owl-admin/app/Services/Client/Traits/CalculatesOrderAmounts.php

<?php

namespace App\Services\Client\Traits;

use App\Models\MemberUser;

trait CalculatesOrderAmounts
{
    private function calculateTotalAmount(float $projectPrice, float $deliveryFee, float $discountAmount): float
    {
        $totalAmount = bcadd($projectPrice, $deliveryFee, 2);
        $totalAmount = bcsub($totalAmount, $discountAmount, 2);

        return max(0, $totalAmount);
    }

    private function calculatePaymentDistribution(MemberUser $user, float $totalAmount, bool $useBalance): array
    {
        if (! $useBalance || $totalAmount <= 0) {
            return [
                'balance_amount' => 0,
                'pay_amount' => $totalAmount,
            ];
        }

        $availableBalance = $user->wallet?->available_balance ?? 0;

        if ($availableBalance >= $totalAmount) {
            return [
                'balance_amount' => $totalAmount,
                'pay_amount' => 0,
            ];
        }

        return [
            'balance_amount' => $availableBalance,
            'pay_amount' => bcsub($totalAmount, $availableBalance, 2),
        ];
    }
}