# vim: tabstop=4 shiftwidth=4 softtabstop=4

#
#    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 heat.engine import clients
from heat.openstack.common import log as logging
from heat.engine import resource
from heat.engine.resources.quantum import quantum
from heat.engine.resources.vpc import VPC

if clients.quantumclient is not None:
    from quantumclient.common.exceptions import QuantumClientException

logger = logging.getLogger(__name__)


class RouteTable(resource.Resource):
    tags_schema = {'Key': {'Type': 'String',
                           'Required': True},
                   'Value': {'Type': 'String',
                             'Required': True}}

    properties_schema = {
        'VpcId': {
            'Type': 'String',
            'Required': True},
        'Tags': {'Type': 'List', 'Schema': {
            'Type': 'Map',
            'Implemented': False,
            'Schema': tags_schema}}
    }

    def handle_create(self):
        client = self.quantum()
        props = {'name': self.physical_resource_name()}
        router = client.create_router({'router': props})['router']
        self.resource_id_set(router['id'])

    def check_create_complete(self, *args):
        client = self.quantum()
        attributes = client.show_router(
            self.resource_id)['router']
        if not quantum.QuantumResource.is_built(attributes):
            return False

        network_id = self.properties.get('VpcId')
        default_router = VPC.router_for_vpc(client, network_id)
        if default_router and default_router.get('external_gateway_info'):
            # the default router for the VPC is connected
            # to the external router, so do it for this too.
            external_network_id = default_router[
                'external_gateway_info']['network_id']
            client.add_gateway_router(self.resource_id, {
                'network_id': external_network_id})
        return True

    def handle_delete(self):
        client = self.quantum()

        router_id = self.resource_id
        try:
            client.delete_router(router_id)
        except QuantumClientException as ex:
            if ex.status_code != 404:
                raise ex

        # just in case this router has been added to a gateway, remove it
        try:
            client.remove_gateway_router(router_id)
        except QuantumClientException as ex:
            if ex.status_code != 404:
                raise ex


class SubnetRouteTableAssocation(resource.Resource):

    properties_schema = {
        'RouteTableId': {
            'Type': 'String',
            'Required': True},
        'SubnetId': {
            'Type': 'String',
            'Required': True}
    }

    def handle_create(self):
        client = self.quantum()
        subnet_id = self.properties.get('SubnetId')

        router_id = self.properties.get('RouteTableId')

        #remove the default router association for this subnet.
        try:
            previous_router = self._router_for_subnet(subnet_id)
            if previous_router:
                client.remove_interface_router(
                    previous_router['id'],
                    {'subnet_id': subnet_id})
        except QuantumClientException as ex:
            if ex.status_code != 404:
                raise ex

        client.add_interface_router(
            router_id, {'subnet_id': subnet_id})

    def _router_for_subnet(self, subnet_id):
        client = self.quantum()
        subnet = client.show_subnet(
            subnet_id)['subnet']
        network_id = subnet['network_id']
        return VPC.router_for_vpc(client, network_id)

    def handle_delete(self):
        client = self.quantum()
        subnet_id = self.properties.get('SubnetId')

        router_id = self.properties.get('RouteTableId')

        try:
            client.remove_interface_router(router_id, {
                'subnet_id': subnet_id})
        except QuantumClientException as ex:
            if ex.status_code != 404:
                raise ex

        # add back the default router
        try:
            default_router = self._router_for_subnet(subnet_id)
            if default_router:
                client.add_interface_router(
                    default_router['id'], {'subnet_id': subnet_id})
        except QuantumClientException as ex:
            if ex.status_code != 404:
                raise ex


def resource_mapping():
    if clients.quantumclient is None:
        return {}

    return {
        'AWS::EC2::RouteTable': RouteTable,
        'AWS::EC2::SubnetRouteTableAssocation': SubnetRouteTableAssocation,
    }