## [Unreleased]

### Added

- **Terminal Buffer Management Refactoring:**
  - Split `manager.ex` into specialized modules for better separation of concerns:
    - `State` - Handles buffer initialization and state management
    - `Cursor` - Manages cursor position and movement
    - `Damage` - Tracks damaged regions in the buffer
    - `Memory` - Handles memory usage and limits
    - `Scrollback` - Manages scrollback buffer operations
    - `Buffer` - Handles buffer operations and synchronization
    - `Manager` - Main facade that coordinates all components
  - Improved code organization and maintainability
  - Enhanced test coverage for each specialized module
  - Better error handling and state management
  - Clearer interfaces between components
  - Comprehensive documentation for all modules
- **Dependency Resolution System Improvements:**
  - Enhanced version constraint handling with support for complex requirements (e.g., ">= 1.0.0 || >= 2.0.0")
  - Implemented Tarjan's algorithm for efficient cycle detection and component identification
  - Added detailed dependency chain reporting for better error diagnostics
  - Improved version parsing with comprehensive error handling
  - Optimized dependency graph operations for better performance
  - Added type specifications for better documentation and type safety
- **CSI Handlers Refactoring:**
  - Refactored `CSIHandlers` module to delegate command handling to specialized modules
  - Created specialized handlers for cursor, buffer, erase, device, and mode operations
  - Added comprehensive test coverage and improved error handling
  - Standardized parameter handling across all handlers
  - Added TODOs for future improvements in window manipulation
- **Test Infrastructure Improvements:**
  - Added unique state tracking for test plugins using `state_id` and timestamps
  - Enhanced plugin test fixtures with better state management
  - Added comprehensive metadata validation testing
  - Improved resource cleanup in plugin lifecycle
  - Event-based test synchronization replacing all `Process.sleep` calls
  - System interaction adapter pattern for testable system calls
  - High-contrast mode support and reduced motion preference
  - Improved test coverage for terminal memory management, including both unit and integration tests for memory usage estimation
- **Performance Testing Infrastructure:**
  - New `Raxol.Test.PerformanceHelper` module for benchmarking
  - Performance test suite for terminal manager
  - Performance requirements and metrics collection
  - Event processing benchmarks (< 1ms average, < 2ms 95th percentile)
  - Screen update benchmarks (< 2ms average, < 5ms 95th percentile)
  - Concurrent operation benchmarks (< 5ms average, < 10ms 95th percentile)
- **Terminal Refactoring (Complete):**
  - Created specialized managers for buffer, cursor, state, command, style, parser, and input operations
  - All new modules have comprehensive test coverage
  - Improved code organization and maintainability
  - Reduced complexity in `emulator.ex`
- **Plugin System Behaviors:**
  - Completed and documented all plugin system behavior modules
  - Each behavior module includes comprehensive documentation and clear callback specifications
  - Consistent patterns for error handling and state management
- **Color System Refactoring:**
  - Implemented centralized color system architecture
  - Created specialized modules for color management
  - Enhanced accessibility integration
  - Improved theme management
  - Added color palette management and utilities
- **API Improvements:**
  - Renamed `border/2` to `border_wrap/2` for better clarity and consistency
  - Updated macro versions to use `border_wrap` instead of `border`
  - Updated documentation to reflect the new function name
  - Updated table view to use the new `border_wrap` function
  - Maintained same functionality while improving API clarity
- **Plugin Lifecycle Testing:**
  - Added comprehensive test suite for plugin lifecycle events
  - Added configuration management tests
  - Added concurrent operations tests
  - Added plugin communication tests
  - Added error recovery tests
  - Enhanced test isolation and cleanup
  - Improved state management verification
  - Added resource cleanup validation
- **SelectList Advanced Feature Tests:**
  - Added comprehensive tests for SelectList advanced features:
    - Custom item rendering
    - Filtering (basic, by field, empty state, case-insensitive)
    - Keyboard navigation after filtering
  - These tests replace previously skipped/placeholder tests and improve coverage for advanced SelectList features.
- **Memory Manager Integration Tests:**
  - Added integration-style tests for `Raxol.Terminal.MemoryManager.estimate_memory_usage/1` using real `Raxol.Terminal.Integration.State`, `Buffer.Manager`, and `Buffer.Scroll` structs.
  - Tests cover default, custom, and partial state scenarios, ensuring robust memory usage estimation.
- **Test Tracking Improvement:**
  - Added a prioritized table of skipped tests blocked only by minor refactors, missing helpers, or minor API changes to `docs/testing/test_tracking.md` (May 2025). This table helps the team focus on unskipping and updating "low-hanging fruit" tests before addressing feature-blocked or obsolete tests, supporting the roadmap and test stabilization efforts.
- **Theme Refactor:**
  - Refactored all theme usage to use `Raxol.UI.Theming.Theme` exclusively. Removed legacy theme modules and references. Codebase is now fully canonical for theming. (2025-06-10)
- **Documentation Improvements:**
  - Completed comprehensive guides (Plugin Dev, Theming, VS Code Ext).
  - Reviewed and improved ExDoc (`@moduledoc`, `@doc`, `@spec`) for key public modules.
  - Successfully generated ExDoc documentation (`mix docs`).
  - Improved README example.
  - Component system documentation is now harmonized and cross-linked across README, ARCHITECTURE.md, API reference, and architecture guide.
  - Added component lifecycle documentation, composition patterns guide, testing patterns guide, style guide, and updated component README with API reference links.
  - Testing framework documentation: documented test helper modules, added event-based testing examples, performance testing guide, troubleshooting section, and best practices.
  - Pre-commit script improvements: file discovery now includes hidden directories and normalizes paths; key project READMEs are explicitly included; anchor checking temporarily disabled due to parsing complexities; file existence checks are active.
  - Continued refactoring large files (see docs/changes/LARGE_FILES_FOR_REFACTOR.md for tracking and guidelines).
  - Tracking of large or growing test helper files is now in place.
- Theming and style prop support for SelectList, TextInput, TextField, and Button components. All now support `style` and `theme` props, with proper merging and override precedence.
- Lifecycle hooks (`mount/1`, `unmount/1`) for SelectList, TextInput, TextField, and Button components.
- Expanded/added test suites for SelectList, TextInput, TextField, and Button, covering theming, style, lifecycle, and responsiveness.
- Dedicated test file for TextField: `test/raxol/ui/components/input/text_field_test.exs`. Button: test/examples/button_test.exs expanded for style, theme, and lifecycle coverage.
- SelectList, TextInput, TextField, and Button components now use merged `style` and `theme` props throughout their render logic.
- All four components now implement and test lifecycle hooks (`mount/1`, `unmount/1`).
- Test coverage for these components is now comprehensive and up to date.
- **Checkbox Component Refactor:**
  - Fully refactored and tested.
  - Now supports style and theme props (with correct merging and override precedence).
  - Implements robust lifecycle hooks (`mount/1`, `unmount/1`).
  - Supports accessibility and extra props (`tooltip`, `required`, `aria_label`).
  - Test coverage expanded for style/theme merging, lifecycle, accessibility, and responsiveness.
  - Harmonized with Button, SelectList, TextInput, and TextField components.
- **Progress Component Refactor:**
  - Fully refactored and tested.
  - Now supports harmonized style and theme prop merging (context.theme < theme prop < style prop).
  - Implements robust lifecycle hooks (`mount/1`, `unmount/1`).
  - Supports accessibility and extra props (`aria_label`, `tooltip`).
  - Test coverage expanded for style/theme merging, lifecycle, accessibility, and responsiveness.
  - Harmonized with Button, Checkbox, SelectList, TextInput, and TextField components.
- **MultiLineInput Harmonization and Documentation:**
  - MultiLineInput and other modern input components now use a harmonized API for props, theming, clipboard, and cursor management.
  - Architecture, clipboard, and cursor documentation updated to reflect these conventions and reference the main UI components guide. (2024-07-30)
- MultiLineInput: All styling is now theme-driven. The `style` field and `@default_style` are removed. Use the theme system for appearance customization. (BREAKING)

