<?php
/*******************************************************************************************************************
| Enhanced Notification Job
| Handles various types of notifications (email, push, in-app)
|*******************************************************************************************************************/

class NotificationJob extends BaseJob
{
    /**
     * Handle notification sending
     * @param array $data Notification data
     * @return array Sending result
     */
    public function handle($data)
    {
        $this->validateData($data, ['type', 'recipient']);
        
        $type = $data['type'];
        $recipient = $data['recipient'];
        $subject = $data['subject'] ?? '';
        $message = $data['message'] ?? '';
        $templateData = $data['template_data'] ?? [];
        $priority = $data['priority'] ?? 'normal';
        
        $this->logProgress('Processing notification', [
            'type' => $type,
            'recipient' => $recipient,
            'subject' => $subject,
            'priority' => $priority
        ]);
        
        try {
            $result = [];
            
            switch ($type) {
                case 'email':
                    $result = $this->sendEmailNotification($recipient, $subject, $message, $templateData);
                    break;
                    
                case 'push':
                    $result = $this->sendPushNotification($recipient, $subject, $message, $templateData);
                    break;
                    
                case 'in_app':
                    $result = $this->sendInAppNotification($recipient, $subject, $message, $templateData);
                    break;
                    
                case 'sms':
                    $result = $this->sendSMSNotification($recipient, $message, $templateData);
                    break;
                    
                case 'webhook':
                    $result = $this->sendWebhookNotification($recipient, $data);
                    break;
                    
                default:
                    throw new Exception("Unknown notification type: {$type}");
            }
            
            // Log notification result
            $this->logProgress('Notification sent', [
                'type' => $type,
                'recipient' => $recipient,
                'success' => $result['success'],
                'message_id' => $result['message_id'] ?? null
            ]);
            
            // Update notification status in database
            if (isset($data['notification_id'])) {
                $this->updateNotificationStatus($data['notification_id'], $result['success'] ? 'sent' : 'failed', $result);
            }
            
            return $result;
            
        } catch (Exception $e) {
            $this->logError('Notification failed', [
                'type' => $type,
                'recipient' => $recipient,
                'error' => $e->getMessage()
            ]);
            
            // Update notification status as failed
            if (isset($data['notification_id'])) {
                $this->updateNotificationStatus($data['notification_id'], 'failed', ['error' => $e->getMessage()]);
            }
            
            throw $e;
        }
    }
    
    /**
     * Send email notification
     * @param string $recipient Email address
     * @param string $subject Email subject
     * @param string $message Email message
     * @param array $templateData Template data
     * @return array Sending result
     */
    private function sendEmailNotification($recipient, $subject, $message, $templateData)
    {
        try {
            // Use existing email system or implement new one
            $emailSender = new VEmailSender();
            
            // Process template if provided
            if (isset($templateData['template'])) {
                $message = $this->processEmailTemplate($templateData['template'], $templateData);
            }
            
            $result = $emailSender->sendEmail($recipient, $subject, $message, [
                'html' => $templateData['html'] ?? true,
                'attachments' => $templateData['attachments'] ?? []
            ]);
            
            return [
                'success' => $result,
                'message_id' => $emailSender->getLastMessageId(),
                'type' => 'email'
            ];
            
        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage(),
                'type' => 'email'
            ];
        }
    }
    
    /**
     * Send push notification
     * @param string $recipient User ID or device token
     * @param string $title Notification title
     * @param string $message Notification message
     * @param array $templateData Additional data
     * @return array Sending result
     */
    private function sendPushNotification($recipient, $title, $message, $templateData)
    {
        try {
            // Implement push notification logic
            $pushService = new VPushNotificationService();
            
            $payload = [
                'title' => $title,
                'body' => $message,
                'data' => $templateData['data'] ?? [],
                'badge' => $templateData['badge'] ?? null,
                'sound' => $templateData['sound'] ?? 'default'
            ];
            
            $result = $pushService->sendNotification($recipient, $payload);
            
            return [
                'success' => $result['success'],
                'message_id' => $result['message_id'] ?? null,
                'type' => 'push'
            ];
            
        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage(),
                'type' => 'push'
            ];
        }
    }
    
    /**
     * Send in-app notification
     * @param string $recipient User ID
     * @param string $title Notification title
     * @param string $message Notification message
     * @param array $templateData Additional data
     * @return array Sending result
     */
    private function sendInAppNotification($recipient, $title, $message, $templateData)
    {
        try {
            $db = $this->getDatabase();
            
            $notificationData = [
                'user_id' => $recipient,
                'title' => $title,
                'message' => $message,
                'type' => $templateData['notification_type'] ?? 'general',
                'data' => json_encode($templateData['data'] ?? []),
                'read_status' => 0,
                'created_at' => date('Y-m-d H:i:s'),
                'expires_at' => $templateData['expires_at'] ?? date('Y-m-d H:i:s', strtotime('+30 days'))
            ];
            
            $notificationId = $db->doInsert('db_notifications', $notificationData);
            
            // Send real-time notification if user is online
            $this->sendRealTimeNotification($recipient, $notificationData);
            
            return [
                'success' => true,
                'message_id' => $notificationId,
                'type' => 'in_app'
            ];
            
        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage(),
                'type' => 'in_app'
            ];
        }
    }
    
