use crate::rpcgit::diff::types::RangeDiffSpec;
use ::session::Session;
use export::http::{Path, Query, State};
use export::rest::AppResponseData;

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

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

#[utoipa::path(
    get,
    path = "/repos/{space_name}/{repo_name}/diff/range",
    tag = "diffs",
    description = "返回提交区间差异，并可用公共基线执行三点式比较。",
    params(crate::handler::RepoPath, RangeDiffQuery),
    responses(
        (status = 200, description = "range diff", body = AppResponseData<String>)
    )
)]
pub async fn range_diff(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<crate::handler::RepoPath>,
    Query(q): Query<RangeDiffQuery>,
) -> Result<AppResponseData<String>, ApiError> {
    let body = match q.base {
        Some(base) => RangeDiffSpec::BaseWithRevisions(base, q.from, q.to),
        None => RangeDiffSpec::RevisionRange(q.from, q.to),
    };
    let (ctx, _) = handler::resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?;
    let out = service
        .range_diff(&ctx, body)
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}