# Reference Code

## Purpose

This directory contains reference implementations, code examples, and patterns that serve as templates for new development in the LLM AnyGate project. These are proven solutions that can be adapted for similar requirements.

## Contents

Store here:
- Working code examples
- Third-party integration samples
- Design pattern implementations
- API client examples
- Configuration examples
- Test pattern examples

## Naming Conventions

- `example-[feature].py` - Standalone examples
- `pattern-[name].py` - Design pattern implementations
- `integration-[service].py` - Third-party integrations
- `snippet-[functionality].py` - Reusable code snippets
- `template-[component].py` - Component templates

## Example Documents

### For LLM AnyGate project:
- `example-provider-impl.py` - Complete provider implementation
- `pattern-retry-logic.py` - Exponential backoff retry pattern
- `integration-litellm.py` - LiteLLM library integration
- `snippet-async-handler.py` - Async request handling
- `template-config-validator.py` - Configuration validation template
- `example-rate-limiter.py` - Rate limiting implementation

## File Structure Example

```python
# example-provider-impl.py
"""
Reference implementation of a custom LLM provider.

## HEADER
- **Purpose**: Template for creating new providers
- **Status**: verified
- **Date**: 2024-08-26
- **Dependencies**: httpx, pydantic
- **Target**: AI assistants implementing new providers

## Usage
Copy this file and modify for your specific provider.
Replace CustomProvider with your provider name.
"""

from typing import Any, Dict, Optional
from llm_anygate.providers import Provider
import httpx

class CustomProvider(Provider):
    """Reference provider implementation."""
    
    def __init__(self, api_key: Optional[str] = None, 
                 base_url: str = "https://api.example.com"):
        super().__init__(api_key)
        self.base_url = base_url
        self.client = httpx.AsyncClient()
    
    async def complete(self, prompt: str, **kwargs: Any) -> str:
        """Generate completion with proper error handling."""
        try:
            response = await self.client.post(
                f"{self.base_url}/complete",
                json={"prompt": prompt, **kwargs},
                headers={"Authorization": f"Bearer {self.api_key}"}
            )
            response.raise_for_status()
            return response.json()["completion"]
        except httpx.HTTPError as e:
            # Proper error handling pattern
            raise ProviderError(f"API request failed: {e}")
    
    def get_info(self) -> Dict[str, Any]:
        return {
            "provider": "Custom",
            "base_url": self.base_url,
            "authenticated": bool(self.api_key)
        }

# Test usage
if __name__ == "__main__":
    provider = CustomProvider(api_key="test")
    # Test implementation
```

## Organization

### By Category:
```
refcode/
├── providers/          # Provider implementations
├── validators/         # Input validation examples
├── handlers/          # Request/response handlers
├── integrations/      # Third-party service integrations
└── patterns/          # Common design patterns
```

## Best Practices

1. Include complete, runnable examples
2. Add comprehensive comments explaining key concepts
3. Show both correct usage and common pitfalls
4. Include test code or usage examples
5. Keep examples focused on one concept
6. Update when better patterns are discovered