# Copyright 2018 AT&T Intellectual Property.  All other rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from urllib.parse import urlparse

from airflow.exceptions import AirflowException
from airflow.plugins_manager import AirflowPlugin
from airflow.utils.decorators import apply_defaults

import armada.common.client as client
import armada.common.session as session
from armada.exceptions import api_exceptions as errors

try:
    import service_endpoint
    from service_token import shipyard_service_token
    from ucp_base_operator import UcpBaseOperator
    from xcom_pusher import XcomPusher
except ImportError:
    from shipyard_airflow.plugins import service_endpoint
    from shipyard_airflow.plugins.service_token import shipyard_service_token
    from shipyard_airflow.plugins.ucp_base_operator import UcpBaseOperator
    from shipyard_airflow.plugins.xcom_pusher import XcomPusher


LOG = logging.getLogger(__name__)


class ArmadaBaseOperator(UcpBaseOperator):

    """Armada Base Operator

    All armada related workflow operators will use the aramda
    base operator as the parent and inherit attributes and methods
    from this class

    """

    @apply_defaults
    def __init__(self,
                 query={},
                 svc_session=None,
                 svc_token=None,
                 *args, **kwargs):
        """Initialization of ArmadaBaseOperator object.

        :param query: A dictionary containing explicit query string parameters
        :param svc_session: Keystone Session
        :param svc_token: Keystone Token

        The Armada operator assumes that prior steps have set xcoms for
        the action and the deployment configuration

        """

        super(ArmadaBaseOperator,
              self).__init__(
                  pod_selector_pattern=[{'pod_pattern': 'armada-api',
                                         'container': 'armada-api'}],
                  *args, **kwargs)
        self.query = query
        self.svc_session = svc_session
        self.svc_token = svc_token

    @shipyard_service_token
    def run_base(self, context):

        # Set up xcom_pusher to push values to xcom
        self.xcom_pusher = XcomPusher(self.task_instance)

        # Logs uuid of action performed by the Operator
        LOG.info("Armada Operator for action %s", self.action_id)

        # Set up armada client
        self.armada_client = self._init_armada_client(
            self.endpoints.endpoint_by_name(service_endpoint.ARMADA),
            self.svc_token
        )

    @staticmethod
    def _init_armada_client(armada_svc_endpoint, svc_token):

        LOG.info("Armada endpoint is %s", armada_svc_endpoint)

        # Parse Armada Service Endpoint
        armada_url = urlparse(armada_svc_endpoint)

        # Build a ArmadaSession with credentials and target host
        # information.
        LOG.info("Build Armada Session")
        a_session = session.ArmadaSession(host=armada_url.hostname,
                                          port=armada_url.port,
                                          scheme='http',
                                          token=svc_token,
                                          marker=None)

        # Raise Exception if we are not able to set up the session
        if a_session:
            LOG.info("Successfully Set Up Armada Session")
        else:
            raise AirflowException("Failed to set up Armada Session!")

        # Use the ArmadaSession to build a ArmadaClient that can
        # be used to make one or more API calls
        LOG.info("Create Armada Client")
        _armada_client = client.ArmadaClient(a_session)

        # Raise Exception if we are not able to build armada client
        if _armada_client:
            LOG.info("Successfully Set Up Armada client")

            return _armada_client
        else:
            raise AirflowException("Failed to set up Armada client!")

    def get_releases(self):
        """Retrieve all deployed releases"""
        try:
            get_releases_resp = self.armada_client.get_releases(
                query=self.query,
                timeout=self.dc['armada.get_releases_timeout']
            )
            return get_releases_resp['releases']
        except errors.ClientError as client_error:
            # Dump logs from Armada pods
            self.get_k8s_logs()
            raise AirflowException(client_error)


class ArmadaBaseOperatorPlugin(AirflowPlugin):

    """Creates ArmadaBaseOperator in Airflow."""

    name = 'armada_base_operator_plugin'
    operators = [ArmadaBaseOperator]