/**
 * The notification routes, all for the caller's own notifications.
 *
 * - `GET /api/notifications?page=&limit=` — signed in. Answers a page of them,
 *   newest first.
 * - `POST /api/notifications/read-all` — signed in. Marks them all read.
 * - `PATCH /api/notifications/:id/read` — signed in. Marks one read.
 *
 * @module
 */

import { Router } from "@oak/oak";
import {
  APIErrorCode,
  type APIResponse,
  type PaginatedData,
} from "../../shared/api.ts";
import { APIException } from "../lib/api-exception.ts";
import type { Notification } from "../../shared/notification.ts";
import { parsePagination } from "../lib/pagination.ts";
import { type AuthContext, authMiddleware } from "../middleware/auth.ts";
import {
  getNotificationsForUser,
  markAllRead,
  markOneRead,
} from "../services/notification-service.ts";

/** The router serving the endpoints the module doc lists. */
const router: Router = new Router({ prefix: "/api/notifications" });

router.get("/", authMiddleware, (ctx: AuthContext) => {
  if (!ctx.state.user) {
    throw new APIException(APIErrorCode.UNAUTHORIZED, 401, "Not authenticated");
  }
  const { page, limit } = parsePagination(ctx.request.url.searchParams);
  const { items, hasMore } = getNotificationsForUser(
    ctx.state.user.userId,
    page,
    limit,
  );
  const responseBody: APIResponse<PaginatedData<Notification>> = {
    success: true,
    data: { items, hasMore },
  };
  ctx.response.body = responseBody;
});

router.post("/read-all", authMiddleware, (ctx: AuthContext) => {
  if (!ctx.state.user) {
    throw new APIException(APIErrorCode.UNAUTHORIZED, 401, "Not authenticated");
  }
  markAllRead(ctx.state.user.userId);
  ctx.response.status = 204;
});

router.patch("/:id/read", authMiddleware, (ctx) => {
  const user = ctx.state.user;
  if (!user) {
    throw new APIException(APIErrorCode.UNAUTHORIZED, 401, "Not authenticated");
  }
  markOneRead(ctx.params.id, user.userId);
  ctx.response.status = 204;
});

export default router;