import { describe, expect, it } from 'vitest';
import {
  isContactableEmail,
  isSyntheticEmail,
  phoneFromSyntheticEmail,
  syntheticEmailFor,
} from '../src/email';

describe('synthetic emails', () => {
  it('mints an address from a phone number', () => {
    expect(syntheticEmailFor('+34600123456')).toBe('+34600123456@phone.linkder.local');
  });

  it('recognises its own output', () => {
    expect(isSyntheticEmail(syntheticEmailFor('+34600123456'))).toBe(true);
  });

  it('treats a real address as contactable', () => {
    expect(isSyntheticEmail('marc@gmail.com')).toBe(false);
    expect(isContactableEmail('marc@gmail.com')).toBe(true);
  });

  it('treats null and empty as not contactable rather than throwing', () => {
    expect(isSyntheticEmail(null)).toBe(true);
    expect(isSyntheticEmail(undefined)).toBe(true);
    expect(isSyntheticEmail('')).toBe(true);
    expect(isContactableEmail(null)).toBe(false);
  });

  it('is case insensitive — a bounce is a bounce whatever the casing', () => {
    expect(isSyntheticEmail('+34600123456@PHONE.LINKDER.LOCAL')).toBe(true);
  });

  it('does not match a lookalike domain', () => {
    expect(isSyntheticEmail('someone@phone.linkder.local.evil.com')).toBe(false);
    expect(isSyntheticEmail('someone@notphone.linkder.local')).toBe(false);
  });

  it('recovers the phone number for support tooling', () => {
    expect(phoneFromSyntheticEmail('+34600123456@phone.linkder.local')).toBe('+34600123456');
    expect(phoneFromSyntheticEmail('marc@gmail.com')).toBeNull();
  });
});