# Phase 7: Additional Features - API Documentation

## Status: Partially Complete - Backend APIs Ready

Phase 7 features have been **partially implemented** with complete backend API support. The APIs are fully functional and ready for frontend UI integration.

---

## ✅ Implemented Features (Backend APIs)

### 1. Connection Management
**API:** `api/connections.php`

**Features:**
- Send connection requests
- Accept/reject requests
- View connections (accepted, pending, sent)
- Remove connections

**Status:** ✅ Backend Complete | ⏳ UI Pending

**UI Pages Needed:**
- `researcher/connections.php` - Manage connections
- `researcher/connection-requests.php` - Handle requests

---

### 2. Collaborator Management
**API:** `api/collaborators.php`

**Features:**
- Add collaborators to studies
- Manage collaborator roles
- Accept/reject collaboration invitations
- Remove collaborators

**Status:** ✅ Backend Complete | ⏳ UI Pending

**UI Pages Needed:**
- `researcher/manage-collaborators.php` - Collaborator management interface
- Integration with existing `researcher/collaborations.php`

---

### 3. Messaging System
**API:** `api/chat.php`

**Features:**
- One-on-one conversations
- Send/receive messages
- Message history
- Auto-mark as read
- Delete messages

**Status:** ✅ Backend Complete | ⏳ UI Pending

**UI Pages Needed:**
- `researcher/chat.php` - Real-time chat interface
- Integration with existing `researcher/messages.php`

---

### 4. Notification System
**API:** `api/notifications.php`

**Features:**
- Fetch notifications
- Mark as read (single/all)
- Delete notifications
- Unread count tracking

**Status:** ✅ Backend Complete | ⏳ UI Pending

**UI Pages Needed:**
- Enhanced `researcher/notifications.php` with real-time updates
- Notification dropdown in header

---

### 5. File Upload System
**API:** `api/upload.php`

**Features:**
- Upload files (documents, images)
- File type validation
- Size limit enforcement
- Organized storage

**Status:** ✅ Backend Complete | ⏳ UI Pending

**UI Pages Needed:**
- File upload widgets in study/publication forms
- File manager interface

---

### 6. Search System
**API:** `api/search.php`

**Features:**
- Unified search across all content
- Type-specific search
- Pagination support

**Status:** ✅ Backend Complete | ⏳ UI Pending

**UI Pages Needed:**
- `public/search-results.php` - Search results page
- Search bar in header with autocomplete

---

### 7. Study Management
**API:** `api/studies.php`

**Features:**
- CRUD operations for studies
- Status management
- Ownership verification

**Status:** ✅ Backend Complete | ⏳ UI Pending

**UI Pages Needed:**
- Enhanced study management interfaces
- Study approval workflow UI (admin)

---

## ⏳ Pending Features (Not Yet Implemented)

### Study Management
- [ ] **Document Version Control** - Track document changes over time
- [ ] **Study Approval Workflow** - Admin approval process UI
- [ ] **Export Functionality** - Export studies to PDF/Excel

### Networking Features
- [ ] **Follow/Unfollow System** - Follow researchers without connection
- [ ] **Contact Approval Workflow** - UI for contact management
- [ ] **Researcher Recommendations** - AI/algorithm-based suggestions

### Messaging System
- [ ] **Group Chats** - Multi-user conversations
- [ ] **File Sharing in Chat** - Attach files to messages
- [ ] **Real-time Notifications** - WebSocket/polling for live updates

### Publication System
- [ ] **Publication Submission** - Form to submit publications
- [ ] **Moderation Queue** - Admin review interface
- [ ] **Commenting System** - Comments on publications
- [ ] **External Link Integration** - DOI, PubMed integration

---

## 🔌 API Integration Guide

### Authentication
All APIs require active user session:

```php
// Check if user is logged in
if (!isLoggedIn()) {
    // Redirect to login or return 401
}
```

