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<br />
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<?php
class SystemMonitor {
    private static $instance = null;
    private $conn;
    private $logger;
    
    private function __construct() {
        global $conn;
        $this->conn = $conn;
        $this->logger = Logger::getInstance();
    }
    
    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    public function getSystemStatus() {
        try {
            $status = [
                'server' => $this->getServerInfo(),
                'php' => $this->getPHPInfo(),
                'database' => $this->getDatabaseInfo(),
                'disk' => $this->getDiskInfo(),
                'memory' => $this->getMemoryInfo(),
                'performance' => $this->getPerformanceMetrics()
            ];
            
            // Log system status check
            $this->logger->info("System status check completed");
            
            return $status;
            
        } catch (Exception $e) {
            $this->logger->error("Failed to get system status: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    private function getServerInfo() {
        return [
            'os' => PHP_OS,
            'server_software' => $_SERVER['SERVER_SOFTWARE'],
            'server_name' => $_SERVER['SERVER_NAME'],
            'server_addr' => $_SERVER['SERVER_ADDR'],
            'server_port' => $_SERVER['SERVER_PORT'],
            'document_root' => $_SERVER['DOCUMENT_ROOT'],
            'server_protocol' => $_SERVER['SERVER_PROTOCOL'],
            'https' => isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on',
            'time' => date('Y-m-d H:i:s'),
            'timezone' => date_default_timezone_get()
        ];
    }
    
    private function getPHPInfo() {
        return [
            'version' => PHP_VERSION,
            'sapi' => PHP_SAPI,
            'extensions' => get_loaded_extensions(),
            'max_execution_time' => ini_get('max_execution_time'),
            'memory_limit' => ini_get('memory_limit'),
            'post_max_size' => ini_get('post_max_size'),
            'upload_max_filesize' => ini_get('upload_max_filesize'),
            'max_input_time' => ini_get('max_input_time'),
            'display_errors' => ini_get('display_errors'),
            'error_reporting' => ini_get('error_reporting')
        ];
    }
    
    private function getDatabaseInfo() {
        try {
            // Get MySQL version
            $version_result = mysqli_query($this->conn, 'SELECT VERSION() as version');
            $version = mysqli_fetch_assoc($version_result)['version'];
            
            // Get database size
            $size_query = "SELECT 
                table_schema AS 'database',
                ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS 'size_mb'
                FROM information_schema.tables 
                WHERE table_schema = '" . DB_NAME . "'
                GROUP BY table_schema";
            
            $size_result = mysqli_query($this->conn, $size_query);
            $size = mysqli_fetch_assoc($size_result)['size_mb'];
            
            // Get table count
            $tables_query = "SELECT COUNT(*) as count 
                            FROM information_schema.tables 
                            WHERE table_schema = '" . DB_NAME . "'";
            
            $tables_result = mysqli_query($this->conn, $tables_query);
            $table_count = mysqli_fetch_assoc($tables_result)['count'];
            
            // Get connection info
            $stats = mysqli_get_connection_stats($this->conn);
            
            return [
                'version' => $version,
                'database_name' => DB_NAME,
                'database_size_mb' => $size,
                'table_count' => $table_count,
                'connection_stats' => $stats
            ];
            
        } catch (Exception $e) {
            $this->logger->error("Failed to get database info: {message}", ['message' => $e->getMessage()]);
            return [
                'error' => $e->getMessage()
            ];
        }
    }
    
    private function getDiskInfo() {
        $root_path = dirname(dirname(__FILE__));
        
        return [
            'total_space' => disk_total_space($root_path),
            'free_space' => disk_free_space($root_path),
            'used_space' => disk_total_space($root_path) - disk_free_space($root_path),
            'usage_percent' => round((1 - (disk_free_space($root_path) / disk_total_space($root_path))) * 100, 2)
        ];
    }
    
    private function getMemoryInfo() {
        return [
            'memory_usage' => memory_get_usage(true),
            'memory_peak_usage' => memory_get_peak_usage(true),
            'memory_limit' => $this->convertToBytes(ini_get('memory_limit'))
        ];
    }
    
    private function getPerformanceMetrics() {
        try {
            // Get average response time
            $response_times = $this->getAverageResponseTime();
            
            // Get error rates
            $error_rates = $this->getErrorRates();
            
