import 'package:flutter/material.dart';
import 'package:stream_chat_flutter/stream_chat_flutter.dart';

/// Fourth step of the [tutorial](https://getstream.io/chat/flutter/tutorial/)
///
/// Stream Chat supports message threads out of the box. Threads allows users to create sub-conversations inside the same channel.
///
/// Using threaded conversations is very simple and mostly a matter of plugging the [MessageListView] to another widget that renders the widget.
/// To make this simple, such a widget only needs to build [MessageListView] with the parent attribute set to the thread’s root message.
///
/// Now we can open threads and create new ones as well, if you long press a message you can tap on Reply and it will open the same [ThreadPage].
void main() async {
  final client = Client(
    'b67pax5b2wdq',
    logLevel: Level.INFO,
  );

  await client.setUser(
    User(id: 'falling-mountain-7'),
    'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoiZmFsbGluZy1tb3VudGFpbi03In0.AKgRXHMQQMz6vJAKszXdY8zMFfsAgkoUeZHlI-Szz9E',
  );

  runApp(MyApp(client));
}

class MyApp extends StatelessWidget {
  final Client client;

  MyApp(this.client);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Container(
        child: StreamChat(
          client: client,
          child: ChannelListPage(),
        ),
      ),
    );
  }
}

class ChannelListPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ChannelListView(
        filter: {
          'members': {
            '\$in': [StreamChat.of(context).user.id],
          }
        },
        sort: [SortOption('last_message_at')],
        pagination: PaginationParams(
          limit: 20,
        ),
        channelWidget: ChannelPage(),
      ),
    );
  }
}

class ChannelPage extends StatelessWidget {
  const ChannelPage({
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: ChannelHeader(),
      body: Column(
        children: <Widget>[
          Expanded(
            child: MessageListView(
              threadBuilder: (_, parentMessage) {
                return ThreadPage(
                  parent: parentMessage,
                );
              },
            ),
          ),
          MessageInput(),
        ],
      ),
    );
  }
}

class ThreadPage extends StatelessWidget {
  final Message parent;

  ThreadPage({
    Key key,
    this.parent,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: ThreadHeader(
        parent: parent,
      ),
      body: Column(
        children: <Widget>[
          Expanded(
            child: MessageListView(
              parentMessage: parent,
            ),
          ),
          MessageInput(
            parentMessage: parent,
          ),
        ],
      ),
    );
  }
}
