export default {
  async email(message, env, ctx) {
    const from = message.from.toLowerCase();
    const subject = (message.headers.get("subject") || "").toLowerCase();

    // Allow important Amazon hold/restriction emails
    const allowAmazonHold =
      from.includes("amazon") &&
      (
        subject.includes("account is temporarily on hold") ||
        subject.includes("sign in to resolve")
      );

    if (allowAmazonHold) {
      await message.forward("YOUR MASTERMAIL");
      return;
    }

    // Rule 1: Amazon + invitation request received
    const blockAmazonInvitation =
      from.includes("amazon") &&
      subject.includes("invitation request received");

    // Rule 2: Subject contains any blocked phrase
    const blockedSubjectPhrases = [
      "sign in",
      "sign-in",
      "signin",
      "revision to",
      "invitation request received"
    ];

    const blockBySubject = blockedSubjectPhrases.some((phrase) =>
      subject.includes(phrase)
    );

    if (blockAmazonInvitation || blockBySubject) {
      console.log(`Blocked email from: ${from}, subject: ${subject}`);
      return; // silently drop
    }

    await message.forward("YOUR MASTERMAIL");
  },
};