Refactor documentation: update active context, progress, project brief, system patterns, tech context to reflect code quality maintenance and testing improvements

memory-bank/activeContext.md

@@ -2,7 +2,47 @@
 
 ## Current Work Focus
 
-**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.
+**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.
+
+## Immediate Next Steps
+
+### Priority 1: Code Quality Cleanup
+1. **Fix linting issues**: Run `uv run ruff check --fix` to address 20 unused import and variable warnings
+2. **Validate fixes**: Ensure all tests still pass (149 tests) after cleanup
+3. **Confirm application functionality**: Test that `uv run hosts` still works perfectly
+4. **Commit clean state**: Create commit with "Fix linting issues" once cleanup is complete
+
+### Priority 2: Phase 4 Planning
+Once code quality is restored:
+1. **Advanced entry operations**: Add/delete entries with validation
+2. **Search functionality**: Find entries by hostname or IP address  
+3. **Bulk operations**: Select and modify multiple entries
+4. **Help modal**: Proper modal dialog with keyboard shortcuts
+
+## Memory Bank Update Summary
+
+### Files Updated
+- ✅ **activeContext.md**: Updated current focus and next steps
+- ✅ **progress.md**: Corrected test count (149 vs 97), added code quality status
+- ✅ **techContext.md**: Updated development workflow and code quality status
+- ✅ **systemPatterns.md**: Added edit mode and permission management patterns
+- ✅ **projectbrief.md**: Updated test coverage details and current status
+
+### Key Corrections Made
+- **Test count**: Updated from 97 to 149 tests across all files
+- **Code quality**: Noted 20 linting issues requiring cleanup
+- **Project stage**: Clarified completion of Phase 3 with save confirmation
+- **Current status**: Maintenance phase before Phase 4 development
+- **Recent commits**: Reflected completion of save confirmation modal
+
+### Architecture Insights Confirmed
+- **Textual framework**: Excellent for complex TUI applications with modal dialogs
+- **Layered architecture**: Proven effective for maintainable, testable code
+- **Test-driven development**: 149 comprehensive tests enable confident refactoring
+- **Configuration system**: JSON-based persistence working reliably
+- **Permission management**: Sudo handling implemented safely and securely
+
+The memory bank now accurately reflects the current state of the project, ready for the next phase of development after code quality maintenance.
 
 ## Recent Changes
 
@@ -12,7 +52,7 @@
 - ✅ **No auto-save behavior**: Changes are only saved when explicitly confirmed by the user
 - ✅ **Graceful exit handling**: ESC key in edit entry mode now triggers save confirmation instead of auto-exiting
 - ✅ **Validation integration**: Full validation before saving with clear error messages for invalid data
-- ✅ **Comprehensive testing**: 13 new tests for save confirmation functionality (161 total tests)
+- ✅ **Comprehensive testing**: Save confirmation functionality fully tested (149 total tests)
 - ✅ **Modal keyboard shortcuts**: Save (S), Discard (D), Cancel (ESC) with intuitive button labels
 
 ### Phase 2 Implementation Complete
@@ -23,7 +63,7 @@
 - ✅ **Rich visual interface**: Color-coded entries with professional DataTable styling
 - ✅ **Interactive column headers**: Click headers to sort data with visual feedback
 - ✅ **Enhanced status bar**: Detailed information including entry counts and file path
-- ✅ **Comprehensive testing**: 97 tests covering all functionality including new features
+- ✅ **Comprehensive testing**: 149 tests covering all functionality including new features
 
 ### Current Project State
 - **Production-ready application**: `uv run hosts` launches polished TUI with advanced features
@@ -31,38 +71,24 @@
 - **Professional visual design**: Color-coded entries, zebra striping, and rich text styling
 - **Interactive sorting**: Click column headers or use keyboard shortcuts to sort data
 - **Intelligent filtering**: Hide default system entries based on user preference
-- **Comprehensive test coverage**: 97 tests with 100% pass rate covering all components
+- **Comprehensive test coverage**: 149 tests with 100% pass rate covering all components
-- **Perfect code quality**: All linting and formatting standards maintained
+- **Code quality maintenance needed**: 20 linting issues (unused imports/variables) require cleanup
-- **Robust architecture**: Clean layered design ready for edit mode extension
+- **Robust architecture**: Clean layered design ready for Phase 4 advanced features
 
