<?php

namespace App\Support;

/**
 * Normalizes Iranian mobile numbers to the canonical "09XXXXXXXXX" form so that the
 * frontend can send numbers with Persian/Arabic digits, spaces, dashes or a country
 * code (+98 / 0098 / 98) without tripping the validation regex.
 */
class Mobile
{
    public const REGEX = '/^09\d{9}$/';

    public static function normalize(?string $value): ?string
    {
        if ($value === null) {
            return null;
        }

        $digits = strtr(trim($value), [
            '۰' => '0', '۱' => '1', '۲' => '2', '۳' => '3', '۴' => '4',
            '۵' => '5', '۶' => '6', '۷' => '7', '۸' => '8', '۹' => '9',
            '٠' => '0', '١' => '1', '٢' => '2', '٣' => '3', '٤' => '4',
            '٥' => '5', '٦' => '6', '٧' => '7', '٨' => '8', '٩' => '9',
        ]);

        $digits = preg_replace('/[^\d+]/', '', $digits) ?? '';

        if (str_starts_with($digits, '+98')) {
            $digits = '0'.substr($digits, 3);
        } elseif (str_starts_with($digits, '0098')) {
            $digits = '0'.substr($digits, 4);
        } elseif (str_starts_with($digits, '98') && strlen($digits) === 12) {
            $digits = '0'.substr($digits, 2);
        } elseif (strlen($digits) === 10 && str_starts_with($digits, '9')) {
            $digits = '0'.$digits;
        }

        return $digits === '' ? null : $digits;
    }
}