import urlparse

class OAuthConfig(object):
  def __init__(self, config, key_name):
    self.key_name = key_name
    self.config = config.get(key_name) or {}

  def service_name(self):
    raise NotImplementedError

  def token_endpoint(self):
    raise NotImplementedError

  def user_endpoint(self):
    raise NotImplementedError

  def login_endpoint(self):
    raise NotImplementedError

  def client_id(self):
    return self.config.get('CLIENT_ID')

  def client_secret(self):
    return self.config.get('CLIENT_SECRET')

  def basic_scope(self):
    raise NotImplementedError

  def _get_url(self, endpoint, *args):
    for arg in args:
      endpoint = urlparse.urljoin(endpoint, arg)

    return endpoint


class GithubOAuthConfig(OAuthConfig):
  def __init__(self, config, key_name):
    super(GithubOAuthConfig, self).__init__(config, key_name)

  def service_name(self):
    return 'GitHub'

  def _endpoint(self):
    endpoint = self.config.get('GITHUB_ENDPOINT', 'https://github.com')
    if not endpoint.endswith('/'):
      endpoint = endpoint + '/'
    return endpoint

  def basic_scope(self):
    return 'user:email'

  def authorize_endpoint(self):
    return self._get_url(self._endpoint(), '/login/oauth/authorize')  + '?'

  def token_endpoint(self):
    return self._get_url(self._endpoint(), '/login/oauth/access_token')

  def _api_endpoint(self):
    return self.config.get('API_ENDPOINT', self._get_url(self._endpoint(), '/api/v3/'))

  def api_endpoint(self):
    return self._api_endpoint()[0:-1]

  def user_endpoint(self):
    api_endpoint = self._api_endpoint()
    return self._get_url(api_endpoint, 'user')

  def email_endpoint(self):
    api_endpoint = self._api_endpoint()
    return self._get_url(api_endpoint, 'user/emails')

  def get_public_config(self):
    return  {
      'CLIENT_ID': self.client_id(),
      'AUTHORIZE_ENDPOINT': self.authorize_endpoint(),
      'GITHUB_ENDPOINT': self._endpoint()
    }



class GoogleOAuthConfig(OAuthConfig):
  def __init__(self, config, key_name):
    super(GoogleOAuthConfig, self).__init__(config, key_name)

  def service_name(self):
    return 'Google'

  def basic_scope(self):
    return 'openid email'

  def authorize_endpoint(self):
    return 'https://accounts.google.com/o/oauth2/auth?response_type=code&'

  def token_endpoint(self):
    return 'https://accounts.google.com/o/oauth2/token'

  def user_endpoint(self):
    return 'https://www.googleapis.com/oauth2/v1/userinfo'

  def get_public_config(self):
    return  {
      'CLIENT_ID': self.client_id(),
      'AUTHORIZE_ENDPOINT': self.authorize_endpoint()
    }