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<?php
class BackupManager {
    private static $instance = null;
    private $backup_dir;
    private $logger;
    private $conn;
    
    private function __construct() {
        global $conn;
        $this->conn = $conn;
        $this->backup_dir = dirname(__DIR__) . '/backups';
        $this->logger = Logger::getInstance();
        
        if (!file_exists($this->backup_dir)) {
            mkdir($this->backup_dir, 0777, true);
        }
    }
    
    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    public function createBackup($include_data = true) {
        try {
            $timestamp = date('Y-m-d_H-i-s');
            $filename = "backup_{$timestamp}.sql";
            $filepath = $this->backup_dir . '/' . $filename;
            
            // Get database credentials from config
            $host = DB_HOST;
            $user = DB_USER;
            $pass = DB_PASS;
            $name = DB_NAME;
            
            // Build mysqldump command
            $command = sprintf(
                'mysqldump --host=%s --user=%s --password=%s',
                escapeshellarg($host),
                escapeshellarg($user),
                escapeshellarg($pass)
            );
            
            if (!$include_data) {
                $command .= ' --no-data';
            }
            
            $command .= ' ' . escapeshellarg($name) . ' > ' . escapeshellarg($filepath);
            
            // Execute backup
            exec($command, $output, $return_var);
            
            if ($return_var !== 0) {
                throw new Exception("Failed to create backup");
            }
            
            // Record backup in database
            $sql = "INSERT INTO backups (filename, created_by, include_data) VALUES (?, ?, ?)";
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("sii", $filename, $_SESSION['user_id'], $include_data);
            
            if (!$stmt->execute()) {
                unlink($filepath);
                throw new Exception("Failed to record backup in database");
            }
            
            $this->logger->info("Database backup created: {filename}", ['filename' => $filename]);
            return $filename;
            
        } catch (Exception $e) {
            $this->logger->error("Backup creation failed: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function restoreBackup($backup_id) {
        try {
            // Get backup file
            $sql = "SELECT filename FROM backups WHERE id = ?";
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("i", $backup_id);
            $stmt->execute();
            $result = $stmt->get_result();
            
            if ($backup = $result->fetch_assoc()) {
                $filepath = $this->backup_dir . '/' . $backup['filename'];
                
                if (!file_exists($filepath)) {
                    throw new Exception("Backup file not found");
                }
                
                // Get database credentials
                $host = DB_HOST;
                $user = DB_USER;
                $pass = DB_PASS;
                $name = DB_NAME;
                
                // Create a new backup before restoring
                $this->createBackup();
                
                // Build mysql restore command
                $command = sprintf(
                    'mysql --host=%s --user=%s --password=%s %s < %s',
                    escapeshellarg($host),
                    escapeshellarg($user),
                    escapeshellarg($pass),
                    escapeshellarg($name),
                    escapeshellarg($filepath)
                );
                
                // Execute restore
                exec($command, $output, $return_var);
                
                if ($return_var !== 0) {
                    throw new Exception("Failed to restore backup");
                }
                
                $this->logger->info("Database restored from backup: {filename}", [
                    'filename' => $backup['filename']
                ]);
                return true;
            }
            
            throw new Exception("Backup not found");
            
        } catch (Exception $e) {
            $this->logger->error("Backup restoration failed: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function deleteBackup($backup_id) {
        try {
            // Get backup file
            $sql = "SELECT filename FROM backups WHERE id = ?";
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("i", $backup_id);
            $stmt->execute();
            $result = $stmt->get_result();
            
            if ($backup = $result->fetch_assoc()) {
                $filepath = $this->backup_dir . '/' . $backup['filename'];
                
                // Delete file if exists
                if (file_exists($filepath)) {
                    unlink($filepath);
                }
                
                // Delete record from database
                $sql = "DELETE FROM backups WHERE id = ?";
                $stmt = $this->conn->prepare($sql);
                $stmt->bind_param("i", $backup_id);
                
                if (!$stmt->execute()) {
                    throw new Exception("Failed to delete backup record");
                }
                
                $this->logger->info("Backup deleted: {filename}", ['filename' => $backup['filename']]);
                return true;
            }
            
            throw new Exception("Backup not found");
            
        } catch (Exception $e) {
            $this->logger->error("Backup deletion failed: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function getBackups($page = 1, $limit = 10) {
        try {
            $offset = ($page - 1) * $limit;
            
