# RAG Pipeline with OpenRouter GLM Integration

## 🎯 **Project Overview**

Successfully integrated OpenRouter's GLM-4.5-air model as the primary AI with RAG tool calling capabilities, replacing Google Gemini dependency.

## ✅ **Completed Features**

### **1. OpenRouter GLM Integration**
- **Model**: `z-ai/glm-4.5-air:free` via OpenRouter API
- **Intelligent Tool Calling**: GLM automatically decides when to use RAG vs general conversation
- **Fallback Handling**: Graceful degradation when datasets are loading

### **2. New Chat Endpoint (`/chat`)**
- **Multi-turn Conversations**: Full conversation history support
- **Smart Tool Selection**: AI chooses RAG tool when relevant to user query
- **Response Format**: Returns both AI response and tool execution details
- **Error Handling**: Comprehensive error catching and user-friendly messages

### **3. RAG Tool Function**
- **Function**: `rag_qa(question, dataset)` 
- **Dynamic Dataset Selection**: Supports multiple datasets (developer-portfolio, etc.)
- **Background Loading**: Non-blocking dataset initialization
- **Error Recovery**: Handles missing datasets and pipeline errors

### **4. Backward Compatibility**
- **Legacy `/answer` endpoint**: Still fully functional
- **Existing API contracts**: No breaking changes
- **Dataset Support**: All existing datasets work unchanged

### **5. Infrastructure Improvements**
- **Removed Google Gemini**: No more Google API key dependency
- **Comprehensive .gitignore**: Python cache, IDE files, OS files
- **Clean Architecture**: Separated concerns between AI and RAG components

## 🧪 **Testing Suite**

### **Test Coverage** (13 test cases, all passing)
- **Chat Endpoint Tests**: Basic functionality, tool calling, error handling
- **RAG Function Tests**: Loaded pipelines, missing datasets, exceptions
- **Pipeline Tests**: Initialization, preset creation, question answering
- **Tools Tests**: Configuration structure and parameters
- **Legacy Tests**: Backward compatibility verification

### **Test Quality**
- **Mocking Strategy**: Isolated unit tests without external dependencies
- **Edge Cases**: Error scenarios and boundary conditions
- **Integration Ready**: FastAPI TestClient for endpoint testing

## 🚀 **Usage Examples**

### **General Chat**
```bash
curl -X POST "http://localhost:8000/chat" \
  -H "Content-Type: application/json" \
  -d '{"messages": [{"role": "user", "content": "Hello! How are you?"}]}'
```

### **RAG-Powered Questions**
```bash
curl -X POST "http://localhost:8000/chat" \
  -H "Content-Type: application/json" \
  -d '{"messages": [{"role": "user", "content": "What is your experience as a Tech Lead?"}], "dataset": "developer-portfolio"}'
```

### **Legacy Endpoint**
```bash
curl -X POST "http://localhost:8000/answer" \
  -H "Content-Type: application/json" \
  -d '{"text": "What is your role?", "dataset": "developer-portfolio"}'
```

## 📊 **Architecture Benefits**

### **Intelligent AI Assistant**
- **Context Awareness**: Knows when to use RAG vs general knowledge
- **Tool Extensibility**: Easy to add new tools beyond RAG
- **Conversation Memory**: Maintains context across multiple turns

### **Performance Optimizations**
- **Background Loading**: Datasets load asynchronously after server start
- **Memory Efficient**: Only loads required datasets
- **Fast Response**: Direct AI responses without RAG when not needed

### **Developer Experience**
- **Clean Dependencies**: No Google API key required
- **Comprehensive Tests**: Full test coverage for confidence
- **Clear Documentation**: Examples and usage patterns

## 🔧 **Technical Implementation**

### **Key Components**
1. **OpenRouter Client**: GLM-4.5-air model integration
2. **Tool Calling**: Dynamic function registration and execution
3. **RAG Pipeline**: Simplified to focus on retrieval and prompting
4. **FastAPI Application**: Modern async endpoints with proper error handling

### **Configuration**
- **Environment Variables**: Minimal dependencies (only optional for legacy features)
- **Dataset Configs**: Flexible configuration system for multiple datasets
- **Model Settings**: Easy to update models and parameters

## 🎉 **Summary**

The application now provides a **smart conversational AI** that can:
- ✅ Handle general chat conversations
- ✅ Automatically use RAG when relevant
- ✅ Support multiple datasets and tools
- ✅ Maintain backward compatibility
- ✅ Scale efficiently with background loading
- ✅ Provide comprehensive test coverage

**Ready for production deployment** with full confidence in functionality and reliability.