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
-- **Perfect code quality**: All linting and formatting standards maintained
-- **Robust architecture**: Clean layered design ready for edit mode extension
+- **Comprehensive test coverage**: 149 tests with 100% pass rate covering all components
+- **Code quality maintenance needed**: 20 linting issues (unused imports/variables) require cleanup
+- **Robust architecture**: Clean layered design ready for Phase 4 advanced features
 
 ## Next Steps
 
-### Phase 3: Edit Mode Foundation (Current Priority)
-1. **Permission management system**:
-   - Implement sudo request and validation
-   - Edit mode toggle with proper security handling
-   - Permission validation and error handling
-   - Graceful fallback for permission denied scenarios
+### Immediate Priority: Code Quality Cleanup
+1. **Fix linting issues**: Address 20 unused import and variable warnings
+   - Remove unused imports in core/config.py, test files
+   - Clean up unused variables in exception handling
+   - Run `uv run ruff check --fix` to auto-fix issues
 
-2. **Basic editing operations**:
-   - Toggle entries active/inactive with visual feedback
-   - Entry editing interface for IP addresses, hostnames, and comments
-   - Real-time validation of IP addresses and hostnames
-   - Safe state management during editing
+2. **Code quality validation**:
+   - Ensure all ruff checks pass with zero issues
+   - Maintain perfect test coverage (149 tests passing)
+   - Verify application functionality after cleanup
 
-3. **File safety and backup**:
-   - 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)
+### Phase 4: Advanced Edit Features (Next Phase)
 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
-- 🔄 **Observer pattern**: Will implement for state change notifications in edit mode
+- ✅ **Command pattern**: Implemented for edit operations with save confirmation
+- 🔄 **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