# KSO Chandigarh Admin Panel - Notification System Enhancement

**Date: July 15, 2025**

## Overview

This document details the enhancements made to the KSO Chandigarh Admin Panel's notification system and member assignment functionality. The key objective was to implement a real-time notification system and enable member assignments to administrators for review purposes.

## Implemented Features

### 1. Real-time Notification System

#### WebSocket Server Implementation
- Created a WebSocket server using the Ratchet PHP library
- Implemented authentication for secure WebSocket connections
- Added support for real-time message broadcasting to specific users
- Created connection management with user tracking

```php
// WebSocket server class snippet
class NotificationServer implements MessageComponentInterface {
    protected $clients;
    protected $users;
    protected $conn;

    public function __construct($conn) {
        $this->clients = new \SplObjectStorage;
        $this->users = [];
        $this->conn = $conn;
        echo "Notification server started!\n";
    }

    public function onOpen(ConnectionInterface $conn) {
        $this->clients->attach($conn);
        echo "New connection! ({$conn->resourceId})\n";
    }

    public function onMessage(ConnectionInterface $from, $msg) {
        $data = json_decode($msg, true);
        
        // Handle authentication
        if (isset($data['type']) && $data['type'] === 'auth') {
            $this->authenticateUser($from, $data);
            return;
        }
        
        // Only allow authenticated messages
        if (!isset($this->users[$from->resourceId])) {
            $from->send(json_encode([
                'type' => 'error',
                'message' => 'Not authenticated'
            ]));
            return;
        }
        
        // Handle other message types...
    }
}
```

#### WebSocket Server Management
- Created a WebSocket server manager script for easy server management
- Added commands for starting, stopping, restarting, and checking server status
- Implemented logging for server events and errors

#### Client-Side Notification Handling
- Implemented a JavaScript notification system for handling real-time notifications
- Added connection management with automatic reconnection
- Created message handlers for different notification types

```javascript
// Client-side WebSocket connection snippet
class NotificationSystem {
    constructor() {
        this.socket = null;
        this.connected = false;
        this.reconnectAttempts = 0;
        this.maxReconnectAttempts = 5;
        this.reconnectInterval = 3000;
        this.soundEnabled = true;
        this.browserNotificationsEnabled = true;
        this.init();
    }
    
    init() {
        this.connectWebSocket();
        this.initSoundNotifications();
        this.initBrowserNotifications();
    }
    
    connectWebSocket() {
        try {
            this.socket = new WebSocket('ws://localhost:8080');
            
            this.socket.onopen = () => {
                console.log('WebSocket connected');
                this.connected = true;
                this.reconnectAttempts = 0;
                this.authenticate();
            };
            
            this.socket.onmessage = (event) => {
                this.handleMessage(JSON.parse(event.data));
            };
            
            this.socket.onclose = () => {
                this.connected = false;
                this.handleDisconnect();
            };
            
            this.socket.onerror = (error) => {
                console.error('WebSocket error:', error);
            };
        } catch (error) {
            console.error('Error creating WebSocket connection:', error);
            this.handleDisconnect();
        }
    }
}
```

### 2. Member Assignment System

#### Database Structure
- Utilized `admin_assignments` table for storing member assignments
- Used `member_approval_history` table for tracking assignment status changes
- Implemented relational structure for member-admin assignments

#### Assignment Service Layer
- Created `AssignmentService` class for handling assignment logic
- Implemented methods for creating, updating, and retrieving assignments
- Added status management (active, completed, cancelled, overdue)

```php
// Assignment Service class snippet
class AssignmentService {
    private $conn;
    private $notificationService;
    
    public function __construct($conn) {
        $this->conn = $conn;
        $this->notificationService = new NotificationService($conn);
    }
    
    public function assignMember($member_id, $admin_id, $assigned_by, $assignment_type, $priority, $due_date = null, $notes = '') {
        try {
            $this->conn->begin_transaction();
            
            // Create assignment
            $stmt = $this->conn->prepare("
                INSERT INTO admin_assignments 
                (member_id, assigned_to, assigned_by, assignment_type, priority, due_date, notes, status, created_at) 
                VALUES (?, ?, ?, ?, ?, ?, ?, 'active', NOW())
            ");
            
            $stmt->bind_param('iiissss', $member_id, $admin_id, $assigned_by, $assignment_type, $priority, $due_date, $notes);
            $stmt->execute();
            
            $assignment_id = $this->conn->insert_id;
            
            // Log history
            $this->logAssignmentHistory($assignment_id, 'created', $assigned_by, $notes);
            
            // Send notification
            $this->notifyAssignment($assignment_id, $member_id, $admin_id, $assigned_by);
            
            $this->conn->commit();
            return $assignment_id;
        } catch (Exception $e) {
            $this->conn->rollback();
            throw $e;
        }
    }
    
    // Other methods...
}
```

#### Assignment API Endpoints
- Created API endpoints for assignment operations
- Implemented secure access control for assignment actions
- Added validation for assignment data

