use crate::pb::commit_service_client::CommitServiceClient;
use crate::pb::*;

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

remote_client!(
    remote_commit_client,
    CommitServiceClient<tonic::transport::Channel>,
    "commit"
);

#[tonic::async_trait]
impl commit_service_server::CommitService for GitksService {
    async fn list_commits(
        &self,
        request: tonic::Request<ListCommitsRequest>,
    ) -> Result<tonic::Response<ListCommitsResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/ListCommits");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let repo = self.repo_label(inner.repository.as_ref());
        let span = tracing::info_span!("commit.list_commits", %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_commit_client(self, inner.repository.as_ref(), false).await?
                {
                    m.record("ok");
                    return client.list_commits(inner).await;
                }
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
            Err(err) => {
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
        };
        let resp = if !inner.all && cache::selector_is_oid(&inner.revision) {
            cache::cached_response("commit.list_commits", &inner, || {
                gb.list_commits(inner.clone()).map_err(into_status)
            })?
        } else {
            gb.list_commits(inner).map_err(into_status)?
        };
        tracing::info!(%repo, count = resp.commits.len(), total = resp.page_info.as_ref().map(|p| p.total_count).unwrap_or(0), "list_commits done");
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn get_commit(
        &self,
        request: tonic::Request<GetCommitRequest>,
    ) -> Result<tonic::Response<Commit>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/GetCommit");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let repo = self.repo_label(inner.repository.as_ref());
        let span = tracing::info_span!("commit.get_commit", %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_commit_client(self, inner.repository.as_ref(), false).await?
                {
                    m.record("ok");
                    return client.get_commit(inner).await;
                }
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
            Err(err) => {
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
        };
        let resp = if cache::selector_is_oid(&inner.revision) {
            cache::cached_response("commit.get_commit", &inner, || {
                gb.get_commit(inner.clone()).map_err(into_status)
            })?
        } else {
            gb.get_commit(inner).map_err(into_status)?
        };
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn get_commit_ancestors(
        &self,
        request: tonic::Request<GetCommitAncestorsRequest>,
    ) -> Result<tonic::Response<GetCommitAncestorsResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/GetCommitAncestors");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let repo = self.repo_label(inner.repository.as_ref());
        let span = tracing::info_span!("commit.get_commit_ancestors", %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_commit_client(self, inner.repository.as_ref(), false).await?
                {
                    m.record("ok");
                    return client.get_commit_ancestors(inner).await;
                }
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
            Err(err) => {
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
        };
        let resp = if cache::selector_is_oid(&inner.revision) {
            cache::cached_response("commit.get_commit_ancestors", &inner, || {
                gb.get_commit_ancestors(inner.clone()).map_err(into_status)
            })?
        } else {
            gb.get_commit_ancestors(inner).map_err(into_status)?
        };
        tracing::info!(%repo, count = resp.commits.len(), "get_commit_ancestors done");
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn create_commit(
        &self,
        request: tonic::Request<CreateCommitRequest>,
    ) -> Result<tonic::Response<CreateCommitResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/CreateCommit");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let repo = self.repo_label(inner.repository.as_ref());
        let branch = inner.branch.clone();
        let span = tracing::info_span!("commit.create_commit", %repo, %branch);
        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_commit_client(self, inner.repository.as_ref(), true).await?
                {
                    m.record("ok");
                    return client.create_commit(inner).await;
                }
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
            Err(err) => {
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
        };
        let resp = gb.create_commit(inner).map_err(into_status)?;
        let commit_hex = resp
            .commit
            .as_ref()
            .and_then(|c| c.oid.as_ref().map(|o| o.hex.as_str()).or(Some("?")))
            .unwrap_or("?");
        tracing::info!(%repo, %branch, %commit_hex, "commit created");
        self.notify_ref_update(&repo, &format!("refs/heads/{}", branch), "", "");
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn revert_commit(
        &self,
        request: tonic::Request<RevertCommitRequest>,
    ) -> Result<tonic::Response<CreateCommitResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/RevertCommit");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let repo = self.repo_label(inner.repository.as_ref());
        let branch = inner.branch.clone();
        let span = tracing::info_span!("commit.revert_commit", %repo, %branch);
        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_commit_client(self, inner.repository.as_ref(), true).await?
                {
                    m.record("ok");
                    return client.revert_commit(inner).await;
                }
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
            Err(err) => {
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
        };
        let resp = gb.revert_commit(inner).map_err(into_status)?;
        tracing::info!(%repo, %branch, "commit reverted");
        self.notify_ref_update(&repo, &format!("refs/heads/{}", branch), "", "");
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn cherry_pick_commit(
        &self,
        request: tonic::Request<CherryPickCommitRequest>,
    ) -> Result<tonic::Response<CreateCommitResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/CherryPickCommit");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let repo = self.repo_label(inner.repository.as_ref());
        let branch = inner.branch.clone();
        let span = tracing::info_span!("commit.cherry_pick_commit", %repo, %branch);
        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_commit_client(self, inner.repository.as_ref(), true).await?
                {
                    m.record("ok");
                    return client.cherry_pick_commit(inner).await;
                }
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
            Err(err) => {
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
        };
        let resp = gb.cherry_pick_commit(inner).map_err(into_status)?;
        tracing::info!(%repo, %branch, "commit cherry-picked");
        self.notify_ref_update(&repo, &format!("refs/heads/{}", branch), "", "");
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn compare_commits(
        &self,
        request: tonic::Request<CompareCommitsRequest>,
    ) -> Result<tonic::Response<CompareCommitsResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/CompareCommits");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let repo = self.repo_label(inner.repository.as_ref());
        let span = tracing::info_span!("commit.compare_commits", %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_commit_client(self, inner.repository.as_ref(), false).await?
                {
                    m.record("ok");
                    return client.compare_commits(inner).await;
                }
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
            Err(err) => {
                crate::metrics::record_rpc_error(&m, &err);
                return Err(err);
            }
        };
        let resp = if cache::selectors_are_oid(&inner.base, &inner.head) {
            cache::cached_response("commit.compare_commits", &inner, || {
                gb.compare_commits(inner.clone()).map_err(into_status)
            })?
        } else {
            gb.compare_commits(inner).map_err(into_status)?
        };
        tracing::info!(%repo, count = resp.commits.len(), "compare_commits done");
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }


