# Copyright 2015 Rackspace Inc.
#
# Author: Tim Simmons <tim.simmons@rackspae.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.
import pecan
from oslo_log import log as logging

from designate import exceptions
from designate import policy
from designate import utils
from designate.api.v2.controllers import rest
from designate.objects.adapters import DesignateAdapter

LOG = logging.getLogger(__name__)


class ZoneExportController(rest.RestController):

    @pecan.expose(template=None, content_type='text/dns')
    @utils.validate_uuid('export_id')
    def get_all(self, export_id):
        context = pecan.request.environ['context']
        target = {'tenant_id': context.tenant}
        policy.check('zone_export', context, target)

        export = self.central_api.get_zone_export(context, export_id)

        if export.location and export.location.startswith('designate://'):
            return self.central_api.\
                export_zone(context, export['zone_id'])
        else:
            msg = 'Zone can not be exported synchronously'
            raise exceptions.BadRequest(msg)


class ZoneExportCreateController(rest.RestController):

    @pecan.expose(template='json:', content_type='application/json')
    @utils.validate_uuid('zone_id')
    def post_all(self, zone_id):
        """Create Zone Export"""
        request = pecan.request
        response = pecan.response
        context = request.environ['context']

        # Create the zone_export
        zone_export = self.central_api.create_zone_export(
            context, zone_id)
        response.status_int = 202

        LOG.info("Created %(zone_export)s", {'zone_export': zone_export})

        zone_export = DesignateAdapter.render(
            'API_v2', zone_export, request=request)

        response.headers['Location'] = zone_export['links']['self']
        return zone_export


class ZoneExportsController(rest.RestController):

    SORT_KEYS = ['created_at', 'id', 'updated_at']

    export = ZoneExportController()

    @pecan.expose(template='json:', content_type='application/json')
    @utils.validate_uuid('export_id')
    def get_one(self, export_id):
        """Get Zone Exports"""

        request = pecan.request
        context = request.environ['context']

        zone_export = self.central_api.get_zone_export(context, export_id)

        LOG.info("Retrieved %(export)s", {'export': zone_export})

        return DesignateAdapter.render(
            'API_v2',
            zone_export,
            request=request)

    @pecan.expose(template='json:', content_type='application/json')
    def get_all(self, **params):
        """List Zone Exports"""
        request = pecan.request
        context = request.environ['context']
        marker, limit, sort_key, sort_dir = utils.get_paging_params(
                context, params, self.SORT_KEYS)

        # Extract any filter params.
        accepted_filters = ('status', 'message', 'zone_id', )

        criterion = self._apply_filter_params(
            params, accepted_filters, {})

        zone_exports = self.central_api.find_zone_exports(
            context, criterion, marker, limit, sort_key, sort_dir)

        LOG.info("Retrieved %(exports)s",
                 {'exports': zone_exports})

        return DesignateAdapter.render(
            'API_v2',
            zone_exports,
            request=request)

    # NOTE: template=None is important here, template='json:' manifests
    #       in this bug: https://bugs.launchpad.net/designate/+bug/1592153
    @pecan.expose(template=None, content_type='application/json')
    @utils.validate_uuid('zone_export_id')
    def delete_one(self, zone_export_id):
        """Delete Zone Export"""
        request = pecan.request
        response = pecan.response
        context = request.environ['context']

        zone_export = self.central_api.delete_zone_export(
            context, zone_export_id)

        LOG.info("Deleted %(zone_export)s", {'zone_export': zone_export})

        response.status_int = 204

        return ''