from social.backends.oauth import BaseOAuth2


class ChangeTipOAuth2(BaseOAuth2):
    """ChangeTip OAuth authentication backend
       https://www.changetip.com/api
    """
    name = 'changetip'
    AUTHORIZATION_URL = 'https://www.changetip.com/o/authorize/'
    ACCESS_TOKEN_URL = 'https://www.changetip.com/o/token/'
    ACCESS_TOKEN_METHOD = 'POST'
    SCOPE_SEPARATOR = ' '

    def get_user_details(self, response):
        """Return user details from ChangeTip account"""
        return {
            'username': response['username'],
            'email': response.get('email', ''),
            'first_name': '',
            'last_name': '',
        }

    def user_data(self, access_token, *args, **kwargs):
        """Loads user data from service"""
        return self.get_json('https://api.changetip.com/v2/me/', params={
            'access_token': access_token
        })