/*
 *   Famedly Matrix SDK
 *   Copyright (C) 2019, 2020 Famedly GmbH
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero General Public License as
 *   published by the Free Software Foundation, either version 3 of the
 *   License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU Affero General Public License for more details.
 *
 *   You should have received a copy of the GNU Affero General Public License
 *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

import 'dart:async';
import 'dart:math';

import 'package:olm/olm.dart' as olm;
import 'package:test/test.dart';

import 'package:matrix/matrix.dart';
import 'package:matrix/src/models/timeline_chunk.dart';
import 'fake_client.dart';

void main() {
  group('Timeline', () {
    Logs().level = Level.error;
    final roomID = '!1234:example.com';
    var testTimeStamp = 0;
    var updateCount = 0;
    final insertList = <int>[];
    final changeList = <int>[];
    final removeList = <int>[];
    var olmEnabled = true;
    var currentPoison = 0;

    final countStream = StreamController<int>.broadcast();
    Future<int> waitForCount(int count) async {
      if (updateCount == count) {
        return Future.value(updateCount);
      }

      final completer = Completer<int>();

      StreamSubscription<int>? sub;
      sub = countStream.stream.listen((newCount) async {
        if (newCount == count) {
          await sub?.cancel();
          completer.complete(count);
        }
      });

      return completer.future.timeout(Duration(seconds: 1),
          onTimeout: () async {
        throw TimeoutException(
            'Failed to wait for updateCount == $count, current == $updateCount',
            Duration(seconds: 1));
      });
    }

    late Client client;
    late Room room;
    late Timeline timeline;
    setUp(() async {
      try {
        await olm.init();
        olm.get_library_version();
      } catch (e) {
        olmEnabled = false;
        Logs().w('[LibOlm] Failed to load LibOlm', e);
      }
      Logs().i('[LibOlm] Enabled: $olmEnabled');
      client = await getClient();
      client.sendMessageTimeoutSeconds = 5;

      final poison = Random().nextInt(2 ^ 32);
      currentPoison = poison;

      room = Room(
          id: roomID, client: client, prev_batch: '1234', roomAccountData: {});
      timeline = Timeline(
        room: room,
        chunk: TimelineChunk(events: []),
        onUpdate: () {
          if (poison != currentPoison) return;
          updateCount++;
          countStream.add(updateCount);
        },
        onInsert: insertList.add,
        onChange: changeList.add,
        onRemove: removeList.add,
      );
      client.rooms.add(room);

      await client.checkHomeserver(Uri.parse('https://fakeserver.notexisting'),
          checkWellKnown: false);
      await client.abortSync();

      updateCount = 0;
      insertList.clear();
      changeList.clear();
      removeList.clear();

      await client.abortSync();
      testTimeStamp = DateTime.now().millisecondsSinceEpoch;
    });

    tearDown(
        () async => client.dispose(closeDatabase: true).onError((e, s) {}));

    test('Create', () async {
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.synced.intValue,
          'event_id': '2',
          'origin_server_ts': testTimeStamp - 1000
        },
      ));
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.synced.intValue,
          'event_id': '\$1',
          'origin_server_ts': testTimeStamp
        },
      ));

      expect(timeline.sub != null, true);

      await waitForCount(2);

      expect(updateCount, 2);
      expect(insertList, [0, 0]);
      expect(insertList.length, timeline.events.length);
      expect(changeList, []);
      expect(removeList, []);
      expect(timeline.events.length, 2);
      expect(timeline.events[0].eventId, '\$1');
      expect(timeline.events[0].senderFromMemoryOrFallback.id,
          '@alice:example.com');
      expect(timeline.events[0].originServerTs.millisecondsSinceEpoch,
          testTimeStamp);
      expect(timeline.events[0].body, 'Testcase');
      expect(
          timeline.events[0].originServerTs.millisecondsSinceEpoch >
              timeline.events[1].originServerTs.millisecondsSinceEpoch,
          true);
      expect(timeline.events[0].receipts, []);

      await client.handleSync(SyncUpdate(
          nextBatch: 'something',
          rooms: RoomsUpdate(join: {
            timeline.room.id: JoinedRoomUpdate(ephemeral: [
              BasicRoomEvent.fromJson({
                'type': 'm.receipt',
                'content': {
                  timeline.events.first.eventId: {
                    'm.read': {
                      '@alice:example.com': {
                        'ts': 1436451550453,
                      }
                    },
                  },
                },
              })
            ])
          })));

      await Future.delayed(Duration(milliseconds: 50));

      expect(timeline.events[0].receipts.length, 1);
      expect(timeline.events[0].receipts[0].user.id, '@alice:example.com');