### Changed

- **Test Reliability:**
  - Replaced all `Process.sleep` calls with event-based synchronization
  - Enhanced plugin test fixtures with better state management
  - Improved error handling and reporting
  - Better resource cleanup in plugin lifecycle
  - Clear test boundaries for plugin operations
- **Documentation:**
  - Updated color system documentation
  - Enhanced theming guide
  - Improved accessibility color integration docs
  - Updated architecture documentation
  - Refined roadmap and next steps
  - Reorganized and harmonized all component system documentation (README, ARCHITECTURE.md, API reference, architecture guide) with improved cross-linking and unified lifecycle/terminology.
  - Consolidated large file and test helper file refactoring tracking into docs/changes/LARGE_FILES_FOR_REFACTOR.md
- Updated `test/raxol/terminal/emulator_plugin_test.exs` to use current APIs and mocks for plugin lifecycle, event, and command handler tests.
- **Test Suite:**
  - All dependency manager resolution tests now pass.
- **Test and Infrastructure Fixes:**
  - Fixed Manager.Behaviour/mock issue in file watcher tests to unblock test suite.
  - Fixed Mox compile errors due to duplicate LoaderMock/FileWatcherMock definitions; all plugin system tests now use global mocks (2025-06-10).
  - Re-ran test suite and updated failure/skipped/invalid counts.
  - Restored and fixed Raxol.Terminal.DriverTestHelper (helper import, pattern match, and assertion issues resolved; test suite now proceeds past helper errors).
  - Addressed remaining test failures (KeyError for :single_shift resolved; next focus: scroll region/handle_r/2 and screen resizing failures).
- **Component Enhancements:**
  - Implemented Table features: pagination buttons, filtering, sorting.
  - Implemented FocusRing styling based on state/effects.
  - Enhanced SelectList: stateful scroll offset, robust focus management, search/filtering.
  - Completed component system documentation.
  - Fixed SelectList component implementation.
  - All advanced SelectList features (custom rendering, filtering, navigation, empty state, case insensitivity) are now covered by real tests.
- **Terminal Command Handler Test Fixes:**
  - Updated all tests for `DeviceHandlers.handle_c/2` to use the correct `handle_c/3` signature, matching the real API and improving maintainability.
  - No unnecessary wrapper functions were added; the API remains minimal and explicit.
  - All related test failures are now resolved.

### Deprecated

- Old event system
- Legacy rendering approach
- Previous styling methods
- `Raxol.Terminal.CommandHistory` (Use `Raxol.Terminal.Commands.History` instead)

### Removed

- **PluginSystem:** Removed redundant `Raxol.Core.Runtime.Plugins.Commands` GenServer
- Removed redundant clipboard modules
- `Raxol.UI.Components.ScreenModes` module and associated tests/references
- Removed `:meck` direct usage from test files
- Deleted `

### TODO / Next Steps

- Investigate and resolve remaining test failures in `Raxol.Core.Runtime.Plugins.PerformanceTest` (MatchError and ArithmeticError in performance and dependency graph tests).
- Review and improve performance test assertions to match actual return values and metrics.
- Address any remaining skipped or flaky tests, especially those related to plugin system and dependency manager edge cases.
- Continue refactoring and harmonizing test helpers and fixtures for maintainability.