# $Id$
# $URL$
#
# Thierry Parmentelat - INRIA
#
# $Revision: 9423 $
#

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

from PLC.Sites import Sites
from PLC.Nodes import Node, Nodes
from PLC.NodeTags import NodeTag, NodeTags

class UpdateNodeTag(Method):
    """
    Updates the value of an existing node tag

    Access rights depend on the node tag type.

    Returns 1 if successful, faults otherwise.
    """

    roles = ['admin', 'pi', 'tech', 'user']

    accepts = [
        Auth(),
        NodeTag.fields['node_tag_id'],
        NodeTag.fields['value']
        ]

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

    object_type = 'Node'

    def call(self, auth, node_tag_id, value):
        node_tags = NodeTags(self.api, [node_tag_id])
        if not node_tags:
            raise PLCInvalidArgument, "No such node tag %r"%node_tag_id
        node_tag = node_tags[0]

        ### reproducing a check from UpdateSliceTag, looks dumb though
        nodes = Nodes(self.api, [node_tag['node_id']])
        if not nodes:
            raise PLCInvalidArgument, "No such node %r"%node_tag['node_id']
        node = nodes[0]

        assert node_tag['node_tag_id'] in node['node_tag_ids']

        # check permission : it not admin, is the user affiliated with the right site
        if 'admin' not in self.caller['roles']:
            # locate node
            node = Nodes (self.api,[node['node_id']])[0]
            # locate site
            site = Sites (self.api, [node['site_id']])[0]
            # check caller is affiliated with this site
            if self.caller['person_id'] not in site['person_ids']:
                raise PLCPermissionDenied, "Not a member of the hosting site %s"%site['abbreviated_site']

            required_min_role = node_tag['min_role_id']
            if required_min_role is not None and \
                    min(self.caller['role_ids']) > required_min_role:
                raise PLCPermissionDenied, "Not allowed to modify the specified node tag, requires role %d",required_min_role

        node_tag['value'] = value
        node_tag.sync()

        self.object_ids = [node_tag['node_tag_id']]
        return 1