import json
import os

def format_conversation(message, history):
    """Format conversation for the model."""
    conversation = []
    for msg in history:
        conversation.append(f"{msg['role']}: {msg['content']}")
    conversation.append(f"user: {message}")
    return "\n".join(conversation)

def save_chat_history(history):
    """Save chat history to a file."""
    with open("chat_history.json", "w") as f:
        json.dump(history, f)

def load_chat_history():
    """Load chat history from a file."""
    if os.path.exists("chat_history.json"):
        with open("chat_history.json", "r") as f:
            return json.load(f)
    return []