### 3. Notification Service Layer

#### Notification Manager
- Created `NotificationService` class for handling notification logic
- Implemented methods for creating, retrieving, and managing notifications
- Added support for multiple notification types and priorities

```php
// Notification Service class snippet
class NotificationService {
    private $conn;
    
    public function __construct($conn) {
        $this->conn = $conn;
    }
    
    public function createNotification($title, $message, $type, $priority, $target_audience, $created_by, $specific_recipients = null) {
        try {
            $this->conn->begin_transaction();
            
            // Create notification
            $stmt = $this->conn->prepare("
                INSERT INTO notifications 
                (title, message, type, priority, target_audience, created_by, created_at) 
                VALUES (?, ?, ?, ?, ?, ?, NOW())
            ");
            
            $stmt->bind_param('sssssi', $title, $message, $type, $priority, $target_audience, $created_by);
            $stmt->execute();
            
            $notification_id = $this->conn->insert_id;
            
            // Add recipients based on target audience
            $this->addRecipients($notification_id, $target_audience, $specific_recipients);
            
            // Send real-time notification
            $this->sendRealTimeNotification($notification_id);
            
            $this->conn->commit();
            return $notification_id;
        } catch (Exception $e) {
            $this->conn->rollback();
            throw $e;
        }
    }
    
    // Other methods...
}
```

#### Notification API Endpoints
- Created comprehensive API endpoints for notification operations
- Implemented secure access control for notification actions
- Added support for filtering and sorting notifications

### 4. UI Enhancements

#### Tabbed Interface
- Updated the notifications.php page with a modern tabbed interface
- Created separate tabs for notifications, assignments, and settings
- Implemented responsive design for all screen sizes

#### Interactive Components
- Added interactive data tables for notifications and assignments
- Implemented filter controls for viewing different statuses
- Created status indicators with color-coding

#### Modal Dialogs
- Created modal dialogs for creating and viewing notifications
- Implemented assignment creation and completion modals
- Added confirmation dialogs for critical actions

#### Notification Settings
- Added user-configurable notification settings
- Implemented toggles for different notification types
- Created controls for notification channels (browser, sound, email)

## Technical Implementation

### API Endpoints Created

#### Notification Endpoints
- `api/notifications/list.php` - Lists notifications for the current user
- `api/notifications/create.php` - Creates a new notification
- `api/notifications/get.php` - Gets a single notification
- `api/notifications/mark_read.php` - Marks a notification as read
- `api/notifications/delete.php` - Deletes a notification
- `api/notifications/settings.php` - Manages notification settings
- `api/notifications/stats.php` - Gets notification statistics
- `api/notifications/recent.php` - Gets recent notifications for the navbar

#### Assignment Endpoints
- `api/assignments/list.php` - Lists assignments
- `api/assignments/create.php` - Creates a new assignment
- `api/assignments/get.php` - Gets a single assignment
- `api/assignments/update_status.php` - Updates assignment status

### JavaScript Files Created

- `dist/js/notifications/notification-system.js` - Core notification system
  - WebSocket connection management
  - Notification display and handling
  - Sound and browser notification integration
  
- `dist/js/notifications/notifications-page.js` - Notifications page functionality
  - DataTable initialization and configuration
  - Modal handling and form submissions
  - Assignment management functions

### Server Components

- `services/websocket/websocket_server.php` - WebSocket server implementation
- `services/websocket/websocket_manager.php` - Server management script
- `services/websocket/start_websocket.bat` - Windows batch file for starting the server
- `services/NotificationService.php` - Notification business logic
- `services/AssignmentService.php` - Assignment business logic

## Key Features

1. **Real-time Notifications**
   - Instant delivery via WebSocket
   - Persistent storage for offline users
   - Read/unread status tracking

2. **Multi-channel Notifications**
   - In-app notifications
   - Browser notifications (with permission handling)
   - Sound alerts (configurable)
   - Email notifications (optional)

3. **Notification Types**
   - Information
   - Success
   - Warning
   - Error
   - Announcement
   - Event
   - Payment
   - Membership

4. **Notification Priorities**
   - Low
   - Normal
   - High
   - Urgent

5. **Member Assignment Workflow**
   - Assignment creation with due dates
   - Status tracking (active, completed, cancelled, overdue)
   - Assignment history with audit trail
   - Assignment types (review, approval, verification, follow-up)

6. **User Preferences**
   - Configurable notification channels
   - Notification type filtering
   - Sound notification toggling

## Setup and Configuration

- Created detailed documentation for setting up the notification system
- Added instructions for starting and managing the WebSocket server
- Documented security considerations and best practices
- Provided troubleshooting guidance

## Testing

The enhanced notification system and member assignment functionality have been tested for:

- Real-time notification delivery
- Browser notification display
- Sound alert functionality
- Assignment workflow (creation, update, completion)
- Status tracking and history recording
- UI responsiveness and compatibility
- WebSocket connection stability and reconnection

## Conclusion

The notification system and member assignment functionality are now fully operational with real-time capabilities. Administrators can receive instant notifications through multiple channels and assign members to other admins for review purposes. The system provides a comprehensive solution for internal communication and task management within the KSO Chandigarh Admin Panel.

This enhancement significantly improves the user experience and operational efficiency of the admin panel, allowing for better coordination and faster response times among administrative staff.
