shipping-portal/app/Classes/Modules/Transactions/Services/GeneratesTransactionBillNumber.php

<?php

namespace App\Classes\Modules\Transactions\Services;


use Carbon\Carbon;

class GeneratesTransactionBillNumber
{

    /** @var ChecksIfTransactionBillNumberExists */
    private $checksIfTransactionBillNumberExists;

    /**
     * GeneratesTransactionBillNo constructor.
     * @param ChecksIfTransactionBillNumberExists $checksIfTransactionBillNumberExists
     */
    public function __construct(ChecksIfTransactionBillNumberExists $checksIfTransactionBillNumberExists)
    {
        $this->checksIfTransactionBillNumberExists = $checksIfTransactionBillNumberExists;
    }


    /**
     * @param string $prefix
     * @return string
     */
    public function execute(string $prefix): string {
        $date = carbon::now();

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

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

    }

}