<?php

namespace App\Utilities;

final class FinanceLedgerAccountType
{
    public const ALIPAY = '支付宝';

    public const BANK_ACCOUNT_TYPES = ['公户', '个人卡', '网商银行'];

    public const DEFAULT_OPTIONS = [
        '个人卡',
        '公户',
        self::ALIPAY,
        '网商银行',
    ];

    public static function options(array ...$groups): array
    {
        $types = self::DEFAULT_OPTIONS;
        foreach ($groups as $group) {
            foreach ($group as $type) {
                $type = trim((string) $type);
                if ($type !== '') {
                    $types[] = $type;
                }
            }
        }

        $types = array_values(array_unique($types));
        sort($types, SORT_NATURAL | SORT_FLAG_CASE);

        return $types;
    }

    public static function last4(?string $accountType, ?string $accountNo, ?string $fallback = null): string
    {
        $type = trim((string) $accountType);
        if ($type === self::ALIPAY) {
            return '/';
        }

        if (in_array($type, self::BANK_ACCOUNT_TYPES, true)) {
            $digits = preg_replace('/\D+/', '', (string) $accountNo);
            if (strlen((string) $digits) >= 4) {
                return substr((string) $digits, -4);
            }
        }

        $fallback = trim((string) $fallback);

        return $fallback !== '' ? $fallback : '/';
    }
}