# Copyright 2014 Eucalyptus Systems, Inc.
#
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from requestbuilder import Arg, MutuallyExclusiveArgList

from euca2ools.commands.ec2 import EC2Request


class DescribeVpcAttribute(EC2Request):
    DESCRIPTION = 'Show an attribute of a VPC'
    ARGS = [Arg('VpcId', metavar='VPC',
                help='ID of the VPC to show info for (required)'),
            MutuallyExclusiveArgList(
                Arg('-d', '--dns-hostnames', dest='Attribute',
                    action='store_const', const='enableDnsHostnames',
                    help='''show whether instances in the VPC are
                    assigned DNS hostnames'''),
                Arg('-s', '--dns-support', dest='Attribute',
                    action='store_const', const='enableDnsSupport',
                    help='show whether DNS resolution is enabled'))
            .required()]

    def print_result(self, result):
        if self.args['Attribute'] == 'enableDnsHostnames':
            print self.tabify(('RETURN',
                               result['enableDnsHostnames'].get('value')))
        elif self.args['Attribute'] == 'enableDnsSupport':
            print self.tabify(('RETURN',
                               result['enableDnsSupport'].get('value')))