# Cat Haven - Implementation Status

## Build Notes

### Phase 1: MVP Setup ✅
- [x] Project scaffolding with module structure
- [x] LOVR 2023 (v1.4) compatibility
- [x] Basic rendering pipeline
- [x] Game state management

### Phase 2: Core Systems ✅
- [x] **Core Module** (`src/core.lua`)
  - Configuration system
  - Personality definitions (5 types)
  - Furniture definitions (5 types)
  - Save/load system with JSON
  - Game loop and state updates

- [x] **JSON Module** (`src/json.lua`)
  - Custom encoder/decoder
  - Handles all Lua types
  - Non-string key support
  - Error handling for malformed JSON

- [x] **Voxel Module** (`src/voxel/init.lua`)
  - Procedural texture generation
  - Cube mesh rendering
  - AABB collision detection
  - Raycasting for interaction

- [x] **Cat Module** (`src/cat/init.lua`)
  - Cat class with state machine
  - AI behavior system
  - Personality compatibility logic
  - Serialization for save/load

- [x] **House Module** (`src/house/init.lua`)
  - Grid-based placement system
  - Collision detection
  - Furniture management
  - Upgrade system

- [x] **UI Module** (`src/ui/init.lua`)
  - HUD with happiness meter
  - Inventory panel
  - Cat log display
  - Placement preview

- [x] **Audio Module** (`src/audio/init.lua`)
  - Procedural purr sound
  - Procedural meow sound
  - Ambient room noise
  - Click sound effects

### Phase 3: Polish ✅
- [x] Error handling throughout
- [x] Nil checks on all module access
- [x] Edge case handling (empty lists, zero distance)
- [x] Automatic cat departure logic
- [x] Camera-agnostic raycasting
- [x] Responsive UI scaling

### Phase 4: Neverending Loop ✅
- [x] Infinite cat spawning
- [x] Continuous happiness calculation
- [x] Auto-departure for unhappy cats
- [x] Persistent save system

## Known Limitations

1. **Audio**: Procedural sounds are basic waveforms, not realistic animal sounds
2. **Rendering**: Simple box models, no complex geometry
3. **VR**: Designed for VR but tested in 2D mode only
4. **Performance**: O(n²) cat interaction complexity (acceptable for < 8 cats)

## Future Enhancements

- [ ] Multiple rooms
- [ ] Cat breeding system
- [ ] Furniture crafting
- [ ] Achievements system
- [ ] Sound mixing controls
- [ ] Cat coloring customization

## Technical Decisions

1. **Module Loading**: Lazy loading to break circular dependencies
2. **JSON Format**: Custom implementation for LOVR compatibility
3. **Audio**: Procedural generation to avoid external assets
4. **Textures**: Runtime generation to avoid external assets
5. **Collision**: AABB-based for simplicity and performance

## Testing Notes

To test in LOVR:
1. Run `lovr ./` from project root
2. Press RThumb + S to save
3. Press RThumb + L to load
4. Press ESC to pause
5. Click inventory items to select furniture
6. Watch cats interact with furniture

## Files Summary

| File | Lines | Purpose |
|------|-------|---------|
| main.lua | 45 | LOVR callbacks |
| src/core.lua | 453 | Game state, config, save/load |
| src/json.lua | 250 | JSON encoder/decoder |
| src/voxel/init.lua | 333 | Rendering, textures, raycasting |
| src/cat/init.lua | 274 | Cat AI, behavior, state machine |
| src/house/init.lua | 215 | Grid, placement, collision |
| src/ui/init.lua | 305 | HUD, inventory, cat log |
| src/audio/init.lua | 200 | Procedural audio generation |

**Total: 2,075 lines of Lua code**