"""
Chatwork OAuth2 backend
"""

import base64

from .oauth import BaseOAuth2


class ChatworkOAuth2(BaseOAuth2):
    """Chatwork OAuth authentication backend"""

    name = "chatwork"
    API_URL = "https://api.chatwork.com/v2"
    AUTHORIZATION_URL = "https://www.chatwork.com/packages/oauth2/login.php"
    ACCESS_TOKEN_URL = "https://oauth.chatwork.com/token"
    REDIRECT_STATE = True
    DEFAULT_SCOPE = ["users.profile.me:read"]
    ID_KEY = "account_id"
    EXTRA_DATA = [("expires_in", "expires"), ("refresh_token", "refresh_token")]

    def api_url(self, path):
        api_url = self.setting("API_URL") or self.API_URL
        return "{}{}".format(api_url.rstrip("/"), path)

    def auth_headers(self):
        return {
            "Authorization": b"Basic "
            + base64.b64encode("{}:{}".format(*self.get_key_and_secret()).encode())
        }

    def auth_complete_params(self, state=None):
        return {
            "grant_type": "authorization_code",
            "code": self.data.get("code", ""),
            "redirect_uri": self.get_redirect_uri(state),
        }

    def get_user_details(self, response):
        """Return user details from Chatwork account"""
        fullname, first_name, last_name = self.get_user_names(response.get("name"))
        username = (
            response.get("chatwork_id")
            or response.get("login_mail")
            or response.get("account_id")
        )
        email = response.get("mail") or response.get("login_mail") or ""
        return {
            "username": username,
            "email": email,
            "fullname": fullname,
            "first_name": first_name,
            "last_name": last_name,
        }

    def user_data(self, access_token, *args, **kwargs):
        """Loads user data from service"""
        headers = {"Authorization": "Bearer " + access_token}
        return self.get_json(self.api_url("/me"), headers=headers)

    def refresh_token_params(self, token, *args, **kwargs):
        return {"refresh_token": token, "grant_type": "refresh_token"}