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# API.box Implementation Analysis

Based on [API.box Documentation](https://docs.api.box/), here's what we need to verify:

## Current Implementation vs API Requirements

### ✅ What We're Doing Correctly:

1. **API Endpoint**: `https://api.api.box/api/v1/generate` ✓
2. **Authentication**: Using Bearer token ✓
3. **Callback URL**: Setting `callBackUrl` ✓
4. **Models Supported**: V3_5, V4, V4_5, V5 ✓

### ⚠️ Potential Issues to Verify:

#### 1. **Duration Parameter**
- **Current**: Sending `duration` in seconds (e.g., 360 = 6 minutes)
- **API Limit**: 
  - V3_5/V4: Up to 4 minutes (240 seconds)
  - V4_5/V4_5PLUS: Up to 8 minutes (480 seconds)
  - V5: Check documentation
- **Issue**: If we send 360 seconds (6 minutes) to V3_5, it might cap at 4 minutes
- **Fix Needed**: Validate duration against model version

#### 2. **Model Version**
- **Current**: Defaulting to `V5` or `V3_5`
- **API Models**: V3_5, V4, V4_5, V4_5PLUS, V5
- **Issue**: Need to verify V5 exists and supports our duration requirements
- **Fix Needed**: Check if V5 supports 5-7 minute tracks

#### 3. **CustomMode Parameter**
- **Current**: Sending `customMode: 'true'` or `'false'` (string)
- **API Expected**: Need to verify if it expects boolean or string
- **Issue**: Might need to be boolean `true`/`false` instead of string

#### 4. **Style Parameter**
- **Current**: Only sending if genre is provided (good!)
- **API Expected**: Should be optional, let API determine from prompt
- **Status**: ✅ Fixed - we now only send if explicitly provided

#### 5. **Title Parameter**
- **Current**: Only sending if title is provided (good!)
- **API Expected**: Should be optional
- **Status**: ✅ Fixed - we now only send if explicitly provided

## Callback Format Analysis

### Expected Callback Structure (from API.box):
The callback should contain:
- `task_id` or `id` - Task identifier
- `status` - Processing status (processing/complete/failed)
- `audio_url` - URL to generated audio
- `data` - Additional metadata

### Our Callback Handler:
- ✅ Handles `task_id` format
- ✅ Handles `id` format  
- ✅ Handles error codes (531, 400)
- ✅ Handles `callbackType` format
- ✅ Extracts metadata from multiple locations

## Key Questions to Answer:

1. **Does V5 model exist and support 5-7 minute tracks?**
   - If not, we should use V4_5 or V4_5PLUS for longer tracks

2. **What is the exact parameter format?**
   - Are parameters case-sensitive?
   - Should `customMode` be boolean or string?
   - What's the exact duration format?

3. **What does the callback actually return?**
   - Exact structure of successful callback
   - Where is metadata located?
   - How are variations structured?

## Recommended Next Steps:

1. **Check API Documentation** for exact parameter specifications
2. **Test with different models** (V4_5, V4_5PLUS) for 5-7 minute tracks
3. **Verify callback format** matches what we're expecting
4. **Add model-based duration validation**:
   ```php
   if ($finalModel === 'V3_5' || $finalModel === 'V4') {
       $maxDuration = 240; // 4 minutes
   } elseif ($finalModel === 'V4_5' || $finalModel === 'V4_5PLUS') {
       $maxDuration = 480; // 8 minutes
   }
   if ($finalDuration > $maxDuration) {
       $finalDuration = $maxDuration;
   }
   ```

5. **Log actual API responses** to understand what's being returned

## Files to Review:

- `create_music.php` - API request construction
- `callback.php` - Callback handling
- `create_music_debug.log` - What we're sending
- `callback_log.txt` - What API is returning