//! Makima Daemon - Git worktree orchestration for Claude Code.

use std::sync::Arc;

use std::path::Path;

use clap::Parser;
use makima_daemon::cli::Cli;
use makima_daemon::config::{DaemonConfig, RepoEntry};
use makima_daemon::db::LocalDb;
use makima_daemon::error::DaemonError;
use makima_daemon::task::{TaskConfig, TaskManager};
use makima_daemon::ws::{DaemonCommand, WsClient};
use tokio::process::Command;
use tokio::sync::mpsc;
use tracing_subscriber::{fmt, prelude::*, EnvFilter};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    eprintln!("=== Makima Daemon Starting ===");

    // Parse command-line arguments
    let cli = Cli::parse();

    // Load configuration with CLI overrides
    eprintln!("[1/5] Loading configuration...");
    let config = match DaemonConfig::load_with_cli(&cli) {
        Ok(cfg) => {
            eprintln!("      Config loaded: server={}", cfg.server.url);
            cfg
        }
        Err(e) => {
            eprintln!("Failed to load configuration: {}", e);
            eprintln!();
            eprintln!("Use CLI flags:");
            eprintln!("  makima-daemon --server-url ws://localhost:8080 --api-key your-api-key");
            eprintln!();
            eprintln!("Or set environment variables:");
            eprintln!("  MAKIMA_DAEMON_SERVER_URL=ws://localhost:8080");
            eprintln!("  MAKIMA_API_KEY=your-api-key");
            eprintln!();
            eprintln!("Or create a config file: makima-daemon.toml");
            eprintln!();
            eprintln!("Run 'makima-daemon --help' for all options.");
            std::process::exit(1);
        }
    };

    // Initialize logging
    init_logging(&config.logging.level, &config.logging.format);
    eprintln!("[2/5] Logging initialized");

    // Initialize local database
    eprintln!("[3/5] Opening local database: {}", config.local_db.path.display());
    let _local_db = LocalDb::open(&config.local_db.path)?;
    eprintln!("      Database opened");

    // Initialize worktree directories
    eprintln!("[4/5] Setting up directories...");
    tokio::fs::create_dir_all(&config.worktree.base_dir).await?;
    tokio::fs::create_dir_all(&config.worktree.repos_dir).await?;
    tokio::fs::create_dir_all(&config.repos.home_dir).await?;
    eprintln!("      Worktree base: {}", config.worktree.base_dir.display());
    eprintln!("      Repos cache: {}", config.worktree.repos_dir.display());
    eprintln!("      Home dir: {}", config.repos.home_dir.display());

    // Auto-clone repositories if configured
    if !config.repos.auto_clone.is_empty() {
        eprintln!("      Auto-cloning {} repositories...", config.repos.auto_clone.len());
        for repo_entry in &config.repos.auto_clone {
            if let Err(e) = auto_clone_repo(repo_entry, &config.repos.home_dir).await {
                eprintln!("      WARNING: Failed to clone {}: {}", repo_entry.url(), e);
            }
        }
    }

    // Create channels for communication
    let (command_tx, mut command_rx) = mpsc::channel::<DaemonCommand>(64);

    // Get machine info
    let machine_id = get_machine_id();
    let hostname = get_hostname();
    eprintln!("      Machine ID: {}", machine_id);
    eprintln!("      Hostname: {}", hostname);

    // Create WebSocket client
    eprintln!("[5/5] Connecting to server: {}", config.server.url);
    let mut ws_client = WsClient::new(
        config.server.clone(),
        machine_id,
        hostname,
        config.process.max_concurrent_tasks as i32,
        command_tx,
    );

    // Get sender for task manager
    let ws_tx = ws_client.sender();

    // Create task configuration
    let task_config = TaskConfig {
        max_concurrent_tasks: config.process.max_concurrent_tasks,
        worktree_base_dir: config.worktree.base_dir.clone(),
        env_vars: config.process.env_vars.clone(),
        claude_command: config.process.claude_command.clone(),
        claude_args: config.process.claude_args.clone(),
        claude_pre_args: config.process.claude_pre_args.clone(),
        enable_permissions: config.process.enable_permissions,
        disable_verbose: config.process.disable_verbose,
    };

    // Create task manager
    let task_manager = Arc::new(TaskManager::new(task_config, ws_tx.clone()));

    // Spawn command handler
    let task_manager_clone = task_manager.clone();
    tokio::spawn(async move {
        tracing::info!("Command handler started, waiting for commands...");
        while let Some(command) = command_rx.recv().await {
            tracing::info!("Received command from channel: {:?}", command);
            if let Err(e) = task_manager_clone.handle_command(command).await {
                tracing::error!("Failed to handle command: {}", e);
            }
        }
        tracing::info!("Command handler stopped");
    });

    // Handle shutdown signals
    let shutdown_signal = async {
        tokio::signal::ctrl_c()
            .await
            .expect("Failed to install Ctrl+C handler");
        eprintln!("\nReceived shutdown signal");
    };

    eprintln!("=== Daemon running (Ctrl+C to stop) ===");

