#
# Thierry Parmentelat - INRIA
#
from PLC.Faults import *
from PLC.Method import Method
from PLC.Parameter import Parameter, Mixed
from PLC.Auth import Auth

from PLC.Sites import Site, Sites
from PLC.Nodes import Nodes
from PLC.TagTypes import TagType, TagTypes
from PLC.SiteTags import SiteTag, SiteTags

# need to import so the core classes get decorated with caller_may_write_tag
from PLC.AuthorizeHelpers import AuthorizeHelpers

class DeleteSiteTag(Method):
    """
    Deletes the specified site setting

    Admins have full access.  Non-admins need to 
    (1) have at least one of the roles attached to the tagtype, 
    and (2) belong in the same site as the tagged subject.

    Returns 1 if successful, faults otherwise.
    """

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

    accepts = [
        Auth(),
        SiteTag.fields['site_tag_id']
        ]

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

    def call(self, auth, site_tag_id):
        site_tags = SiteTags(self.api, [site_tag_id])
        if not site_tags:
            raise PLCInvalidArgument, "No such site tag %r"%site_tag_id
        site_tag = site_tags[0]

        tag_type_id = site_tag['tag_type_id']
        tag_type = TagTypes (self.api,[tag_type_id])[0]

        sites = Sites (self.api, site_tag['site_id'])
        if not sites:
            raise PLCInvalidArgument, "No such site %d"%site_tag['site_id']
        site=sites[0]
        
        # check authorizations
        site.caller_may_write_tag(self.api,self.caller,tag_type)

        site_tag.delete()
        self.object_ids = [site_tag['site_tag_id']]

        return 1