const express = require('express');
const fs = require('fs');
const http = require('http');
const path = require('path');
const common = require('./common');
const { createPlayerRuntime } = require('./player/runtime');
const { createPlayerPlaylistService } = require('./player/playlist');
const { createRtmpStreamService } = require('./player/modules/rtmp-streams');
const { normalizeDeviceId, registerPlayerOnboardingRoutes, commitDeviceBinding } = require('./player/onboarding');
const { createOnboardingStore } = require('./player/onboarding/store');
const { registerPlayerRoutes } = require('./player/routes');
const { pruneStaleOnboardingDevices } = require('./db');


// Player runtime, media API, and websocket wiring.
async function start() {
  const app = express();
  const pool = common.createPool();
  const PORT = Number(process.env.PLAYER_PORT || 3001);
  const ASSET_DIR = path.join(__dirname, 'player', 'public');
  const MEDIA_DIR = path.join(__dirname, '..', 'media');
  const ONBOARDING_QUEUE_FILE = path.join(MEDIA_DIR, 'player-onboarding-queue.json');
  const DB_SYNC_INTERVAL_MS = Number(process.env.PLAYER_DB_SYNC_INTERVAL_MS || 15000);
  const onboardingStore = createOnboardingStore(ONBOARDING_QUEUE_FILE);
  const playerRuntime = createPlayerRuntime({
    pool: pool,
    normalizeDeviceId: normalizeDeviceId
  });
  const playerPlaylistService = createPlayerPlaylistService({
    pool: pool,
    common: common,
    snapshotDir: path.join(MEDIA_DIR, 'player-cache', 'screen-playlists')
  });
  const rtmpStreamService = createRtmpStreamService({
    mediaDir: MEDIA_DIR
  });
  const server = http.createServer(app);
  playerRuntime.installWebsocket(server);
  app.use(express.json());
  registerPlayerOnboardingRoutes(app, {
    pool: pool,
    common: common,
    playerRuntime: playerRuntime,
    onboardingStore: onboardingStore,
    QRCode: require('qrcode')
  });
  registerPlayerRoutes(app, {
    pool: pool,
    common: common,
    mediaDir: MEDIA_DIR,
    assetDir: ASSET_DIR,
    playerRuntime: playerRuntime,
    playerPlaylistService: playerPlaylistService,
    rtmpStreamService: rtmpStreamService
  });

  app.use(function (error, _req, res, _next) {
    console.error(error);
    res.status(error.statusCode || 500).send(error.statusCode ? error.message : 'Internal server error');
  });

  fs.mkdirSync(MEDIA_DIR, { recursive: true });

  server.listen(PORT, function () {
    console.log(`Pulse Signage app listening on port ${PORT}`);
  });

  async function syncDatabaseState() {
    try {
      await common.ensureSchema(pool, { mediaDir: MEDIA_DIR });

      if (playerRuntime.snapshotAllConnections().length > 0) {
        await pruneStaleOnboardingDevices(pool);
      }

      await onboardingStore.flushBindings(function (entry) {
        return commitDeviceBinding(
          pool,
          entry.deviceId,
          entry.clientName,
          entry.screenSlug,
          playerRuntime.isClientNameAvailableOnScreen,
          playerRuntime.snapshotAllConnections()
        );
      });
    } catch (error) {
      console.error(error);
    }
  }

  await syncDatabaseState();
  setInterval(function () {
    syncDatabaseState().catch(function (error) {
      console.error(error);
    });
  }, DB_SYNC_INTERVAL_MS);
}

module.exports = { start };

if (require.main === module) {
  start().catch(function (error) {
    console.error(error);
    process.exit(1);
  });
}