gemini_client.py

import os
import httpx

API_KEY = os.environ.get("GEMINI_API_KEY", "your-api-key-here")
MODEL_NAME = os.environ.get("MODEL_NAME", "gemini-2.0-flash")
BASE_URL = "https://generativelanguage.googleapis.com/v1beta"

def chat(messages: list[dict], **kwargs) -> str:
    headers = {
        "Content-Type": "application/json"
    }
    
    # Convert messages to Gemini format
    contents = []
    for msg in messages:
        role = "user" if msg["role"] == "user" else "model"
        contents.append({
            "role": role,
            "parts": [{"text": msg["content"]}]
        })
    
    payload = {
        "contents": contents,
        "generationConfig": {
            "temperature": kwargs.get("temperature", 1.0),
            "maxOutputTokens": kwargs.get("max_tokens", 2048),
            "topP": kwargs.get("top_p", 0.95),
            "topK": kwargs.get("top_k", 40)
        }
    }
    
    url = f"{BASE_URL}/models/{MODEL_NAME}:generateContent?key={API_KEY}"
    
    response = httpx.post(
        url,
        json=payload,
        headers=headers,
        timeout=60.0
    )
    
    if response.status_code != 200:
        raise Exception(f"Error: {response.status_code} - {response.text}")
    
    result = response.json()
    return result["candidates"][0]["content"]["parts"][0]["text"]

if __name__ == "__main__":
    response = chat([
        {"role": "user", "content": "Hello! What model are you?"}
    ])
    print(response)