use crate::error::AppError;
use crate::service::RepoService;
use crate::session::Session;
use futures_util::StreamExt;

impl RepoService {
    pub async fn git_get_raw_blob(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        revision: &str,
        path: &str,
    ) -> Result<Vec<u8>, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        self.ensure_repo_readable(user_uid, &repo).await?;
        let ws = self.resolve_workspace(wk_name).await?;
        let header = self.repo_header(&repo, &ws);
        let mut svc = self.git_client(&repo)?.tree;
        let mut stream = svc
            .get_raw_blob(tonic::Request::new(crate::pb::repo::GetRawBlobRequest {
                repository: Some(header),
                revision: Some(crate::pb::repo::ObjectSelector {
                    selector: Some(crate::pb::repo::object_selector::Selector::Revision(
                        crate::pb::repo::ObjectName {
                            revision: revision.to_string(),
                        },
                    )),
                }),
                path: path.to_string(),
                oid: None,
            }))
            .await
            .map_err(|e| AppError::InternalServerError(e.to_string()))?
            .into_inner();

        let mut data = Vec::new();
        while let Some(Ok(chunk)) = stream.next().await {
            data.extend_from_slice(&chunk.data);
        }
        Ok(data)
    }

    pub async fn git_get_file_metadata(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        revision: &str,
        path: &str,
    ) -> Result<crate::pb::repo::FileMetadata, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        self.ensure_repo_readable(user_uid, &repo).await?;
        let ws = self.resolve_workspace(wk_name).await?;
        let header = self.repo_header(&repo, &ws);
        let mut svc = self.git_client(&repo)?.tree;
        let resp = svc
            .get_file_metadata(tonic::Request::new(
                crate::pb::repo::GetFileMetadataRequest {
                    repository: Some(header),
                    revision: Some(crate::pb::repo::ObjectSelector {
                        selector: Some(crate::pb::repo::object_selector::Selector::Revision(
                            crate::pb::repo::ObjectName {
                                revision: revision.to_string(),
                            },
                        )),
                    }),
                    path: path.to_string(),
                },
            ))
            .await
            .map_err(|e| AppError::InternalServerError(e.to_string()))?;
        Ok(resp.into_inner())
    }

    pub async fn git_find_files(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        revision: &str,
        pattern: &str,
    ) -> Result<crate::pb::repo::FindFilesResponse, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        self.ensure_repo_readable(user_uid, &repo).await?;
        let ws = self.resolve_workspace(wk_name).await?;
        let header = self.repo_header(&repo, &ws);
        let mut svc = self.git_client(&repo)?.tree;
        let resp = svc
            .find_files(tonic::Request::new(crate::pb::repo::FindFilesRequest {
                repository: Some(header),
                revision: Some(crate::pb::repo::ObjectSelector {
                    selector: Some(crate::pb::repo::object_selector::Selector::Revision(
                        crate::pb::repo::ObjectName {
                            revision: revision.to_string(),
                        },
                    )),
                }),
                pattern: pattern.to_string(),
                pathspec: vec![],
                pagination: None,
            }))
            .await
            .map_err(|e| AppError::InternalServerError(e.to_string()))?;
        Ok(resp.into_inner())
    }

    pub async fn git_get_tree(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        revision: &str,
        path: &str,
    ) -> Result<crate::pb::repo::Tree, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        self.ensure_repo_readable(user_uid, &repo).await?;
        let ws = self.resolve_workspace(wk_name).await?;
        let header = self.repo_header(&repo, &ws);
        let mut svc = self.git_client(&repo)?.tree;
        let resp = svc
            .get_tree(tonic::Request::new(crate::pb::repo::GetTreeRequest {
                repository: Some(header),
                revision: Some(crate::pb::repo::ObjectSelector {
                    selector: Some(crate::pb::repo::object_selector::Selector::Revision(
                        crate::pb::repo::ObjectName {
                            revision: revision.to_string(),
                        },
                    )),
                }),
                path: path.to_string(),
            }))
            .await
            .map_err(|e| AppError::InternalServerError(e.to_string()))?;
        Ok(resp.into_inner())
    }
}