frosty/lib/widgets/stream_sort_button.dart

import 'package:flutter/material.dart';
import 'package:frosty/apis/twitch_gql_api.dart';

/// Toggles viewer-count sort between descending (default) and ascending.
class StreamSortButton extends StatelessWidget {
  final StreamViewerSort sortOrder;
  final ValueChanged<StreamViewerSort> onChanged;

  const StreamSortButton({
    super.key,
    required this.sortOrder,
    required this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    final isAsc = sortOrder == StreamViewerSort.viewersAsc;

    return PopupMenuButton<StreamViewerSort>(
      tooltip: 'Sort by viewers',
      icon: Icon(
        isAsc ? Icons.arrow_upward_rounded : Icons.arrow_downward_rounded,
      ),
      initialValue: sortOrder,
      onSelected: onChanged,
      itemBuilder: (context) => [
        const PopupMenuItem(
          value: StreamViewerSort.viewersDesc,
          child: Text('Most viewers'),
        ),
        const PopupMenuItem(
          value: StreamViewerSort.viewersAsc,
          child: Text('Fewest viewers'),
        ),
      ],
    );
  }
}