exchange-2.0/app/Classes/Modules/Transactions/Services/GeneratesGroupTransactionBillNumber.php

<?php

namespace App\Classes\Modules\Transactions\Services;


use Carbon\Carbon;

class GeneratesGroupTransactionBillNumber
{

    /** @var ChecksIfGroupTransactionBillNumberExists */
    private $checksIfGroupTransactionBillNumberExists;

    /**
     * GeneratesGroupTransactionBillNumber constructor.
     * @param ChecksIfGroupTransactionBillNumberExists $checksIfGroupTransactionBillNumberExists
     */
    public function __construct(ChecksIfGroupTransactionBillNumberExists $checksIfGroupTransactionBillNumberExists)
    {
        $this->checksIfGroupTransactionBillNumberExists = $checksIfGroupTransactionBillNumberExists;
    }

    /**
     * @param string $prefix
     * @param Carbon|null $date
     * @return string
     */
    public function execute(string $prefix, ?Carbon $date = null): string {
        if(!$date){
            $date = carbon::now();
        }

        $billNumber = $prefix.$date->format('Y').$date->format('m').'-'.mt_rand(10000, 99999);

        return !$this->checksIfGroupTransactionBillNumberExists->execute($billNumber) ? $billNumber : self::execute($prefix);

    }

}