# Copyright (c) 2015 b<>com
#
# Authors: Jean-Emile DARTOIS <jean-emile.dartois@b-com.com>
#
# 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.
#
from oslo_log import log

from watcher.applier.actions import base as baction
from watcher.common import exception
from watcher.decision_engine.solution import base

LOG = log.getLogger(__name__)


class DefaultSolution(base.BaseSolution):
    def __init__(self, goal, strategy):
        """Stores a set of actions generated by a strategy

        The DefaultSolution class store a set of actions generated by a
        strategy in order to achieve the goal.

        :param goal: Goal associated to this solution
        :type goal: :py:class:`~.base.Goal` instance
        :param strategy: Strategy associated to this solution
        :type strategy: :py:class:`~.BaseStrategy` instance
        """
        super().__init__(goal, strategy)
        self._actions = []

    def add_action(self, action_type, input_parameters=None, resource_id=None):
        if input_parameters is not None:
            if baction.BaseAction.RESOURCE_ID in input_parameters.keys():
                raise exception.ReservedWord(name=baction.BaseAction.
                                             RESOURCE_ID)
        else:
            input_parameters = {}

        if resource_id is not None:
            input_parameters[baction.BaseAction.RESOURCE_ID] = resource_id
        action = {
            'action_type': action_type,
            'input_parameters': input_parameters
        }
        if action not in self._actions:
            self._actions.append(action)
        else:
            LOG.warning('Action %s has been added into the solution, '
                        'duplicate action will be dropped.', str(action))

    def __str__(self):
        return "\n".join(self._actions)

    @property
    def actions(self):
        """Get the current actions of the solution"""
        return self._actions
