# Copyright 2012 OpenStack LLC.
# All 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.

from heatclient.common import base
import heatclient.exc as exc

DEFAULT_PAGE_SIZE = 20


class Resource(base.Resource):
    def __repr__(self):
        return "<Resource %s>" % self._info

    def update(self, **fields):
        self.manager.update(self, **fields)

    def delete(self):
        return self.manager.delete(self)

    def data(self, **kwargs):
        return self.manager.data(self, **kwargs)


class ResourceManager(base.Manager):
    resource_class = Resource

    def list(self, stack_id):
        """Get a list of resources.
        :rtype: list of :class:`Resource`
        """
        url = '/stacks/%s/resources' % stack_id
        return self._list(url, "resources")

    def get(self, stack_id, resource_id):
        """Get the details for a specific resource.

        :param stack_id: ID of stack containing the resource
        :param resource_id: ID of resource to get the details for
        """
        resp, body = self._get_resolve_fallback(stack_id, resource_id,
            '/stacks/%s/resources/%s')
        return Resource(self, body['resource'])

    def metadata(self, stack_id, resource_id):
        """Get the metadata for a specific resource.

        :param stack_id: ID of stack containing the resource
        :param resource_id: ID of resource to get metadata for
        """
        resp, body = self._get_resolve_fallback(stack_id, resource_id,
            '/stacks/%s/resources/%s/metadata')
        return Resource(self, body['metadata'])

    def _get_resolve_fallback(self, stack_id, resource_id, path_pattern):
        try:
            resp, body = self.api.json_request('GET',
                path_pattern % (stack_id, resource_id))
        except exc.HTTPNotFound:
            stack_id = self._resolve_stack_id(stack_id)
            resp, body = self.api.json_request('GET',
                path_pattern % (stack_id, resource_id))
        return (resp, body)

    def _resolve_stack_id(self, stack_id):
        resp, body = self.api.json_request('GET',
                '/stacks/%s' % stack_id)
        stack = body['stack']
        return '%s/%s' % (stack['stack_name'], stack['id'])