# Copyright 2013-2016 Hewlett Packard Enterprise Development LP
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from requestbuilder import Arg, MutuallyExclusiveArgList

from euca2ools.commands.ec2 import EC2Request


class CreateRoute(EC2Request):
    DESCRIPTION = 'Add a route to a VPC route table'
    ARGS = [Arg('RouteTableId', metavar='RTABLE',
                help='ID of the route table to add the route to (required)'),
            Arg('-r', '--cidr', dest='DestinationCidrBlock',
                metavar='CIDR', required=True,
                help='CIDR address block the route should affect (required)'),
            MutuallyExclusiveArgList(
                Arg('-g', '--gateway-id', metavar='GATEWAY', route_to=None,
                    help='ID of an Internet, NAT, or virtual private '
                         'gateway to target'),
                Arg('-i', '--instance', dest='InstanceId', metavar='INSTANCE',
                    help='ID of a NAT instance to target'),
                Arg('-n', '--network-interface', dest='NetworkInterfaceId',
                    help='ID of a network interface to target'),
                Arg('-p', '--vpc-peering-connection', metavar='PEERCON',
                    dest='VpcPeeringConnectionId',
                    help='ID of a VPC peering connection to target'))
            .required()]

    def configure(self):
        EC2Request.configure(self)
        gateway_id = self.args['gateway_id']
        if gateway_id:
            if gateway_id.startswith('nat-'):
                self.params['NatGatewayId'] = gateway_id
            else:
                self.params['GatewayId'] = gateway_id

    def print_result(self, _):
        target = (self.args.get('GatewayId') or self.args.get('InstanceId') or
                  self.args.get('NetworkInterfaceId') or
                  self.args.get('NatGatewayId') or
                  self.args.get('VpcPeeringConnectionId'))
        print self.tabify(('ROUTE', target, self.args['DestinationCidrBlock']))
