# Copyright 2013 Eucalyptus Systems, Inc.
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from euca2ools.commands.argtypes import delimited_list
from euca2ools.commands.elasticloadbalancing import ELBRequest
from requestbuilder import Arg, EMPTY


class SetLoadBalancerPoliciesForBackendServer(ELBRequest):
    DESCRIPTION = ('Change the policies associated with a port on which load-'
                   'balanced back end servers listen.')
    ARGS = [Arg('LoadBalancerName', metavar='ELB',
                help='name of the load balancer to modify (required)'),
            Arg('-i', '--instance-port', dest='InstancePort', metavar='PORT',
                type=int, required=True,
                help='port number of the back end server (required)'),
            Arg('-p', '--policy-names', dest='PolicyNames.member',
                metavar='POLICY1,POLICY2,...', type=delimited_list(','),
                required=True, help='''list of policies to associate with the
                back end server (required)''')]

    def preprocess(self):
        if not self.args.get('PolicyNames.member'):
            self.params['PolicyNames'] = EMPTY