'use strict';

// go2rtc Player-Modi – Fallback-Reihenfolge: WebRTC → MSE → MJPEG
const MODE = 'webrtc,mse,mjpeg';

// ── Logging (sichtbar in Browser DevTools → Console → F12) ──────────────────
const P = '[WebcamViewer]';
const log  = (c, m)    => console.log(`${P}[${c}] ${m}`);
const warn = (c, m)    => console.warn(`${P}[${c}] ⚠ ${m}`);
const err  = (c, m, e) => console.error(`${P}[${c}] ✗ ${m}`, e ?? '');

// ── Kamera-View aufbauen ─────────────────────────────────────────────────────
function buildCamera(camId, go2rtcPort, container) {
  // WebSocket direkt zu go2rtc – kein Proxy-Zwischenschritt, garantiert stabil.
  // Protokoll: ws:// auf LAN (http). Für Internet mit TLS wird aus ws: wss: (Caddy).
  const wsUrl = `ws://${location.hostname}:${go2rtcPort}/api/ws?src=${encodeURIComponent(camId)}`;
  log(camId, `View erstellt  mode="${MODE}"  ws=${wsUrl}`);

  const box = document.createElement('div');
  box.className = 'cam-box';

  const stream = document.createElement('video-stream');
  stream.mode  = MODE;

  // Events vom inneren <video>-Element (capture-Phase)
  stream.addEventListener('play',    ()  => log(camId,  '▶ spielt'),              true);
  stream.addEventListener('playing', ()  => log(camId,  '▶ Bild läuft'),          true);
  stream.addEventListener('pause',   ()  => warn(camId, 'pausiert'),              true);
  stream.addEventListener('stalled', ()  => warn(camId, 'stalled (keine Daten)'), true);
  stream.addEventListener('waiting', ()  => warn(camId, 'waiting (Buffer leer)'), true);
  stream.addEventListener('error',   (e) => err(camId,  'Video-Fehler', e),       true);

  log(camId, `Verbinde WebSocket → ${wsUrl}`);
  stream.src = wsUrl;   // setzt den VideoRTC-src und startet die Verbindung

  box.appendChild(stream);

  const label = document.createElement('div');
  label.className   = 'cam-label';
  label.textContent = camId;
  box.appendChild(label);

  const actions = document.createElement('div');
  actions.className = 'cam-actions';
  const snapBtn = document.createElement('button');
  snapBtn.textContent = 'Snapshot';
  snapBtn.onclick = () => {
    log(camId, `Snapshot → /api/snapshot/${camId}`);
    const a = document.createElement('a');
    a.href = `/api/snapshot/${camId}`;
    a.download = `${camId}_${Date.now()}.jpg`;
    a.click();
  };
  actions.appendChild(snapBtn);
  box.appendChild(actions);

  container.appendChild(box);
}

// ── Init ─────────────────────────────────────────────────────────────────────
async function init() {
  log('init', 'Starte...');

  // go2rtc-Port vom Server holen (damit er nicht im Client hart kodiert ist)
  let go2rtcPort = 1984;
  try {
    const r = await fetch('/config.json');
    const d = await r.json();
    go2rtcPort = d.go2rtcPort ?? 1984;
    log('init', `go2rtc WebSocket-Port: ${go2rtcPort}`);
  } catch (e) {
    warn('init', `Konnte /config.json nicht laden, nehme Port ${go2rtcPort}`);
  }

  // go2rtc Web-Component muss geladen sein bevor .src gesetzt wird
  try {
    await customElements.whenDefined('video-stream');
    log('init', '<video-stream> definiert');
  } catch (e) {
    err('init', '<video-stream> nicht geladen – /video-stream.js erreichbar?', e);
    return;
  }

  const container  = document.getElementById('cameras');
  const statusText = document.getElementById('statusText');

  // Kamera-Liste von go2rtc via Node-Proxy
  let cams = [];
  try {
    const r = await fetch('/api/snapshot');
    log('init', `/api/snapshot → HTTP ${r.status}`);
    if (r.ok) {
      const d = await r.json();
      cams = (d.cameras ?? []).map(c => c.id);
      log('init', `Kameras: ${cams.join(', ') || '(keine)'}`);
    }
  } catch (e) {
    err('init', '/api/snapshot Fehler – Fallback', e);
  }

  if (cams.length === 0) {
    warn('init', 'Fallback auf cam0, cam1');
    cams = ['cam0', 'cam1'];
  }

  cams.forEach(id => buildCamera(id, go2rtcPort, container));
  statusText.textContent = `${cams.length} Kamera${cams.length !== 1 ? 's' : ''} · WebRTC`;
  log('init', 'Fertig');
}

init();