openharness

import 'dart:async';

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

import '../shared/theme/app_theme.dart' as grid;
import '../core/pull_request_status.dart';

/// A separate PR label: branch colour does not encode review state.
class PullRequestBadge extends StatefulWidget {
  const PullRequestBadge({
    super.key,
    required this.identity,
    required this.read,
    this.open,
    this.compact = false,
  });
  final Object identity;
  final bool compact;
  final Future<Map<String, dynamic>> Function() read;
  final Future<bool> Function(Uri)? open;
  @override
  State<PullRequestBadge> createState() => _PullRequestBadgeState();
}

class _PullRequestBadgeState extends State<PullRequestBadge> {
  Timer? _timer;
  int _revision = 0;
  Map<String, dynamic>? _result;
  @override
  void initState() {
    super.initState();
    _restart();
  }

  @override
  void didUpdateWidget(PullRequestBadge oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.identity != widget.identity) _restart();
  }

  void _restart() {
    _timer?.cancel();
    _result = null;
    final revision = ++_revision;
    unawaited(_refresh(revision));
  }

  Future<void> _refresh(int revision) async {
    Map<String, dynamic> result;
    try {
      result = await widget.read();
    } catch (_) {
      result = {'status': 'unavailable'};
    }
    if (!mounted || revision != _revision) return;
    setState(() => _result = result);
    _timer = Timer(const Duration(seconds: 60), () => _refresh(revision));
  }

  @override
  void dispose() {
    _revision++;
    _timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    grid.AppTheme.watch(context);
    final pr = PullRequestStatus.fromResult(_result);
    if (pr == null) return const SizedBox.shrink();
    final number = pr.number, state = pr.state, uri = pr.url;
    final label = pr.label;
    return Tooltip(
      message: '#$number $state — Open on GitHub',
      child: TextButton(
        style: TextButton.styleFrom(
          minimumSize: const Size(0, 28),
          padding: const EdgeInsets.symmetric(horizontal: 6),
          textStyle: grid.AppType.monoLabel(),
        ),
        onPressed: () async {
          final opened =
              await (widget.open?.call(uri) ??
                  launchUrl(uri, mode: LaunchMode.externalApplication));
          if (!opened && context.mounted) {
            ScaffoldMessenger.maybeOf(context)?.showSnackBar(
              const SnackBar(content: Text('Could not open GitHub.')),
            );
          }
        },
        child: Text(label, maxLines: 1, overflow: TextOverflow.ellipsis),
      ),
    );
  }
}