<?php

namespace App\Services;

use Carbon\Carbon;
use InvalidArgumentException;

class ChineseIdCardHelper
{
    public static function parseBirthdate(string $idCard): ?Carbon
    {
        $idCard = strtoupper(trim($idCard));
        if (strlen($idCard) !== 18) {
            return null;
        }
        if (! preg_match('/^\d{17}[\dX]$/', $idCard)) {
            return null;
        }
        $ymd = substr($idCard, 6, 8);
        try {
            return Carbon::createFromFormat('Ymd', $ymd)->startOfDay();
        } catch (InvalidArgumentException) {
            return null;
        }
    }

    public static function isBirthInRange(?Carbon $birth, $start, $end, string $tz): bool
    {
        if (! $birth) {
            return false;
        }
        if (! $start && ! $end) {
            return true;
        }
        $b = $birth->copy()->timezone($tz)->toDateString();
        if ($start) {
            $s = $start instanceof \Carbon\Carbon ? $start->toDateString() : (string) $start;
            if ($b < $s) {
                return false;
            }
        }
        if ($end) {
            $e = $end instanceof \Carbon\Carbon ? $end->toDateString() : (string) $end;
            if ($b > $e) {
                return false;
            }
        }

        return true;
    }
}