# Image Studio Editing - Service Integration Summary

**Date**: Current Session  
**Status**: ✅ **COMPLETE** - Service Integration with 3 WaveSpeed Models

---

## ✅ Completed Integration

### **Service Layer Refactoring**

**File**: `backend/services/image_studio/edit_service.py`

**Changes**:
1. ✅ Added import for `generate_image_edit` from unified entry point
2. ✅ Refactored `_handle_general_edit()` method to:
   - Detect WaveSpeed models (`qwen-edit-plus`, `nano-banana-pro-edit-ultra`, `seedream-v4.5-edit`)
   - Route to unified entry point for WaveSpeed models
   - Fall back to HuggingFace for backward compatibility
3. ✅ Maintained all existing functionality:
   - Stability AI operations (remove_background, inpaint, outpaint, etc.) - unchanged
   - HuggingFace general_edit - still works as before
   - Pre-flight validation - unchanged
   - Response format - unchanged

### **Routing Logic**

```python
# Detection logic:
wavespeed_models = {
    "qwen-edit-plus",
    "nano-banana-pro-edit-ultra", 
    "seedream-v4.5-edit",
}

is_wavespeed = (
    request.provider == "wavespeed" or
    (request.model and request.model in wavespeed_models)
)
```

**If WaveSpeed**:
- Uses `generate_image_edit()` unified entry point
- Gets validation, tracking, and error handling automatically
- Supports all 3 integrated models

**If Not WaveSpeed**:
- Falls back to HuggingFace (legacy behavior)
- Maintains backward compatibility

---

## 🔄 API Endpoint

**File**: `backend/routers/image_studio.py`

**Status**: ✅ No changes needed
- `EditImageRequest` already includes `model` parameter (line 88)
- Endpoint `/api/image-studio/edit/process` already accepts `model`
- Service layer handles routing automatically

**Usage Example**:
```json
{
  "image_base64": "...",
  "operation": "general_edit",
  "prompt": "Change the background to a beach scene",
  "model": "qwen-edit-plus",  // WaveSpeed model
  "provider": "wavespeed"     // Optional, auto-detected from model
}
```

---

## ✅ Backward Compatibility

### **Stability AI Operations** (Unchanged)
- `remove_background` → Still uses Stability AI
- `inpaint` → Still uses Stability AI
- `outpaint` → Still uses Stability AI
- `search_replace` → Still uses Stability AI
- `search_recolor` → Still uses Stability AI
- `relight` → Still uses Stability AI

### **HuggingFace General Edit** (Fallback)
- If `model` is not a WaveSpeed model → Uses HuggingFace
- If `provider` is not "wavespeed" → Uses HuggingFace
- All existing HuggingFace functionality preserved

### **WaveSpeed Models** (New)
- If `model` is one of: `qwen-edit-plus`, `nano-banana-pro-edit-ultra`, `seedream-v4.5-edit`
- Or if `provider` is "wavespeed"
- → Routes to unified entry point

---

## 📊 Integration Flow

```
API Request
    ↓
EditStudioService.process_edit()
    ↓
Operation Type Check
    ↓
┌─────────────────────────────────────┐
│  Stability AI Operations            │
│  (remove_background, inpaint, etc.)│
│  → StabilityAIService              │
└─────────────────────────────────────┘
    ↓
┌─────────────────────────────────────┐
│  General Edit                       │
│  → _handle_general_edit()           │
│     ↓                               │
│  Model Detection                    │
│     ↓                               │
│  ┌─────────────────────────────┐   │
│  │ WaveSpeed Model?            │   │
│  │ → generate_image_edit()     │   │
│  │   (unified entry point)     │   │
│  └─────────────────────────────┘   │
│     ↓                               │
│  ┌─────────────────────────────┐   │
│  │ HuggingFace (fallback)      │   │
│  │ → huggingface_edit_image()  │   │
│  └─────────────────────────────┘   │
└─────────────────────────────────────┘
```

---

## 🎯 Testing Checklist

- [ ] Test WaveSpeed model selection (`qwen-edit-plus`)
- [ ] Test WaveSpeed model selection (`nano-banana-pro-edit-ultra`)
- [ ] Test WaveSpeed model selection (`seedream-v4.5-edit`)
- [ ] Test HuggingFace fallback (no model or non-WaveSpeed model)
- [ ] Test Stability AI operations (unchanged)
- [ ] Test pre-flight validation (unchanged)
- [ ] Test error handling
- [ ] Test backward compatibility with existing clients

---

## 📝 Notes

1. **No Breaking Changes**: All existing API calls continue to work
2. **Opt-in Enhancement**: WaveSpeed models are opt-in via `model` parameter
3. **Automatic Routing**: Service automatically detects and routes to appropriate provider
4. **Unified Benefits**: WaveSpeed models get validation, tracking, and error handling from unified entry point

---

*Service integration complete - Ready for frontend model selector*
