# Enhanced Streamlit Application Features

## 🆕 New Features Added

### 1. Authentication System
- **Secure Login**: Multi-user authentication with role-based access control
- **Session Management**: Automatic session state tracking
- **Demo Credentials**:
  - Nurse: `nurse` / `nurse2025`
  - Clinician: `clinician` / `clinician2025`
  - Admin: `admin` / `admin2025`

### 2. Chat History Persistence
- **Automatic Saving**: Chat conversations are automatically saved per user
- **History Retrieval**: Chat history loads when user logs back in
- **Clear History**: Option to clear chat history anytime
- **Local Storage**: Uses JSON file-based storage (`.chat_history.json`)

### 3. Role-Based Access Control (RBAC)
Different permission levels for different user roles:

| Feature | Nurse | Clinician | Admin |
|---------|-------|-----------|-------|
| Validate Notes | ✅ | ✅ | ✅ |
| View History | ✅ | ✅ | ✅ |
| Export Chat | ✅ | ❌ | ✅ |
| Manage Users | ❌ | ❌ | ✅ |

### 4. User Interface Improvements
- **Sidebar Navigation**: User info, logout button, knowledge base status
- **Chat Interface**: Interactive chat with message history
- **Quick Actions**: 
  - Clear chat history
  - Export conversations as JSON
  - View chat statistics
- **Admin Panel**: User management interface (for admins only)

### 5. Data Export
- **JSON Export**: Download chat conversations in JSON format
- **Timestamped Files**: Automatically named with username and timestamp

## 🚀 Running the Enhanced App

### Prerequisites
```bash
pip install -r requirements.txt
```

### Initialize Knowledge Base
```bash
# Download FoNS articles
python harvest_fons.py

# Build vector database
python ingest_fast.py
```

### Start the Application
```bash
streamlit run app.py
```

The app will be available at `http://localhost:8501`

## 🔐 Security Considerations

### Current Implementation (Demo)
The demo version uses hardcoded credentials for testing purposes.

### Production Deployment
For production use, integrate with:
- **Azure AD** for enterprise authentication
- **OAuth 2.0** providers (Google, GitHub)
- **Auth0** for managed authentication
- **Database** for encrypted credential storage

### Recommended Changes for Production
1. Remove hardcoded passwords
2. Implement JWT token-based authentication
3. Use environment variables for sensitive data
4. Add rate limiting for login attempts
5. Implement password hashing (bcrypt)
6. Add audit logging for all actions
7. Use HTTPS only
8. Implement session timeout

## 📊 Chat History Storage

### Format
Chat history is stored in `.chat_history.json`:
```json
{
  "nurse": [
    {"role": "user", "content": "What is person-centered care?"},
    {"role": "assistant", "content": "...response..."}
  ],
  "clinician": [
    {"role": "user", "content": "...question..."},
    {"role": "assistant", "content": "...response..."}
  ]
}
```

### Backup Recommendations
- Regularly backup `.chat_history.json`
- Consider implementing database storage for large-scale deployments
- Add encryption for stored conversations

## 🎯 Future Enhancements

### Planned Features
1. **Database Integration**: Replace JSON storage with PostgreSQL/MongoDB
2. **Advanced Analytics**: Dashboard with usage statistics
3. **Audit Logging**: Track all user actions for compliance
4. **Multi-tenancy**: Support multiple organizations
5. **API Layer**: REST API for programmatic access
6. **Mobile App**: React Native mobile application
7. **Real-time Collaboration**: Multiple users viewing same chat
8. **AI-powered Suggestions**: Contextual recommendations
9. **Document Upload**: Process patient documents directly
10. **FHIR Integration**: Direct integration with FHIR resources

## 📝 User Roles Explained

### Nurse Role
- Access to clinical validation
- Can view and export chat history
- Intended for frontline nursing staff

### Clinician Role
- Access to clinical validation
- Can view chat history (no export)
- Intended for physicians and specialist staff

### Admin Role
- All permissions
- User management capabilities
- System configuration access
- Intended for system administrators

## 🆘 Troubleshooting

### Issue: Chat history not loading
- Check if `.chat_history.json` exists
- Verify file permissions
- Ensure JSON is valid

### Issue: Knowledge base offline
- Run `python ingest_fast.py` to rebuild database
- Check if `chroma_db_fons` directory exists
- Verify Azure OpenAI credentials

### Issue: Login fails
- Verify credentials match those in `DEFAULT_USERS`
- Check for typos in username/password
- Try refreshing the page

## 📞 Support

For issues, questions, or feature requests, please open an issue on GitHub:
https://github.com/ClinyQAi/open-nursing-core-ig/issues