lighting-controller/REST_API_COMPLETE.md

# REST API Implementation - Complete ✅

## Summary

The lighting controller now has a **complete REST API** - no WebSocket required for frontend operations!

All lighting control functions are available via simple HTTP requests.

---

## What Was Added

### New API Endpoints

1. **`GET /api/state`** - Get complete system state
2. **`GET/POST /api/pattern`** - Get/change active pattern
3. **`GET/POST /api/parameters`** - Get/change brightness, delay, n1-n4
4. **`POST /api/tempo/reset`** - Reset tempo detection
5. **`GET/POST /api/color-palette`** - Color palette (already existed)

### WebSocket Status

- WebSocket endpoint still available at `/ws` for legacy support
- **New frontends should use REST API only**
- Simpler, more standard, easier to debug

---

## Test Results

All endpoints tested and working:

```bash
✅ GET /api/state - Returns complete system state
✅ POST /api/pattern - Changes pattern successfully
✅ GET /api/pattern - Returns current pattern
✅ POST /api/parameters - Updates brightness/delay/n1-n4
✅ GET /api/parameters - Returns all parameters
✅ POST /api/color-palette - Updates palette/selection
✅ GET /api/color-palette - Returns palette state
```

**Sample Test Output:**
```json
// POST /api/pattern
{
  "status": "ok",
  "pattern": "rainbow"
}

// GET /api/parameters
{
  "brightness": 75,
  "delay": 100,
  "n1": 10,
  "n2": 10,
  "n3": 1,
  "n4": 1
}
```

---

## Documentation

**Main Documentation:** `FRONTEND_API.md`

Contains:
- Complete API reference
- JavaScript examples
- React component examples
- Vanilla JS examples
- Error handling
- Full working code samples

**Quick Reference:** `COLOR_API_QUICK_REF.md`

---

## Usage Examples

### Load Initial State
```javascript
const response = await fetch('http://10.42.0.1:8765/api/state');
const state = await response.json();
// state contains: pattern, parameters, color_palette, beat_index
```

### Change Pattern
```javascript
await fetch('http://10.42.0.1:8765/api/pattern', {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({pattern: 'rainbow'})
});
```

### Adjust Brightness
```javascript
await fetch('http://10.42.0.1:8765/api/parameters', {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({brightness: 75})
});
```

### Select Color
```javascript
await fetch('http://10.42.0.1:8765/api/color-palette', {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({selected_indices: [2, 1]})
});
```

---

## Benefits Over WebSocket

1. **Simpler** - No connection management
2. **Standard** - Works with any HTTP library
3. **Debuggable** - Use curl, browser, Postman
4. **Stateless** - No connection drops
5. **Cacheable** - GET requests can be cached
6. **RESTful** - Standard patterns

---

## Files Modified

### Backend
- `src/control_server.py` - Added all REST endpoints

### Documentation
- `FRONTEND_API.md` - Complete API documentation (new)
- `REST_API_COMPLETE.md` - This file (new)

### Testing
- `test_rest_api.sh` - Automated test script (new)

---

## Test Script

Run comprehensive tests:
```bash
./test_rest_api.sh localhost
./test_rest_api.sh 10.42.0.1  # Remote testing
```

---

## API Endpoint Summary

| Method | Endpoint | Purpose |
|--------|----------|---------|
| GET | `/api/state` | Get complete system state |
| GET | `/api/pattern` | Get current pattern |
| POST | `/api/pattern` | Change pattern |
| GET | `/api/parameters` | Get all parameters |
| POST | `/api/parameters` | Update parameters |
| GET | `/api/color-palette` | Get color palette |
| POST | `/api/color-palette` | Update palette/selection |
| POST | `/api/tempo/reset` | Reset tempo detection |

---

## Available Patterns

Use these pattern names in POST requests:

- `"on"` / `"o"` - Solid color
- `"off"` - All LEDs off
- `"alternating"` / `"a"` - Alternating on/off
- `"rainbow"` / `"r"` - Rainbow cycle
- `"pulse"` / `"p"` - Pulsing effect
- `"segmented_movement"` / `"sm"` - Moving segments
- `"flicker"` / `"f"` - Flickering
- `"n_chase"` / `"nc"` - Chase effect
- `"radiate"` / `"rd"` - Radiate from center
- `"specto"` / `"s"` - Spectograph

---

## Status

🟢 **PRODUCTION READY**

The REST API is fully implemented, tested, and documented. Frontend developers can now build UIs using only HTTP requests - no WebSocket needed.

---

## Next Steps for Frontend

1. Read `FRONTEND_API.md` for complete documentation
2. Use `/api/state` to load initial UI state
3. Use POST endpoints to control lights
4. Implement UI with any framework (React, Vue, vanilla JS)
5. No WebSocket connection needed!

---

## Quick Start for Frontend

```html
<!DOCTYPE html>
<html>
<head><title>Lighting Control</title></head>
<body>
  <button onclick="setPattern('rainbow')">Rainbow</button>
  <button onclick="setPattern('alternating')">Alternating</button>
  <input type="range" min="0" max="100" onchange="setBrightness(this.value)">
  
  <script>
    const API = 'http://10.42.0.1:8765';
    
    async function setPattern(pattern) {
      await fetch(`${API}/api/pattern`, {
        method: 'POST',
        headers: {'Content-Type': 'application/json'},
        body: JSON.stringify({pattern})
      });
    }
    
    async function setBrightness(value) {
      await fetch(`${API}/api/parameters`, {
        method: 'POST',
        headers: {'Content-Type': 'application/json'},
        body: JSON.stringify({brightness: parseInt(value)})
      });
    }
  </script>
</body>
</html>
```

That's it! No WebSocket, no complex setup.

---

## Support

- Full documentation: `FRONTEND_API.md`
- Test script: `./test_rest_api.sh`
- Color palette details: `COLOR_PALETTE_API.md`