Refactor documentation: update active context, progress, project brief, system patterns, tech context to reflect code quality maintenance and testing improvements
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					 5 changed files with 169 additions and 87 deletions
				
			
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## Current Work Focus
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**Phase 3 Complete with Save Confirmation Enhancement**: The hosts TUI application now has a complete edit mode foundation with permission management, entry manipulation, safe file operations, and professional save confirmation functionality. All keyboard shortcuts are implemented and tested. The application is ready for Phase 4 advanced edit features.
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**Post-Phase 3 Code Quality Maintenance**: The hosts TUI application has successfully completed Phase 3 with full edit mode foundation, save confirmation functionality, and comprehensive testing (149 tests). However, 20 minor linting issues (unused imports and variables) require cleanup before proceeding to Phase 4 advanced features.
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## Immediate Next Steps
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### Priority 1: Code Quality Cleanup
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1. **Fix linting issues**: Run `uv run ruff check --fix` to address 20 unused import and variable warnings
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2. **Validate fixes**: Ensure all tests still pass (149 tests) after cleanup
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3. **Confirm application functionality**: Test that `uv run hosts` still works perfectly
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4. **Commit clean state**: Create commit with "Fix linting issues" once cleanup is complete
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### Priority 2: Phase 4 Planning
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Once code quality is restored:
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1. **Advanced entry operations**: Add/delete entries with validation
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2. **Search functionality**: Find entries by hostname or IP address  
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3. **Bulk operations**: Select and modify multiple entries
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4. **Help modal**: Proper modal dialog with keyboard shortcuts
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## Memory Bank Update Summary
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### Files Updated
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- ✅ **activeContext.md**: Updated current focus and next steps
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- ✅ **progress.md**: Corrected test count (149 vs 97), added code quality status
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- ✅ **techContext.md**: Updated development workflow and code quality status
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- ✅ **systemPatterns.md**: Added edit mode and permission management patterns
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- ✅ **projectbrief.md**: Updated test coverage details and current status
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### Key Corrections Made
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- **Test count**: Updated from 97 to 149 tests across all files
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- **Code quality**: Noted 20 linting issues requiring cleanup
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- **Project stage**: Clarified completion of Phase 3 with save confirmation
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- **Current status**: Maintenance phase before Phase 4 development
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- **Recent commits**: Reflected completion of save confirmation modal
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### Architecture Insights Confirmed
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- **Textual framework**: Excellent for complex TUI applications with modal dialogs
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- **Layered architecture**: Proven effective for maintainable, testable code
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- **Test-driven development**: 149 comprehensive tests enable confident refactoring
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- **Configuration system**: JSON-based persistence working reliably
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- **Permission management**: Sudo handling implemented safely and securely
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The memory bank now accurately reflects the current state of the project, ready for the next phase of development after code quality maintenance.
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## Recent Changes
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			@ -12,7 +52,7 @@
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- ✅ **No auto-save behavior**: Changes are only saved when explicitly confirmed by the user
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- ✅ **Graceful exit handling**: ESC key in edit entry mode now triggers save confirmation instead of auto-exiting
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- ✅ **Validation integration**: Full validation before saving with clear error messages for invalid data
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- ✅ **Comprehensive testing**: 13 new tests for save confirmation functionality (161 total tests)
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- ✅ **Comprehensive testing**: Save confirmation functionality fully tested (149 total tests)
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- ✅ **Modal keyboard shortcuts**: Save (S), Discard (D), Cancel (ESC) with intuitive button labels
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### Phase 2 Implementation Complete
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			@ -23,7 +63,7 @@
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- ✅ **Rich visual interface**: Color-coded entries with professional DataTable styling
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- ✅ **Interactive column headers**: Click headers to sort data with visual feedback
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- ✅ **Enhanced status bar**: Detailed information including entry counts and file path
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- ✅ **Comprehensive testing**: 97 tests covering all functionality including new features
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- ✅ **Comprehensive testing**: 149 tests covering all functionality including new features
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### Current Project State
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- **Production-ready application**: `uv run hosts` launches polished TUI with advanced features
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			@ -31,38 +71,24 @@
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- **Professional visual design**: Color-coded entries, zebra striping, and rich text styling
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- **Interactive sorting**: Click column headers or use keyboard shortcuts to sort data
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- **Intelligent filtering**: Hide default system entries based on user preference
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- **Comprehensive test coverage**: 97 tests with 100% pass rate covering all components
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- **Perfect code quality**: All linting and formatting standards maintained
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- **Robust architecture**: Clean layered design ready for edit mode extension
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- **Comprehensive test coverage**: 149 tests with 100% pass rate covering all components
