//! Control service implementation.
//!
//! This gRPC service allows external processes (like CLI commands) to inject
//! events into the daemon's event bus.

use crate::atuin_client::history::HistoryId;
use tonic::{Request, Response, Status};
use tracing::{Level, info, instrument};

use super::{
    SendEventRequest, SendEventResponse,
    control_server::{Control, ControlServer},
    send_event_request::Event,
};
use crate::atuin_daemon::{daemon::DaemonHandle, events::DaemonEvent};

/// The Control gRPC service.
///
/// This service is used by external processes to inject events into the daemon.
/// It's not a component - it's part of the daemon's core infrastructure.
pub(crate) struct ControlService {
    handle: DaemonHandle,
}

impl ControlService {
    /// Create a new control service with the given daemon handle.
    pub(crate) fn new(handle: DaemonHandle) -> Self {
        Self { handle }
    }

    /// Get a tonic server for this service.
    pub(crate) fn into_server(self) -> ControlServer<Self> {
        ControlServer::new(self)
    }
}

#[tonic::async_trait]
impl Control for ControlService {
    #[instrument(skip_all, level = Level::INFO, name = "control_send_event")]
    async fn send_event(
        &self,
        request: Request<SendEventRequest>,
    ) -> Result<Response<SendEventResponse>, Status> {
        let req = request.into_inner();

        let event = req
            .event
            .ok_or_else(|| Status::invalid_argument("event is required"))?;

        let daemon_event = proto_event_to_daemon_event(event)?;

        info!(?daemon_event, "received control event");
        self.handle.emit(daemon_event);

        Ok(Response::new(SendEventResponse {}))
    }
}

/// Convert a proto event to a daemon event.
fn proto_event_to_daemon_event(event: Event) -> Result<DaemonEvent, Status> {
    match event {
        Event::HistoryPruned(_) => Ok(DaemonEvent::HistoryPruned),
        Event::HistoryRebuilt(_) => Ok(DaemonEvent::HistoryRebuilt),
        Event::HistoryDeleted(e) => Ok(DaemonEvent::HistoryDeleted {
            ids: e.ids.into_iter().map(HistoryId).collect(),
        }),
        Event::ForceSync(_) => Ok(DaemonEvent::ForceSync),
        Event::SettingsReloaded(_) => Ok(DaemonEvent::SettingsReloaded),
        Event::Shutdown(_) => Ok(DaemonEvent::ShutdownRequested),
    }
}