#
# 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

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]
        site = Sites (self.api, site_tag['site_id'])
        
        # check authorizations
        if 'admin' in self.caller['roles']:
            pass
        elif not AuthorizeHelpers.person_access_tag_type (self.api, self.caller, tag_type):
            raise PLCPermissionDenied, "%s, no permission to use this tag type"%self.name
        elif AuthorizeHelpers.person_belongs_to_site (self.api, self.caller, site):
            pass
        else:
            raise PLCPermissionDenied, "%s: you must be part of the subject site"%self.name
            
        site_tag.delete()
        self.object_ids = [site_tag['site_tag_id']]

        return 1