use axum::extract::{Path, Query, State};
use export::rest::AppResponseData;
use gitbaby::commit::types::TreeEntry;
use session::Session;

use crate::errors::{ApiError, GitApiError};
use crate::handler::resolve_reader;
use crate::service::GitService;

#[derive(Debug, Clone, serde::Serialize)]
pub struct TreeFollowResponse {
    pub entry: TreeEntry,
    pub symlink_target: Option<String>,
    pub target_entry: Option<TreeEntry>,
}

#[derive(Debug, Clone, serde::Deserialize, utoipa::IntoParams)]
pub struct TreeFollowQuery {
    pub revision: String,
    pub path: String,
}

#[utoipa::path(
    get,
    path = "/repos/{space_name}/{repo_name}/tree/follow",
    tag = "trees",
    params(
        crate::handler::RepoPath,
        TreeFollowQuery,
    ),
    responses(
        (status = 200, description = "follow tree entry through symlink")
    )
)]
pub async fn tree_follow(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<crate::handler::RepoPath>,
    Query(q): Query<TreeFollowQuery>,
) -> Result<AppResponseData<TreeFollowResponse>, ApiError> {
    let _ = resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?;
    let (entry, symlink_target, target_entry) = service
        .tree_follow(path.space_name, path.repo_name, q.revision, q.path)
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(TreeFollowResponse {
        entry,
        symlink_target,
        target_entry,
    }))
}