use crate::pb::*;
use crate::pb::archive_service_client::ArchiveServiceClient;

use super::{GitksService, cache, into_status};

async fn remote_archive_client(
    svc: &GitksService,
    header: Option<&RepositoryHeader>,
    is_write: bool,
) -> Result<Option<ArchiveServiceClient<tonic::transport::Channel>>, tonic::Status> {
    let header = match header {
        Some(h) => h,
        None => return Ok(None),
    };
    let Some(route) = svc.route_repository(header, is_write).await? else {
        return Ok(None);
    };
    tracing::info!(storage_name = %route.storage_name, relative_path = %route.relative_path, actor_name = %route.actor_name, grpc_addr = %route.grpc_addr, "forwarding archive rpc");
    let endpoint = super::remote_endpoint(&route.grpc_addr).await?;
    let client = ArchiveServiceClient::connect(endpoint)
        .await
        .map_err(|e| tonic::Status::unavailable(e.to_string()))?;
    Ok(Some(client))
}

#[tonic::async_trait]
impl archive_service_server::ArchiveService for GitksService {
    type GetArchiveStream =
        tokio_stream::wrappers::ReceiverStream<Result<ArchiveChunk, tonic::Status>>;

    async fn get_archive(
        &self,
        request: tonic::Request<ArchiveRequest>,
    ) -> Result<tonic::Response<Self::GetArchiveStream>, tonic::Status> {
        let inner = request.into_inner();
        let repo = self.repo_label(inner.repository.as_ref());
        let span = tracing::info_span!("archive.get_archive", %repo);
        let _enter = span.enter();
        let gb = match self.resolve(inner.repository.as_ref()) {
            Ok(gb) => gb,
            Err(err) if err.code() == tonic::Code::NotFound => {
                if let Some(mut client) = remote_archive_client(self, inner.repository.as_ref(), false).await? {
                    let resp = client.get_archive(inner).await?;
                    let stream = super::bridge_server_stream(resp.into_inner());
                    return Ok(tonic::Response::new(stream));
                }
                return Err(err);
            }
            Err(err) => return Err(err),
        };
        let stream = gb.get_archive_stream(inner)?;
        tracing::info!(%repo, "archive streaming started");
        Ok(tonic::Response::new(stream))
    }

    async fn list_archive_entries(
        &self,
        request: tonic::Request<ListArchiveEntriesRequest>,
    ) -> Result<tonic::Response<ListArchiveEntriesResponse>, tonic::Status> {
        let inner = request.into_inner();
        let repo = self.repo_label(inner.repository.as_ref());
        let span = tracing::info_span!("archive.list_archive_entries", %repo);
        let _enter = span.enter();
        let gb = match self.resolve(inner.repository.as_ref()) {
            Ok(gb) => gb,
            Err(err) if err.code() == tonic::Code::NotFound => {
                if let Some(mut client) = remote_archive_client(self, inner.repository.as_ref(), false).await? {
                    return client.list_archive_entries(inner).await;
                }
                return Err(err);
            }
            Err(err) => return Err(err),
        };
        let resp = if cache::selector_is_oid(&inner.treeish) {
            cache::cached_response("archive.list_archive_entries", &inner, || {
                gb.list_archive_entries(inner.clone()).map_err(into_status)
            })?
        } else {
            gb.list_archive_entries(inner).map_err(into_status)?
        };
        tracing::info!(%repo, count = resp.entries.len(), "list_archive_entries done");
        Ok(tonic::Response::new(resp))
    }
}