import 'dart:async';
import 'dart:io';

import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
import 'package:matrix/matrix.dart';
import 'package:sqflite_common_ffi/sqflite_ffi.dart';
import 'package:webrtc_interface/webrtc_interface.dart';

// Gemeinsame Hilfen für Live-Tests mit zwei Testkonten (Anruftest,
// UI-Tour): zweiter Matrix-Client im selben Prozess, Zugangsdaten,
// Warte-Helfer. Kein eigenständiger Test.

/// Zweiter Teilnehmer: eigener Matrix-Client + VoIP im selben Prozess.
class TestPartner {
  TestPartner(this.client, this.delegate, this.voip, this.zone) {
    _sub = client.onCallEvents.stream.listen((events) {
      for (final e in events) {
        if (e.type != EventTypes.CallCandidates || e.senderId == client.userID) {
          continue;
        }
        final list = e.content.tryGetList<Map<String, dynamic>>('candidates');
        if (list != null) _buffer.addAll(list);
      }
    });
    _timer = Timer.periodic(const Duration(milliseconds: 500), (_) async {
      final pc = delegate.call?.pc;
      if (!fixCandidates || pc == null) return;
      try {
        if (await pc.getRemoteDescription() == null) return;
        for (final c in List.of(_buffer)) {
          final cand = c['candidate'] as String?;
          if (cand == null || !_applied.add(cand)) continue;
          await pc.addCandidate(RTCIceCandidate(
            cand,
            c['sdpMid']?.toString() ?? '',
            (c['sdpMLineIndex'] as num?)?.round() ?? 0,
          ));
        }
      } catch (_) {}
    });
  }
  final Client client;
  final TestPartnerDelegate delegate;
  final VoIP voip;
  final Zone zone;

  /// Aktion der Gegenseite in ihrer Zone ausführen (Fehler über Completer).
  Future<T> run<T>(Future<T> Function() f) {
    final done = Completer<T>();
    zone.run(() async {
      try {
        done.complete(await f());
      } catch (e, s) {
        done.completeError(e, s);
      }
    });
    return done.future;
  }

  /// Gegenseite reicht Kandidaten nach wie die gepatchte App.
  bool fixCandidates = false;
  final _buffer = <Map<String, dynamic>>[];
  final _applied = <String>{};
  StreamSubscription? _sub;
  Timer? _timer;

  static Future<TestPartner> start(String user, String pass) async {
    final db = await databaseFactoryFfi.openDatabase(inMemoryDatabasePath);
    final client = Client(
      'pyramid-call-partner',
      database: await MatrixSdkDatabase.init('pyramid-call-partner', database: db),
    );
    await client.init(waitForFirstSync: false, waitUntilLoadCompletedLoaded: false);
    await client.checkHomeserver(Uri.parse('https://steggi-matrix.work'));
    await client.login(
      LoginType.mLoginPassword,
      identifier: AuthenticationUserIdentifier(user: user),
      password: pass,
      initialDeviceDisplayName: 'Pyramid-Anruftest (kurzlebig)',
    );
    final delegate = TestPartnerDelegate();
    // Eigene Zone: Fehler der Gegenseite sichtbar protokollieren statt sie
    // im Testrahmen zu verlieren.
    final zone = Zone.current.fork(
      specification: ZoneSpecification(
        handleUncaughtError: (self, parent, z, e, s) =>
            logStep('Gegenseite (abgefangen): ${e.toString().split('\n').first}'),
      ),
    );
    final voip = zone.run(() => VoIP(client, delegate));
    return TestPartner(client, delegate, voip, zone);
  }

  Future<void> dispose(String? roomId) async {
    _timer?.cancel();
    await _sub?.cancel();
    try {
      await delegate.call?.hangup(reason: CallErrorCode.userHangup);
    } catch (_) {}
    if (roomId != null) {
      try {
        await client.leaveRoom(roomId);
        await client.forgetRoom(roomId);
      } catch (_) {}
    }
    try {
      client.backgroundSync = false;
      await client.logout();
    } catch (_) {}
  }
}

class TestPartnerDelegate implements WebRTCDelegate {
  CallSession? call;

  @override
  MediaDevices get mediaDevices => TestPartnerMedia(rtc.navigator.mediaDevices);

  @override
  Future<RTCPeerConnection> createPeerConnection(
    Map<String, dynamic> configuration, [
    Map<String, dynamic> constraints = const {},
  ]) =>
      rtc.createPeerConnection(configuration, constraints);

