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# -*- coding: utf-8 -*-
# Copyright 2015 OpenMarket Ltd
#
# 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 import defer


class AccountDataEventSource(object):
    def __init__(self, hs):
        self.store = hs.get_datastore()

    def get_current_key(self, direction='f'):
        return self.store.get_max_account_data_stream_id()

    @defer.inlineCallbacks
    def get_new_events(self, user, from_key, **kwargs):
        user_id = user.to_string()
        last_stream_id = from_key

        current_stream_id = yield self.store.get_max_account_data_stream_id()

        results = []
        tags = yield self.store.get_updated_tags(user_id, last_stream_id)

        for room_id, room_tags in tags.items():
            results.append({
                "type": "m.tag",
                "content": {"tags": room_tags},
                "room_id": room_id,
            })

        account_data, room_account_data = (
            yield self.store.get_updated_account_data_for_user(user_id, last_stream_id)
        )

        for account_data_type, content in account_data.items():
            results.append({
                "type": account_data_type,
                "content": content,
            })

        for room_id, account_data in room_account_data.items():
            for account_data_type, content in account_data.items():
                results.append({
                    "type": account_data_type,
                    "content": content,
                    "room_id": room_id,
                })

        defer.returnValue((results, current_stream_id))

    @defer.inlineCallbacks
    def get_pagination_rows(self, user, config, key):
        defer.returnValue(([], config.to_id))