# Config Validation Refactoring

## Session Summary

Fixed TOML syntax errors in test configurations and implemented comprehensive config validation refactoring.

## Changes Made

### Phase 1: TOML Syntax Fixes
- Fixed missing commas in orbit TOML blocks across 12 test config files
- Commas added after semi_major_axis and eccentricity values

### Phase 2: Config Validator Module Creation
- Created `src/config_validator.h` - New module interface
- Created `src/config_validator.cpp` - 6 validation functions:
  - `validate_parent_index_ordering()` - Parent index ordering checks
  - `validate_orbital_elements()` - Orbital elements validity
  - `validate_initial_positions()` - Moved from simulation
  - `validate_mass_ratios()` - Parent/child mass ratio validation (MIN_MASS_RATIO=1000)
  - `validate_soi_overlap()` - Detect overlapping SOIs (error if true)
  - `validate_nested_orbits()` - Moon orbit boundary checks
  - `run_all_config_validations()` - Master validation wrapper

### Phase 3: Module Integration
- Updated `config_loader.cpp` to use `run_all_config_validations()`
- Removed inline validation logic from config_loader
- Removed `validate_initial_positions()` from simulation module
- Updated Makefile to include config_validator.o

### Phase 4: Test Updates
- Deleted obsolete Test 1: "Earth should not become child of spacecraft"
- Deleted obsolete Test 3: "detect placeholder config values"
- Updated Test 4: "Mutual SOI" to expect load failure (config now invalid)

### Phase 5: Documentation Updates
- Updated `technical_reference.md` with all structural changes
- Corrected OrbitalElements, CelestialBody, and Spacecraft structs
- Added Config Validator module documentation
- Updated Initialization Sequence to include validation step
- Updated config examples to show orbit table format

## Commits

1. `4c8050b` - fix missing commas in orbit TOML blocks
2. `528a843` - add config validation refactoring plan
3. `3bd35bb` - create config_validator module and refactor validation logic
4. `1d8e9c6` - remove obsolete tests from test_invalid_parent_assignment
5. `84c1a4d` - update plan document to mark as complete
6. `a51cf1a` - update technical reference after config validation refactoring

## Results

- **Net line count**: +220 lines (606 insertions, 386 deletions)
- **Tests**: 30 test cases, 239,543 assertions - All passing
- **Modules created**: 1 (config_validator)
- **New files**: 2 (config_validator.h, config_validator.cpp)
- **Modified files**: 7 (Makefile, config_loader.cpp/h, simulation.cpp/h, test_invalid_parent_assignment.cpp, technical_reference.md)
- **Modified configs**: 13 test configs (TOML syntax fixes)

## Validation Rules Implemented

1. **Mass ratio validation**: For root children with radius > 50% of parent, require mass ratio ≥ 1000
2. **SOI overlap validation**: Bodies sharing same parent must not have overlapping SOIs (error)
3. **Nested orbit validation**: Moons (small radius, circular orbits) must orbit within 5x parent SOI
4. **Existing validations**: Parent index ordering, orbital elements, initial positions

## Remaining Issues

None. All tasks completed successfully.

## Next Steps

No specific next steps identified. Config validation refactoring is complete and all tests passing.