import os
from utils.currency_converter import CurrencyConverter
from typing import List
from langchain.tools import tool
from dotenv import load_dotenv

class CurrencyConverterTool:
    def __init__(self):
        load_dotenv()
        self.api_key = os.environ.get("EXCHANGE_RATE_API_KEY")
        self.currency_service = CurrencyConverter(self.api_key)
        self.currency_converter_tool_list = self._setup_tools()

    def _setup_tools(self) -> List:
        """Setup all tools for the currency converter tool"""
        @tool
        def convert_currency(amount:float, from_currency:str, to_currency:str):
            """Convert amount from one currency to another"""
            try:
                return self.currency_service.convert(amount, from_currency, to_currency)
            except Exception as exc:
                return (
                    "Live currency conversion is currently unavailable "
                    f"({exc}). Continue with the user's provided currency and, "
                    "if needed, clearly label any conversion as an approximate estimate."
                )
        
        return [convert_currency]