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from requestbuilder import Arg, MutuallyExclusiveArgList
from requestbuilder.mixins import TabifyingMixin

from euca2ools.commands.argtypes import binary_tag_def, delimited_list
from euca2ools.commands.elasticloadbalancing import ELBRequest
from euca2ools.commands.elasticloadbalancing.argtypes import listener


class CreateLoadBalancer(ELBRequest, TabifyingMixin):
    DESCRIPTION = ('Create a load balancer\n\nAfter the load balancer is '
                   'created, instances must be registered with it separately.')
    ARGS = [Arg('LoadBalancerName', metavar='ELB',
                help='name of the new load balancer (required)'),
            MutuallyExclusiveArgList(
                Arg('-s', '--subnets', metavar='SUBNET1,SUBNET2,...',
                    dest='Subnets.member', type=delimited_list(','),
                    help='''[VPC only] subnets the load balancer should run in
                    (required)'''),
                Arg('-z', '--availability-zones', metavar='ZONE1,ZONE2,...',
                    dest='AvailabilityZones.member', type=delimited_list(','),
                    help='''[Non-VPC only] availability zones the load balancer
                    should run in (required)'''))
            .required(),
            Arg('-l', '--listener', dest='Listeners.member', action='append',
                metavar=('"lb-port=PORT, protocol={HTTP,HTTPS,SSL,TCP}, '
                         'instance-port=PORT, instance-protocol={HTTP,HTTPS,'
                         'SSL,TCP}, cert-id=ARN"'), required=True,
                type=listener,
                help='''port/protocol settings for the load balancer, where
                lb-port is the external port number, protocol is the external
                protocol, instance-port is the back end server port number,
                instance-protocol is the protocol to use for routing traffic to
                back end instances, and cert-id is the ARN of the server
                certificate to use for encrypted connections.  lb-port,
                protocol, and instance-port are required.  This option may be
                used multiple times.  (at least 1 required)'''),
            Arg('-i', '--scheme', dest='Scheme', choices=('internal',),
                metavar='internal', help='''[VPC only] "internal" to make the
                new load balancer private to a VPC'''),
            Arg('-g', '--security-groups', dest='SecurityGroups.member',
                metavar='GROUP1,GROUP2,...', type=delimited_list(','),
                help='''[VPC only] IDs of the security groups to assign to the
                new load balancer'''),
            Arg('-t', '--tag', dest='Tags.member', action='append',
                metavar='KEY=VALUE', type=binary_tag_def,
                help='key and value of a tag to add to the new load balancer')]

    def print_result(self, result):
        print self.tabify(('DNS_NAME', result.get('DNSName')))