import os
from google import genai

def get_genai_client():
    """
    Initialize and return a Google GenAI client using an API key from the environment.
    """
    api_key = os.getenv("GOOGLE_GENAI_API_KEY")
    if not api_key:
        raise ValueError("API key not found. Please set the 'GOOGLE_GENAI_API_KEY' environment variable.")
    
    try:
        client = genai.Client(api_key=api_key)
        return client
    except Exception as e:
        raise RuntimeError(f"Failed to initialize Google GenAI client: {e}")