//! OSIS Worker Binary - Synchronous actor for system-level operations

use clap::Parser;
use log::{error, info};
use baobab_actor::config::{ConfigError, WorkerConfig};
use baobab_actor::engine::create_heromodels_engine;
use baobab_actor::sync_actor::SyncWorker;
use baobab_actor::actor_trait::{spawn_actor, WorkerConfig as TraitWorkerConfig};
use std::path::PathBuf;
use std::sync::Arc;
use tokio::signal;
use tokio::sync::mpsc;

#[derive(Parser, Debug)]
#[command(
    name = "osis",
    version = "0.1.0",
    about = "OSIS (Operating System Integration Service) - Synchronous Worker",
    long_about = "A synchronous actor for Hero framework that processes jobs sequentially. \
                  Ideal for system-level operations that require careful resource management."
)]
struct Args {
    /// Path to TOML configuration file
    #[arg(short, long, help = "Path to TOML configuration file")]
    config: PathBuf,

    /// Override actor ID from config
    #[arg(long, help = "Override actor ID from configuration file")]
    actor_id: Option<String>,

    /// Override Redis URL from config
    #[arg(long, help = "Override Redis URL from configuration file")]
    redis_url: Option<String>,

    /// Override database path from config
    #[arg(long, help = "Override database path from configuration file")]
    db_path: Option<String>,

    /// Enable verbose logging (debug level)
    #[arg(short, long, help = "Enable verbose logging")]
    verbose: bool,

    /// Disable timestamps in log output
    #[arg(long, help = "Remove timestamps from log output")]
    no_timestamp: bool,
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let args = Args::parse();

    // Load configuration from TOML file
    let mut config = match WorkerConfig::from_file(&args.config) {
        Ok(config) => config,
        Err(e) => {
            eprintln!("Failed to load configuration from {:?}: {}", args.config, e);
            std::process::exit(1);
        }
    };

    // Validate that this is a sync actor configuration
    if !config.is_sync() {
        eprintln!("Error: OSIS actor requires a sync actor configuration");
        eprintln!("Expected: [actor_type] type = \"sync\"");
        eprintln!("Found: {:?}", config.actor_type);
        std::process::exit(1);
    }

    // Apply command line overrides
    if let Some(actor_id) = args.actor_id {
        config.actor_id = actor_id;
    }
    if let Some(redis_url) = args.redis_url {
        config.redis_url = redis_url;
    }
    if let Some(db_path) = args.db_path {
        config.db_path = db_path;
    }

    // Configure logging
    setup_logging(&config, args.verbose, args.no_timestamp)?;

    info!("🚀 OSIS Worker starting...");
    info!("Worker ID: {}", config.actor_id);
    info!("Redis URL: {}", config.redis_url);
    info!("Database Path: {}", config.db_path);
    info!("Preserve Tasks: {}", config.preserve_tasks);

    // Create Rhai engine
    let engine = create_heromodels_engine();
    info!("✅ Rhai engine initialized");

    // Create actor configuration for the trait-based interface
    let actor_config = TraitWorkerConfig::new(
        config.actor_id.clone(),
        config.db_path.clone(),
        config.redis_url.clone(),
        config.preserve_tasks,
    );

    // Create sync actor instance
    let actor = Arc::new(SyncWorker::default());
    info!("✅ Sync actor instance created");

    // Setup shutdown signal handling
    let (shutdown_tx, shutdown_rx) = mpsc::channel(1);
    
    // Spawn shutdown signal handler
    let shutdown_tx_clone = shutdown_tx.clone();
    tokio::spawn(async move {
        if let Err(e) = signal::ctrl_c().await {
            error!("Failed to listen for shutdown signal: {}", e);
            return;
        }
        info!("🛑 Shutdown signal received");
        if let Err(e) = shutdown_tx_clone.send(()).await {
            error!("Failed to send shutdown signal: {}", e);
        }
    });

    // Spawn the actor
    info!("🔄 Starting actor loop...");
    let actor_handle = spawn_actor(actor, engine, shutdown_rx);

    // Wait for the actor to complete
    match actor_handle.await {
        Ok(Ok(())) => {
            info!("✅ OSIS Worker shut down gracefully");
        }
        Ok(Err(e)) => {
            error!("❌ OSIS Worker encountered an error: {}", e);
            std::process::exit(1);
        }
        Err(e) => {
            error!("❌ Failed to join actor task: {}", e);
            std::process::exit(1);
        }
    }

    Ok(())
}

/// Setup logging based on configuration and command line arguments
fn setup_logging(
    config: &WorkerConfig,
    verbose: bool,
    no_timestamp: bool,
) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let mut builder = env_logger::Builder::new();

    // Determine log level
    let log_level = if verbose {
        "debug"
    } else {
        &config.logging.level
    };

    // Set log level
    builder.filter_level(match log_level.to_lowercase().as_str() {
        "trace" => log::LevelFilter::Trace,
        "debug" => log::LevelFilter::Debug,
        "info" => log::LevelFilter::Info,
        "warn" => log::LevelFilter::Warn,
        "error" => log::LevelFilter::Error,
        _ => {
            eprintln!("Invalid log level: {}. Using 'info'", log_level);
            log::LevelFilter::Info
        }
    });

    // Configure timestamps
    let show_timestamps = !no_timestamp && config.logging.timestamps;
    if !show_timestamps {
        builder.format_timestamp(None);
    }

    builder.init();
    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::io::Write;
    use tempfile::NamedTempFile;

    #[test]
    fn test_config_validation() {
        let config_toml = r#"
actor_id = "test_osis"
redis_url = "redis://localhost:6379"
db_path = "/tmp/test_db"

[actor_type]
type = "sync"

[logging]
level = "info"
"#;

        let mut temp_file = NamedTempFile::new().unwrap();
        temp_file.write_all(config_toml.as_bytes()).unwrap();

        let config = WorkerConfig::from_file(temp_file.path()).unwrap();
        assert!(config.is_sync());
        assert!(!config.is_async());
        assert_eq!(config.actor_id, "test_osis");
    }

    #[test]
    fn test_async_config_rejection() {
        let config_toml = r#"
actor_id = "test_osis"
redis_url = "redis://localhost:6379"
db_path = "/tmp/test_db"

[actor_type]
type = "async"
default_timeout_seconds = 300

[logging]
level = "info"
"#;

        let mut temp_file = NamedTempFile::new().unwrap();
        temp_file.write_all(config_toml.as_bytes()).unwrap();

        let config = WorkerConfig::from_file(temp_file.path()).unwrap();
        assert!(!config.is_sync());
        assert!(config.is_async());
        // This would be rejected in main() function
    }
}