<?php
namespace App\Services;

class PaymentService {
    
    public function generateUUID() {
        return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
            mt_rand(0, 0xffff), mt_rand(0, 0xffff),
            mt_rand(0, 0xffff),
            mt_rand(0, 0x0fff) | 0x4000,
            mt_rand(0, 0x3fff) | 0x8000,
            mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
        );
    }

    public function generateVerificationToken($transactionId, $amount) {
        return hash('sha256', $transactionId . $amount . 'SECRET_SALT_2026');
    }

    public function processPayment($method, $amount) {
        // Offline Simulation
        // In a real scenario, this would call a gateway API
        return [
            'success' => true,
            'transaction_id' => $this->generateUUID(),
            'status' => 'paid'
        ];
    }
}