from PLC.Faults import *
from PLC.Method import Method
from PLC.Parameter import Parameter, Mixed
from PLC.NodeGroups import NodeGroup, NodeGroups
from PLC.Auth import Auth

can_update = lambda (field, value): field in ['groupname','value']

class UpdateNodeGroup(Method):
    """
    Updates a custom node group.

    Returns 1 if successful, faults otherwise.
    """

    roles = ['admin']

    nodegroup_fields = dict(filter(can_update, NodeGroup.fields.items()))

    accepts = [
        Auth(),
        Mixed(NodeGroup.fields['nodegroup_id'],
              NodeGroup.fields['groupname']),
        nodegroup_fields
        ]

    returns = Parameter(int, '1 if successful')

    def call(self, auth, nodegroup_id_or_name, nodegroup_fields):
        nodegroup_fields = dict(filter(can_update, nodegroup_fields.items()))

        # Get nodegroup information
        nodegroups = NodeGroups(self.api, [nodegroup_id_or_name])
        if not nodegroups:
            raise PLCInvalidArgument, "No such nodegroup %r"%nodegroup_id_or_name
        nodegroup = nodegroups[0]

        nodegroup.update(nodegroup_fields)
        nodegroup.sync()

        # Logging variables
        self.event_objects = {'NodeGroup': [nodegroup['nodegroup_id']]}
        self.message = 'Node group %d updated: %s' % \
                (nodegroup['nodegroup_id'], ", ".join(nodegroup_fields.keys()))
        return 1