# Changelog

All notable changes to Atomizer will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).

## [Unreleased]

### Phase 3.2 - Integration & NX Enhancements (In Progress)

#### Added
- **NX Expression Import System** (2025-11-17)
  - Robust .exp file-based expression updates via NX journal scripts
  - Supports ALL NX expression types including binary-stored ones
  - Automatic unit detection and formatting
  - Fixes issue with `hole_count` and other feature-linked expressions
  - Documentation: [NX_EXPRESSION_IMPORT_SYSTEM.md](docs/NX_EXPRESSION_IMPORT_SYSTEM.md)
  - New journal: `import_expressions.py` for .exp file import
  - Enhanced `nx_updater.py` with `update_expressions_via_import()` method

- **4D Design Space Validation** (2025-11-17)
  - Validated full 4-variable optimization (beam_half_core_thickness, beam_face_thickness, holes_diameter, hole_count)
  - All variables now updating correctly in optimization loop
  - Mesh adaptation verified across different hole_count values

### Phase 2 - LLM Integration (Completed 85%)
- Natural language interface for optimization configuration
- Feature registry with capability catalog
- Claude skill for Atomizer navigation
- LLM workflow analyzer and extractor orchestration
- Dynamic code generation for hooks and extractors

---

## [0.2.0] - 2025-01-16

### Phase 1 - Plugin System & Infrastructure ✅

#### Added
- **Plugin Architecture**
  - Hook manager with lifecycle execution at `pre_solve`, `post_solve`, and `post_extraction` points
  - Plugin auto-discovery from `optimization_engine/plugins/` directory
  - Priority-based hook execution
  - Context passing system for hooks (output_dir, trial_number, design_variables, results)

- **Logging Infrastructure**
  - Detailed per-trial logs in `optimization_results/trial_logs/`
    - Complete iteration trace with timestamps
    - Design variables, configuration, execution timeline
    - Extracted results and constraint evaluations
  - High-level optimization progress log (`optimization.log`)
    - Configuration summary header
    - Trial START and COMPLETE entries (one line per trial)
    - Compact format for easy progress monitoring

- **Logging Plugins**
  - `detailed_logger.py` - Creates detailed trial logs
  - `optimization_logger.py` - Creates high-level optimization.log
  - `log_solve_complete.py` - Appends solve completion to trial logs
  - `log_results.py` - Appends extracted results to trial logs
  - `optimization_logger_results.py` - Appends results to optimization.log

- **Project Organization**
  - Studies folder structure with standardized layout
  - Comprehensive studies documentation ([studies/README.md](studies/README.md))
  - Model files organized in `model/` subdirectory (`.prt`, `.sim`, `.fem`)
  - Intelligent path resolution system (`atomizer_paths.py`)
  - Marker-based project root detection

- **Test Suite**
  - `test_hooks_with_bracket.py` - Hook validation test (3 trials)
  - `run_5trial_test.py` - Quick integration test (5 trials)
  - `test_journal_optimization.py` - Full optimization test

#### Changed
- Renamed `examples/` folder to `studies/`
- Moved bracket example to `studies/bracket_stress_minimization/`
- Consolidated FEA files into `model/` subfolder
- Updated all test scripts to use `atomizer_paths` for imports
- Runner now passes `output_dir` to all hook contexts

#### Removed
- Obsolete test scripts from examples/ (14 files deleted)
- `optimization_logs/` and `optimization_results/` from root directory

#### Fixed
- Log files now correctly generated in study-specific `optimization_results/` folder
- Path resolution works regardless of script location
- Hooks properly registered with `register_hooks()` function

---

## [0.1.0] - 2025-01-10

### Initial Release

#### Core Features
- Optuna integration with TPE sampler
- NX journal integration for expression updates and simulation execution
- OP2 result extraction (stress, displacement)
- Study management with folder-based isolation
- Web dashboard for real-time monitoring
- Precision control (4-decimal rounding for mm/degrees/MPa)
- Crash recovery and optimization resumption

---

## Development Timeline

- **Phase 1** (✅ Completed 2025-01-16): Plugin system & hooks
- **Phase 2** (🟡 Starting): LLM interface with natural language configuration
- **Phase 3** (Planned): Dynamic code generation for custom objectives
- **Phase 4** (Planned): Intelligent analysis and surrogate quality assessment
- **Phase 5** (Planned): Automated HTML/PDF report generation
- **Phase 6** (Planned): NX MCP server with full API documentation
- **Phase 7** (Planned): Self-improving feature registry

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**Maintainer**: Antoine Polvé (antoine@atomaste.com)
**License**: Proprietary - Atomaste © 2025