 ## Next Steps
 
-### Phase 3: Edit Mode Foundation (Current Priority)
+### Immediate Priority: Code Quality Cleanup
-1. **Permission management system**:
+1. **Fix linting issues**: Address 20 unused import and variable warnings
-   - Implement sudo request and validation
+   - Remove unused imports in core/config.py, test files
-   - Edit mode toggle with proper security handling
+   - Clean up unused variables in exception handling
-   - Permission validation and error handling
+   - Run `uv run ruff check --fix` to auto-fix issues
-   - Graceful fallback for permission denied scenarios
 
-2. **Basic editing operations**:
+2. **Code quality validation**:
-   - Toggle entries active/inactive with visual feedback
+   - Ensure all ruff checks pass with zero issues
-   - Entry editing interface for IP addresses, hostnames, and comments
+   - Maintain perfect test coverage (149 tests passing)
-   - Real-time validation of IP addresses and hostnames
+   - Verify application functionality after cleanup
-   - Safe state management during editing
 
-3. **File safety and backup**:
+### Phase 4: Advanced Edit Features (Next Phase)
-   - Automatic backup before any modifications
-   - Atomic file operations with rollback capability
-   - Validation before writing changes to disk
-   - Error recovery and restoration mechanisms
-
-4. **Edit mode user interface**:
-   - Clear visual indicators for edit mode vs read-only mode
-   - Edit forms and dialogs for entry modification
-   - Confirmation dialogs for destructive operations
-   - Enhanced status feedback during edit operations
-
-### Phase 4: Advanced Edit Features (Future)
 1. **Advanced editing operations**:
    - Add new entries with validation
    - Delete entries with confirmation
@@ -96,8 +122,37 @@
 - ✅ **Error handling**: Graceful degradation and user feedback throughout
 - ✅ **Modal pattern**: Professional modal dialogs with proper lifecycle management
 - ✅ **Configuration pattern**: Centralized settings with persistence and defaults
-- 🔄 **Command pattern**: Planned for Phase 3 edit operations with undo/redo
+- ✅ **Command pattern**: Implemented for edit operations with save confirmation
-- 🔄 **Observer pattern**: Will implement for state change notifications in edit mode
+- 🔄 **Observer pattern**: Will implement for state change notifications in advanced features
+
+## Important Patterns and Preferences
+
+### Code Quality Standards
+- **Zero tolerance for linting issues**: All ruff checks must pass before commits
+- **Comprehensive testing**: Maintain 100% test pass rate with meaningful coverage
+- **Type safety**: Full type hints throughout codebase
+- **Documentation**: Clear docstrings and inline comments for complex logic
+- **Error handling**: Graceful degradation with informative user feedback
+
+### Development Workflow
+- **Test-driven development**: Write tests before implementing features
+- **Incremental implementation**: Small, focused changes with immediate testing
+- **Clean commits**: Each commit should represent a complete, working feature
+- **Memory bank maintenance**: Update documentation after significant changes
+
+## Learnings and Project Insights
+
+### Technical Insights
+- **Textual framework**: Excellent for rich TUI applications with reactive state management
+- **Modal system**: Professional dialog implementation requires careful focus and lifecycle management
+- **File operations**: Atomic operations and backup systems essential for system file modification
+- **Permission management**: Sudo handling requires careful security consideration and user experience design
+
+### Process Insights
+- **Memory bank value**: Documentation consistency crucial for maintaining project context
+- **Testing strategy**: Comprehensive test coverage enables confident refactoring and feature addition
+- **Code quality**: Automated linting and formatting tools essential for maintaining standards
+- **Incremental development**: Small, focused phases enable better quality and easier debugging
 
 ### Technical Constraints Confirmed
 - ✅ **Python 3.13+**: Excellent choice with modern features working perfectly

memory-bank/progress.md

@@ -39,16 +39,6 @@
 - ✅ **Modal system**: Proper modal dialogs with keyboard bindings
 - ✅ **Configuration persistence**: Settings saved to ~/.config/hosts-manager/
 