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- **Code quality maintenance needed**: 20 linting issues (unused imports/variables) require cleanup
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- **Robust architecture**: Clean layered design ready for Phase 4 advanced features
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## Next Steps
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### Phase 3: Edit Mode Foundation (Current Priority)
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1. **Permission management system**:
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   - Implement sudo request and validation
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   - Edit mode toggle with proper security handling
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   - Permission validation and error handling
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   - Graceful fallback for permission denied scenarios
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### Immediate Priority: Code Quality Cleanup
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1. **Fix linting issues**: Address 20 unused import and variable warnings
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   - Remove unused imports in core/config.py, test files
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   - Clean up unused variables in exception handling
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   - Run `uv run ruff check --fix` to auto-fix issues
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2. **Basic editing operations**:
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   - Toggle entries active/inactive with visual feedback
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   - Entry editing interface for IP addresses, hostnames, and comments
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   - Real-time validation of IP addresses and hostnames
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   - Safe state management during editing
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2. **Code quality validation**:
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   - Ensure all ruff checks pass with zero issues
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   - Maintain perfect test coverage (149 tests passing)
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   - Verify application functionality after cleanup
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3. **File safety and backup**:
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   - Automatic backup before any modifications
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   - Atomic file operations with rollback capability
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   - Validation before writing changes to disk
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   - Error recovery and restoration mechanisms
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4. **Edit mode user interface**:
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   - Clear visual indicators for edit mode vs read-only mode
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   - Edit forms and dialogs for entry modification
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   - Confirmation dialogs for destructive operations
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   - Enhanced status feedback during edit operations
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### Phase 4: Advanced Edit Features (Future)
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### Phase 4: Advanced Edit Features (Next Phase)
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1. **Advanced editing operations**:
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   - Add new entries with validation
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   - Delete entries with confirmation
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			@ -96,8 +122,37 @@
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- ✅ **Error handling**: Graceful degradation and user feedback throughout
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- ✅ **Modal pattern**: Professional modal dialogs with proper lifecycle management
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- ✅ **Configuration pattern**: Centralized settings with persistence and defaults
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- 🔄 **Command pattern**: Planned for Phase 3 edit operations with undo/redo
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- 🔄 **Observer pattern**: Will implement for state change notifications in edit mode
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- ✅ **Command pattern**: Implemented for edit operations with save confirmation
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- 🔄 **Observer pattern**: Will implement for state change notifications in advanced features
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## Important Patterns and Preferences
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### Code Quality Standards
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- **Zero tolerance for linting issues**: All ruff checks must pass before commits
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- **Comprehensive testing**: Maintain 100% test pass rate with meaningful coverage
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- **Type safety**: Full type hints throughout codebase
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- **Documentation**: Clear docstrings and inline comments for complex logic
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- **Error handling**: Graceful degradation with informative user feedback
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### Development Workflow
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- **Test-driven development**: Write tests before implementing features
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- **Incremental implementation**: Small, focused changes with immediate testing
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- **Clean commits**: Each commit should represent a complete, working feature
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- **Memory bank maintenance**: Update documentation after significant changes
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## Learnings and Project Insights
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### Technical Insights
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- **Textual framework**: Excellent for rich TUI applications with reactive state management
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- **Modal system**: Professional dialog implementation requires careful focus and lifecycle management
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- **File operations**: Atomic operations and backup systems essential for system file modification
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- **Permission management**: Sudo handling requires careful security consideration and user experience design
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### Process Insights
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- **Memory bank value**: Documentation consistency crucial for maintaining project context
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- **Testing strategy**: Comprehensive test coverage enables confident refactoring and feature addition
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- **Code quality**: Automated linting and formatting tools essential for maintaining standards
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- **Incremental development**: Small, focused phases enable better quality and easier debugging
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### Technical Constraints Confirmed
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- ✅ **Python 3.13+**: Excellent choice with modern features working perfectly
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			@ -39,16 +39,6 @@
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- ✅ **Modal system**: Proper modal dialogs with keyboard bindings
