# -*- 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 tests import unittest
from twisted.internet import defer

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

from tests.utils import setup_test_homeserver

from mock import Mock


class RedactionTestCase(unittest.TestCase):

    @defer.inlineCallbacks
    def setUp(self):
        hs = yield setup_test_homeserver(
            resource_for_federation=Mock(),
            http_client=None,
        )

        self.store = hs.get_datastore()
        self.event_builder_factory = hs.get_event_builder_factory()
        self.handlers = hs.get_handlers()
        self.message_handler = self.handlers.message_handler

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

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

        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({
            "type": EventTypes.Member,
            "sender": user.to_string(),
            "state_key": user.to_string(),
            "room_id": room.to_string(),
            "content": content,
        })

        event, context = yield self.message_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({
            "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.message_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({
            "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.message_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"],
        )