    /**
     * Send SMS notification
     * @param string $recipient Phone number
     * @param string $message SMS message
     * @param array $templateData Template data
     * @return array Sending result
     */
    private function sendSMSNotification($recipient, $message, $templateData)
    {
        try {
            // Implement SMS service integration (Twilio, AWS SNS, etc.)
            $smsService = new VSMSService();
            
            $result = $smsService->sendSMS($recipient, $message);
            
            return [
                'success' => $result['success'],
                'message_id' => $result['message_id'] ?? null,
                'type' => 'sms'
            ];
            
        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage(),
                'type' => 'sms'
            ];
        }
    }
    
    /**
     * Send webhook notification
     * @param string $recipient Webhook URL
     * @param array $data Webhook data
     * @return array Sending result
     */
    private function sendWebhookNotification($recipient, $data)
    {
        try {
            $payload = json_encode($data['payload'] ?? $data);
            
            $ch = curl_init();
            curl_setopt_array($ch, [
                CURLOPT_URL => $recipient,
                CURLOPT_POST => true,
                CURLOPT_POSTFIELDS => $payload,
                CURLOPT_HTTPHEADER => [
                    'Content-Type: application/json',
                    'User-Agent: EasyStream-Webhook/1.0'
                ],
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_TIMEOUT => 30,
                CURLOPT_FOLLOWLOCATION => true,
                CURLOPT_SSL_VERIFYPEER => false
            ]);
            
            $response = curl_exec($ch);
            $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
            $error = curl_error($ch);
            curl_close($ch);
            
            if ($error) {
                throw new Exception("cURL error: {$error}");
            }
            
            $success = $httpCode >= 200 && $httpCode < 300;
            
            return [
                'success' => $success,
                'http_code' => $httpCode,
                'response' => $response,
                'type' => 'webhook'
            ];
            
        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage(),
                'type' => 'webhook'
            ];
        }
    }
    
    /**
     * Process email template
     * @param string $template Template name
     * @param array $data Template data
     * @return string Processed template
     */
    private function processEmailTemplate($template, $data)
    {
        $templateFile = _FPATH . "f_templates/email/{$template}.tpl";
        
        if (!file_exists($templateFile)) {
            return $data['message'] ?? '';
        }
        
        $content = file_get_contents($templateFile);
        
        // Simple template variable replacement
        foreach ($data as $key => $value) {
            if (is_string($value) || is_numeric($value)) {
                $content = str_replace("{{$key}}", $value, $content);
            }
        }
        
        return $content;
    }
    
    /**
     * Send real-time notification to online user
     * @param string $userId User ID
     * @param array $notificationData Notification data
     */
    private function sendRealTimeNotification($userId, $notificationData)
    {
        try {
            // Implement WebSocket or Server-Sent Events notification
            // This is a placeholder for real-time notification system
            
            $redis = VRedis::getInstance();
            if ($redis->isConnected()) {
                $channel = "user_notifications_{$userId}";
                $redis->publish($channel, json_encode($notificationData));
            }
            
        } catch (Exception $e) {
            // Log but don't fail the job
            $this->logError('Real-time notification failed', [
                'user_id' => $userId,
                'error' => $e->getMessage()
            ]);
        }
    }
    
    /**
     * Update notification status in database
     * @param int $notificationId Notification ID
     * @param string $status Status
     * @param array $result Result data
     */
    private function updateNotificationStatus($notificationId, $status, $result)
    {
        try {
            $db = $this->getDatabase();
            
            $updateData = [
                'status' => $status,
                'sent_at' => date('Y-m-d H:i:s'),
                'result_data' => json_encode($result)
            ];
            
            $db->doUpdate('db_notification_queue', 'id', $updateData, $notificationId);
            
        } catch (Exception $e) {
            $this->logError('Failed to update notification status', [
                'notification_id' => $notificationId,
                'status' => $status,
                'error' => $e->getMessage()
            ]);
        }
    }
}

/**
 * Placeholder classes for services that need to be implemented
 */
class VEmailSender
{
    private $lastMessageId;
    
    public function sendEmail($recipient, $subject, $message, $options = [])
    {
        // Implement actual email sending logic
        // This could use PHPMailer, SwiftMailer, or native mail()
        
        $headers = "From: noreply@" . $_SERVER['HTTP_HOST'] . "\r\n";
        $headers .= "Reply-To: noreply@" . $_SERVER['HTTP_HOST'] . "\r\n";
        
        if ($options['html'] ?? false) {
            $headers .= "Content-Type: text/html; charset=UTF-8\r\n";
        }
        
        $result = mail($recipient, $subject, $message, $headers);
        $this->lastMessageId = uniqid('email_', true);
        
        return $result;
    }
    
    public function getLastMessageId()
    {
        return $this->lastMessageId;
    }
}

class VPushNotificationService
{
    public function sendNotification($recipient, $payload)
    {
        // Implement push notification service (Firebase, APNs, etc.)
        return [
            'success' => true,
            'message_id' => uniqid('push_', true)
        ];
    }
}

class VSMSService
{
    public function sendSMS($recipient, $message)
    {
        // Implement SMS service (Twilio, AWS SNS, etc.)
        return [
            'success' => true,
            'message_id' => uniqid('sms_', true)
        ];
    }
}