import os
import requests
import json
from typing import Dict, List, Optional

class OpenRouterClient:
    def __init__(self, api_key: str = ""):
        self.base_url = "https://openrouter.ai/api/v1"
        self.api_key = api_key or os.getenv("OPENROUTER_API_KEY", "")
        self.headers = {
            "Authorization": f"Bearer {self.api_key}",
            "Content-Type": "application/json",
            "HTTP-Referer": "https://huggingface.co/spaces",
            "X-Title": "OpenRouter AI Hub"
        }
    
    def chat_completion(
        self,
        model: str,
        messages: List[Dict[str, str]],
        temperature: Optional[float] = 0.7,
        max_tokens: Optional[int] = 1024,
        **kwargs
    ) -> Dict:
        """
        Get chat completion from OpenRouter
        
        Parameters:
        - model: Model identifier (e.g., "openai/gpt-3.5-turbo")
        - messages: List of message dictionaries with role and content
        - temperature: Creativity parameter (0-2)
        - max_tokens: Maximum length of response
        """
        payload = {
            "model": model,
            "messages": messages,
            "temperature": temperature,
            "max_tokens": max_tokens,
            **kwargs
        }
        
        try:
            response = requests.post(
                f"{self.base_url}/chat/completions",
                headers=self.headers,
                data=json.dumps(payload)
            )
            
            response.raise_for_status()
            return response.json()
        except requests.exceptions.RequestException as e:
            raise Exception(f"OpenRouter API request failed: {str(e)}")
    
    def list_models(self) -> List[Dict]:
        """
        List all available models from OpenRouter
        """
        try:
            response = requests.get(
                f"{self.base_url}/models",
                headers=self.headers
            )
            
            response.raise_for_status()
            return response.json().get("data", [])
        except requests.exceptions.RequestException as e:
            raise Exception(f"OpenRouter API request failed: {str(e)}")

def get_openrouter_client():
    return OpenRouterClient()