use ::session::OptionalUser;
use api::http::{Path, Query, State};
use api::rest::AppResponseData;

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

#[derive(Debug, Clone, serde::Deserialize, utoipa::IntoParams)]
pub struct PatchGenerateQuery {
    pub base: String,
    pub head: String,
}

#[utoipa::path(
    get,
    path = "/repos/{space_name}/{repo_name}/patch/generate",
    tag = "patches",
    description = "基于两个修订生成可保存的补丁内容。",
    params(crate::handler::RepoPath, PatchGenerateQuery),
    responses(
        (status = 200, description = "generate patch", body = AppResponseData<PatchDto>)
    )
)]
pub async fn patch_generate(
    State(service): State<GitService>,
    OptionalUser(viewer): OptionalUser,
    Path(path): Path<crate::handler::RepoPath>,
    Query(q): Query<PatchGenerateQuery>,
) -> Result<AppResponseData<PatchDto>, ApiError> {
    let (ctx, _) = handler::resolve_reader(
        &service,
        viewer,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?;
    let out = service
        .patch_generate(&ctx, q.base, q.head)
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}