      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.redaction',
          'content': {'reason': 'spamming'},
          'sender': '@alice:example.com',
          'redacts': '2',
          'event_id': '3',
          'origin_server_ts': testTimeStamp + 1000
        },
      ));

      await waitForCount(3);

      expect(updateCount, 3);
      expect(insertList, [0, 0, 0]);
      expect(insertList.length, timeline.events.length);
      expect(changeList, [2]);
      expect(removeList, []);
      expect(timeline.events.length, 3);
      expect(timeline.events[2].redacted, true);
    });

    test('Receipt updates', () async {
      await client.handleSync(SyncUpdate(
          nextBatch: 'something',
          rooms: RoomsUpdate(join: {
            timeline.room.id: JoinedRoomUpdate(
                timeline: TimelineUpdate(events: [
              MatrixEvent.fromJson({
                'type': 'm.room.message',
                'content': {'msgtype': 'm.text', 'body': 'Testcase'},
                'sender': '@alice:example.com',
                'status': EventStatus.synced.intValue,
                'event_id': '\$2',
                'origin_server_ts': testTimeStamp - 1000,
              }),
              MatrixEvent.fromJson({
                'type': 'm.room.message',
                'content': {'msgtype': 'm.text', 'body': 'Testcase'},
                'sender': '@alice:example.com',
                'status': EventStatus.synced.intValue,
                'event_id': '\$1',
                'origin_server_ts': testTimeStamp,
              }),
              MatrixEvent.fromJson({
                'type': 'm.room.message',
                'content': {'msgtype': 'm.text', 'body': 'Testcase'},
                'sender': '@bob:example.com',
                'status': EventStatus.synced.intValue,
                'event_id': '\$0',
                'origin_server_ts': testTimeStamp + 50,
              }),
            ]))
          })));

      expect(timeline.sub != null, true);

      await waitForCount(3);

      expect(updateCount, 3);
      expect(insertList, [0, 0, 0]);
      expect(insertList.length, timeline.events.length);
      expect(timeline.events[1].senderFromMemoryOrFallback.id,
          '@alice:example.com');
      expect(
          timeline.events[0].senderFromMemoryOrFallback.id, '@bob:example.com');
      expect(timeline.events[0].receipts, []);
      expect(timeline.events[1].receipts, []);
      expect(timeline.events[2].receipts, []);

      await client.handleSync(SyncUpdate(
          nextBatch: 'something',
          rooms: RoomsUpdate(join: {
            timeline.room.id: JoinedRoomUpdate(ephemeral: [
              BasicRoomEvent.fromJson({
                'type': 'm.receipt',
                'content': {
                  '\$2': {
                    'm.read': {
                      '@alice:example.com': {
                        'ts': 1436451550453,
                      }
                    },
                  },
                },
              })
            ])
          })));

      expect(room.receiptState.global.latestOwnReceipt?.eventId, null);
      expect(room.receiptState.global.otherUsers['@alice:example.com']?.eventId,
          '\$2');
      expect(timeline.events[2].receipts.length, 1);
      expect(timeline.events[2].receipts[0].user.id, '@alice:example.com');

      await client.handleSync(SyncUpdate(
          nextBatch: 'something2',
          rooms: RoomsUpdate(join: {
            timeline.room.id: JoinedRoomUpdate(ephemeral: [
              BasicRoomEvent.fromJson({
                'type': 'm.receipt',
                'content': {
                  '\$2': {
                    'm.read': {
                      client.userID: {
                        'ts': 1436451550453,
                      },
                      '@bob:example.com': {
                        'ts': 1436451550453,
                      },
                    },
                  },
                },
              })
            ])
          })));

      expect(room.receiptState.global.latestOwnReceipt?.eventId, '\$2');
      expect(room.receiptState.global.ownPublic?.eventId, '\$2');
      expect(room.receiptState.global.ownPrivate?.eventId, null);
      expect(room.receiptState.global.otherUsers['@alice:example.com']?.eventId,
          '\$2');
      expect(room.receiptState.global.otherUsers['@bob:example.com']?.eventId,
          '\$2');
      expect(timeline.events[2].receipts.length, 3);
      expect(timeline.events[2].receipts[0].user.id, '@alice:example.com');

