/* phone.js — Normalisasi & validasi nomor WhatsApp Indonesia */
(function (global) {
  'use strict';

  function normalize(raw) {
    if (!raw) return '';
    var s = String(raw).replace(/[^\d+]/g, '');
    if (s.charAt(0) === '+') s = s.slice(1);
    if (s.indexOf('620') === 0) s = '62' + s.slice(3);
    if (s.charAt(0) === '0') s = '62' + s.slice(1);
    else if (s.charAt(0) === '8') s = '62' + s;
    return s;
  }

  function isValid(norm) {
    return /^62\d{8,13}$/.test(norm || '');
  }

  function formatDisplay(norm) {
    if (!norm) return '';
    if (norm.indexOf('62') !== 0) return '+' + norm;
    var rest = norm.slice(2);
    var groups = rest.match(/.{1,4}/g) || [rest];
    return '+62 ' + groups.join('-');
  }

  global.Phone = { normalize: normalize, isValid: isValid, formatDisplay: formatDisplay };
})(window);