import requests

from bot.msteams.token import Token

class Auth:
    def __init__(self, client_id: str, client_secret: str, tenant_id: str) -> None:
        self.client_id = client_id
        self.client_secret = client_secret
        self.tenant_id = tenant_id  
        self.__token = Token(self.__get_token_data())

    def __str__(self) -> str:
        if self.__token.is_expired:
            self.__token = Token(self.__get_token_data())
        return self.__token.token

    def __get_token_data(self) -> dict:
        url = f"https://login.microsoftonline.com/{self.tenant_id}/oauth2/v2.0/token"
        headers = {
            "Content-Type": "application/x-www-form-urlencoded"
        }
        data = {
            "grant_type": "client_credentials",
            "client_id": self.client_id,
            "client_secret": self.client_secret,
            "scope": "https://api.botframework.com/.default"
        }
        response = requests.post(url, headers=headers, data=data)
        return response.json()