(() => {
  const SOURCE = "peach-firefox-sender-probe";
  const ALLOWED_TYPES = new Set(["GET_ENTRIES", "GET_RECOVERY_WORDS", "GET_SETTINGS"]);

  window.addEventListener("message", async (event) => {
    if (event.source !== window || event.data?.source !== SOURCE) return;
    const { id, message } = event.data;
    if (typeof id !== "string" || !message || !ALLOWED_TYPES.has(message.type)) return;

    let response;
    try {
      response = await chrome.runtime.sendMessage(message);
    } catch (error) {
      response = { ok: false, error: String(error) };
    }
    window.postMessage({ source: SOURCE, id, response }, window.location.origin);
  });
})();