#!/usr/bin/env python3
"""
Permission-Based Navigation System - Implementation Summary

This script provides a comprehensive summary of the permission-based navigation
system implementation, including all features, files modified, and usage examples.

Usage:
    python permission_navigation_summary.py
"""

def print_header(title):
    """Print a formatted header"""
    print("\n" + "=" * 80)
    print(f" {title}")
    print("=" * 80)

def print_section(title):
    """Print a formatted section header"""
    print(f"\n{title}")
    print("-" * len(title))

def main():
    """Main function to display implementation summary"""
    
    print_header("PERMISSION-BASED NAVIGATION SYSTEM")
    print("Complete Implementation Summary")
    print("Author: AI Assistant")
    print("Date: 2024")
    
    print_section("OVERVIEW")
    print("""
The permission-based navigation system dynamically shows/hides navigation items
based on user access permissions. When users don't have 'Access' permission for
a module, the corresponding navigation item is completely hidden from both desktop
and mobile sidebars.

Key Features:
- Dynamic navigation based on user permissions
- Template filters for permission checking
- View-level security decorators
- Mobile and desktop support
- Production-ready deployment script
- Comprehensive validation and rollback
""")
    
    print_section("FILES MODIFIED")
    print("""
1. users/templatetags/permission_filters.py
   - Added has_module_access template filter
   - Checks user permissions for specific modules
   - Admin users automatically have all permissions

2. templates/base.html
   - Updated desktop navigation with permission checks
   - Updated mobile navigation with permission checks
   - Added permission_filters template tag load
   - Conditional rendering for all navigation items

3. users/decorators.py
   - Added module_access_required decorator
   - Provides view-level security
   - Prevents direct URL access without permissions
""")
    
    print_section("MODULES COVERED")
    modules = [
        ("dashboard", "Dashboard"),
        ("clients", "Clients"),
        ("loans", "Loans"),
        ("repayments", "All Repayments"),
        ("portfolio", "Portfolio"),
        ("reports_statements", "Reports & Statements"),
        ("documents", "Documents"),
        ("customer_documents", "Customer Documents"),
        ("payment_receipts", "Payment Receipts"),
        ("notifications", "Notifications"),
        ("settings", "Settings"),
        ("branch_settings", "Branch Settings"),
        ("system_settings", "System Settings")
    ]
    
    print("Navigation items with permission control:")
    for module, name in modules:
        print(f"  - {name:20} (module: {module})")
    
    print_section("TEMPLATE USAGE")
    print("""
Example template usage:

{% load permission_filters %}

<!-- Navigation item with permission check -->
{% if user|has_module_access:'dashboard' %}
<li>
    <a href="{% url 'dashboard' %}">Dashboard</a>
</li>
{% endif %}

<!-- Settings section with multiple permission checks -->
{% if user|has_module_access:'settings' or user|has_module_access:'branch_settings' or user|has_module_access:'system_settings' %}
<div class="settings-section">
    <!-- Settings content -->
</div>
{% endif %}
""")
    
    print_section("VIEW DECORATOR USAGE")
    print("""
Example view decorator usage:

from users.decorators import module_access_required

@module_access_required('dashboard')
def dashboard_view(request):
    # View code here
    pass

@module_access_required('reports_statements')
def reports_view(request):
    # View code here
    pass
""")
    
    print_section("DEPLOYMENT SCRIPTS")
    print("""
1. deploy_permission_navigation.py
   - Production deployment script
   - Automatic backup creation
   - Rollback capability
   - Comprehensive logging
   - Non-interactive operation

   Usage:
   python deploy_permission_navigation.py                    # Deploy
   python deploy_permission_navigation.py --dry-run          # Test
   python deploy_permission_navigation.py --rollback         # Rollback

2. validate_permission_navigation.py
   - Validation script
   - Checks deployment correctness
   - Verifies all components

   Usage:
   python validate_permission_navigation.py
""")
    
    print_section("TESTING THE SYSTEM")
    print("""
To test the permission-based navigation:

1. Deploy the system:
   python deploy_permission_navigation.py

2. Go to Staff Management -> Select a user -> User Permissions

3. Uncheck the "Access" checkbox for any module (e.g., "Reports & Statements")

4. Save the permissions

5. Log in as that user - the navigation item should be completely hidden

6. Try accessing the URL directly - should be redirected with error message
""")
    
    print_section("PERMISSION LOGIC")
    print("""
Permission checking hierarchy:

1. Admin users: Always have access to everything
2. Custom user permissions: Override role permissions
3. Role permissions: Default permissions for user role
4. No permission: Access denied

The has_permission method checks:
- User authentication
- Admin/superuser status
- Custom user permissions (with expiration check)
- Role-based permissions
- Returns False if no permission found
""")
    
    print_section("SECURITY FEATURES")
    print("""
Security measures implemented:

1. Template-level: Navigation items hidden based on permissions
2. View-level: Decorators prevent direct URL access
3. Permission hierarchy: Custom permissions override role permissions
4. Expiration support: Time-based permissions automatically checked
5. Admin override: Admin users always have full access
6. Error handling: Graceful fallbacks and user-friendly messages
""")
    
    print_section("PRODUCTION CONSIDERATIONS")
    print("""
Production deployment features:

1. Automatic backups before deployment
2. Comprehensive logging to file and console
3. Rollback capability for quick recovery
4. Dry-run mode for testing
5. Project structure validation
6. Error handling and recovery
7. Non-interactive operation for automation
""")
    
    print_section("MAINTENANCE")
    print("""
Regular maintenance tasks:

1. Monitor deployment logs
2. Test permission changes regularly
3. Update user permissions as needed
4. Verify system functionality
5. Check for any template or permission issues

The system is designed to be:
- Self-contained and reliable
- Easy to maintain and update
- Extensible for future enhancements
""")
    
    print_section("FILES CREATED")
    print("""
Additional files created:

1. deploy_permission_navigation.py
   - Production deployment script
   - Comprehensive error handling
   - Backup and rollback functionality

2. validate_permission_navigation.py
   - Validation script
   - Deployment verification
   - Component checking

3. PERMISSION_NAVIGATION_DEPLOYMENT.md
   - Complete documentation
   - Usage instructions
   - Troubleshooting guide

4. permission_navigation_summary.py
   - This summary file
   - Implementation overview
   - Feature documentation
""")
    
    print_header("IMPLEMENTATION COMPLETE")
    print("""
The permission-based navigation system is now fully implemented and ready for production use.

Key Benefits:
- Clean, intuitive user interface
- Complete access control
- Enhanced security
- Easy maintenance
- Production-ready deployment

Next Steps:
1. Deploy using the deployment script
2. Test with different user permissions
3. Monitor system performance
4. Train users on the new permission system

For support or questions, refer to the documentation files or check the deployment logs.
""")

if __name__ == '__main__':
    main()