use export::http::{Path, Query, State};
use export::rest::AppResponseData;
use token::Session;

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

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

#[utoipa::path(
    get,
    path = "/repos/{space_name}/{repo_name}/conflicts",
    tag = "conflicts",
    description = "检测两个修订合并时是否冲突，并返回可快进标记。",
    params(crate::handler::RepoPath, GetConflictsQuery),
    responses(
        (status = 200, description = "merge conflict status", body = AppResponseData<MergeStatusDto>)
    )
)]
pub async fn get_conflicts(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<crate::handler::RepoPath>,
    Query(q): Query<GetConflictsQuery>,
) -> Result<AppResponseData<MergeStatusDto>, ApiError> {
    let _ = handler::resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?;
    let out = match q.ancestor {
        Some(ancestor) => {
            service
                .conflict_check_threeway(path.space_name, path.repo_name, q.base, q.head, ancestor)
                .await
        }
        None => {
            service
                .conflict_check(path.space_name, path.repo_name, q.base, q.head)
                .await
        }
    }
    .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}