function assert(condition: unknown, message = "assertion failed"): void {
  if (!condition) throw new Error(message);
}

function assertEqual<T>(actual: T, expected: T, message = "values should be equal"): void {
  if (actual !== expected) throw new Error(`${message}: expected ${String(expected)}, got ${String(actual)}`);
}

function assertDeepEqual(actual: unknown, expected: unknown, message = "values should be deeply equal"): void {
  const actualJson = JSON.stringify(actual);
  const expectedJson = JSON.stringify(expected);
  if (actualJson !== expectedJson) throw new Error(`${message}: expected ${expectedJson}, got ${actualJson}`);
}

import { mailPolicyValueAllowed, validateMailPolicy, wildcardPatternMatches } from "../src/features/mail/mailPolicyValidation";

assertEqual(wildcardPatternMatches("*.example.org", "smtp.example.org"), true);
assertEqual(wildcardPatternMatches("smtp?.example.org", "smtp1.example.org"), true);
assertEqual(wildcardPatternMatches("smtp?.example.org", "smtp12.example.org"), false);

const policy = {
  whitelist: {
    smtp_hosts: ["smtp.allowed.test"],
    from_headers: ["*@allowed.test"],
    recipient_domains: ["allowed.test"]
  },
  blacklist: {
    smtp_hosts: ["smtp.blocked.test"],
    envelope_senders: ["blocked@*"]
  }
};

assertDeepEqual(mailPolicyValueAllowed(policy, "smtp_hosts", "smtp.allowed.test"), { allowed: true, value: "smtp.allowed.test" });
assertEqual(mailPolicyValueAllowed(policy, "smtp_hosts", "smtp.blocked.test").allowed, false, "blacklist wins for SMTP host");
assertEqual(mailPolicyValueAllowed(policy, "smtp_hosts", "smtp.other.test").allowed, false, "whitelist blocks unknown SMTP host");

const messages = validateMailPolicy(policy, {
  smtpHost: "smtp.other.test",
  envelopeSender: "blocked@allowed.test",
  fromHeader: "sender@other.test",
  recipientDomains: ["allowed.test", "denied.test", "user@denied.test"]
});
assert(messages.some((item) => item.key === "smtp_hosts" && item.value === "smtp.other.test"));
assert(messages.some((item) => item.key === "envelope_senders" && item.value === "blocked@allowed.test"));
assert(messages.some((item) => item.key === "from_headers" && item.value === "sender@other.test"));
assertEqual(messages.filter((item) => item.key === "recipient_domains" && item.value === "denied.test").length, 1, "recipient domains are normalized and de-duplicated");