import { faToEn } from './digits';

/**
 * Digit normalisation, ported from the reference's Utility::faTOen(), which
 * every mobile number and every submitted OTP code passes through before it is
 * compared (henza_server ApiMobileController.php:42,56).
 *
 * Without it a user typing ۱۲۳۴ on a Persian keypad could never match a stored
 * 1234, and the phone lookup would miss a registered customer entirely.
 */
describe('faToEn', () => {
  it('converts Persian (Extended Arabic-Indic) digits', () => {
    expect(faToEn('۰۹۱۲۸۰۸۱۳۹۲')).toBe('09128081392');
  });

  it('converts Arabic-Indic digits', () => {
    expect(faToEn('٠٩١٢٨٠٨١٣٩٢')).toBe('09128081392');
  });

  it('leaves ASCII digits untouched', () => {
    expect(faToEn('09128081392')).toBe('09128081392');
  });

  it('handles a mixed-script number', () => {
    expect(faToEn('۰۹12۸0۸1۳۹۲')).toBe('09128081392');
  });

  it('trims surrounding whitespace, as a pasted number often carries', () => {
    expect(faToEn('  ۰۹۱۲۳۴۵۶۷۸۹  ')).toBe('09123456789');
  });

  it('normalises a 4-digit OTP code the same way', () => {
    expect(faToEn('۷۳۵۷')).toBe('7357');
  });

  it('is a no-op on an empty string', () => {
    expect(faToEn('')).toBe('');
  });
});