    // Run WebSocket client with shutdown handling
    tokio::select! {
        result = ws_client.run() => {
            match result {
                Ok(()) => eprintln!("WebSocket client exited cleanly"),
                Err(DaemonError::AuthFailed(msg)) => {
                    eprintln!("ERROR: Authentication failed: {}", msg);
                    std::process::exit(1);
                }
                Err(e) => {
                    eprintln!("ERROR: WebSocket client error: {}", e);
                    std::process::exit(1);
                }
            }
        }
        _ = shutdown_signal => {
            eprintln!("Shutting down...");
        }
    }

    // Cleanup
    tracing::info!("Daemon stopped");

    Ok(())
}

fn init_logging(level: &str, format: &str) {
    let filter = EnvFilter::try_from_default_env()
        .or_else(|_| EnvFilter::try_new(level))
        .unwrap_or_else(|_| EnvFilter::new("info"));

    let subscriber = tracing_subscriber::registry().with(filter);

    if format == "json" {
        subscriber.with(fmt::layer().json()).init();
    } else {
        subscriber.with(fmt::layer()).init();
    }
}

fn get_machine_id() -> String {
    // Try to read machine-id from standard locations
    #[cfg(target_os = "linux")]
    {
        if let Ok(id) = std::fs::read_to_string("/etc/machine-id") {
            return id.trim().to_string();
        }
        if let Ok(id) = std::fs::read_to_string("/var/lib/dbus/machine-id") {
            return id.trim().to_string();
        }
    }

    #[cfg(target_os = "macos")]
    {
        // Use IOPlatformSerialNumber
        if let Ok(output) = std::process::Command::new("ioreg")
            .args(["-rd1", "-c", "IOPlatformExpertDevice"])
            .output()
        {
            let stdout = String::from_utf8_lossy(&output.stdout);
            for line in stdout.lines() {
                if line.contains("IOPlatformUUID") {
                    if let Some(uuid) = line.split('"').nth(3) {
                        return uuid.to_string();
                    }
                }
            }
        }
    }

    // Fallback: generate a random ID and persist it
    let state_dir = dirs_next::data_local_dir()
        .unwrap_or_else(|| std::path::PathBuf::from("."))
        .join("makima-daemon");
    let machine_id_file = state_dir.join("machine-id");

    if let Ok(id) = std::fs::read_to_string(&machine_id_file) {
        return id.trim().to_string();
    }

    // Generate new ID
    let new_id = uuid::Uuid::new_v4().to_string();
    std::fs::create_dir_all(&state_dir).ok();
    std::fs::write(&machine_id_file, &new_id).ok();
    new_id
}

fn get_hostname() -> String {
    hostname::get()
        .map(|h| h.to_string_lossy().to_string())
        .unwrap_or_else(|_| "unknown".to_string())
}

/// Auto-clone a repository to the home directory if it doesn't exist.
async fn auto_clone_repo(
    repo_entry: &RepoEntry,
    home_dir: &Path,
) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let dir_name = repo_entry
        .dir_name()
        .ok_or("Could not determine directory name from URL")?;
    let target_dir = home_dir.join(&dir_name);

    // Check if already cloned
    if target_dir.exists() {
        eprintln!("      [skip] {} (already exists)", dir_name);
        return Ok(());
    }

    let url = repo_entry.expanded_url();
    eprintln!("      [clone] {} -> {}", url, target_dir.display());

    // Build git clone command
    let mut args = vec!["clone".to_string()];

    // Add shallow clone if requested
    if repo_entry.shallow() {
        args.push("--depth".to_string());
        args.push("1".to_string());
    }

    // Add branch if specified
    if let Some(branch) = repo_entry.branch() {
        args.push("--branch".to_string());
        args.push(branch.to_string());
    }

    args.push(url.clone());
    args.push(target_dir.to_string_lossy().to_string());

    // Run git clone
    let output = Command::new("git")
        .args(&args)
        .output()
        .await?;

    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        return Err(format!("git clone failed: {}", stderr).into());
    }

    eprintln!("      [done] {}", dir_name);
    Ok(())
}

/// dirs_next minimal replacement
mod dirs_next {
    use std::path::PathBuf;

    pub fn data_local_dir() -> Option<PathBuf> {
        #[cfg(target_os = "macos")]
        {
            std::env::var("HOME")
                .ok()
                .map(|h| PathBuf::from(h).join("Library").join("Application Support"))
        }
        #[cfg(target_os = "linux")]
        {
            std::env::var("XDG_DATA_HOME")
                .ok()
                .map(PathBuf::from)
                .or_else(|| {
                    std::env::var("HOME")
                        .ok()
                        .map(|h| PathBuf::from(h).join(".local").join("share"))
                })
        }
        #[cfg(target_os = "windows")]
        {
            std::env::var("LOCALAPPDATA").ok().map(PathBuf::from)
        }
        #[cfg(not(any(target_os = "macos", target_os = "linux", target_os = "windows")))]
        {
            None
        }
    }
}