      await client.handleSync(SyncUpdate(
          nextBatch: 'something3',
          rooms: RoomsUpdate(join: {
            timeline.room.id: JoinedRoomUpdate(ephemeral: [
              BasicRoomEvent.fromJson({
                'type': 'm.receipt',
                'content': {
                  '\$2': {
                    'm.read.private': {
                      client.userID: {
                        'ts': 1436451550453,
                      },
                      '@alice:example.com': {
                        'ts': 1436451550453,
                      },
                    },
                    'm.read': {
                      '@bob:example.com': {
                        'ts': 1436451550453,
                        'thread_id': '\$734'
                      },
                    },
                  },
                },
              })
            ])
          })));

      expect(room.receiptState.global.latestOwnReceipt?.eventId, '\$2');
      expect(room.receiptState.global.ownPublic?.eventId, '\$2');
      expect(room.receiptState.global.ownPrivate?.eventId, '\$2');
      expect(room.receiptState.global.otherUsers['@alice:example.com']?.eventId,
          '\$2');
      expect(room.receiptState.global.otherUsers['@bob:example.com']?.eventId,
          '\$2');
      expect(room.receiptState.byThread.length, 1);
      expect(timeline.events[2].receipts.length, 3);
      expect(timeline.events[2].receipts[0].user.id, '@alice:example.com');

      await client.handleSync(SyncUpdate(
          nextBatch: 'something4',
          rooms: RoomsUpdate(join: {
            timeline.room.id: JoinedRoomUpdate(ephemeral: [
              BasicRoomEvent.fromJson({
                'type': 'm.receipt',
                'content': {
                  '\$1': {
                    'm.read.private': {
                      client.userID: {
                        'ts': 1436451550453,
                      },
                      '@bob:example.com': {
                        'ts': 1436451550453,
                      },
                    },
                  },
                },
              })
            ])
          })));

      expect(room.receiptState.global.latestOwnReceipt?.eventId, '\$1');
      expect(room.receiptState.global.ownPublic?.eventId, '\$2');
      expect(room.receiptState.global.ownPrivate?.eventId, '\$1');
      expect(room.receiptState.global.otherUsers['@alice:example.com']?.eventId,
          '\$2');
      expect(room.receiptState.global.otherUsers['@bob:example.com']?.eventId,
          '\$1');
      expect(room.receiptState.byThread.length, 1);
      expect(timeline.events[1].receipts.length, 2);
      expect(timeline.events[1].receipts[0].user.id, '@bob:example.com');
    });

    test('Sending both receipts at the same time sets the latest receipt',
        () async {
      await client.handleSync(SyncUpdate(
          nextBatch: 'something',
          rooms: RoomsUpdate(join: {
            timeline.room.id: JoinedRoomUpdate(
                timeline: TimelineUpdate(events: [
                  MatrixEvent.fromJson({
                    'type': 'm.room.message',
                    'content': {'msgtype': 'm.text', 'body': 'Testcase'},
                    'sender': '@alice:example.com',
                    'status': EventStatus.synced.intValue,
                    'event_id': '\$2',
                    'origin_server_ts': testTimeStamp - 1000,
                  }),
                ]),
                ephemeral: [
                  BasicRoomEvent.fromJson({
                    'type': 'm.receipt',
                    'content': {
                      '\$2': {
                        'm.read': {
                          client.userID: {
                            'ts': 1436451550453,
                          },
                        },
                        'm.read.private': {
                          client.userID: {
                            'ts': 1436451550453,
                          },
                        },
                      },
                    },
                  })
                ])
          })));

      expect(timeline.sub != null, true);

      await waitForCount(1);

      expect(room.receiptState.global.latestOwnReceipt?.eventId, '\$2');
      expect(room.receiptState.global.ownPublic?.eventId, '\$2');
      expect(room.receiptState.global.ownPrivate?.eventId, '\$2');
    });

    test('Send message', () async {
      await room.sendTextEvent('test', txid: '1234');

      await waitForCount(2);
      expect(updateCount, 2);
      expect(insertList, [0]);
      expect(insertList.length, timeline.events.length);
      final eventId = timeline.events[0].eventId;
      expect(eventId.startsWith('\$event'), true);
      expect(timeline.events[0].status, EventStatus.sent);

