(function () {
  const iframe = document.getElementById('ihm');
  const logEl = document.getElementById('log');
  const accessEl = document.getElementById('accessToken');
  const refreshEl = document.getElementById('refreshToken');
  const lastTypeEl = document.getElementById('lastType');

  /**
   * Logging util
   */
  function log(line) {
    const ts = new Date().toISOString();
    logEl.textContent += `[${ts}] ${line}\n`;
    logEl.scrollTop = logEl.scrollHeight;
  }

  /**
   * Parent → iframe: envoi d’un message typé
   */
  function sendToIframe(obj) {
    if (!iframe || !iframe.contentWindow) {
      log('iframe non prêt');
      return;
    }
    iframe.contentWindow.postMessage(obj, window.origin);
  }

  /**
   * Réception côté parent
   */
  window.addEventListener('message', (event) => {
    try {
      const data = event.data || {};
      if (!data || typeof data !== 'object') return;
      if (!data.type) return;
      lastTypeEl.value = String(data.type);
      if (data.type === 'LINK_ACCEPTED') {
        if (data.accessToken) accessEl.value = data.accessToken;
        if (data.refreshToken) refreshEl.value = data.refreshToken;
      }
      log(`← ${JSON.stringify(data)}`);
    } catch (e) {
      log(`Erreur réception: ${String(e)}`);
    }
  });

  /**
   * Actions UI
   */
  document.getElementById('btn-link').addEventListener('click', () => {
    const msg = { type: 'REQUEST_LINK', messageId: 'host-req-1' };
    log(`→ ${JSON.stringify(msg)}`);
    sendToIframe(msg);
  });

  document.getElementById('btn-validate').addEventListener('click', () => {
    const msg = { type: 'VALIDATE_TOKEN', accessToken: accessEl.value, refreshToken: refreshEl.value, messageId: 'host-val-1' };
    log(`→ ${JSON.stringify(msg)}`);
    sendToIframe(msg);
  });

  document.getElementById('btn-renew').addEventListener('click', () => {
    const msg = { type: 'RENEW_TOKEN', refreshToken: refreshEl.value, messageId: 'host-renew-1' };
    log(`→ ${JSON.stringify(msg)}`);
    sendToIframe(msg);
  });
})();