import os
import requests

@mcp.tool()
def convert_timezone(date_time: str, from_timezone: str, to_timezone: str) -> str:

    headers = {"Content-Type": "application/json"}

    api_key = os.environ.get("TIMEZONE_API_KEY")
    if api_key:
        headers["Authorization"] = f"Bearer {api_key}"

    payload = {"dateTime": date_time, "fromTimezone": from_timezone, "toTimezone": to_timezone}
    try:
        r = requests.post("https://api.opentimezone.com/convert", json=payload, headers=headers, timeout=10)
        r.raise_for_status()
        data = r.json()
        converted_time = data.get("dateTime", "N/A")
        return f"Time in {to_timezone}: {converted_time}"
    except requests.exceptions.RequestException as e:
        return f"Error converting timezone: {e}"