# Live AI Call Context Preservation Fixes

## 🔧 Changes Made

### 1. **Removed Unused Routes**
- **Deleted:** `/addition_routes/ai_call_routes.py` (not used by Flutter app)
- **Kept:** `/audio_generation/live_call_routes.py` (the only one Flutter uses)

### 2. **Fixed Context Truncation Issues**
Fixed multiple places where context was being truncated before sending to AI:

#### **Conversation History**
- **Before:** Limited to 20 messages, truncated to last 10 on init
- **After:** Increased to 500 messages, keeps ALL on initialization
```python
# Fixed in CallSession class
conversation_history: deque = field(default_factory=lambda: deque(maxlen=500))

# Fixed in session initialization
if data.get('conversation_history'):
    for msg in data['conversation_history']:  # Keep ALL messages
        session.conversation_history.append(msg)
```

#### **Study Material Context**
- **Before:** Truncated to 500 characters
- **After:** Full context preserved
```python
# Fixed in create_simple_prompt()
Study material: {context if context else "General conversation"}  # Full context, no truncation
```

#### **Message History**
- **Before:** User messages truncated to 150 chars, AI to 200 chars
- **After:** Full messages preserved
```python
# Fixed in build_conversation_context()
if role == 'user':
    history_text += f"Student: {content}\n"  # Full content
elif role == 'assistant':
    history_text += f"You: {content}\n"  # Full content
```

---

## 📱 How Flutter App Sends Content

The Flutter app sends educational content through the `/api/audio_generation/live-call/start` endpoint with this structure:

### **Request Payload Structure**
```json
{
  "topic_id": "quiz_or_topic_id",
  "course_id": "course_identifier",
  "study_context": "FULL NOTES/QUIZ CONTENT HERE",
  "system_prompt": "Custom instructions for AI behavior",
  "conversation_history": [
    {"role": "user", "content": "previous message"},
    {"role": "assistant", "content": "AI response"}
  ],
  "language": "en-US",
  "language_name": "English"
}
```

### **Content Types Sent by Flutter**

#### **1. Quiz Content (from quiz_taking_screen.dart)**
```dart
String _generateQuizTakingContext() {
    // Sends complete quiz information including:
    // - Quiz title, type, difficulty
    // - Current question number and progress
    // - Full question text
    // - All available options (without correct answers)
    // - Negative marking info
    // - Time remaining
}
```

#### **2. Notes Content (from topic_notes_screen.dart)**
```dart
String _generateTopicContext() {
    // Sends:
    // - Topic title
    // - Course name
    // - FULL NOTES CONTENT with markers:
    //   "=== FULL NOTES CONTENT FOR AI ANALYSIS ==="
    //   [Complete notes content]
    //   "=== END OF NOTES CONTENT ==="
}
```

#### **3. Live AI Call Service (live_ai_call_service.dart)**
```dart
// Sends context via these fields:
'study_context': initialContext,  // Full notes/quiz content
'conversation_history': conversationHistory,  // All previous messages
'system_prompt': systemPrompt,  // Custom AI instructions
'topic_id': topicId,
'course_id': courseId,
```

---

## ✅ What's Fixed

### **Before:**
- Context truncated to 500 characters
- Conversation history limited to 6-10 messages
- Message content truncated (150-200 chars)
- Quiz questions and notes content partially lost
- AI couldn't see full educational material

### **After:**
- **Full context preserved** - no truncation
- **All conversation history maintained** (up to 500 messages)
- **Complete message content** preserved
- **Full quiz questions and options** available to AI
- **Complete notes content** sent to AI for analysis
- **Better educational responses** with full context

---

## 🎯 Key Benefits

1. **Quiz Support:** AI can see all question details and guide students properly
2. **Notes Analysis:** AI has access to complete study material for better explanations
3. **Context Continuity:** Full conversation history helps maintain learning flow
4. **No Information Loss:** All educational content reaches the AI intact
5. **Better Tutoring:** AI can reference specific parts of notes and previous discussions

---

## 📊 Content Flow

```
Flutter App
    ↓
Sends full context via POST /api/audio_generation/live-call/start
    ↓
Server creates CallSession with full study_context
    ↓
User speaks → POST /api/audio_generation/live-call/speech
    ↓
generate_ai_response() gets:
    - Full study_context (notes/quiz)
    - Complete conversation_history
    - User's question
    ↓
AI processes with complete context
    ↓
Response generated and sent back as audio
```

---

## 🔒 Important Notes

1. **Memory Management:** With increased limits (500 messages), monitor memory usage in production
2. **Token Limits:** Full context may hit AI model token limits for very long notes
3. **Performance:** Larger context = slightly slower processing, but better quality responses
4. **Caching:** Response cache still works to avoid regenerating identical responses

---

## 🚀 Testing Recommendations

1. Test with long notes (5000+ words) to ensure no truncation
2. Test quiz sessions with 20+ questions to verify context preservation
3. Monitor memory usage with extended conversations
4. Verify audio generation still works with longer AI responses
5. Test conversation continuity across multiple exchanges

---

## 📝 Summary

The live AI call system now preserves **100% of educational context** sent by the Flutter app, ensuring the AI has complete information about:
- Quiz questions and options
- Full notes content
- Complete conversation history
- Custom system prompts

This enables much better educational tutoring and learning support without any loss of critical information.
