<?php

namespace App\Support;

/**
 * ITU-T E.164 calling codes <-> ISO 3166-1 alpha-2.
 *
 * Used to infer cc / country / in from a bare WhatsApp phone number
 * (wap.js reports userId as an int with no country-code breakdown).
 * Longest-prefix-first so 1-3 digit codes resolve correctly.
 */
final class CountryCallingCode
{
    /** @var array<string, string> calling-code => ISO alpha-2 */
    private const CALLING_CODES = [
        '1' => 'US', '7' => 'RU',
        '20' => 'EG', '27' => 'ZA', '30' => 'GR', '31' => 'NL', '32' => 'BE',
        '33' => 'FR', '34' => 'ES', '36' => 'HU', '39' => 'IT', '40' => 'RO',
        '41' => 'CH', '43' => 'AT', '44' => 'GB', '45' => 'DK', '46' => 'SE',
        '47' => 'NO', '48' => 'PL', '49' => 'DE', '51' => 'PE', '52' => 'MX',
        '53' => 'CU', '54' => 'AR', '55' => 'BR', '56' => 'CL', '57' => 'CO',
        '58' => 'VE', '60' => 'MY', '61' => 'AU', '62' => 'ID', '63' => 'PH',
        '64' => 'NZ', '65' => 'SG', '66' => 'TH', '81' => 'JP', '82' => 'KR',
        '84' => 'VN', '86' => 'CN', '90' => 'TR', '91' => 'IN', '92' => 'PK',
        '93' => 'AF', '94' => 'LK', '95' => 'MM', '98' => 'IR',
        '211' => 'SS', '212' => 'MA', '213' => 'DZ', '216' => 'TN', '218' => 'LY',
        '220' => 'GM', '221' => 'SN', '222' => 'MR', '223' => 'ML', '224' => 'GN',
        '225' => 'CI', '226' => 'BF', '227' => 'NE', '228' => 'TG', '229' => 'BJ',
        '230' => 'MU', '231' => 'LR', '232' => 'SL', '233' => 'GH', '234' => 'NG',
        '235' => 'TD', '236' => 'CF', '237' => 'CM', '238' => 'CV', '239' => 'ST',
        '240' => 'GQ', '241' => 'GA', '242' => 'CG', '243' => 'CD', '244' => 'AO',
        '245' => 'GW', '248' => 'SC', '249' => 'SD', '250' => 'RW', '251' => 'ET',
        '252' => 'SO', '253' => 'DJ', '254' => 'KE', '255' => 'TZ', '256' => 'UG',
        '257' => 'BI', '258' => 'MZ', '260' => 'ZM', '261' => 'MG', '263' => 'ZW',
        '264' => 'NA', '265' => 'MW', '266' => 'LS', '267' => 'BW', '268' => 'SZ',
        '269' => 'KM', '290' => 'SH', '291' => 'ER', '297' => 'AW', '298' => 'FO',
        '299' => 'GL', '350' => 'GI', '351' => 'PT', '352' => 'LU', '353' => 'IE',
        '354' => 'IS', '355' => 'AL', '356' => 'MT', '357' => 'CY', '358' => 'FI',
        '359' => 'BG', '370' => 'LT', '371' => 'LV', '372' => 'EE', '373' => 'MD',
        '374' => 'AM', '375' => 'BY', '376' => 'AD', '377' => 'MC', '378' => 'SM',
        '380' => 'UA', '381' => 'RS', '382' => 'ME', '383' => 'XK', '385' => 'HR',
        '386' => 'SI', '387' => 'BA', '389' => 'MK', '420' => 'CZ', '421' => 'SK',
        '423' => 'LI', '500' => 'FK', '501' => 'BZ', '502' => 'GT', '503' => 'SV',
        '504' => 'HN', '505' => 'NI', '506' => 'CR', '507' => 'PA', '508' => 'PM',
        '509' => 'HT', '590' => 'GP', '591' => 'BO', '592' => 'GY', '593' => 'EC',
        '594' => 'GF', '595' => 'PY', '596' => 'MQ', '597' => 'SR', '598' => 'UY',
        '599' => 'CW', '670' => 'TL', '672' => 'NF', '673' => 'BN', '674' => 'NR',
        '675' => 'PG', '676' => 'TO', '677' => 'SB', '678' => 'VU', '679' => 'FJ',
        '680' => 'PW', '681' => 'WF', '682' => 'CK', '685' => 'WS', '686' => 'KI',
        '687' => 'NC', '688' => 'TV', '689' => 'PF', '690' => 'TK', '691' => 'FM',
        '692' => 'MH', '850' => 'KP', '852' => 'HK', '853' => 'MO', '855' => 'KH',
        '856' => 'LA', '880' => 'BD', '886' => 'TW', '960' => 'MV', '961' => 'LB',
        '962' => 'JO', '963' => 'SY', '964' => 'IQ', '965' => 'KW', '966' => 'SA',
        '967' => 'YE', '968' => 'OM', '971' => 'AE', '972' => 'IL', '973' => 'BH',
        '974' => 'QA', '975' => 'BT', '976' => 'MN', '977' => 'NP', '992' => 'TJ',
        '993' => 'TM', '994' => 'AZ', '995' => 'GE', '996' => 'KG', '998' => 'UZ',
    ];

    /**
     * Infer [cc, country] from a bare E.164 phone (no + prefix).
     * Longest-prefix-first; returns ['', ''] on no match.
     *
     * @return array{0:string, 1:string}  [cc, iso]
     */
    public static function inferFromPhone(string $phone): array
    {
        $phone = preg_replace('/\D+/', '', $phone) ?? '';
        if ($phone === '') {
            return ['', ''];
        }
        for ($len = 3; $len >= 1; $len--) {
            $prefix = substr($phone, 0, $len);
            if (isset(self::CALLING_CODES[$prefix])) {
                return [$prefix, self::CALLING_CODES[$prefix]];
            }
        }

        return ['', ''];
    }

    public static function callingCodeForCountry(?string $iso): ?string
    {
        $iso = strtoupper(trim((string) $iso));
        if ($iso === '' || $iso === 'T1' || $iso === 'XX') {
            return null;
        }
        foreach (self::CALLING_CODES as $code => $country) {
            if ($country === $iso) {
                return $code;
            }
        }

        return null;
    }
}