<?php
class ThawaniService {
    private $pdo;
    private $publicKey;
    private $secretKey;
    private $isSandbox;

    public function __construct($pdo) {
        $this->pdo = $pdo;
        $this->loadConfig();
    }

    private function loadConfig() {
        $stmt = $this->pdo->prepare("SELECT setting_key, setting_value FROM integration_settings WHERE provider = 'thawani'");
        $stmt->execute();
        $settings = $stmt->fetchAll(PDO::FETCH_KEY_PAIR);
        
        $this->publicKey = $settings['public_key'] ?? '';
        $this->secretKey = $settings['secret_key'] ?? '';
        $this->isSandbox = ($settings['environment'] ?? 'sandbox') === 'sandbox';
    }

    public function createCheckoutSession($orderId, $amount, $customerData) {
        // Implementation for creating a checkout session
        // This is a placeholder for actual API integration
        return [
            'success' => true,
            'session_id' => 'sess_' . uniqid(),
            'redirect_url' => 'https://uat.thawani.om/pay/...' // Example URL
        ];
    }

    public function handleWebhook($payload) {
        // Implementation for webhook handling
        return true;
    }
}