/**
 * Serves the figures of the client's `/community` page, which
 * `community-service.ts` recomputes on a timer.
 *
 * - `GET /api/community?period=weekly|monthly` — signed in. Answers the
 *   site's figures over the last week (by default) or month.
 *
 * @module
 */

import { Router } from "@oak/oak";
import type { APIResponse } from "../../shared/api.ts";
import type { CommunityStats } from "../../shared/community.ts";
import { isDigestCadence } from "../../shared/settings.ts";
import { APIException } from "../lib/api-exception.ts";
import { type AuthContext, authMiddleware } from "../middleware/auth.ts";
import { getCommunityStats } from "../services/community-service.ts";

/**
 * Mounted by `api/main.ts` behind the error, Open Graph and CORS middleware.
 * An `APIException` thrown by a handler becomes the JSON error response there.
 */
const router: Router = new Router({ prefix: "/api/community" });

router.get("/", authMiddleware, (ctx: AuthContext) => {
  const period = ctx.request.url.searchParams.get("period") ?? "weekly";
  if (!isDigestCadence(period)) {
    throw new APIException(400, "period must be weekly or monthly");
  }
  const responseBody: APIResponse<CommunityStats> = {
    success: true,
    data: getCommunityStats(period),
  };
  ctx.response.body = responseBody;
});

export default router;