#
# Copyright (c) 2005-2009 Apple Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##

from twisted.internet.defer import inlineCallbacks, succeed, returnValue
from twistedcaldav.method import report_common

@inlineCallbacks
def getCalendarObjectForPrincipals(request, principal, uid):
    """
    Get a copy of the event for a principal.
    """
    
    result = {}
    result["resource"] = None
    result["resource_name"] = None
    result["calendar_collection"] = None
    result["calendar_collection_uri"] = None
    if principal:
        # Get principal's calendar-home
        calendar_home = principal.calendarHome()
        
        # FIXME: because of the URL->resource request mapping thing, we have to force the request
        # to recognize this resource
        request._rememberResource(calendar_home, calendar_home.url())

        # Run a UID query against the UID

        def queryCalendarCollection(collection, uri):
            rname = collection.index().resourceNameForUID(uid)
            if rname:
                result["resource"] = collection.getChild(rname)
                result["resource_name"] = rname
                result["calendar_collection"] = collection
                result["calendar_collection_uri"] = uri
                return succeed(False)
            else:
                return succeed(True)
        
        # NB We are by-passing privilege checking here. That should be OK as the data found is not
        # exposed to the user.
        yield report_common.applyToCalendarCollections(calendar_home, request, calendar_home.url(), "infinity", queryCalendarCollection, None)

    returnValue((result["resource"], result["resource_name"], result["calendar_collection"], result["calendar_collection_uri"],))