use axum::Json;
use axum::extract::{Path, Query, State};
use export::rest::AppResponseData;
use models::common::watch_mode::WatchMode;
use serde::Deserialize;
use session_layer::Session;
use utoipa::IntoParams;

use crate::errors::{ApiError, GitApiError};
use crate::handler::{RepoPath, resolve_reader};
use crate::service::GitService;
use crate::service::watches::{RepoWatchDto, UpsertWatchCmd, WatcherDto};

#[derive(Debug, Clone, Deserialize, IntoParams)]
pub struct WatchQuery {
    pub limit: Option<u64>,
    pub offset: Option<u64>,
    pub mode: Option<WatchMode>,
}

#[utoipa::path(
    put,
    path = "/repos/{space_name}/{repo_name}/watch",
    tag = "repos",
    description = "设置或更新当前用户对仓库的关注、不关注或忽略模式。",
    params(RepoPath),
    request_body = UpsertWatchCmd,
    responses(
        (status = 200, description = "upsert watch", body = AppResponseData<RepoWatchDto>)
    )
)]
pub async fn upsert_watch(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<RepoPath>,
    Json(cmd): Json<UpsertWatchCmd>,
) -> Result<AppResponseData<RepoWatchDto>, ApiError> {
    let (ctx, viewer) = resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?;
    let uid = viewer.ok_or_else(|| ApiError::from(GitApiError::Unauthorized))?;
    let out = service
        .upsert_watch(&ctx, uid, cmd)
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}

#[utoipa::path(
    get,
    path = "/repos/{space_name}/{repo_name}/watchers",
    tag = "repos",
    description = "分页列出仓库关注者，并可按关注模式过滤。",
    params(RepoPath, WatchQuery),
    responses(
        (status = 200, description = "list watchers", body = AppResponseData<Vec<WatcherDto>>)
    )
)]
pub async fn list_watchers(
    State(service): State<GitService>,
    session: Session,
    Path(path): Path<RepoPath>,
    Query(q): Query<WatchQuery>,
) -> Result<AppResponseData<Vec<WatcherDto>>, ApiError> {
    let ctx = resolve_reader(
        &service,
        &session,
        path.space_name.clone(),
        path.repo_name.clone(),
    )
    .await?
    .0;
    let limit = q.limit.unwrap_or(50).clamp(1, 100);
    let offset = q
        .offset
        .unwrap_or(0)
        .clamp(0, export::pagination::MAX_OFFSET);
    let out = service
        .list_watchers(&ctx, q.mode, limit, offset)
        .await
        .map_err(GitApiError::from)?;
    Ok(AppResponseData::ok(out))
}