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

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

#[derive(Debug, Clone, serde::Deserialize, utoipa::IntoParams)]
pub struct DiffTreeQuery {
    pub base: String,
    pub head: String,
    #[serde(default)]
    pub use_merge_base: Option<bool>,
}

#[utoipa::path(
    get,
    path = "/repos/{space_name}/{repo_name}/diff/tree",
    tag = "diffs",
    params(
        crate::handler::RepoPath,
        DiffTreeQuery,
    ),
    responses(
        (status = 200, description = "diff trees", body = AppResponseData<Vec<DiffTreeRecordDto>>)
    )
)]
pub async fn diff_tree(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<crate::handler::RepoPath>,
    Query(q): Query<DiffTreeQuery>,
) -> Result<AppResponseData<Vec<DiffTreeRecordDto>>, ApiError> {
    let _ = resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?;
    let out = service
        .diff_tree(
            path.space_name,
            path.repo_name,
            q.base,
            q.head,
            q.use_merge_base.unwrap_or(false),
        )
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}