# -*- coding: utf-8 -*-

"""Directory Services helper class."""


from __future__ import unicode_literals
from __future__ import print_function
from __future__ import division


from OpenDirectory import ODSession, ODNode, ODQuery, kODRecordTypeUsers, kODAttributeTypeRecordName, kODAttributeTypeStandardOnly, kODMatchEqualTo, kODRecordTypeGroups, kODRecordTypeUsers


__all__ = ["DSHelper", "DSHelperError"]


class DSHelperError(BaseException):
    pass


class DSHelper(object):
    """Wrapper for Directory Services."""
    
    def __init__(self):
        super(DSHelper, self).__init__()
        self.odsession = ODSession.defaultSession()
    
    def get_node(self, nodename):
        node, error = ODNode.nodeWithSession_name_error_(self.odsession, nodename, None)
        if node is None:
            raise DSHelperError("Couldn't open {} node: {}".format(nodename,
                                                                   error.localizedFailureReason()))
        return node
    
    def get_search_node(self):
        return self.get_node("Search")
    
    def find_groups_named(self, groupname, node=None):
        """Look up a group name and return an array of group records."""
        
        if node is None:
            node = self.get_search_node()
        
        odquery, error = ODQuery.queryWithNode_forRecordTypes_attribute_matchType_queryValues_returnAttributes_maximumResults_error_(         node,
            kODRecordTypeGroups,
            kODAttributeTypeRecordName,
            kODMatchEqualTo,
            groupname,
            kODAttributeTypeStandardOnly,
            0,
            None)
        if odquery is None:
            raise DSHelperError("Couldn't query {}: {}".format(node.nodeName,
                                                               error.localizedFailureReason()))
        
        result, error = odquery.resultsAllowingPartial_error_(False, None)
        if result is None:
            raise DSHelperError("Couldn't retrieve query results: {}".format(error.localizedFailureReason()))
        
        return result
    
    def find_users_named(self, username, node=None):
        """Look up a user name and return an array of user records."""
        
        if node is None:
            node = self.get_search_node()
        
        odquery, error = ODQuery.queryWithNode_forRecordTypes_attribute_matchType_queryValues_returnAttributes_maximumResults_error_(         node,
            kODRecordTypeUsers,
            kODAttributeTypeRecordName,
            kODMatchEqualTo,
            username,
            kODAttributeTypeStandardOnly,
            0,
            None)
        if odquery is None:
            raise DSHelperError("Couldn't query {}: {}".format(node.nodeName,
                                                               error.localizedFailureReason()))
        
        result, error = odquery.resultsAllowingPartial_error_(False, None)
        if result is None:
            raise DSHelperError("Couldn't retrieve query results: {}".format(error.localizedFailureReason()))
        
        return result
    
    def add_user_to_group(self, user, group):
        result, error = group.addMemberRecord_error_(user, None)
        if not result:
            if error:
                error_msg = ": " + error.localizedFailureReason()
            else:
                error_msg = ""
            raise DSHelperError("Couldn't add {} to {}{}".format(user.recordName,
                                                                 group.recordName,
                                                                 error_msg))
    
    def remove_user_from_group(self, user, group):
        result, error = group.removeMemberRecord_error_(user, None)
        if not result:
            if error:
                error_msg = ": " + error.localizedFailureReason()
            else:
                error_msg = ""
            raise DSHelperError("Couldn't remove {} from {}{}" % (user.recordName,
                                                                  group.recordName,
                                                                  error_msg))