// SPDX-FileCopyrightText: 2019-Present Christian Kußowski
// SPDX-FileCopyrightText: 2019-Present Contributors to FluffyChat
//
// SPDX-License-Identifier: AGPL-3.0-or-later

import 'package:material_ui/material_ui.dart';
import 'package:matrix/matrix.dart';
import 'package:tatchat/l10n/l10n.dart';
import 'package:tatchat/pages/chat_list/chat_list.dart';
import 'package:tatchat/pages/chat_list/chat_list_item.dart';
import 'package:tatchat/pages/chat_list/tabs/empty_tab_view.dart';
import 'package:tatchat/utils/stream_extension.dart';
import 'package:tatchat/widgets/matrix.dart';

class ChannelsTab extends StatelessWidget {
  final ChatListController controller;

  const ChannelsTab(this.controller, {super.key});

  @override
  Widget build(BuildContext context) {
    final client = Matrix.of(context).client;
    final theme = Theme.of(context);
    return StreamBuilder(
      key: ValueKey(client.userID.toString()),
      stream: client.onSync.stream
          .where((s) => s.hasRoomUpdate)
          .rateLimit(const Duration(seconds: 1)),
      builder: (context, _) {
        final channels = client.rooms
            .where((room) => !room.isSpace && !room.isDirectChat)
            .toList();
        return CustomScrollView(
          slivers: [
            SliverToBoxAdapter(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: Row(
                  children: [
                    Icon(
                      Icons.tag_outlined,
                      color: theme.colorScheme.primary,
                    ),
                    const SizedBox(width: 8),
                    Text(
                      L10n.of(context).channels,
                      style: theme.textTheme.titleLarge,
                    ),
                  ],
                ),
              ),
            ),
            if (channels.isEmpty)
              SliverFillRemaining(
                hasScrollBody: false,
                child: EmptyTabView(
                  icon: Icons.tag_outlined,
                  title: L10n.of(context).noChannelsFound,
                ),
              )
            else
              SliverList.builder(
                itemCount: channels.length,
                itemBuilder: (context, i) {
                  final room = channels[i];
                  return ChatListItem(
                    room,
                    key: Key('channel_list_item_${room.id}'),
                    onTap: () => controller.onChatTap(room),
                    activeChat: controller.activeChat == room.id,
                  );
                },
              ),
          ],
        );
      },
    );
  }
}