### Making API Calls

**JavaScript (Fetch API):**
```javascript
// GET Request
fetch('/obgyn-research-platform/api/notifications.php?limit=20')
    .then(response => response.json())
    .then(data => console.log(data));

// POST Request
fetch('/obgyn-research-platform/api/connections.php', {
    method: 'POST',
    headers: {'Content-Type': 'application/json'},
    body: JSON.stringify({user_id: 5})
})
.then(response => response.json())
.then(data => console.log(data));
```

**jQuery (AJAX):**
```javascript
// GET Request
$.ajax({
    url: '/obgyn-research-platform/api/notifications.php',
    method: 'GET',
    data: {limit: 20},
    success: function(response) {
        console.log(response);
    }
});

// POST Request
$.ajax({
    url: '/obgyn-research-platform/api/connections.php',
    method: 'POST',
    contentType: 'application/json',
    data: JSON.stringify({user_id: 5}),
    success: function(response) {
        console.log(response);
    }
});
```

---

## 📋 Implementation Roadmap

### Phase 7.1: UI for Existing APIs (Priority)
**Estimated Effort:** 1-2 weeks

1. Connection management UI
2. Chat interface with real-time updates
3. Enhanced notification system
4. File upload widgets
5. Search results page

### Phase 7.2: New Features (Medium Priority)
**Estimated Effort:** 2-3 weeks

1. Follow/unfollow system
2. Publication submission
3. Commenting system
4. Study approval workflow

### Phase 7.3: Advanced Features (Low Priority)
**Estimated Effort:** 3-4 weeks

1. Document version control
2. Export functionality (PDF/Excel)
3. Group chats
4. Researcher recommendations
5. Moderation queue

---

## 🎯 Quick Start for Developers

### Adding a New UI Page

1. **Create the page file:**
```php
<?php
require_once '../config/config.php';
requireLogin(); // Ensure user is logged in

$pageTitle = 'Page Title';
include '../templates/header.php';
?>

<!-- Your content here -->
<div class="container">
    <h1>Page Content</h1>
</div>

<script>
// API calls here
fetch('/obgyn-research-platform/api/endpoint.php')
    .then(response => response.json())
    .then(data => {
        // Handle response
    });
</script>

<?php include '../templates/footer.php'; ?>
```

2. **Add navigation link** in `researcher/sidebar.php` or `templates/header.php`

3. **Test the integration** with the corresponding API

---

## 📊 API Coverage Summary

| Feature Category | APIs Ready | UI Ready | Status |
|-----------------|------------|----------|---------|
| Connections | ✅ | ❌ | 50% |
| Collaborators | ✅ | ❌ | 50% |
| Messaging | ✅ | ❌ | 50% |
| Notifications | ✅ | ⚠️ | 75% |
| File Upload | ✅ | ❌ | 50% |
| Search | ✅ | ❌ | 50% |
| Studies | ✅ | ⚠️ | 75% |

**Legend:**
- ✅ Complete
- ⚠️ Partial
- ❌ Not Started

---

## 🔗 Related Documentation

- [API Endpoints Documentation](../api/) - Individual API files
- [Database Schema](../database/schema.sql) - Database structure
- [Security Guidelines](../includes/security.php) - Security functions
- [Authentication System](../includes/auth.php) - Auth functions

---

## 📝 Notes for Future Development

1. **Real-time Features:** Consider implementing WebSockets or Server-Sent Events for real-time notifications and chat
2. **Caching:** Implement caching for frequently accessed data (connections, notifications)
3. **Rate Limiting:** Add rate limiting to prevent API abuse
4. **API Versioning:** Consider versioning APIs (v1, v2) for future updates
5. **Documentation:** Generate API documentation using tools like Swagger/OpenAPI

---

**Last Updated:** January 10, 2025  
**Status:** Backend APIs Complete - Ready for UI Integration  
**Next Phase:** Phase 8 - CMS & Content Management
