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from oic.exception import MissingAttribute

from oic import oic

from oic.oauth2 import rndstr, ErrorResponse

from oic.oic import ProviderConfigurationResponse, AuthorizationResponse

from oic.oic import RegistrationResponse

from oic.oic import AuthorizationRequest

from oic.utils.authn.client import CLIENT_AUTHN_METHOD

import logging

logger = logging.getLogger(__name__)

import conf

class OIDCError(Exception):

    pass

class Client(oic.Client):

    def __init__(self, client_id=None, ca_certs=None,

                 client_prefs=None, client_authn_method=None, keyjar=None,

                 verify_ssl=True, behaviour=None):

        oic.Client.__init__(self, client_id, ca_certs, client_prefs,

                            client_authn_method, keyjar, verify_ssl)

        if behaviour:

            self.behaviour = behaviour

    def create_authn_request(self, session, acr_value=None):

        session["state"] = rndstr()

        session["nonce"] = rndstr()

        request_args = {

            "response_type": self.behaviour["response_type"],

            "scope": self.behaviour["scope"],

            "state": session["state"],

            # "nonce": session["nonce"],

            "redirect_uri": self.registration_response["redirect_uris"][0]

        }

        if acr_value is not None:

            request_args["acr_values"] = acr_value

        cis = self.construct_AuthorizationRequest(request_args=request_args)

        logger.debug("request: %s" % cis)

        url, body, ht_args, cis = self.uri_and_body(AuthorizationRequest, cis,

                                                    method="GET",

                                                    request_args=request_args)

        logger.debug("body: %s" % body)

        logger.info("URL: %s" % url)

        logger.debug("ht_args: %s" % ht_args)

        return str(url), ht_args

    def callback(self, response):

        """

        This is the method that should be called when an AuthN response has been

        received from the OP.

        :param response: The URL returned by the OP

        :return:

        """

        authresp = self.parse_response(AuthorizationResponse, response,

                                       sformat="dict", keyjar=self.keyjar)

        if isinstance(authresp, ErrorResponse):

            return OIDCError("Access denied")

        try:

            self.id_token[authresp["state"]] = authresp["id_token"]

        except KeyError:

            pass

        if self.behaviour["response_type"] == "code":

            # get the access token

            try:

                args = {

                    "grant_type": "authorization_code",

                    "code": authresp["code"],

                    "redirect_uri": self.registration_response[

                        "redirect_uris"][0],

                    "client_id": self.client_id,

                    "client_secret": self.client_secret

                }

                atresp = self.do_access_token_request(

                    scope="openid", state=authresp["state"], request_args=args,

                    authn_method=self.registration_response["token_endpoint_auth_method"])

            except Exception as err:

                logger.error("%s" % err)

                raise

            if isinstance(atresp, ErrorResponse):

                raise OIDCError("Invalid response %s." % atresp["error"])

        inforesp = self.do_user_info_request(state=authresp["state"],

                                             behavior='use_authorization_header')

        if isinstance(inforesp, ErrorResponse):

            raise OIDCError("Invalid response %s." % inforesp["error"])

        userinfo = inforesp.to_dict()

        logger.debug("UserInfo: %s" % inforesp)

        return userinfo

def create_client(**kwargs):

    """

    kwargs = config.CLIENT.iteritems

    """

    _key_set = set(kwargs.keys())

    args = {}

    for param in ["verify_ssl"]:

        try:

            args[param] = kwargs[param]

        except KeyError:

            pass

        else:

            _key_set.discard(param)

    client = Client(client_authn_method=CLIENT_AUTHN_METHOD,

                    behaviour=kwargs["behaviour"],

                    verify_ssl=conf.VERIFY_SSL, **args)

    # The behaviour parameter is not significant for the election process

    _key_set.discard("behaviour")

    for param in ["allow"]:

        try:

            setattr(client, param, kwargs[param])

        except KeyError:

            pass

        else:

            _key_set.discard(param)

    if _key_set == set(["client_info"]):  # Everything dynamic

        # There has to be a userid

        if not userid:

            raise MissingAttribute("Missing userid specification")

        # Find the service that provides information about the OP

        issuer = client.wf.discovery_query(userid)

        # Gather OP information

        _ = client.provider_config(issuer)

        # register the client

        _ = client.register(client.provider_info["registration_endpoint"],

                            **kwargs["client_info"])

    elif _key_set == set(["client_info", "srv_discovery_url"]):

        # Ship the webfinger part

        # Gather OP information

        _ = client.provider_config(kwargs["srv_discovery_url"])

        # register the client

        _ = client.register(client.provider_info["registration_endpoint"],

                            **kwargs["client_info"])

    elif _key_set == set(["provider_info", "client_info"]):

        client.handle_provider_config(

            ProviderConfigurationResponse(**kwargs["provider_info"]),

            kwargs["provider_info"]["issuer"])

        _ = client.register(client.provider_info["registration_endpoint"],

                            **kwargs["client_info"])

    elif _key_set == set(["provider_info", "client_registration"]):

        client.handle_provider_config(

            ProviderConfigurationResponse(**kwargs["provider_info"]),

            kwargs["provider_info"]["issuer"])

        client.store_registration_info(RegistrationResponse(

            **kwargs["client_registration"]))

    elif _key_set == set(["srv_discovery_url", "client_registration"]):

        _ = client.provider_config(kwargs["srv_discovery_url"])

        client.store_registration_info(RegistrationResponse(

            **kwargs["client_registration"]))

    else:

        raise Exception("Configuration error ?")

    return client