            // Get request statistics
            $request_stats = $this->getRequestStatistics();
            
            return [
                'response_time' => $response_times,
                'error_rates' => $error_rates,
                'request_stats' => $request_stats
            ];
            
        } catch (Exception $e) {
            $this->logger->error("Failed to get performance metrics: {message}", ['message' => $e->getMessage()]);
            return [
                'error' => $e->getMessage()
            ];
        }
    }
    
    private function getAverageResponseTime() {
        $sql = "SELECT 
                AVG(duration) as avg_duration,
                MIN(duration) as min_duration,
                MAX(duration) as max_duration
                FROM performance_logs 
                WHERE created_at >= DATE_SUB(NOW(), INTERVAL 1 HOUR)";
        
        $result = mysqli_query($this->conn, $sql);
        return mysqli_fetch_assoc($result);
    }
    
    private function getErrorRates() {
        $sql = "SELECT 
                COUNT(*) as total_errors
                FROM system_logs 
                WHERE level = 'error' and created_at >= DATE_SUB(NOW(), INTERVAL 24 HOUR)";
        
        $result = mysqli_query($this->conn, $sql);
        return mysqli_fetch_assoc($result);
    }
    
    private function getRequestStatistics() {
        $sql = "SELECT 
                COUNT(*) as total_requests,
                COUNT(DISTINCT ip_address) as unique_visitors,
                COUNT(DISTINCT session_id) as unique_sessions
                FROM access_logs 
                WHERE created_at >= DATE_SUB(NOW(), INTERVAL 24 HOUR)";
        
        $result = mysqli_query($this->conn, $sql);
        return mysqli_fetch_assoc($result);
    }
    
    private function convertToBytes($value) {
        $unit = strtolower(substr($value, -1));
        $number = substr($value, 0, -1);
        
        switch ($unit) {
            case 'g':
                $number *= 1024;
            case 'm':
                $number *= 1024;
            case 'k':
                $number *= 1024;
        }
        
        return $number;
    }
    
    public function checkSystemHealth() {
        try {
            $issues = [];
            $status = $this->getSystemStatus();
            
            // Check disk space
            if ($status['disk']['usage_percent'] > 90) {
                $issues[] = [
                    'type' => 'critical',
                    'component' => 'disk',
                    'message' => 'Disk usage is above 90%'
                ];
            } elseif ($status['disk']['usage_percent'] > 80) {
                $issues[] = [
                    'type' => 'warning',
                    'component' => 'disk',
                    'message' => 'Disk usage is above 80%'
                ];
            }
            
            // Check memory usage
            $memory_usage_percent = ($status['memory']['memory_usage'] / $status['memory']['memory_limit']) * 100;
            if ($memory_usage_percent > 90) {
                $issues[] = [
                    'type' => 'critical',
                    'component' => 'memory',
                    'message' => 'Memory usage is above 90%'
                ];
            } elseif ($memory_usage_percent > 80) {
                $issues[] = [
                    'type' => 'warning',
                    'component' => 'memory',
                    'message' => 'Memory usage is above 80%'
                ];
            }
            
            // Check database connection
            if (isset($status['database']['error'])) {
                $issues[] = [
                    'type' => 'critical',
                    'component' => 'database',
                    'message' => 'Database connection error: ' . $status['database']['error']
                ];
            }
            
            // Check error rates
            if ($status['performance']['error_rates']['total_errors'] > 100) {
                $issues[] = [
                    'type' => 'critical',
                    'component' => 'errors',
                    'message' => 'High error rate detected'
                ];
            }
            
            // Log health check results
            if (!empty($issues)) {
                foreach ($issues as $issue) {
                    if ($issue['type'] === 'critical') {
                        $this->logger->critical("System health issue: {message}", ['message' => $issue['message']]);
                    } else {
                        $this->logger->warning("System health issue: {message}", ['message' => $issue['message']]);
                    }
                }
            } else {
                $this->logger->info("System health check passed");
            }
            
            return [
                'healthy' => empty($issues),
                'issues' => $issues
            ];
            
        } catch (Exception $e) {
            $this->logger->error("Failed to check system health: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
}

// Example usage:
// $monitor = SystemMonitor::getInstance();
// $status = $monitor->getSystemStatus();
// $health = $monitor->checkSystemHealth();
?>