<?php
namespace App\Support;

class PhoneNumber
{
    public static function normalizeDigits(string $value): string
    {
        return preg_replace('/\D+/', '', $value) ?? '';
    }

    public static function normalizeForMatch(string $value): string
    {
        $clean = preg_replace('/[^0-9+]/', '', trim($value)) ?? '';
        if ($clean === '') {
            return '';
        }

        if (str_starts_with($clean, '00')) {
            return '+' . substr($clean, 2);
        }

        return $clean;
    }

    public static function toE164Italy(?string $value, string $defaultPrefix = '+39'): ?string
    {
        $raw = trim((string) $value);
        if ($raw === '') {
            return null;
        }

        $normalized = self::normalizeForMatch($raw);
        if ($normalized === '') {
            return null;
        }

        if (str_starts_with($normalized, '+')) {
            return $normalized;
        }

        if (str_starts_with($normalized, '39') && strlen($normalized) >= 10) {
            return '+' . $normalized;
        }

        $prefixDigits = self::normalizeDigits($defaultPrefix);
        if ($prefixDigits === '') {
            $prefixDigits = '39';
        }

        return '+' . $prefixDigits . ltrim($normalized, '0');
    }

    public static function splitItaly(?string $value): array
    {
        $e164 = self::toE164Italy($value);
        if ($e164 === null) {
            return [null, null, null];
        }

        if (str_starts_with($e164, '+39')) {
            return [$e164, '+39', substr($e164, 3) ?: null];
        }

        return [$e164, null, ltrim($e164, '+') ?: null];
    }
}