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<?php
require_once 'config.php';
require_once 'logger.php';

/**
 * Class to manage application settings and API keys
 */
class SettingsManager {
    private static $instance = null;
    private $conn;
    private $logger;
    private $encryptionKey;
    
    private function __construct() {
        global $conn;
        $this->conn = $conn;
        $this->logger = Logger::getInstance();
        
        // Initialize encryption key from environment or config
        $this->encryptionKey = getenv('ENCRYPTION_KEY') ?: '5d0f24b6a7c1e9h8k4m3n2p5r7t9v1x';
    }
    
    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    /**
     * Get a setting value
     * @param string $name Setting name
     * @param bool $isEncrypted Whether the setting is encrypted
     * @return mixed Setting value or null if not found
     */
    public function getSetting($name, $isEncrypted = false) {
        try {
            $stmt = mysqli_prepare($this->conn, "SELECT value FROM settings WHERE name = ?");
            mysqli_stmt_bind_param($stmt, "s", $name);
            mysqli_stmt_execute($stmt);
            $result = mysqli_stmt_get_result($stmt);
            
            if ($row = mysqli_fetch_assoc($result)) {
                $value = $row['value'];
                return $isEncrypted ? $this->decrypt($value) : $value;
            }
            
            return null;
        } catch (Exception $e) {
            $this->logger->error("Failed to get setting {name}: {message}", [
                'name' => $name,
                'message' => $e->getMessage()
            ]);
            return null;
        }
    }
    
    /**
     * Set a setting value
     * @param string $name Setting name
     * @param mixed $value Setting value
     * @param bool $isEncrypted Whether to encrypt the value
     * @return bool Success status
     */
    public function setSetting($name, $value, $isEncrypted = false) {
        try {
            if ($isEncrypted) {
                $value = $this->encrypt($value);
            }
            
            $stmt = mysqli_prepare($this->conn, 
                "INSERT INTO settings (name, value) VALUES (?, ?) 
                 ON DUPLICATE KEY UPDATE value = ?"
            );
            mysqli_stmt_bind_param($stmt, "sss", $name, $value, $value);
            $success = mysqli_stmt_execute($stmt);
            
            if ($success) {
                $this->logger->info("Updated setting {name}", ['name' => $name]);
                $this->logSettingChange($name, $isEncrypted);
            } else {
                $this->logger->error("Failed to update setting {name}", ['name' => $name]);
            }
            
            return $success;
        } catch (Exception $e) {
            $this->logger->error("Failed to set setting {name}: {message}", [
                'name' => $name,
                'message' => $e->getMessage()
            ]);
            return false;
        }
    }
    
    /**
     * Get an API key
     * @param string $service Service name
     * @return string|null API key or null if not found
     */
    public function getApiKey($service) {
        return $this->getSetting("api_key_{$service}", true);
    }
    
    /**
     * Set an API key
     * @param string $service Service name
     * @param string $key API key
     * @return bool Success status
     */
    public function setApiKey($service, $key) {
        return $this->setSetting("api_key_{$service}", $key, true);
    }
    
    /**
     * Test an API key
     * @param string $service Service name
     * @param string $key API key to test
     * @return array Test result and message
     */
    public function testApiKey($service, $key) {
        try {
            switch ($service) {
                case 'google_maps':
                    return $this->testGoogleMapsApi($key);
                case 'mailchimp':
                    return $this->testMailchimpApi($key);
                case 'stripe':
                    return $this->testStripeApi($key);
                default:
                    return [
                        'success' => false,
                        'message' => 'Unknown service'
                    ];
            }
        } catch (Exception $e) {
            $this->logger->error("API key test failed for {service}: {message}", [
                'service' => $service,
                'message' => $e->getMessage()
            ]);
            
            return [
                'success' => false,
                'message' => $e->getMessage()
            ];
        }
    }
    
    /**
     * Encrypt sensitive data
     * @param string $data Data to encrypt
     * @return string Encrypted data
     */
    private function encrypt($data) {
        $ivLength = openssl_cipher_iv_length('AES-256-CBC');
        $iv = openssl_random_pseudo_bytes($ivLength);
        $encrypted = openssl_encrypt($data, 'AES-256-CBC', $this->encryptionKey, 0, $iv);
        return base64_encode($iv . $encrypted);
    }
    
    /**
     * Decrypt sensitive data
     * @param string $data Data to decrypt
     * @return string Decrypted data
     */
    private function decrypt($data) {
        $data = base64_decode($data);
        $ivLength = openssl_cipher_iv_length('AES-256-CBC');
        $iv = substr($data, 0, $ivLength);
        $encrypted = substr($data, $ivLength);
        return openssl_decrypt($encrypted, 'AES-256-CBC', $this->encryptionKey, 0, $iv);
    }
    
    /**
     * Log setting changes for audit
     * @param string $name Setting name
     * @param bool $isEncrypted Whether the setting is encrypted
     */
    private function logSettingChange($name, $isEncrypted) {
        try {
            $stmt = mysqli_prepare($this->conn, 
                "INSERT INTO setting_audit_log (setting_name, is_encrypted, ip_address, user_agent) 
                 VALUES (?, ?, ?, ?)"
            );
            
            $ipAddress = $_SERVER['REMOTE_ADDR'] ?? 'CLI';
            $userAgent = $_SERVER['HTTP_USER_AGENT'] ?? 'CLI';
            
            mysqli_stmt_bind_param($stmt, "siss", $name, $isEncrypted, $ipAddress, $userAgent);
            mysqli_stmt_execute($stmt);
            
        } catch (Exception $e) {
            $this->logger->error("Failed to log setting change: {message}", [
                'message' => $e->getMessage()
            ]);
        }
    }
    
    /**
     * Test Google Maps API key
     * @param string $key API key to test
     * @return array Test result and message
     */
    private function testGoogleMapsApi($key) {
        $url = "https://maps.googleapis.com/maps/api/geocode/json?address=Jakarta&key={$key}";
        $response = @file_get_contents($url);
        
        if ($response === false) {
            return [
                'success' => false,
                'message' => 'Failed to connect to Google Maps API'
            ];
        }
        
        $data = json_decode($response, true);
        
        return [
            'success' => isset($data['status']) && $data['status'] === 'OK',
            'message' => isset($data['status']) ? $data['status'] : 'Unknown error'
        ];
    }
    
    /**
     * Test Mailchimp API key
     * @param string $key API key to test
     * @return array Test result and message
     */
    private function testMailchimpApi($key) {
        $dc = explode('-', $key)[1] ?? 'us1';
        $url = "https://{$dc}.api.mailchimp.com/3.0/";
        
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_USERPWD, "user:{$key}");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        
        return [
            'success' => $httpCode === 200,
            'message' => $httpCode === 200 ? 'API key is valid' : 'Invalid API key'
        ];
    }
    
    /**
     * Test Stripe API key
     * @param string $key API key to test
     * @return array Test result and message
     */
    private function testStripeApi($key) {
        $url = 'https://api.stripe.com/v1/account';
        
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            "Authorization: Bearer {$key}"
        ]);
        
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        
        return [
            'success' => $httpCode === 200,
            'message' => $httpCode === 200 ? 'API key is valid' : 'Invalid API key'
        ];
    }
}