub limit: Option<usize>,
}

impl ListArgs {
    /// Parse the format string into a ListOutputFormat enum.
    pub fn parse_format(&self) -> Result<ListOutputFormat, String> {
        self.format.parse()
    }

    /// Parse the threshold duration into seconds.
    pub fn parse_threshold(&self) -> Result<u64, String> {
        parse_duration(&self.threshold)
    }
}

/// Arguments for the cleanup subcommand.
#[derive(Args, Debug)]
pub struct CleanupArgs {
    #[command(flatten)]
    pub common: ContractsCommonArgs,

    /// Archive completed/failed contracts older than the threshold
    #[arg(long)]
    pub archive: bool,

    /// Delete archived contracts older than the threshold
    #[arg(long)]
    pub delete_archived: bool,

    /// Clean up orphaned worktrees (worktrees without associated contracts)
    #[arg(long)]
    pub worktrees: bool,

    /// Run all cleanup operations (archive, delete-archived, worktrees)
    #[arg(long)]
    pub all: bool,

    /// Age threshold for cleanup operations (e.g., "7d", "24h", "30d")
    /// Default: 7d (7 days)
    #[arg(long, default_value = "7d")]
    pub older_than: String,

    /// Show what would be affected without making changes
    #[arg(long)]
    pub dry_run: bool,

    /// Skip confirmation prompts for destructive operations
    #[arg(long)]
    pub force: bool,
}

impl CleanupArgs {
    /// Parse the older_than duration string into seconds.
    /// Supports formats like "7d", "24h", "30m", "60s".
    pub fn parse_older_than(&self) -> Result<u64, String> {
        parse_duration(&self.older_than)
    }

    /// Returns true if any cleanup operation is selected.
    pub fn has_any_operation(&self) -> bool {
        self.archive || self.delete_archived || self.worktrees || self.all
    }
}

/// Parse a duration string like "7d", "24h", "30m", "60s" into seconds.
pub fn parse_duration(s: &str) -> Result<u64, String> {
    let s = s.trim();
    if s.is_empty() {
        return Err("Empty duration string".to_string());
    }

    let (num_str, unit) = if s.ends_with('d') || s.ends_with('D') {
        (&s[..s.len() - 1], 'd')
    } else if s.ends_with('h') || s.ends_with('H') {
        (&s[..s.len() - 1], 'h')
    } else if s.ends_with('m') || s.ends_with('M') {
        (&s[..s.len() - 1], 'm')
    } else if s.ends_with('s') || s.ends_with('S') {
        (&s[..s.len() - 1], 's')
    } else {
        // Default to days if no unit
        (s, 'd')
    };

    let num: u64 = num_str
        .parse()
        .map_err(|_| format!("Invalid number in duration: {}", num_str))?;

    let seconds = match unit {
        'd' => num * 24 * 60 * 60,
        'h' => num * 60 * 60,
        'm' => num * 60,
        's' => num,
        _ => unreachable!(),
    };

    Ok(seconds)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_parse_duration() {
        assert_eq!(parse_duration("7d").unwrap(), 7 * 24 * 60 * 60);
        assert_eq!(parse_duration("24h").unwrap(), 24 * 60 * 60);
        assert_eq!(parse_duration("30m").unwrap(), 30 * 60);
        assert_eq!(parse_duration("60s").unwrap(), 60);
        assert_eq!(parse_duration("7D").unwrap(), 7 * 24 * 60 * 60);
        assert_eq!(parse_duration("7").unwrap(), 7 * 24 * 60 * 60); // defaults to days
        assert!(parse_duration("").is_err());
        assert!(parse_duration("abc").is_err());
    }
}