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- ✅ **Configuration persistence**: Settings saved to ~/.config/hosts-manager/
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### Documentation
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- ✅ **Project brief**: Comprehensive project definition and requirements
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- ✅ **Product context**: User experience goals and problem definition
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- ✅ **Technical context**: Technology stack and development setup
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- ✅ **System patterns**: Architecture, design patterns, and implementation paths
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- ✅ **Active context**: Current work focus and next steps
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## What's Left to Build
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### Phase 3: Edit Mode Foundation ✅ COMPLETE
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- ✅ **Permission management**: Sudo request and management with PermissionManager class
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- ✅ **Edit mode toggle**: Switch between read-only and edit modes with 'e' key
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			@ -68,6 +58,20 @@
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- ✅ **Change detection**: Intelligent tracking of original vs. current entry values
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- ✅ **No auto-save**: Changes saved only when explicitly confirmed by user
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### Documentation
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- ✅ **Project brief**: Comprehensive project definition and requirements
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- ✅ **Product context**: User experience goals and problem definition
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- ✅ **Technical context**: Technology stack and development setup
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- ✅ **System patterns**: Architecture, design patterns, and implementation paths
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- ✅ **Active context**: Current work focus and next steps
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## What's Left to Build
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### Immediate Priority: Code Quality Cleanup
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- ❌ **Fix linting issues**: Address 20 unused import and variable warnings
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- ❌ **Code quality validation**: Ensure all ruff checks pass with zero issues
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- ❌ **Maintain test coverage**: Keep 149 tests passing during cleanup
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### Phase 4: Advanced Edit Features
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- ❌ **Add new entries**: Create new host entries
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- ❌ **Delete entries**: Remove host entries
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			@ -91,19 +95,9 @@
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## Current Status
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### Development Stage
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**Stage**: Phase 3 Complete with Save Confirmation Enhancement - Ready for Phase 4
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**Progress**: 78% (Complete edit mode foundation with professional save confirmation)
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**Next Milestone**: Advanced edit features (add/delete entries, bulk operations)
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### Phase 2 Final Achievements
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1. ✅ **Advanced configuration system**: Complete settings management with persistence
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2. ✅ **Professional modal dialogs**: Configuration modal with proper keyboard bindings
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3. ✅ **Intelligent filtering**: Hide/show default system entries based on user preference
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4. ✅ **Complete sorting system**: Sort by IP address and hostname with direction toggle
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5. ✅ **Rich visual interface**: Color-coded entries with professional DataTable styling
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6. ✅ **Interactive headers**: Click column headers to sort data
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7. ✅ **Enhanced user experience**: Visual sort indicators and comprehensive status information
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8. ✅ **Robust configuration**: JSON-based settings with graceful error handling
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**Stage**: Phase 3 Complete with Code Quality Maintenance Required
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**Progress**: 82% (Complete edit mode foundation with save confirmation, code cleanup needed)
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**Next Milestone**: Code quality cleanup, then Phase 4 advanced edit features
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### Phase 3 Final Achievements ✅ COMPLETE
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1. ✅ **Permission management**: Complete PermissionManager class with sudo request and validation
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			@ -114,22 +108,17 @@
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6. ✅ **Manager module**: Complete HostsManager class for all edit operations
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7. ✅ **Safe file operations**: Atomic file writing with rollback capability
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8. ✅ **Enhanced error messages**: Professional read-only mode error messages with clear instructions
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9. ✅ **Comprehensive testing**: 38 new tests for manager module (148 total tests)
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9. ✅ **Comprehensive testing**: Full test coverage for manager module (149 total tests)
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10. ✅ **Save confirmation modal**: Professional save/discard/cancel dialog when exiting edit entry mode
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11. ✅ **Change detection system**: Intelligent tracking of original vs. current entry values
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12. ✅ **No auto-save behavior**: User-controlled saving with explicit confirmation
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### Recent Major Accomplishments
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- ✅ **Complete Phase 3 implementation**: Full edit mode foundation with permission management
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- ✅ **Manager module**: PermissionManager and HostsManager classes with comprehensive functionality
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- ✅ **Edit mode integration**: Seamless integration with main TUI application
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- ✅ **Permission system**: Robust sudo request, validation, and release functionality
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- ✅ **File backup system**: Automatic backup creation with timestamp naming
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- ✅ **Entry manipulation**: Toggle active/inactive and reorder entries safely
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- ✅ **Save confirmation enhancement**: Professional modal dialog system for editing workflow
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- ✅ **Comprehensive testing**: 161 total tests with 100% pass rate including save confirmation
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- ✅ **Error handling**: Graceful handling of permission errors and file operations
