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<?php
class ApiManager {
    private static $instance = null;
    private $conn;
    private $logger;
    private $encryption_key;
    
    private function __construct() {
        global $conn;
        $this->conn = $conn;
        $this->logger = Logger::getInstance();
        
        // Get encryption key from environment or generate one
        $this->encryption_key = getenv('API_ENCRYPTION_KEY');
        if (!$this->encryption_key) {
            $this->encryption_key = $this->getStoredEncryptionKey();
        }
    }
    
    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    private function getStoredEncryptionKey() {
        $sql = "SELECT value FROM settings WHERE name = 'api_encryption_key'";
        $result = mysqli_query($this->conn, $sql);
        
        if ($row = mysqli_fetch_assoc($result)) {
            return $row['value'];
        }
        
        // Generate new key if not exists
        $key = bin2hex(random_bytes(32));
        $sql = "INSERT INTO settings (name, value) VALUES ('api_encryption_key', ?)";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param("s", $key);
        $stmt->execute();
        
        return $key;
    }
    
    private function encrypt($value) {
        $iv = random_bytes(16);
        $encrypted = openssl_encrypt(
            $value,
            'AES-256-CBC',
            hex2bin($this->encryption_key),
            0,
            $iv
        );
        return base64_encode($iv . $encrypted);
    }
    
    private function decrypt($encrypted_value) {
        $decoded = base64_decode($encrypted_value);
        $iv = substr($decoded, 0, 16);
        $encrypted = substr($decoded, 16);
        
        return openssl_decrypt(
            $encrypted,
            'AES-256-CBC',
            hex2bin($this->encryption_key),
            0,
            $iv
        );
    }
    
    public function saveApiKey($service, $key, $description = '') {
        try {
            // Encrypt the API key
            $encrypted_key = $this->encrypt($key);
            
            // Check if service already exists
            $sql = "SELECT id FROM api_keys WHERE service = ?";
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("s", $service);
            $stmt->execute();
            $result = $stmt->get_result();
            
            if ($result->num_rows > 0) {
                // Update existing key
                $sql = "UPDATE api_keys SET api_key = ?, description = ?, updated_at = NOW() WHERE service = ?";
                $stmt = $this->conn->prepare($sql);
                $stmt->bind_param("sss", $encrypted_key, $description, $service);
            } else {
                // Insert new key
                $sql = "INSERT INTO api_keys (service, api_key, description) VALUES (?, ?, ?)";
                $stmt = $this->conn->prepare($sql);
                $stmt->bind_param("sss", $service, $encrypted_key, $description);
            }
            
            if (!$stmt->execute()) {
                throw new Exception("Failed to save API key");
            }
            
            $this->logger->info("API key updated for service: {service}", ['service' => $service]);
            return true;
            
        } catch (Exception $e) {
            $this->logger->error("Failed to save API key: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function getApiKey($service) {
        try {
            $sql = "SELECT api_key FROM api_keys WHERE service = ?";
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("s", $service);
            $stmt->execute();
            $result = $stmt->get_result();
            
            if ($row = $result->fetch_assoc()) {
                return $this->decrypt($row['api_key']);
            }
            
            return null;
            
        } catch (Exception $e) {
            $this->logger->error("Failed to get API key: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function deleteApiKey($service) {
        try {
            $sql = "DELETE FROM api_keys WHERE service = ?";
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("s", $service);
            
            if (!$stmt->execute()) {
                throw new Exception("Failed to delete API key");
            }
            
            $this->logger->info("API key deleted for service: {service}", ['service' => $service]);
            return true;
            
        } catch (Exception $e) {
            $this->logger->error("Failed to delete API key: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function listApiKeys() {
        try {
            $sql = "SELECT service, description, created_at, updated_at FROM api_keys ORDER BY service";
            $result = mysqli_query($this->conn, $sql);
            
            $keys = [];
            while ($row = mysqli_fetch_assoc($result)) {
                $keys[] = $row;
            }
            
            return $keys;
            
        } catch (Exception $e) {
            $this->logger->error("Failed to list API keys: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function testApiKey($service) {
        try {
            $key = $this->getApiKey($service);
            if (!$key) {
                throw new Exception("API key not found");
            }
            
            // Implement service-specific API key validation
            switch ($service) {
                case 'google_maps':
                    return $this->testGoogleMapsApi($key);
                case 'mailchimp':
                    return $this->testMailchimpApi($key);
                case 'stripe':
                    return $this->testStripeApi($key);
                default:
                    throw new Exception("Unsupported service: $service");
            }
            
        } catch (Exception $e) {
            $this->logger->error("API key test failed: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    private function testGoogleMapsApi($key) {
        // Test Google Maps API key with a simple geocoding request
        $url = "https://maps.googleapis.com/maps/api/geocode/json?address=test&key=" . urlencode($key);
        $response = file_get_contents($url);
        $data = json_decode($response, true);
        
        if (isset($data['status']) && $data['status'] !== 'REQUEST_DENIED') {
            return true;
        }
        throw new Exception("Invalid Google Maps API key");
    }
    
    private function testMailchimpApi($key) {
        // Test Mailchimp API key
        $dc = explode('-', $key)[1];
        $url = "https://$dc.api.mailchimp.com/3.0/";
        
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_HTTPHEADER, ['Authorization: Bearer ' . $key]);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        
        $response = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        
        if ($http_code === 200) {
            return true;
        }
        throw new Exception("Invalid Mailchimp API key");
    }
    
    private function testStripeApi($key) {
        // Test Stripe API key
        $url = "https://api.stripe.com/v1/balance";
        
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_HTTPHEADER, ['Authorization: Bearer ' . $key]);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        
        $response = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        
        if ($http_code === 200) {
            return true;
        }
        throw new Exception("Invalid Stripe API key");
    }
}

// Example usage:
// $api_manager = ApiManager::getInstance();
// $api_manager->saveApiKey('google_maps', 'your-api-key', 'Used for maps integration');
// $key = $api_manager->getApiKey('google_maps');
?>