wake-alarm/phone_app/lib/screens/github_mirror_screen.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:github_device_auth/github_device_auth.dart';
import 'package:wake_alarm_sync/services/sync_settings.dart';
import 'package:wake_alarm_sync/ui/cues.dart';

/// The GitHub mirror screen: cutover-only sync transport, not a peer of
/// Firebase.
///
/// Kept app-local rather than folded into the shared `sync_settings_ui`
/// package since that package carries no GitHub surface at all. Logic moved
/// verbatim from the old combined settings screen.
class GitHubMirrorScreen extends StatefulWidget {
  /// Creates a [GitHubMirrorScreen].
  const GitHubMirrorScreen({super.key});

  @override
  State<GitHubMirrorScreen> createState() => _GitHubMirrorScreenState();
}

class _GitHubMirrorScreenState extends State<GitHubMirrorScreen> {
  SyncSettings _settings = const SyncSettings(token: '');
  bool _busy = false;
  String _status = '';

  @override
  void initState() {
    super.initState();
    unawaited(_load());
  }

  Future<void> _load() async {
    final s = await SyncSettings.load();
    if (!mounted) return;
    setState(() => _settings = s);
  }

  Future<void> _connectGitHub() async {
    final auth = GitHubDeviceAuth(clientId: SyncSettings.defaultClientId);
    try {
      final device = await auth.requestDeviceCode();
      if (!mounted) return;
      final token = await showDialog<String>(
        context: context,
        barrierDismissible: false,
        builder: (_) => DeviceCodeDialog(device: device, auth: auth),
      );
      if (token == null || token.isEmpty) return;

      setState(() {
        _busy = true;
        _status = 'Connecting…';
      });
      final updated = SyncSettings(token: token);
      await updated.save();
      if (mounted) {
        setState(() {
          _settings = updated;
          _busy = false;
          _status = 'Connected! Alarm will sync to kuhyx/syncs.';
        });
      }
    } on Exception catch (e) {
      if (mounted) {
        setState(() {
          _busy = false;
          _status = 'Error: $e';
        });
      }
    } finally {
      auth.close();
    }
  }

  Future<void> _disconnect() async {
    await SyncSettings.clear();
    if (mounted) {
      setState(() {
        _settings = const SyncSettings(token: '');
        _status = 'Disconnected.';
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    final isConnected = _settings.isConfigured;
    return Scaffold(
      appBar: AppBar(),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Icon(
                isConnected ? Icons.link : Icons.link_off,
                color: isConnected
                    ? Theme.of(context).colorScheme.tertiary
                    : Theme.of(context).colorScheme.onSurfaceVariant,
                size: 32,
                semanticLabel: isConnected
                    ? 'Connected to GitHub.'
                    : 'Not connected to GitHub.',
              ),
              const SizedBox(height: 12),
              if (!isConnected)
                ElevatedButton(
                  key: const ValueKey<String>('github-connect'),
                  onPressed: _busy ? null : _connectGitHub,
                  child: const Icon(
                    Icons.link,
                    semanticLabel: 'Connect GitHub',
                  ),
                )
              else
                OutlinedButton(
                  key: const ValueKey<String>('github-disconnect'),
                  onPressed: _busy ? null : _disconnect,
                  child: const Icon(
                    Icons.link_off,
                    semanticLabel: 'Disconnect GitHub',
                  ),
                ),
              const SizedBox(height: 16),
              StatusCue(semanticLabel: _status),
            ],
          ),
        ),
      ),
    );
  }
}