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- ✅ **Keyboard shortcuts**: Complete set of edit mode bindings (e, space, Ctrl+Up/Down, Ctrl+S)
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### Current Project State
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- **Application functionality**: Fully functional with advanced edit capabilities
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- **Test coverage**: 149 tests with 100% pass rate covering all functionality
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- **Code quality issue**: 20 linting issues (unused imports/variables) need cleanup
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- **Architecture**: Robust layered design ready for Phase 4 advanced features
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- **User experience**: Professional TUI with modal dialogs and comprehensive keyboard shortcuts
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## Technical Implementation Details
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### Test Coverage Excellence
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- **Models**: 27 comprehensive tests covering all data model edge cases
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- **Parser**: 15 tests covering file operations, permissions, and error conditions
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- **Coverage**: 100% of core functionality with edge case validation
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- **Manager**: Comprehensive tests for permission management and edit operations
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- **UI Components**: Full coverage of modal dialogs and TUI interactions
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- **Total**: 149 tests with 100% pass rate and comprehensive edge case coverage
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- **Quality**: All tests passing consistently with fast execution
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### Code Quality Standards
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- **Linting**: Perfect ruff compliance with zero issues
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- **Linting**: 20 minor issues (unused imports/variables) requiring cleanup
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- **Type hints**: Complete type coverage throughout entire codebase
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- **Documentation**: Comprehensive docstrings and inline comments
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- **Error handling**: Graceful exception handling with user feedback
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## Known Issues
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### Phase 3 Enhancement Opportunities
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### Immediate Code Quality Issues
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- **Linting warnings**: 20 unused import and variable warnings in core and test files
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- **Code standard compliance**: Must address before proceeding to Phase 4
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- **Auto-fixable**: All issues can be resolved with `uv run ruff check --fix`
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### Phase 4 Enhancement Opportunities
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- **Add new entries**: Create new host entries with validation (planned for Phase 4)
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- **Delete entries**: Remove host entries with confirmation (planned for Phase 4)
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- **Search functionality**: Find entries by hostname or IP address (planned for Phase 4)
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- **Help modal**: Proper help dialog instead of status message (planned for Phase 4)
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- **Large file performance**: Not yet tested with very large hosts files
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- Mock `/etc/hosts` file I/O and DNS lookups to avoid system dependencies.
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- Include integration tests for the Textual TUI (using `textual.testing` or snapshot testing).
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### Implemented Tests (97 tests total)
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### Implemented Tests (149 tests total)
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1. **Parsing Tests** (15 tests):
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   - Parse simple `/etc/hosts` with comments and disabled entries
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   - Configuration loading and saving
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   - Default entry detection and filtering
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4. **Modal Dialog Tests** (15 tests):
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   - Configuration modal lifecycle
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   - User interaction handling
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   - Keyboard binding validation
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   - State management during configuration changes
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5. **Main Application Tests** (18 tests):
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   - Application initialization and startup
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4. **TUI Application Tests** (28 tests):
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   - Main application initialization and startup
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   - File loading and error handling
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   - User interface state management
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   - Sorting and navigation functionality
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   - Modal dialog lifecycle and interactions
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   - Keyboard binding validation
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5. **Manager Module Tests** (38 tests):
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   - Permission management and sudo handling
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   - Edit mode operations and state transitions
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   - File backup and atomic operations
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   - Entry manipulation and validation
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6. **Save Confirmation Tests** (13 tests):
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   - Modal dialog lifecycle and user interactions
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   - Change detection and validation
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   - Save/discard/cancel functionality
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   - Integration with edit workflow
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7. **Configuration Modal Tests** (6 tests):
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   - Modal configuration interface
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   - Settings persistence and validation
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   - User interaction handling
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### Current Test Coverage Status
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- **Total Tests**: 149 comprehensive tests
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- **Pass Rate**: 100% (all tests passing)
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- **Coverage Areas**: Core models, file parsing, configuration, TUI components, edit operations, modal dialogs
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		||||
- **Code Quality**: 20 minor linting issues (unused imports/variables) requiring cleanup
 | 
			
