'use strict';

const express = require('express');
const http = require('http');
const path = require('path');
const { CameraSwitch } = require('./src/cameraSwitch');
const { detectDevices } = require('./src/deviceDetect');
const { createSnapshotRouter, createStreamRouter } = require('./src/snapshotService');

const PORT = parseInt(process.env.PORT ?? '8444', 10);
const LIVE_SIZE = process.env.LIVE_SIZE ?? '640x480';
const LIVE_FPS = parseInt(process.env.LIVE_FPS ?? '30', 10);
const HIRES_SIZE = process.env.HIRES_SIZE ?? '1280x960';
const HIRES_FPS = parseInt(process.env.HIRES_FPS ?? '15', 10);

// ── Kameras: cam0 = erstes Gerät, cam1 = zweites … (DEV0/DEV1-Env überschreibt) ─
const devices = detectDevices();
const switches = {};
devices.forEach((device, i) => {
  const id = `cam${i}`;
  switches[id] = new CameraSwitch({ id, device, liveSize: LIVE_SIZE, liveFps: LIVE_FPS, hiresSize: HIRES_SIZE, hiresFps: HIRES_FPS });
});

const app = express();

// ── 1. Eigene Endpunkte ───────────────────────────────────────────────────────
app.use('/api/snapshot', createSnapshotRouter(switches));
app.use('/api/stream', createStreamRouter(switches));

app.get('/health', (_req, res) => {
  res.json({
    status: 'ok',
    cameras: Object.values(switches).map((sw) => ({
      id: sw.id, device: sw.device, state: sw.state, hasFrame: !!sw.latest,
    })),
  });
});

app.get('/config.json', (_req, res) => {
  res.json({ cameras: Object.keys(switches) });
});

// ── 2. Statische Dateien ──────────────────────────────────────────────────────
//  no-cache: Browser MUSS index.html/viewer.js vor Nutzung revalidieren.
app.use(express.static(path.join(__dirname, 'public'), {
  setHeaders: (res) => res.setHeader('Cache-Control', 'no-cache'),
}));

// ── 3. Start ──────────────────────────────────────────────────────────────────
const server = http.createServer(app);

server.listen(PORT, '0.0.0.0', () => {
  console.log(`AppRobotWebcam  http://0.0.0.0:${PORT}`);
  console.log(`  Kameras:      ${Object.entries(switches).map(([id, sw]) => `${id}=${sw.device}`).join(', ')}`);
  console.log(`  Live:         ${LIVE_SIZE}@${LIVE_FPS}  ·  HD-Grab: ${HIRES_SIZE}@${HIRES_FPS}`);
  console.log(`  Viewer:       http://0.0.0.0:${PORT}/`);
  console.log(`  Live-Stream:  http://0.0.0.0:${PORT}/api/stream/cam0`);
  console.log(`  Snapshot API: http://0.0.0.0:${PORT}/api/snapshot/cam0  (+ /hires)`);

  // Live-Producer starten (Dauerbetrieb)
  Object.values(switches).forEach((sw) => sw.start());
});

const shutdown = (sig) => {
  console.log(`\n${sig} – shutting down`);
  Object.values(switches).forEach((sw) => { sw.stopping = true; if (sw.proc) { try { sw.proc.kill('SIGKILL'); } catch (_e) {} } });
  server.close(() => process.exit(0));
  setTimeout(() => process.exit(0), 3000); // Sicherheitsnetz
};
process.on('SIGINT', () => shutdown('SIGINT'));
process.on('SIGTERM', () => shutdown('SIGTERM'));