exchange-2.0/app/Classes/Modules/Bookings/Services/CalculatesBookingCurrencyAverageRate.php

<?php

namespace App\Classes\Modules\Bookings\Services;

use App\Classes\ValueObjects\Constants\ApprovalStatus;
use App\Classes\ValueObjects\Constants\TransactionType;
use App\Models\Booking;
use Carbon\Carbon;

class CalculatesBookingCurrencyAverageRate
{
    public function execute(Booking $booking, $type){

    	if ($type == TransactionType::PAYMENT) {
            return $booking->transactions()
                ->where('type', TransactionType::PAYMENT)
                ->whereIn('status', [ApprovalStatus::APPROVED, ApprovalStatus::COMPLETED])
                ->avg('currency_rate');
        }
        else if ($type == TransactionType::BILL) {
        	return $booking->transactions()
                ->where('type', TransactionType::BILL)
                ->whereIn('status', [ApprovalStatus::APPROVED, ApprovalStatus::COMPLETED])
                ->avg('currency_rate');
        }
    }

}