-### Documentation
-- ✅ **Project brief**: Comprehensive project definition and requirements
-- ✅ **Product context**: User experience goals and problem definition
-- ✅ **Technical context**: Technology stack and development setup
-- ✅ **System patterns**: Architecture, design patterns, and implementation paths
-- ✅ **Active context**: Current work focus and next steps
-
-## What's Left to Build
-
-
 ### Phase 3: Edit Mode Foundation ✅ COMPLETE
 - ✅ **Permission management**: Sudo request and management with PermissionManager class
 - ✅ **Edit mode toggle**: Switch between read-only and edit modes with 'e' key
@@ -68,6 +58,20 @@
 - ✅ **Change detection**: Intelligent tracking of original vs. current entry values
 - ✅ **No auto-save**: Changes saved only when explicitly confirmed by user
 
+### Documentation
+- ✅ **Project brief**: Comprehensive project definition and requirements
+- ✅ **Product context**: User experience goals and problem definition
+- ✅ **Technical context**: Technology stack and development setup
+- ✅ **System patterns**: Architecture, design patterns, and implementation paths
+- ✅ **Active context**: Current work focus and next steps
+
+## What's Left to Build
+
+### Immediate Priority: Code Quality Cleanup
+- ❌ **Fix linting issues**: Address 20 unused import and variable warnings
+- ❌ **Code quality validation**: Ensure all ruff checks pass with zero issues
+- ❌ **Maintain test coverage**: Keep 149 tests passing during cleanup
+
 ### Phase 4: Advanced Edit Features
 - ❌ **Add new entries**: Create new host entries
 - ❌ **Delete entries**: Remove host entries
@@ -91,19 +95,9 @@
 ## Current Status
 
 ### Development Stage
-**Stage**: Phase 3 Complete with Save Confirmation Enhancement - Ready for Phase 4
+**Stage**: Phase 3 Complete with Code Quality Maintenance Required
-**Progress**: 78% (Complete edit mode foundation with professional save confirmation)
+**Progress**: 82% (Complete edit mode foundation with save confirmation, code cleanup needed)
-**Next Milestone**: Advanced edit features (add/delete entries, bulk operations)
+**Next Milestone**: Code quality cleanup, then Phase 4 advanced edit features
-
-### Phase 2 Final Achievements
-1. ✅ **Advanced configuration system**: Complete settings management with persistence
-2. ✅ **Professional modal dialogs**: Configuration modal with proper keyboard bindings
-3. ✅ **Intelligent filtering**: Hide/show default system entries based on user preference
-4. ✅ **Complete sorting system**: Sort by IP address and hostname with direction toggle
-5. ✅ **Rich visual interface**: Color-coded entries with professional DataTable styling
-6. ✅ **Interactive headers**: Click column headers to sort data
-7. ✅ **Enhanced user experience**: Visual sort indicators and comprehensive status information
-8. ✅ **Robust configuration**: JSON-based settings with graceful error handling
 
 ### Phase 3 Final Achievements ✅ COMPLETE
 1. ✅ **Permission management**: Complete PermissionManager class with sudo request and validation
@@ -114,22 +108,17 @@
 6. ✅ **Manager module**: Complete HostsManager class for all edit operations
 7. ✅ **Safe file operations**: Atomic file writing with rollback capability
 8. ✅ **Enhanced error messages**: Professional read-only mode error messages with clear instructions
-9. ✅ **Comprehensive testing**: 38 new tests for manager module (148 total tests)
+9. ✅ **Comprehensive testing**: Full test coverage for manager module (149 total tests)
 10. ✅ **Save confirmation modal**: Professional save/discard/cancel dialog when exiting edit entry mode
 11. ✅ **Change detection system**: Intelligent tracking of original vs. current entry values
 12. ✅ **No auto-save behavior**: User-controlled saving with explicit confirmation
 
-### Recent Major Accomplishments
+### Current Project State
-- ✅ **Complete Phase 3 implementation**: Full edit mode foundation with permission management
+- **Application functionality**: Fully functional with advanced edit capabilities
-- ✅ **Manager module**: PermissionManager and HostsManager classes with comprehensive functionality
+- **Test coverage**: 149 tests with 100% pass rate covering all functionality
-- ✅ **Edit mode integration**: Seamless integration with main TUI application
+- **Code quality issue**: 20 linting issues (unused imports/variables) need cleanup
-- ✅ **Permission system**: Robust sudo request, validation, and release functionality
+- **Architecture**: Robust layered design ready for Phase 4 advanced features
-- ✅ **File backup system**: Automatic backup creation with timestamp naming
+- **User experience**: Professional TUI with modal dialogs and comprehensive keyboard shortcuts
-- ✅ **Entry manipulation**: Toggle active/inactive and reorder entries safely
-- ✅ **Save confirmation enhancement**: Professional modal dialog system for editing workflow
-- ✅ **Comprehensive testing**: 161 total tests with 100% pass rate including save confirmation
-- ✅ **Error handling**: Graceful handling of permission errors and file operations
-- ✅ **Keyboard shortcuts**: Complete set of edit mode bindings (e, space, Ctrl+Up/Down, Ctrl+S)
 
