use atuin_client::database::Sqlite as HistoryDatabase;
use atuin_client::record::sqlite_store::SqliteStore;
use atuin_client::settings::{Settings, watcher::global_settings_watcher};
use eyre::Result;

pub mod client;
pub mod components;
pub mod control;
pub mod daemon;
pub mod events;
pub mod history;
pub mod search;
pub mod semantic;
pub mod server;

// Re-export core daemon types for convenience
pub use daemon::{Component, Daemon, DaemonBuilder, DaemonHandle};
pub use events::DaemonEvent;

// Re-export components
pub use components::{HistoryComponent, SearchComponent, SemanticComponent, SyncComponent};

// Re-export client helpers
pub use client::{ControlClient, SemanticClient, emit_event, emit_event_with_settings};

/// Boot the daemon using the new component-based architecture.
///
/// This creates a daemon with the standard components (history, search, sync),
/// starts the gRPC server with their services, and runs the event loop.
pub async fn boot(
    settings: Settings,
    store: SqliteStore,
    history_db: HistoryDatabase,
) -> Result<()> {
    // Create the components
    let history_component = HistoryComponent::new();
    let search_component = SearchComponent::new();
    let semantic_component = SemanticComponent::new();
    let sync_component = SyncComponent::new();

    // Get the gRPC services before moving components into the daemon
    // (The services share state with the components via Arc)
    let history_service = history_component.grpc_service();
    let search_service = search_component.grpc_service();
    let semantic_service = semantic_component.grpc_service();

    // Build the daemon
    let mut daemon = Daemon::builder(settings.clone())
        .store(store)
        .history_db(history_db)
        .component(history_component)
        .component(search_component)
        .component(semantic_component)
        .component(sync_component)
        .build()
        .await?;

    // Get a handle for the control service and gRPC server shutdown
    let handle = daemon.handle();

    // Create the control service
    let control_service = control::ControlService::new(handle.clone());

    // Start all components first (so gRPC services can work)
    daemon.start_components().await?;

    // Spawn config file watcher to reload settings on changes
    if let Ok(watcher) = global_settings_watcher() {
        let mut settings_rx = watcher.subscribe();
        let watcher_handle = handle.clone();
        tokio::spawn(async move {
            tracing::info!("config file watcher started");
            while settings_rx.changed().await.is_ok() {
                // Use the already-loaded settings from the watcher
                // (avoids parsing the config file twice)
                let new_settings = (*settings_rx.borrow()).clone();
                watcher_handle.apply_settings((*new_settings).clone()).await;
            }
            tracing::debug!("config file watcher stopped");
        });
    } else {
        tracing::warn!(
            "failed to start config file watcher; settings changes will require daemon restart"
        );
    }

    // Spawn signal handler to emit ShutdownRequested on Ctrl+C/SIGTERM
    let signal_handle = handle.clone();
    tokio::spawn(async move {
        shutdown_signal().await;
        tracing::info!("received shutdown signal");
        signal_handle.shutdown();
    });

    // Start the gRPC server in the background
    server::run_grpc_server(
        settings,
        history_service,
        search_service,
        semantic_service,
        control_service.into_server(),
        handle,
    )
    .await?;

    // Run the daemon event loop
    daemon.run_event_loop().await?;

    // Stop all components on shutdown
    daemon.stop_components().await;

    tracing::info!("daemon shut down complete");
    Ok(())
}

/// Wait for a shutdown signal (Ctrl+C or SIGTERM).
#[cfg(unix)]
async fn shutdown_signal() {
    let mut term = tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
        .expect("failed to register sigterm handler");
    let mut int = tokio::signal::unix::signal(tokio::signal::unix::SignalKind::interrupt())
        .expect("failed to register sigint handler");

    tokio::select! {
        _ = term.recv() => {},
        _ = int.recv() => {},
    }
}

/// Wait for a shutdown signal (Ctrl+C).
#[cfg(not(unix))]
async fn shutdown_signal() {
    tokio::signal::ctrl_c()
        .await
        .expect("failed to listen for ctrl+c");
}