      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'test'},
          'sender': '@alice:example.com',
          'status': EventStatus.synced.intValue,
          'event_id': eventId,
          'unsigned': {'transaction_id': '1234'},
          'origin_server_ts': DateTime.now().millisecondsSinceEpoch
        },
      ));

      await waitForCount(3);
      expect(updateCount, 3);
      expect(insertList, [0]);
      expect(insertList.length, timeline.events.length);
      expect(timeline.events[0].eventId, eventId);
      expect(timeline.events[0].status, EventStatus.synced);
    });

    test('Send message with error', () async {
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {
            'msgtype': 'm.text',
            'body': 'Testcase should not show up in Sync'
          },
          'sender': '@alice:example.com',
          'status': EventStatus.sending.intValue,
          'event_id': 'abc',
          'origin_server_ts': testTimeStamp
        },
      ));
      await waitForCount(1);

      await room.sendTextEvent('test', txid: 'errortxid');
      await waitForCount(3);

      await room.sendTextEvent('test', txid: 'errortxid2');
      await waitForCount(5);
      await room.sendTextEvent('test', txid: 'errortxid3');
      await waitForCount(7);

      expect(updateCount, 7);
      expect(insertList, [0, 0, 1, 2]);
      expect(insertList.length, timeline.events.length);
      expect(changeList, [0, 1, 2]);
      expect(removeList, []);
      expect(timeline.events[0].status, EventStatus.error);
      expect(timeline.events[1].status, EventStatus.error);
      expect(timeline.events[2].status, EventStatus.error);
    });

    test('Remove message', () async {
      // send a failed message
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.sending.intValue,
          'event_id': 'abc',
          'origin_server_ts': testTimeStamp
        },
      ));
      await waitForCount(1);

      await timeline.events[0].remove();

      await waitForCount(2);

      expect(insertList, [0]);
      expect(changeList, []);
      expect(removeList, [0]);
      expect(timeline.events.length, 0);
    });

    test('getEventById', () async {
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.sending.intValue,
          'event_id': 'abc',
          'origin_server_ts': testTimeStamp
        },
      ));
      await waitForCount(1);
      var event = await timeline.getEventById('abc');
      expect(event?.content, {'msgtype': 'm.text', 'body': 'Testcase'});

      event = await timeline.getEventById('not_found');
      expect(event, null);

      event = await timeline.getEventById('unencrypted_event');
      expect(event?.body, 'This is an example text message');

      if (olmEnabled) {
        event = await timeline.getEventById('encrypted_event');
        // the event is invalid but should have traces of attempting to decrypt
        expect(event?.messageType, MessageTypes.BadEncrypted);
      }
    });

    test('Resend message', () async {
      timeline.events.clear();
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.error.intValue,
          'event_id': 'new-test-event',
          'origin_server_ts': testTimeStamp,
          'unsigned': {'transaction_id': 'newresend'},
        },
      ));
      await waitForCount(1);
      expect(timeline.events[0].status, EventStatus.error);
      await timeline.events[0].sendAgain();

      await waitForCount(3);

      expect(updateCount, 3);

      expect(insertList, [0]);
      expect(changeList, [0, 0]);
      expect(removeList, []);
      expect(timeline.events.length, 1);
      expect(timeline.events[0].status, EventStatus.sent);
    });

    test('Request history', () async {
      timeline.events.clear();
      expect(timeline.canRequestHistory, true);
      await room.requestHistory();

      await waitForCount(3);

      expect(updateCount, 3);
      expect(insertList, [0, 1, 2]);
      expect(timeline.events.length, 3);
      expect(timeline.events[0].eventId, '3143273582443PhrSn:example.org');
      expect(timeline.events[1].eventId, '2143273582443PhrSn:example.org');
      expect(timeline.events[2].eventId, '1143273582443PhrSn:example.org');
      expect(room.prev_batch, 't47409-4357353_219380_26003_2265');
      await timeline.events[2].redactEvent(reason: 'test', txid: '1234');
    });

    test('Clear cache on limited timeline', () async {
      client.onSync.add(
        SyncUpdate(
          nextBatch: '1234',
          rooms: RoomsUpdate(
            join: {
              roomID: JoinedRoomUpdate(
                timeline: TimelineUpdate(
                  limited: true,
                  prevBatch: 'blah',
                ),
                unreadNotifications: UnreadNotificationCounts(
                  highlightCount: 0,
                  notificationCount: 0,
                ),
              ),
            },
          ),
        ),
      );
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events.isEmpty, true);
    });