  @override
  Future<void> handleNewCall(CallSession session) async {
    call = session;
    if (session.direction == CallDirection.kIncoming) {
      // Wie ein Mensch nach kurzem Klingeln annehmen. Sofortiges Annehmen
      // trifft eine Lücke im SDK: Kandidaten, die WÄHREND answer()
      // eintreffen, landen in einer Warteschlange, die nie mehr abgearbeitet
      // wird (CallSession.onCandidatesReceived vs. answer()).
      unawaited(Future.delayed(const Duration(seconds: 2), () async {
        try {
          await session.answer();
        } catch (e) {
          logStep('Gegenseite: Annehmen fehlgeschlagen: $e');
        }
      }));
    }
  }

  @override
  Future<void> handleCallEnded(CallSession session) async {}
  @override
  Future<void> handleMissedCall(CallSession session) async {}
  @override
  Future<void> handleNewGroupCall(GroupCallSession groupCall) async {}
  @override
  Future<void> handleGroupCallEnded(GroupCallSession groupCall) async {}
  @override
  Future<void> playRingtone() async {}
  @override
  Future<void> stopRingtone() async {}
  @override
  Future<void> registerListeners(CallSession session) async {}
  @override
  bool get isWeb => false;
  @override
  bool get canHandleNewCall => true;
  @override
  EncryptionKeyProvider? get keyProvider => null;
}

/// Wie die App am PC: Bildschirm über eine Desktop-Quelle (erster Monitor).
class TestPartnerMedia extends MediaDevices {
  TestPartnerMedia(this._d);
  final MediaDevices _d;

  @override
  Future<MediaStream> getUserMedia(Map<String, dynamic> c) => _d.getUserMedia(c);

  @override
  Future<MediaStream> getDisplayMedia(Map<String, dynamic> c) async {
    final sources = await rtc.desktopCapturer
        .getSources(types: [rtc.SourceType.Screen]);
    return _d.getDisplayMedia({
      'video': {
        'mandatory': {
          'chromeMediaSource': 'desktop',
          'chromeMediaSourceId': sources.first.id,
        },
        'optional': [],
      },
      'audio': false,
    });
  }

  @override
  Future<List<MediaDeviceInfo>> enumerateDevices() => _d.enumerateDevices();
  @override
  MediaTrackSupportedConstraints getSupportedConstraints() =>
      _d.getSupportedConstraints();
  @override
  set ondevicechange(Function(dynamic event)? callback) =>
      _d.ondevicechange = callback;
  @override
  Function(dynamic event)? get ondevicechange => _d.ondevicechange;
  @override
  // ignore: deprecated_member_use
  Future<List<dynamic>> getSources() => _d.getSources();
  @override
  Future<MediaDeviceInfo> selectAudioOutput([AudioOutputOptions? options]) =>
      _d.selectAudioOutput(options);
}

Map<String, String>? loadTestAccounts() {
  final home = Platform.environment['USERPROFILE'] ?? '';
  final file = File('$home\\.pyramid-autopilot\\test-accounts.txt');
  if (!file.existsSync()) return null;
  final map = <String, String>{};
  for (final line in file.readAsLinesSync()) {
    final t = line.trim();
    if (t.isEmpty || t.startsWith('#')) continue;
    final i = t.indexOf('=');
    if (i > 0) map[t.substring(0, i)] = t.substring(i + 1);
  }
  return map;
}

Future<void> pumpFor(WidgetTester tester, Duration d) async {
  final end = DateTime.now().add(d);
  while (DateTime.now().isBefore(end)) {
    await tester.pump(const Duration(milliseconds: 100));
  }
}

void logStep(String m) {
  // ignore: avoid_print
  print('SCHRITT ${DateTime.now().toIso8601String().substring(11, 19)} $m');
}

Future<void> pumpUntil(
  WidgetTester tester,
  bool Function() condition, {
  Duration timeout = const Duration(seconds: 60),
  String what = '',
  void Function()? onTimeout,
  void Function()? every5s,
}) async {
  final end = DateTime.now().add(timeout);
  var next = DateTime.now().add(const Duration(seconds: 5));
  while (DateTime.now().isBefore(end)) {
    await tester.pump(const Duration(milliseconds: 200));
    if (condition()) return;
    if (every5s != null && DateTime.now().isAfter(next)) {
      every5s();
      next = DateTime.now().add(const Duration(seconds: 5));
    }
  }
  logStep('ZEITÜBERSCHREITUNG: $what');
  onTimeout?.call();
  fail('Zeitüberschreitung: $what');
}