		||||
 | 
			
		||||
### Future Test Areas (Planned)
 | 
			
		||||
- **Edit Mode Tests**: Permission management and file modification
 | 
			
		||||
- **Advanced Edit Tests**: Add/delete entries, bulk operations
 | 
			
		||||
- **DNS Resolution Tests**: Hostname resolution and IP comparison
 | 
			
		||||
- **Performance Tests**: Large file handling and optimization
 | 
			
		||||
- **Integration Tests**: End-to-end workflow testing
 | 
			
		||||
- **Search Functionality Tests**: Entry searching and filtering
 | 
			
		||||
| 
						 | 
				
			
			
 | 
			
		|||
| 
						 | 
				
			
			@ -34,8 +34,9 @@
 | 
			
		|||
#### System Layer (Implemented)
 | 
			
		||||
- ✅ **File I/O**: Atomic file operations with backup support
 | 
			
		||||
- ✅ **Permission checking**: Validation of file access permissions
 | 
			
		||||
- ✅ **Permission management**: Sudo request and handling for edit mode
 | 
			
		||||
- ✅ **Backup system**: Automatic backup creation before modifications
 | 
			
		||||
- 🔄 **DNS Resolution**: Planned for Phase 5 advanced features
 | 
			
		||||
- 🔄 **Permission Management**: Sudo handling planned for Phase 3 edit mode
 | 
			
		||||
 | 
			
		||||
## Key Technical Decisions
 | 
			
		||||
 | 
			
		||||
| 
						 | 
				
			
			@ -93,10 +94,13 @@ class Config:
 | 
			
		|||
- ✅ **Reactive state**: Using Textual's reactive attributes for complex UI updates
 | 
			
		||||
- ✅ **Configuration state**: Persistent settings with JSON storage and graceful error handling
 | 
			
		||||
- ✅ **Sorting state**: Reactive sort column and direction with visual indicators
 | 
			
		||||
- ✅ **Edit mode state**: Safe transitions between read-only and edit modes
 | 
			
		||||
- ✅ **Permission state**: Sudo request, validation, and release management
 | 
			
		||||
- ✅ **Validation pipeline**: All data validated in models, parser, and configuration
 | 
			
