# Phase 3 - Application CRUD Operations ✅ COMPLETED

## Overview
Phase 3 implements the complete application CRUD operations, allowing users to submit training applications via the frontend and administrators to manage them through the admin dashboard.

## ✅ COMPLETED TASKS

### 1. Application Model (`api/models/Application.php`)
- **Create Application**: Insert new applications with validation
- **Read Operations**: Get applications by ID, email, or list all with filtering
- **Update Operations**: Update application details and status
- **Delete Operations**: Soft delete applications
- **Status Management**: Change application status (pending → reviewed → code_sent → registered)
- **Registration Codes**: Generate and assign registration codes
- **Search & Statistics**: Search applications and get statistics
- **Duplicate Prevention**: Check for existing pending applications

### 2. Application API Routes (`api/routes/applications.php`)
- **POST** `/applications.php?action=create` - Submit new application
- **GET** `/applications.php?action=list` - List all applications (admin only)
- **GET** `/applications.php?action=get&id=123` - Get specific application (admin only)
- **PUT** `/applications.php?action=update&id=123` - Update application (admin only)
- **DELETE** `/applications.php?action=delete&id=123` - Delete application (admin only)
- **PUT** `/applications.php?action=update_status&id=123&status=pending` - Update status (admin only)
- **PUT** `/applications.php?action=set_code&id=123` - Set registration code (admin only)
- **GET** `/applications.php?action=search&q=searchterm` - Search applications (admin only)
- **GET** `/applications.php?action=statistics` - Get statistics (admin only)

### 3. Validation Middleware (`api/middleware/ValidationMiddleware.php`)
- **Application Data Validation**: Validate required fields and formats
- **Email Validation**: Ensure valid email format
- **Phone Validation**: Check phone number length
- **Date Validation**: Validate date format
- **Track Validation**: Validate track selection
- **Sanitization**: Clean and sanitize all input data

### 4. Rate Limiting (`api/middleware/RateLimitMiddleware.php`)
- **Application Rate Limiting**: 3 applications per hour per IP
- **Prevent Spam**: Protect against excessive application submissions
- **Automatic Cleanup**: Clean up old rate limit entries

### 5. Frontend Integration
- **API Client** (`src/lib/api.ts`): Added application API functions
- **Application Store** (`src/lib/applications-store.ts`): Replaced localStorage with real API calls
- **Apply Page** (`src/routes/apply.tsx`): Updated to use real API for submission
- **Dashboard** (`src/routes/admin.dashboard.tsx`): Updated to load applications from API

## 🔧 SETUP INSTRUCTIONS

### 1. Database Schema
The applications table is already included in the existing schema. No additional database changes needed.

### 2. Backend Configuration
The backend is already configured. Ensure `api/.env` has the correct database credentials.

### 3. Testing Application Submission

**Via curl:**
```bash
curl -X POST 'http://localhost:8000/applications.php?action=create' \
  -H 'Content-Type: application/json' \
  -d '{"full_name":"Test User","email":"test@example.com","phone":"1234567890","dob":"1990-01-01","location":"Lagos","track":"solar_energy","background":"Test background"}'
```

**Via Frontend:**
1. Navigate to `http://localhost:8080/apply`
2. Fill out the application form
3. Submit the form
4. The application will be stored in the database

### 4. Testing Admin Dashboard

**Via curl (with authentication):**
```bash
# First login to get token
curl -X POST 'http://localhost:8000/auth.php?action=login' \
  -H 'Content-Type: application/json' \
  -d '{"email":"admin@revlinks.ng","password":"admin123"}'

# Then use the token to get applications
curl 'http://localhost:8000/applications.php?action=list' \
  -H 'Authorization: Bearer YOUR_TOKEN'
```

**Via Frontend:**
1. Login as admin at `http://localhost:8080/admin/login`
2. Navigate to `http://localhost:8080/admin/dashboard`
3. View submitted applications
4. Change application status
5. Send registration codes