            // Get total count
            $count_result = $this->conn->query("SELECT COUNT(*) as total FROM backups");
            $total = $count_result->fetch_assoc()['total'];
            
            // Get backups with pagination
            $sql = "SELECT b.*, u.username as created_by_name 
                    FROM backups b 
                    LEFT JOIN users u ON b.created_by = u.id 
                    ORDER BY b.created_at DESC 
                    LIMIT ?, ?";
            
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("ii", $offset, $limit);
            $stmt->execute();
            $result = $stmt->get_result();
            
            $backups = [];
            while ($row = $result->fetch_assoc()) {
                $filepath = $this->backup_dir . '/' . $row['filename'];
                $row['size'] = file_exists($filepath) ? filesize($filepath) : 0;
                $backups[] = $row;
            }
            
            return [
                'backups' => $backups,
                'total' => $total,
                'pages' => ceil($total / $limit)
            ];
            
        } catch (Exception $e) {
            $this->logger->error("Failed to get backups: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function cleanupOldBackups($days = 30) {
        try {
            $cutoff_date = date('Y-m-d H:i:s', strtotime("-$days days"));
            
            // Get old backups
            $sql = "SELECT id, filename FROM backups WHERE created_at < ?";
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("s", $cutoff_date);
            $stmt->execute();
            $result = $stmt->get_result();
            
            $deleted = 0;
            while ($backup = $result->fetch_assoc()) {
                try {
                    $this->deleteBackup($backup['id']);
                    $deleted++;
                } catch (Exception $e) {
                    $this->logger->warning("Failed to delete old backup {filename}: {message}", [
                        'filename' => $backup['filename'],
                        'message' => $e->getMessage()
                    ]);
                }
            }
            
            $this->logger->info("Cleaned up {count} old backups", ['count' => $deleted]);
            return $deleted;
            
        } catch (Exception $e) {
            $this->logger->error("Backup cleanup failed: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function scheduleBackup($frequency = 'daily', $include_data = true) {
        try {
            $sql = "INSERT INTO scheduled_backups (frequency, include_data, next_run) 
                    VALUES (?, ?, ?)";
            
            $next_run = $this->calculateNextRun($frequency);
            
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("sis", $frequency, $include_data, $next_run);
            
            if (!$stmt->execute()) {
                throw new Exception("Failed to schedule backup");
            }
            
            $this->logger->info("Scheduled {frequency} backup", ['frequency' => $frequency]);
            return true;
            
        } catch (Exception $e) {
            $this->logger->error("Failed to schedule backup: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    public function runScheduledBackups() {
        try {
            $now = date('Y-m-d H:i:s');
            
            // Get due backups
            $sql = "SELECT * FROM scheduled_backups WHERE next_run <= ? AND active = 1";
            $stmt = $this->conn->prepare($sql);
            $stmt->bind_param("s", $now);
            $stmt->execute();
            $result = $stmt->get_result();
            
            while ($schedule = $result->fetch_assoc()) {
                try {
                    // Create backup
                    $this->createBackup($schedule['include_data']);
                    
                    // Update next run time
                    $next_run = $this->calculateNextRun($schedule['frequency']);
                    $update_sql = "UPDATE scheduled_backups SET next_run = ? WHERE id = ?";
                    $update_stmt = $this->conn->prepare($update_sql);
                    $update_stmt->bind_param("si", $next_run, $schedule['id']);
                    $update_stmt->execute();
                    
                } catch (Exception $e) {
                    $this->logger->error("Scheduled backup failed: {message}", ['message' => $e->getMessage()]);
                }
            }
            
        } catch (Exception $e) {
            $this->logger->error("Failed to run scheduled backups: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    private function calculateNextRun($frequency) {
        $now = time();
        
        switch ($frequency) {
            case 'hourly':
                return date('Y-m-d H:00:00', strtotime('+1 hour', $now));
            case 'daily':
                return date('Y-m-d 00:00:00', strtotime('+1 day', $now));
            case 'weekly':
                return date('Y-m-d 00:00:00', strtotime('next monday', $now));
            case 'monthly':
                return date('Y-m-01 00:00:00', strtotime('+1 month', $now));
            default:
                throw new Exception("Invalid backup frequency: $frequency");
        }
    }
}

// Example usage:
// $backup_manager = BackupManager::getInstance();
// $backup_manager->createBackup();
// $backup_manager->restoreBackup($backup_id);
// $backup_manager->scheduleBackup('daily');
?>