import { describe, expect, it } from 'vitest';
import { isE164, phoneLast4, toE164 } from '../src/phone';

/**
 * These are security tests, not formatting tests. `users.phone` is UNIQUE and
 * bans are per-account, so any pair of inputs that normalises to two different
 * strings for one real handset is a way to hold two accounts and to escape a ban.
 */
describe('toE164', () => {
  it('passes through an already-normalised number', () => {
    expect(toE164('+34600111222')).toBe('+34600111222');
  });

  it('collapses every separator style a human types to ONE stored form', () => {
    const forms = [
      '+34 600 111 222',
      '+34-600-111-222',
      '+34 (600) 111.222',
      '  +34600111222  ',
      '0034600111222',
      '0034 600 111 222',
    ];
    const normalised = new Set(forms.map(toE164));
    expect(normalised).toEqual(new Set(['+34600111222']));
  });

  it('refuses a bare national number rather than guessing a country', () => {
    // Guessing would attach one person's account to another person's number.
    expect(toE164('600111222')).toBeNull();
    expect(toE164('0600111222')).toBeNull();
  });

  it('rejects junk, empties and letters', () => {
    expect(toE164(null)).toBeNull();
    expect(toE164(undefined)).toBeNull();
    expect(toE164('')).toBeNull();
    expect(toE164('   ')).toBeNull();
    expect(toE164('+34600ABC222')).toBeNull();
    expect(toE164('not a phone')).toBeNull();
  });

  it('enforces E.164 length and a nonzero country digit', () => {
    expect(toE164('+3460011')).toBeNull(); // too short
    expect(toE164('+3460011122233344')).toBeNull(); // too long
    expect(toE164('+0600111222')).toBeNull(); // country code cannot start with 0
  });
});

describe('isE164', () => {
  it('accepts only the canonical stored form', () => {
    expect(isE164('+34600111222')).toBe(true);
    expect(isE164('0034600111222')).toBe(false);
    expect(isE164('+34 600 111 222')).toBe(false);
  });
});

describe('phoneLast4', () => {
  it('returns the last four digits for masked display', () => {
    expect(phoneLast4('+34600111222')).toBe('1222');
  });
});