from smolagents import tool
import datetime

@tool
def estimate_preparation_time(start_time: str = None) -> str:
    """
    Estimates total preparation time for a party and returns when everything will be ready.
    Args:
        start_time (str, optional): Start time in format HH:MM. Defaults to current time.
    """
    tasks = {
        "Prepare the drinks": 30,
        "Decorate the mansion": 60,
        "Set up the menu": 45,
        "Prepare the music and playlist": 45,
    }
    total_minutes = sum(tasks.values())
    if start_time:
        now = datetime.datetime.strptime(start_time, "%H:%M")
    else:
        now = datetime.datetime.now()
    ready_time = now + datetime.timedelta(minutes=total_minutes)
    return f"Total prep time: {total_minutes} minutes. The party will be ready at {ready_time.strftime('%H:%M')}."