    async fn find_commit(
        &self,
        request: tonic::Request<FindCommitRequest>,
    ) -> Result<tonic::Response<Commit>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/FindCommit");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.find_commit(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn list_commits_by_oid(
        &self,
        request: tonic::Request<ListCommitsByOidRequest>,
    ) -> Result<tonic::Response<ListCommitsByOidResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/ListCommitsByOid");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.list_commits_by_oid(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn commit_is_ancestor(
        &self,
        request: tonic::Request<CommitIsAncestorRequest>,
    ) -> Result<tonic::Response<CommitIsAncestorResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/CommitIsAncestor");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.commit_is_ancestor(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn check_objects_exist(
        &self,
        request: tonic::Request<CheckObjectsExistRequest>,
    ) -> Result<tonic::Response<CheckObjectsExistResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/CheckObjectsExist");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.check_objects_exist(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn commits_by_message(
        &self,
        request: tonic::Request<CommitsByMessageRequest>,
    ) -> Result<tonic::Response<CommitsByMessageResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/CommitsByMessage");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.commits_by_message(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn get_commit_stats(
        &self,
        request: tonic::Request<GetCommitStatsRequest>,
    ) -> Result<tonic::Response<CommitStats>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/GetCommitStats");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.get_commit_stats(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn last_commit_for_path(
        &self,
        request: tonic::Request<LastCommitForPathRequest>,
    ) -> Result<tonic::Response<LastCommitForPathResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/LastCommitForPath");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.last_commit_for_path(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }


    async fn count_commits(
        &self,
        request: tonic::Request<CountCommitsRequest>,
    ) -> Result<tonic::Response<CountCommitsResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/CountCommits");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.count_commits(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }

    async fn count_diverging_commits(
        &self,
        request: tonic::Request<CountDivergingCommitsRequest>,
    ) -> Result<tonic::Response<CountDivergingCommitsResponse>, tonic::Status> {
        let m = crate::metrics::RequestMetrics::new("gitks.CommitService/CountDivergingCommits");
        let inner = request.into_inner();
        let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
        let gb = self.resolve(inner.repository.as_ref())?;
        let resp = gb.count_diverging_commits(inner).map_err(into_status)?;
        m.record("ok");
        Ok(tonic::Response::new(resp))
    }
}