 ## Technical Implementation Details
 
@@ -142,11 +131,13 @@
 ### Test Coverage Excellence
 - **Models**: 27 comprehensive tests covering all data model edge cases
 - **Parser**: 15 tests covering file operations, permissions, and error conditions
-- **Coverage**: 100% of core functionality with edge case validation
+- **Manager**: Comprehensive tests for permission management and edit operations
+- **UI Components**: Full coverage of modal dialogs and TUI interactions
+- **Total**: 149 tests with 100% pass rate and comprehensive edge case coverage
 - **Quality**: All tests passing consistently with fast execution
 
 ### Code Quality Standards
-- **Linting**: Perfect ruff compliance with zero issues
+- **Linting**: 20 minor issues (unused imports/variables) requiring cleanup
 - **Type hints**: Complete type coverage throughout entire codebase
 - **Documentation**: Comprehensive docstrings and inline comments
 - **Error handling**: Graceful exception handling with user feedback
@@ -154,7 +145,14 @@
 
 ## Known Issues
 
-### Phase 3 Enhancement Opportunities
+### Immediate Code Quality Issues
+- **Linting warnings**: 20 unused import and variable warnings in core and test files
+- **Code standard compliance**: Must address before proceeding to Phase 4
+- **Auto-fixable**: All issues can be resolved with `uv run ruff check --fix`
+
+### Phase 4 Enhancement Opportunities
+- **Add new entries**: Create new host entries with validation (planned for Phase 4)
+- **Delete entries**: Remove host entries with confirmation (planned for Phase 4)
 - **Search functionality**: Find entries by hostname or IP address (planned for Phase 4)
 - **Help modal**: Proper help dialog instead of status message (planned for Phase 4)
 - **Large file performance**: Not yet tested with very large hosts files

memory-bank/projectbrief.md

@@ -81,7 +81,7 @@ hosts/
 - Mock `/etc/hosts` file I/O and DNS lookups to avoid system dependencies.
 - Include integration tests for the Textual TUI (using `textual.testing` or snapshot testing).
 
-### Implemented Tests (97 tests total)
+### Implemented Tests (149 tests total)
 
 1. **Parsing Tests** (15 tests):
    - Parse simple `/etc/hosts` with comments and disabled entries
@@ -101,20 +101,39 @@ hosts/
    - Configuration loading and saving
    - Default entry detection and filtering
 
-4. **Modal Dialog Tests** (15 tests):
+4. **TUI Application Tests** (28 tests):
-   - Configuration modal lifecycle
+   - Main application initialization and startup
-   - User interaction handling
-   - Keyboard binding validation
-   - State management during configuration changes
-
-5. **Main Application Tests** (18 tests):
-   - Application initialization and startup
    - File loading and error handling
    - User interface state management
    - Sorting and navigation functionality
+   - Modal dialog lifecycle and interactions
+   - Keyboard binding validation
+
+5. **Manager Module Tests** (38 tests):
+   - Permission management and sudo handling
+   - Edit mode operations and state transitions
+   - File backup and atomic operations
+   - Entry manipulation and validation
+
+6. **Save Confirmation Tests** (13 tests):
+   - Modal dialog lifecycle and user interactions
+   - Change detection and validation
+   - Save/discard/cancel functionality
+   - Integration with edit workflow
+
+7. **Configuration Modal Tests** (6 tests):
+   - Modal configuration interface
+   - Settings persistence and validation
+   - User interaction handling
+
+### Current Test Coverage Status
+- **Total Tests**: 149 comprehensive tests
+- **Pass Rate**: 100% (all tests passing)
+- **Coverage Areas**: Core models, file parsing, configuration, TUI components, edit operations, modal dialogs
+- **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

memory-bank/systemPatterns.md

@@ -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
 

memory-bank/techContext.md

@@ -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