## 🔐 SECURITY FEATURES

### Application Security
- **Input Validation**: All fields validated before database insertion
- **Rate Limiting**: 3 applications per hour per IP address
- **Duplicate Prevention**: Check for existing pending applications
- **SQL Injection Prevention**: Prepared statements for all database queries
- **XSS Protection**: Output escaping for user input

### Admin Security
- **Authentication Required**: All admin operations require authentication
- **Authorization**: Different permission levels for different operations
- **Activity Logging**: All admin actions logged with IP and user agent
- **Soft Delete**: Applications are soft deleted, not permanently removed

## 📋 APPLICATION STATUS FLOW

1. **pending_review** - Application submitted, awaiting review
2. **under_review** - Application being reviewed by admin
3. **code_sent** - Registration code sent to applicant
4. **registered** - Applicant registered successfully
5. **payment_pending** - Payment initiated
6. **payment_successful** - Payment completed
7. **enrolled** - Applicant enrolled in training

## 🎯 STATUS MAPPING

Frontend → Database Status Mapping:
- `pending` → `pending_review`
- `reviewed` → `under_review`
- `code_sent` → `code_sent`
- `registered` → `registered`

## 📊 API ENDPOINTS

### Public Endpoints
- **POST** `/applications.php?action=create` - Submit application (no auth required)

### Admin Endpoints (Authentication Required)
- **GET** `/applications.php?action=list` - List all applications
- **GET** `/applications.php?action=list&status=pending` - Filter by status
- **GET** `/applications.php?action=get&id=123` - Get specific application
- **PUT** `/applications.php?action=update&id=123` - Update application
- **DELETE** `/applications.php?action=delete&id=123` - Delete application
- **PUT** `/applications.php?action=update_status&id=123&status=pending` - Update status
- **PUT** `/applications.php?action=set_code&id=123` - Set registration code
- **GET** `/applications.php?action=search&q=searchterm` - Search applications
- **GET** `/applications.php?action=statistics` - Get statistics

## 🐛 TROUBLESHOOTING

### Application Submission Fails
- Check rate limiting: Wait 1 hour if you submitted too many applications
- Check validation: Ensure all required fields are properly filled
- Check database: Ensure database connection is working

### Applications Not Showing in Dashboard
- Check authentication: Ensure you're logged in as admin
- Check API URL: Ensure VITE_API_URL is set correctly
- Check browser console: Look for API errors

### Status Updates Not Working
- Check permissions: Ensure you have admin role
- Check browser console: Look for API errors
- Check application ID: Ensure correct application ID

## 📝 NOTES

- The frontend UI remains unchanged
- All existing functionality preserved
- Demo functions kept as fallback in applications-store.ts
- Session management uses secure httpOnly cookies
- JWT tokens stored in cookies for API requests
- Rate limiting prevents spam submissions
- Comprehensive logging for security auditing
- Compatible with standard cPanel hosting
- PHP 8+ required
- MySQL with PDO required

## ✅ PHASE 3 COMPLETE

Application CRUD system is fully implemented and tested. Ready for Phase 4 approval:
- Phase 4: Registration code system and email integration
- Phase 5: Paystack payment integration

## 🔄 FRONTEND BACKWARD COMPATIBILITY

The frontend still has the demo functions available in `applications-store.ts`:
- `adminLoginDemo()` - Demo authentication (fallback)
- `adminLoggedInDemo()` - Demo auth check (fallback)
- `adminLogoutDemo()` - Demo logout (fallback)

Real API functions are used by default:
- `adminLogin()` - Real authentication
- `adminLoggedIn()` - Real auth check
- `adminLogout()` - Real logout
- `loadApplications()` - Load from API
- `addApplication()` - Submit to API
- `sendRegistrationCode()` - Set code via API
- `setStatus()` - Update status via API

This ensures smooth transition and fallback support.
