/**
 * Builds the Oak application and, when run directly, starts the recurring
 * jobs and listens on {@link LISTEN_HOST}:{@link PORT}. A request goes
 * through the error middleware, the OG tags and CORS, then the routers, one
 * per resource of the API (`API.md` lists them), and last the built frontend,
 * which answers every path no router did.
 *
 * @module
 */

import { Application } from "@oak/oak";
import { oakCors } from "@tajpouria/cors";

import attachmentsRouter from "./routes/attachments.ts";
import avatarsRouter from "./routes/avatars.ts";
import categoriesRouter from "./routes/categories.ts";
import chatRouter from "./routes/chat.ts";
import communityRouter from "./routes/community.ts";
import commentsRouter from "./routes/comments.ts";
import dumpsRouter from "./routes/dumps.ts";
import filesRouter from "./routes/files.ts";
import followsRouter from "./routes/follows.ts";
import invitesRouter from "./routes/invites.ts";
import meRouter from "./routes/me.ts";
import notificationsRouter from "./routes/notifications.ts";
import passwordResetsRouter from "./routes/password-resets.ts";
import playlistsRouter from "./routes/playlists.ts";
import remoteRouter from "./routes/remote.ts";
import searchRouter from "./routes/search.ts";
import sessionsRouter from "./routes/sessions.ts";
import thumbnailsRouter from "./routes/thumbnails.ts";
import waveformsRouter from "./routes/waveforms.ts";
import unsubscribeRouter from "./routes/unsubscribe.ts";
import usersRouter from "./routes/users.ts";
import wsRouter from "./routes/ws.ts";

import { ALLOWED_ORIGINS, LISTEN_HOST, PORT, PUBLIC_URL } from "./config.ts";
import { errorMiddleware } from "./middleware/error.ts";
import { ogMiddleware } from "./middleware/og.ts";
import { routeStaticFilesFrom } from "./lib/static.ts";
import { startJobs } from "./lib/scheduler.ts";
import { rateLimitSweepJob } from "./lib/rate-limit.ts";
import { digestJob } from "./services/digest-service.ts";
import { communityJob } from "./services/community-service.ts";
import { pingJob, typingExpiryJob } from "./services/ws-service.ts";

/**
 * The whole server, exported so the tests' helpers can send it requests
 * without listening.
 */
const app: Application = new Application();

const cors = oakCors({ origin: ALLOWED_ORIGINS });

app.use(errorMiddleware);
app.use(ogMiddleware);
// oakCors calls next() without awaiting it when there is no origin, which
// corrupts the response in Oak's async chain. So it only sees requests from an
// allowed origin, and the others get no CORS headers.
app.use(async (ctx, next) => {
  const origin = ctx.request.headers.get("origin");
  if (origin && ALLOWED_ORIGINS.includes(origin)) {
    return await cors(ctx, next);
  }
  await next();
});
for (
  const router of [
    meRouter,
    followsRouter,
    notificationsRouter,
    avatarsRouter,
    usersRouter,
    sessionsRouter,
    passwordResetsRouter,
    unsubscribeRouter,
    dumpsRouter,
    filesRouter,
    thumbnailsRouter,
    waveformsRouter,
    commentsRouter,
    playlistsRouter,
    categoriesRouter,
    searchRouter,
    chatRouter,
    communityRouter,
    invitesRouter,
    attachmentsRouter,
    remoteRouter,
    wsRouter,
  ]
) {
  app.use(router.routes(), router.allowedMethods());
}
app.use(routeStaticFilesFrom([
  `${Deno.cwd()}/dist`,
  `${Deno.cwd()}/public`,
]));

app.addEventListener(
  "listen",
  () => console.log(`Server listening on ${PUBLIC_URL}`),
);

app.addEventListener(
  "error",
  (e) => console.log(`Uncaught error: ${e.message}`),
);

if (import.meta.main) {
  startJobs([
    digestJob,
    communityJob,
    pingJob,
    typingExpiryJob,
    rateLimitSweepJob,
  ]);
  await app.listen({ hostname: LISTEN_HOST, port: PORT });
}

export { app };