import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_background_service/flutter_background_service.dart';
import 'enrollment_db.dart';
import 'filter_proxy.dart';
import 'proxy_service.dart';
import 'session_manager.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ProxyService.initialize();
  runApp(const KPhoneApp());
}

class KPhoneApp extends StatelessWidget {
  const KPhoneApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'k_phone',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.indigo),
        useMaterial3: true,
      ),
      home: const ProxyStatusScreen(),
    );
  }
}

class ProxyStatusScreen extends StatefulWidget {
  const ProxyStatusScreen({super.key});

  @override
  State<ProxyStatusScreen> createState() => _ProxyStatusScreenState();
}

class _ProxyStatusScreenState extends State<ProxyStatusScreen> {
  bool _serviceRunning = false;
  bool _cardAttached = false;
  String _statusMessage = 'Stopped';
  final List<String> _log = [];
  // Debug-only test state — stripped in release builds via kDebugMode.
  bool _testRunning = false;
  final _db = EnrollmentDb();
  final _session = SessionManager();

  @override
  void initState() {
    super.initState();
    _subscribeToService();
  }

  void _subscribeToService() {
    final service = FlutterBackgroundService();

    // Sync initial running state
    service.isRunning().then((running) {
      if (mounted) setState(() => _serviceRunning = running);
    });

    service.on('status').listen((event) {
      if (event == null) return;
      if (mounted) {
        setState(() {
          _serviceRunning = event['running'] as bool? ?? false;
          _cardAttached = event['cardAttached'] as bool? ?? false;
          _statusMessage = event['message'] as String? ?? '';
          final log = event['log'] as String?;
          if (log != null) {
            _log.insert(0, log);
            if (_log.length > 200) _log.removeLast();
          }
        });
      }
    });
  }

  void _addLog(String msg) {
    setState(() {
      _log.insert(0, msg);
      if (_log.length > 200) _log.removeLast();
    });
  }

  Future<void> _runRegistrationLoginTest() async {
    if (_testRunning) return;
    setState(() => _testRunning = true);

    try {
      // --- Registrering ---
      _addLog('[REGISTRATION] Starter: enrolling "testbruger"');
      try {
        final enrollment = await _db.register(
          username: 'testbruger',
          displayName: 'Test Bruger',
        );
        _addLog('[REGISTRATION] OK: bruger="${enrollment.username}" '
            'displayName="${enrollment.displayName}"');
      } on StateError {
        _addLog('[REGISTRATION] INFO: "testbruger" allerede enrollet — sletter og prøver igen');
        await _db.delete('testbruger');
        final enrollment = await _db.register(
          username: 'testbruger',
          displayName: 'Test Bruger',
        );
        _addLog('[REGISTRATION] OK: bruger="${enrollment.username}" genregistreret');
      }

      final list = await _db.list();
      _addLog('[REGISTRATION] Enrollment-liste: ${list.map((e) => e.username).join(', ')}');

      _addLog('[REGISTRATION] Test duplikat afvisning...');
      try {
        await _db.register(username: 'testbruger');
        _addLog('[REGISTRATION] FEJL: duplikat burde være afvist!');
      } on StateError catch (e) {
        _addLog('[REGISTRATION] OK: duplikat afvist — ${e.message}');
      }

      // --- Login ---
      _addLog('[LOGIN] Udsteder session for "testbruger"...');
      final token = _session.issue('testbruger');
      _addLog('[LOGIN] Token: ${token.substring(0, 8)}... (${token.length} tegn)');

      final valid = _session.isValid(token);
      _addLog('[LOGIN] Session gyldig: $valid');

      final entry = _session.getSession(token);
      _addLog('[LOGIN] Udløber: ${entry?.expires.toLocal().toString().substring(0, 19)}');

      _addLog('[LOGIN] Tilbagekalder session...');
      _session.revoke(token);
      _addLog('[LOGIN] Session gyldig efter revoke: ${_session.isValid(token)}');

      _addLog('[LOGIN] FÆRDIG — alle flows OK');
    } catch (e) {
      _addLog('[FEJL] $e');
    } finally {
      setState(() => _testRunning = false);
    }
  }

  Future<void> _toggleService() async {
    final service = FlutterBackgroundService();
    final running = await service.isRunning();
    if (running) {
      service.invoke('stop');
      setState(() {
        _serviceRunning = false;
        _cardAttached = false;
        _statusMessage = 'Stopped';
      });
    } else {
      await service.startService();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('k_phone — ChromeCard proxy'),
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
      ),
      body: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            _StatusTile(
              label: 'Filter proxy (Comp 1)',
              ok: _serviceRunning,
              value: _serviceRunning ? 'Running on :$kFilterProxyPort' : 'Stopped',
            ),
            const SizedBox(height: 8),
            _StatusTile(
              label: 'Auth proxy (Comp 2)',
              ok: _serviceRunning,
              value: _serviceRunning ? 'Running on :$kProxyPort' : 'Stopped',
            ),
            const SizedBox(height: 8),
            _StatusTile(
              label: 'ChromeCard (USB)',
              ok: _cardAttached,
              value: _cardAttached ? 'Attached' : 'Not detected',
            ),
            const SizedBox(height: 8),
            Text(
              _statusMessage,
              style: Theme.of(context).textTheme.bodySmall,
            ),
            const SizedBox(height: 16),
            Row(
              children: [
                FilledButton(
                  onPressed: _toggleService,
                  child: Text(_serviceRunning ? 'Stop proxy' : 'Start proxy'),
                ),
                if (kDebugMode) ...[
                  const SizedBox(width: 12),
                  FilledButton.tonal(
                    onPressed: _testRunning ? null : _runRegistrationLoginTest,
                    child: _testRunning
                        ? const SizedBox(
                            width: 16,
                            height: 16,
                            child: CircularProgressIndicator(strokeWidth: 2),
                          )
                        : const Text('Kør registrering & login'),
                  ),
                ],
              ],
            ),
            const Divider(height: 32),
            const Text('Log', style: TextStyle(fontWeight: FontWeight.bold)),
            Expanded(
              child: ListView.builder(
                itemCount: _log.length,
                itemBuilder: (_, i) => Text(
                  _log[i],
                  style: const TextStyle(fontSize: 11, fontFamily: 'monospace'),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class _StatusTile extends StatelessWidget {
  final String label;
  final bool ok;
  final String value;

  const _StatusTile({
    required this.label,
    required this.ok,
    required this.value,
  });

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Icon(
          ok ? Icons.check_circle : Icons.radio_button_unchecked,
          color: ok ? Colors.green : Colors.grey,
          size: 18,
        ),
        const SizedBox(width: 8),
        Text('$label: ', style: const TextStyle(fontWeight: FontWeight.w600)),
        Text(value),
      ],
    );
  }
}