    test('sort errors on top', () async {
      timeline.events.clear();
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.error.intValue,
          'event_id': 'abc',
          'origin_server_ts': testTimeStamp
        },
      ));
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.synced.intValue,
          'event_id': 'def',
          'origin_server_ts': testTimeStamp + 5
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.error);
      expect(timeline.events[1].status, EventStatus.synced);
    });

    test('sending event to failed update', () async {
      timeline.events.clear();
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.sending.intValue,
          'event_id': 'will-fail',
          'origin_server_ts': DateTime.now().millisecondsSinceEpoch,
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.sending);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.error.intValue,
          'event_id': 'will-fail',
          'origin_server_ts': testTimeStamp
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.error);
      expect(timeline.events.length, 1);
    });
    test('setReadMarker', () async {
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.synced.intValue,
          'event_id': 'will-work',
          'origin_server_ts': DateTime.now().millisecondsSinceEpoch,
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      room.notificationCount = 1;
      await timeline.setReadMarker();
      //expect(room.notificationCount, 0);
    });
    test('sending an event and the http request finishes first, 0 -> 1 -> 2',
        () async {
      timeline.events.clear();
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.sending.intValue,
          'event_id': 'transaction',
          'origin_server_ts': DateTime.now().millisecondsSinceEpoch,
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.sending);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.sent.intValue,
          'event_id': '\$event',
          'origin_server_ts': testTimeStamp,
          'unsigned': {'transaction_id': 'transaction'}
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.sent);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.synced.intValue,
          'event_id': '\$event',
          'origin_server_ts': testTimeStamp,
          'unsigned': {'transaction_id': 'transaction'}
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.synced);
      expect(timeline.events.length, 1);
    });
    test('sending an event where the sync reply arrives first, 0 -> 2 -> 1',
        () async {
      timeline.events.clear();
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'event_id': 'transaction',
          'origin_server_ts': DateTime.now().millisecondsSinceEpoch,
          'unsigned': {
            messageSendingStatusKey: EventStatus.sending.intValue,
            'transaction_id': 'transaction',
          },
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.sending);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'event_id': '\$event',
          'origin_server_ts': testTimeStamp,
          'unsigned': {
            'transaction_id': 'transaction',
            messageSendingStatusKey: EventStatus.synced.intValue,
          },
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.synced);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'event_id': '\$event',
          'origin_server_ts': testTimeStamp,
          'unsigned': {
            'transaction_id': 'transaction',
            messageSendingStatusKey: EventStatus.sent.intValue,
          },
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.synced);
      expect(timeline.events.length, 1);
    });
    test('sending an event 0 -> -1 -> 2', () async {
      timeline.events.clear();
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.sending.intValue,
          'event_id': 'transaction',
          'origin_server_ts': DateTime.now().millisecondsSinceEpoch,
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.sending);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.error.intValue,
          'origin_server_ts': testTimeStamp,
          'unsigned': {'transaction_id': 'transaction'},
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.error);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.synced.intValue,
          'event_id': '\$event',
          'origin_server_ts': testTimeStamp,
          'unsigned': {'transaction_id': 'transaction'},
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.synced);
      expect(timeline.events.length, 1);
    });
    test('sending an event 0 -> 2 -> -1', () async {
      timeline.events.clear();
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.sending.intValue,
          'event_id': 'transaction',
          'origin_server_ts': DateTime.now().millisecondsSinceEpoch,
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.sending);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.synced.intValue,
          'event_id': '\$event',
          'origin_server_ts': testTimeStamp,
          'unsigned': {'transaction_id': 'transaction'},
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.synced);
      expect(timeline.events.length, 1);
      client.onEvent.add(EventUpdate(
        type: EventUpdateType.timeline,
        roomID: roomID,
        content: {
          'type': 'm.room.message',
          'content': {'msgtype': 'm.text', 'body': 'Testcase'},
          'sender': '@alice:example.com',
          'status': EventStatus.error.intValue,
          'origin_server_ts': testTimeStamp,
          'unsigned': {'transaction_id': 'transaction'},
        },
      ));
      await Future.delayed(Duration(milliseconds: 50));
      expect(timeline.events[0].status, EventStatus.synced);
      expect(timeline.events.length, 1);
    });
    test('logout', () async {
      await client.logout();
    });
  });
}