"""

"""

from keycloak.exceptions import raise_error_from_response, KeycloakGetError
from .urls_patterns import URL_AUTH, URL_TOKEN, URL_USERINFO, URL_WELL_KNOWN, URL_LOGOUT, \
    URL_CERTS, URL_ENTITLEMENT, URL_INTROSPECT
from .connection import ConnectionManager


class Keycloak:

    def __init__(self, server_url, client_id, realm_name, client_secret_key=None):
        self.__client_id = client_id
        self.__client_secret_key = client_secret_key
        self.__realm_name = realm_name

        self.__connection = ConnectionManager(base_url=server_url,
                                              headers={},
                                              timeout=60)

    def well_know(self):
        """ The most important endpoint to understand is the well-known configuration
            endpoint. It lists endpoints and other configuration options relevant to
            the OpenID Connect implementation in Keycloak.

            :return It lists endpoints and other configuration options relevant.
        """

        params_path = {"realm-name": self.__realm_name}
        data_raw = self.__connection.raw_get(URL_WELL_KNOWN.format(**params_path))

        return raise_error_from_response(data_raw, KeycloakGetError)

    def auth_url(self, redirect_uri):
        """

        http://openid.net/specs/openid-connect-core-1_0.html#AuthorizationEndpoint

        :return:
        """
        return NotImplemented

    def token(self, username, password, grant_type=["password",]):
        """
        The token endpoint is used to obtain tokens. Tokens can either be obtained by
        exchanging an authorization code or by supplying credentials directly depending on
        what flow is used. The token endpoint is also used to obtain new access tokens
        when they expire.

        http://openid.net/specs/openid-connect-core-1_0.html#TokenEndpoint

        :param username:
        :param password:
        :param grant_type:
        :return:
        """
        params_path = {"realm-name": self.__realm_name}
        payload = {"username": username, "password": password,
                   "client_id": self.__client_id, "grant_type": grant_type}

        if self.__client_secret_key:
            payload.update({"client_secret": self.__client_secret_key})

        data_raw = self.__connection.raw_post(URL_TOKEN.format(**params_path),
                                              data=payload)
        return raise_error_from_response(data_raw, KeycloakGetError)

    def userinfo(self, token):
        """
        The userinfo endpoint returns standard claims about the authenticated user,
        and is protected by a bearer token.

        http://openid.net/specs/openid-connect-core-1_0.html#UserInfo

        :param token:
        :return:
        """

        self.__connection.add_param_headers("Authorization", "Bearer " + token)
        params_path = {"realm-name": self.__realm_name}

        data_raw = self.__connection.raw_get(URL_USERINFO.format(**params_path))

        return raise_error_from_response(data_raw, KeycloakGetError)

    def logout(self, refresh_token):
        """
        The logout endpoint logs out the authenticated user.
        :param refresh_token:
        :return:
        """
        params_path = {"realm-name": self.__realm_name}
        payload = {"client_id": self.__client_id, "refresh_token": refresh_token}

        if self.__client_secret_key:
            payload.update({"client_secret": self.__client_secret_key})

        data_raw = self.__connection.raw_post(URL_LOGOUT.format(**params_path),
                                              data=payload)

        return raise_error_from_response(data_raw, KeycloakGetError, expected_code=204)

    def certs(self):
        """
        The certificate endpoint returns the public keys enabled by the realm, encoded as a
        JSON Web Key (JWK). Depending on the realm settings there can be one or more keys enabled
        for verifying tokens.

        https://tools.ietf.org/html/rfc7517

        :return:
        """
        params_path = {"realm-name": self.__realm_name}
        data_raw = self.__connection.raw_get(URL_CERTS.format(**params_path))
        return raise_error_from_response(data_raw, KeycloakGetError)

    def entitlement(self, token, resource_server_id):
        """
        Client applications can use a specific endpoint to obtain a special security token
        called a requesting party token (RPT). This token consists of all the entitlements
        (or permissions) for a user as a result of the evaluation of the permissions and authorization
        policies associated with the resources being requested. With an RPT, client applications can
        gain access to protected resources at the resource server.

        :return:
        """
        self.__connection.add_param_headers("Authorization", "Bearer " + token)
        params_path = {"realm-name": self.__realm_name, "resource-server-id": resource_server_id}
        data_raw = self.__connection.raw_get(URL_ENTITLEMENT.format(**params_path))

        return raise_error_from_response(data_raw, KeycloakGetError)

    def instropect(self, token, rpt, token_type_hint="requesting_party_token"):
        """
        The introspection endpoint is used to retrieve the active state of a token. It is can only be
        invoked by confidential clients.

        https://tools.ietf.org/html/rfc7662

        :param token:
        :param rpt:
        :param token_type_hint:

        :return:
        """
        params_path = {"realm-name": self.__realm_name}
        payload = {"client_id": self.__client_id, "token": rpt,
                   'token_type_hint': token_type_hint}

        if self.__client_secret_key:
            payload.update({"client_secret": self.__client_secret_key})

        self.__connection.add_param_headers("Authorization", "Bearer " + token)
        data_raw = self.__connection.raw_post(URL_INTROSPECT.format(**params_path),
                                              data=payload)

        return raise_error_from_response(data_raw, KeycloakGetError)