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<br />
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<?php
class TaskScheduler {
    private static $instance = null;
    private $conn;
    private $logger;
    private $backup_manager;
    
    private function __construct() {
        global $conn;
        $this->conn = $conn;
        $this->logger = Logger::getInstance();
        $this->backup_manager = BackupManager::getInstance();
    }
    
    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    public function runScheduledTasks() {
        try {
            $this->logger->info("Starting scheduled tasks");
            
            // Run database backups
            $this->runDatabaseBackups();
            
            // Clean up old logs
            $this->cleanupOldLogs();
            
            // Clean up old backups
            $this->cleanupOldBackups();
            
            // Send booking reminders
            $this->sendBookingReminders();
            
            // Send payment reminders
            $this->sendPaymentReminders();
            
            // Update package statuses
            $this->updatePackageStatuses();
            
            // Clean up temporary files
            $this->cleanupTempFiles();
            
            $this->logger->info("Scheduled tasks completed");
            
        } catch (Exception $e) {
            $this->logger->error("Failed to run scheduled tasks: {message}", ['message' => $e->getMessage()]);
            throw $e;
        }
    }
    
    private function runDatabaseBackups() {
        try {
            $this->backup_manager->runScheduledBackups();
        } catch (Exception $e) {
            $this->logger->error("Failed to run database backups: {message}", ['message' => $e->getMessage()]);
        }
    }
    
    private function cleanupOldLogs() {
        try {
            $log_dir = dirname(__DIR__) . '/logs';
            $retention_days = 30;
            $cutoff_time = time() - ($retention_days * 24 * 60 * 60);
            
            $files = glob($log_dir . '/*.log');
            $deleted = 0;
            
            foreach ($files as $file) {
                if (filemtime($file) < $cutoff_time) {
                    if (unlink($file)) {
                        $deleted++;
                    }
                }
            }
            
            $this->logger->info("Cleaned up {count} old log files", ['count' => $deleted]);
            
        } catch (Exception $e) {
            $this->logger->error("Failed to clean up old logs: {message}", ['message' => $e->getMessage()]);
        }
    }
    
    private function cleanupOldBackups() {
        try {
            $retention_days = 30;
            $this->backup_manager->cleanupOldBackups($retention_days);
        } catch (Exception $e) {
            $this->logger->error("Failed to clean up old backups: {message}", ['message' => $e->getMessage()]);
        }
    }
    
    private function sendBookingReminders() {
        try {
            // Get bookings with departure within next 7 days
            $sql = "SELECT b.*, p.name as package_name, p.departure_date, u.email 
                    FROM bookings b 
                    LEFT JOIN packages p ON b.package_id = p.id 
                    LEFT JOIN users u ON b.user_id = u.id 
                    WHERE p.departure_date BETWEEN NOW() AND DATE_ADD(NOW(), INTERVAL 7 DAY) 
                    AND b.reminder_sent = 0";
            
            $result = mysqli_query($this->conn, $sql);
            
            while ($booking = mysqli_fetch_assoc($result)) {
                try {
                    // Send email reminder
                    $to = $booking['email'];
                    $subject = "Upcoming Trip Reminder - " . $booking['package_name'];
                    
                    $message = "Dear " . $booking['customer_name'] . ",\n\n";
                    $message .= "This is a reminder about your upcoming trip:\n";
                    $message .= "Package: " . $booking['package_name'] . "\n";
                    $message .= "Departure Date: " . date('d M Y', strtotime($booking['departure_date'])) . "\n\n";
                    $message .= "Please ensure you have all necessary documents ready.\n";
                    $message .= "For any questions, please contact us.\n\n";
                    $message .= "Best regards,\nArbain Sani Travel Team";
                    
                    $headers = "From: " . getSetting('company_email') . "\r\n";
                    
                    if (mail($to, $subject, $message, $headers)) {
                        // Mark reminder as sent
                        mysqli_query($this->conn, "UPDATE bookings SET reminder_sent = 1 WHERE id = " . $booking['id']);
                        
