# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
# Copyright 2020 The Matrix.org Foundation C.I.C
#
# 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 typing import Optional, Tuple

import synapse.server
from synapse.api.constants import EventTypes
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.events import EventBase
from synapse.events.snapshot import EventContext
from synapse.types import Collection

"""
Utility functions for poking events into the storage of the server under test.
"""


async def inject_member_event(
    hs: synapse.server.HomeServer,
    room_id: str,
    sender: str,
    membership: str,
    target: Optional[str] = None,
    extra_content: Optional[dict] = None,
    **kwargs
) -> EventBase:
    """Inject a membership event into a room."""
    if target is None:
        target = sender

    content = {"membership": membership}
    if extra_content:
        content.update(extra_content)

    return await inject_event(
        hs,
        room_id=room_id,
        type=EventTypes.Member,
        sender=sender,
        state_key=target,
        content=content,
        **kwargs
    )


async def inject_event(
    hs: synapse.server.HomeServer,
    room_version: Optional[str] = None,
    prev_event_ids: Optional[Collection[str]] = None,
    **kwargs
) -> EventBase:
    """Inject a generic event into a room

    Args:
        hs: the homeserver under test
        room_version: the version of the room we're inserting into.
            if not specified, will be looked up
        prev_event_ids: prev_events for the event. If not specified, will be looked up
        kwargs: fields for the event to be created
    """
    event, context = await create_event(hs, room_version, prev_event_ids, **kwargs)

    await hs.get_storage().persistence.persist_event(event, context)

    return event


async def create_event(
    hs: synapse.server.HomeServer,
    room_version: Optional[str] = None,
    prev_event_ids: Optional[Collection[str]] = None,
    **kwargs
) -> Tuple[EventBase, EventContext]:
    if room_version is None:
        room_version = await hs.get_datastore().get_room_version_id(kwargs["room_id"])

    builder = hs.get_event_builder_factory().for_room_version(
        KNOWN_ROOM_VERSIONS[room_version], kwargs
    )
    event, context = await hs.get_event_creation_handler().create_new_client_event(
        builder, prev_event_ids=prev_event_ids
    )

    return event, context