# Copyright (c) 2014 Mirantis Inc.
#
# 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 oslo_utils import uuidutils
from saharaclient.api import base as sahara_base
from saharaclient import client as sahara_client
import six

from heat.common import exception
from heat.common.i18n import _
from heat.common.i18n import _LI
from heat.engine.clients import client_plugin
from heat.engine import constraints

LOG = logging.getLogger(__name__)


class SaharaClientPlugin(client_plugin.ClientPlugin):

    exceptions_module = sahara_base

    def _create(self):
        con = self.context
        endpoint_type = self._get_client_option('sahara', 'endpoint_type')
        endpoint = self.url_for(service_type='data-processing',
                                endpoint_type=endpoint_type)
        args = {
            'service_type': 'data-processing',
            'input_auth_token': self.auth_token,
            'auth_url': con.auth_url,
            'project_name': con.tenant,
            'sahara_url': endpoint,
            'insecure': self._get_client_option('sahara', 'insecure'),
            'cacert': self._get_client_option('sahara', 'ca_file')
        }
        client = sahara_client.Client('1.1', **args)
        return client

    def is_not_found(self, ex):
        return (isinstance(ex, sahara_base.APIException) and
                ex.error_code == 404)

    def is_over_limit(self, ex):
        return (isinstance(ex, sahara_base.APIException) and
                ex.error_code == 413)

    def is_conflict(self, ex):
        return (isinstance(ex, sahara_base.APIException) and
                ex.error_code == 409)

    def is_not_registered(self, ex):
        return (isinstance(ex, sahara_base.APIException) and
                ex.error_code == 400 and
                ex.error_name == 'IMAGE_NOT_REGISTERED')

    def get_image_id(self, image_identifier):
        '''
        Return an id for the specified image name or identifier.

        :param image_identifier: image name or a UUID-like identifier
        :returns: the id of the requested :image_identifier:
        :raises: exception.ImageNotFound,
                 exception.PhysicalResourceNameAmbiguity
        '''
        if uuidutils.is_uuid_like(image_identifier):
            try:
                image_id = self.client().images.get(image_identifier).id
            except sahara_base.APIException as ex:
                if self.is_not_registered(ex):
                    image_id = self.get_image_id_by_name(image_identifier)
        else:
            image_id = self.get_image_id_by_name(image_identifier)
        return image_id

    def get_image_id_by_name(self, image_identifier):
        '''
        Return an id for the specified image name.

        :param image_identifier: image name
        :returns: the id of the requested :image_identifier:
        :raises: exception.ImageNotFound,
                 exception.PhysicalResourceNameAmbiguity
        '''
        try:
            filters = {'name': image_identifier}
            image_list = self.client().images.find(**filters)
        except sahara_base.APIException as ex:
            raise exception.Error(
                _("Error retrieving image list from sahara: "
                  "%s") % six.text_type(ex))
        num_matches = len(image_list)
        if num_matches == 0:
            LOG.info(_LI("Image %s was not found in sahara images"),
                     image_identifier)
            raise exception.ImageNotFound(image_name=image_identifier)
        elif num_matches > 1:
            LOG.info(_LI("Multiple images %s were found in sahara with name"),
                     image_identifier)
            raise exception.PhysicalResourceNameAmbiguity(
                name=image_identifier)
        else:
            return image_list[0].id


class ImageConstraint(constraints.BaseCustomConstraint):

    expected_exceptions = (exception.ImageNotFound,
                           exception.PhysicalResourceNameAmbiguity,)

    def validate_with_client(self, client, value):
        client.client_plugin('sahara').get_image_id(value)