		||||
- ✅ **File integrity**: Atomic operations preserve file structure
 | 
			
		||||
- ✅ **Error handling**: Graceful degradation for all error conditions
 | 
			
		||||
- ✅ **Modal state**: Professional modal dialog lifecycle management
 | 
			
		||||
- ✅ **Change detection**: Intelligent tracking for save confirmation
 | 
			
		||||
- 🔄 **Undo/Redo capability**: Planned for Phase 4 with command pattern
 | 
			
		||||
- 🔄 **Dirty state tracking**: Will be implemented in Phase 3 edit mode
 | 
			
		||||
 | 
			
		||||
| 
						 | 
				
			
			
 | 
			
		|||
| 
						 | 
				
			
			@ -32,13 +32,13 @@ hosts/
 | 
			
		|||
### Current State
 | 
			
		||||
- ✅ **Complete uv project**: Python 3.13 with full dependency management
 | 
			
		||||
- ✅ **Production application**: Fully functional TUI with advanced features and professional interface
 | 
			
		||||
- ✅ **Perfect code quality**: All ruff checks passing with zero issues
 | 
			
		||||
- ✅ **Code quality maintenance required**: 20 linting issues (unused imports/variables) need cleanup
 | 
			
		||||
- ✅ **Proper project structure**: Well-organized src/hosts/ package with core and tui modules
 | 
			
		||||
- ✅ **Comprehensive testing**: 97 tests covering all functionality including new features
 | 
			
		||||
- ✅ **Comprehensive testing**: 149 tests covering all functionality including new features
 | 
			
		||||
- ✅ **Entry point configured**: `hosts` command launches application perfectly
 | 
			
		||||
- ✅ **Configuration system**: Complete settings management with JSON persistence
 | 
			
		||||
- ✅ **Modal interface**: Professional configuration dialogs with keyboard bindings
 | 
			
		||||
- ✅ **Advanced features**: Sorting, filtering, and rich visual interface
 | 
			
		||||
- ✅ **Advanced features**: Sorting, filtering, edit mode, and save confirmation
 | 
			
		||||
 | 
			
		||||
### Runtime Management
 | 
			
		||||
- ✅ **uv run hosts**: Command executes application instantly
 | 
			
		||||
| 
						 | 
				
			
			@ -94,11 +94,17 @@ hosts = "hosts.main:main"
 | 
			
		|||
 | 
			
		||||
### Development Workflow
 | 
			
		||||
1. ✅ **uv run hosts**: Execute the application - launches instantly
 | 
			
		||||
2. ✅ **uv run ruff check**: Lint code - all checks passing perfectly
 | 
			
		||||
2. 🔧 **uv run ruff check**: Lint code - 20 issues need fixing
 | 
			
		||||
3. ✅ **uv run ruff format**: Auto-format code - consistent style maintained
 | 
			
		||||
4. ✅ **uv run pytest**: Run test suite - 42 tests passing with 100% success rate
 | 
			
		||||
4. ✅ **uv run pytest**: Run test suite - 149 tests passing with 100% success rate
 | 
			
		||||
5. ✅ **uv add**: Add dependencies - seamless dependency management
 | 
			
		||||
 | 
			
		||||
### Code Quality Status
 | 
			
		||||
- **Current issues**: 20 linting warnings (unused imports and variables)
 | 
			
		||||
- **Auto-fixable**: All issues can be resolved with `uv run ruff check --fix`
 | 
			
		||||
- **Test coverage**: 149 comprehensive tests with 100% pass rate
 | 
			
		||||
- **Code formatting**: Perfect formatting compliance maintained
 | 
			
		||||
 | 
			
		||||
### Code Quality Achieved
 | 
			
		||||
- ✅ **ruff configuration**: Perfect compliance with zero issues across all modules
 | 
			
		||||
- ✅ **Type hints**: Complete type coverage throughout entire codebase including new components
 | 
			
		||||
| 
						 | 
				
			
			
 | 
			
		|||
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