# -*- coding: utf-8 -*-
# Copyright 2014-2016 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 mock import Mock

from twisted.internet import defer

from synapse.api.constants import EventTypes, Membership, RoomVersions
from synapse.types import RoomID, UserID

from tests import unittest
from tests.utils import create_room, setup_test_homeserver


class RedactionTestCase(unittest.TestCase):
    @defer.inlineCallbacks
    def setUp(self):
        hs = yield setup_test_homeserver(
            self.addCleanup, resource_for_federation=Mock(), http_client=None
        )

        self.store = hs.get_datastore()
        self.event_builder_factory = hs.get_event_builder_factory()
        self.event_creation_handler = hs.get_event_creation_handler()

        self.u_alice = UserID.from_string("@alice:test")
        self.u_bob = UserID.from_string("@bob:test")

        self.room1 = RoomID.from_string("!abc123:test")

        yield create_room(hs, self.room1.to_string(), self.u_alice.to_string())

        self.depth = 1

    @defer.inlineCallbacks
    def inject_room_member(
        self, room, user, membership, replaces_state=None, extra_content={}
    ):
        content = {"membership": membership}
        content.update(extra_content)
        builder = self.event_builder_factory.new(
            RoomVersions.V1,
            {
                "type": EventTypes.Member,
                "sender": user.to_string(),
                "state_key": user.to_string(),
                "room_id": room.to_string(),
                "content": content,
            }
        )

        event, context = yield self.event_creation_handler.create_new_client_event(
            builder
        )

        yield self.store.persist_event(event, context)

        defer.returnValue(event)

    @defer.inlineCallbacks
    def inject_message(self, room, user, body):
        self.depth += 1

        builder = self.event_builder_factory.new(
            RoomVersions.V1,
            {
                "type": EventTypes.Message,
                "sender": user.to_string(),
                "state_key": user.to_string(),
                "room_id": room.to_string(),
                "content": {"body": body, "msgtype": u"message"},
            }
        )

        event, context = yield self.event_creation_handler.create_new_client_event(
            builder
        )

        yield self.store.persist_event(event, context)

        defer.returnValue(event)

    @defer.inlineCallbacks
    def inject_redaction(self, room, event_id, user, reason):
        builder = self.event_builder_factory.new(
            RoomVersions.V1,
            {
                "type": EventTypes.Redaction,
                "sender": user.to_string(),
                "state_key": user.to_string(),
                "room_id": room.to_string(),
                "content": {"reason": reason},
                "redacts": event_id,
            }
        )

        event, context = yield self.event_creation_handler.create_new_client_event(
            builder
        )

        yield self.store.persist_event(event, context)

    @defer.inlineCallbacks
    def test_redact(self):
        yield self.inject_room_member(self.room1, self.u_alice, Membership.JOIN)

        msg_event = yield self.inject_message(self.room1, self.u_alice, u"t")

        # Check event has not been redacted:
        event = yield self.store.get_event(msg_event.event_id)

        self.assertObjectHasAttributes(
            {
                "type": EventTypes.Message,
                "user_id": self.u_alice.to_string(),
                "content": {"body": "t", "msgtype": "message"},
            },
            event,
        )

        self.assertFalse("redacted_because" in event.unsigned)

        # Redact event
        reason = "Because I said so"
        yield self.inject_redaction(
            self.room1, msg_event.event_id, self.u_alice, reason
        )

        event = yield self.store.get_event(msg_event.event_id)

        self.assertEqual(msg_event.event_id, event.event_id)

        self.assertTrue("redacted_because" in event.unsigned)

        self.assertObjectHasAttributes(
            {
                "type": EventTypes.Message,
                "user_id": self.u_alice.to_string(),
                "content": {},
            },
            event,
        )

        self.assertObjectHasAttributes(
            {
                "type": EventTypes.Redaction,
                "user_id": self.u_alice.to_string(),
                "content": {"reason": reason},
            },
            event.unsigned["redacted_because"],
        )

    @defer.inlineCallbacks
    def test_redact_join(self):
        yield self.inject_room_member(self.room1, self.u_alice, Membership.JOIN)

        msg_event = yield self.inject_room_member(
            self.room1, self.u_bob, Membership.JOIN, extra_content={"blue": "red"}
        )

        event = yield self.store.get_event(msg_event.event_id)

        self.assertObjectHasAttributes(
            {
                "type": EventTypes.Member,
                "user_id": self.u_bob.to_string(),
                "content": {"membership": Membership.JOIN, "blue": "red"},
            },
            event,
        )

        self.assertFalse(hasattr(event, "redacted_because"))

        # Redact event
        reason = "Because I said so"
        yield self.inject_redaction(
            self.room1, msg_event.event_id, self.u_alice, reason
        )

        # Check redaction

        event = yield self.store.get_event(msg_event.event_id)

        self.assertTrue("redacted_because" in event.unsigned)

        self.assertObjectHasAttributes(
            {
                "type": EventTypes.Member,
                "user_id": self.u_bob.to_string(),
                "content": {"membership": Membership.JOIN},
            },
            event,
        )

        self.assertObjectHasAttributes(
            {
                "type": EventTypes.Redaction,
                "user_id": self.u_alice.to_string(),
                "content": {"reason": reason},
            },
            event.unsigned["redacted_because"],
        )