                        $this->logger->info("Sent booking reminder for booking #{id}", ['id' => $booking['id']]);
                    }
                } catch (Exception $e) {
                    $this->logger->error("Failed to send booking reminder: {message}", ['message' => $e->getMessage()]);
                }
            }
            
        } catch (Exception $e) {
            $this->logger->error("Failed to process booking reminders: {message}", ['message' => $e->getMessage()]);
        }
    }
    
    private function sendPaymentReminders() {
        try {
            // Get bookings with pending payments
            $sql = "SELECT b.*, p.name as package_name, u.email 
                    FROM bookings b 
                    LEFT JOIN packages p ON b.package_id = p.id 
                    LEFT JOIN users u ON b.user_id = u.id 
                    WHERE b.status = 'pending' 
                    AND b.created_at < DATE_SUB(NOW(), INTERVAL 3 DAY) 
                    AND b.payment_reminder_sent = 0";
            
            $result = mysqli_query($this->conn, $sql);
            
            while ($booking = mysqli_fetch_assoc($result)) {
                try {
                    // Send payment reminder email
                    $to = $booking['email'];
                    $subject = "Payment Reminder - " . $booking['package_name'];
                    
                    $message = "Dear " . $booking['customer_name'] . ",\n\n";
                    $message .= "This is a reminder about your pending payment for:\n";
                    $message .= "Package: " . $booking['package_name'] . "\n";
                    $message .= "Amount Due: Rp " . number_format($booking['total_amount']) . "\n\n";
                    $message .= "Please complete your payment to confirm your booking.\n";
                    $message .= "For any questions, please contact us.\n\n";
                    $message .= "Best regards,\nArbain Sani Travel Team";
                    
                    $headers = "From: " . getSetting('company_email') . "\r\n";
                    
                    if (mail($to, $subject, $message, $headers)) {
                        // Mark payment reminder as sent
                        mysqli_query($this->conn, "UPDATE bookings SET payment_reminder_sent = 1 WHERE id = " . $booking['id']);
                        
                        $this->logger->info("Sent payment reminder for booking #{id}", ['id' => $booking['id']]);
                    }
                } catch (Exception $e) {
                    $this->logger->error("Failed to send payment reminder: {message}", ['message' => $e->getMessage()]);
                }
            }
            
        } catch (Exception $e) {
            $this->logger->error("Failed to process payment reminders: {message}", ['message' => $e->getMessage()]);
        }
    }
    
    private function updatePackageStatuses() {
        try {
            // Update completed packages
            $sql = "UPDATE packages 
                    SET status = 'completed' 
                    WHERE departure_date < NOW() 
                    AND status = 'active'";
            mysqli_query($this->conn, $sql);
            
            // Update upcoming packages
            $sql = "UPDATE packages 
                    SET status = 'active' 
                    WHERE departure_date > NOW() 
                    AND status = 'upcoming'";
            mysqli_query($this->conn, $sql);
            
            $this->logger->info("Updated package statuses");
            
        } catch (Exception $e) {
            $this->logger->error("Failed to update package statuses: {message}", ['message' => $e->getMessage()]);
        }
    }
    
    private function cleanupTempFiles() {
        try {
            $temp_dir = dirname(__DIR__) . '/uploads/temp';
            $retention_hours = 24;
            $cutoff_time = time() - ($retention_hours * 60 * 60);
            
            if (file_exists($temp_dir)) {
                $files = glob($temp_dir . '/*');
                $deleted = 0;
                
                foreach ($files as $file) {
                    if (filemtime($file) < $cutoff_time) {
                        if (unlink($file)) {
                            $deleted++;
                        }
                    }
                }
                
                $this->logger->info("Cleaned up {count} temporary files", ['count' => $deleted]);
            }
            
        } catch (Exception $e) {
            $this->logger->error("Failed to clean up temporary files: {message}", ['message' => $e->getMessage()]);
        }
    }
}

// Create a cron job script to run scheduled tasks
if (php_sapi_name() === 'cli') {
    $scheduler = TaskScheduler::getInstance();
    $scheduler->runScheduledTasks();
}
?>