import 'dart:async';
import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:livekit_client/livekit_client.dart';
import 'package:provider/provider.dart';
import 'package:solian/models/call.dart';
import 'package:solian/providers/auth.dart';
import 'package:solian/router.dart';
import 'package:solian/utils/service_url.dart';
import 'package:solian/widgets/chat/call/controls.dart';
import 'package:solian/widgets/chat/call/exts.dart';
import 'package:solian/widgets/chat/call/participant.dart';
import 'package:solian/widgets/chat/call/participant_menu.dart';
import 'package:solian/widgets/exts.dart';
import 'package:solian/widgets/indent_wrapper.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:wakelock_plus/wakelock_plus.dart';
import 'dart:math' as math;

class ChatCall extends StatefulWidget {
  final Call call;

  const ChatCall({super.key, required this.call});

  @override
  State<ChatCall> createState() => _ChatCallState();
}

class _ChatCallState extends State<ChatCall> {
  String? _token;
  String? _endpoint;

  bool _isMounted = false;

  StreamSubscription? _subscription;
  List<MediaDevice> _audioInputs = [];
  List<MediaDevice> _videoInputs = [];

  bool _enableAudio = true;
  bool _enableVideo = false;
  LocalAudioTrack? _audioTrack;
  LocalVideoTrack? _videoTrack;
  MediaDevice? _videoDevice;
  MediaDevice? _audioDevice;

  final VideoParameters _videoParameters = VideoParametersPresets.h720_169;

  late Room _callRoom;
  late EventsListener<RoomEvent> _callListener;

  List<ParticipantTrack> _participantTracks = [];
  ParticipantTrack? _focusParticipant;

  Future<void> checkPermissions() async {
    if (lkPlatformIs(PlatformType.macOS) || lkPlatformIs(PlatformType.linux)) return;

    await Permission.camera.request();
    await Permission.microphone.request();
    await Permission.bluetooth.request();
    await Permission.bluetoothConnect.request();
  }

  Future<(String, String)> exchangeToken() async {
    await checkPermissions();

    final auth = context.read<AuthProvider>();
    if (!await auth.isAuthorized()) {
      router.pop();
      throw Error();
    }

    var uri = getRequestUri('messaging', '/api/channels/${widget.call.channel.alias}/calls/ongoing/token');

    var res = await auth.client!.post(uri);
    if (res.statusCode == 200) {
      final result = jsonDecode(utf8.decode(res.bodyBytes));
      _token = result['token'];
      _endpoint = 'wss://${result['endpoint']}';
      joinRoom(_endpoint!, _token!);
      return (_token!, _endpoint!);
    } else {
      var message = utf8.decode(res.bodyBytes);
      context.showErrorDialog(message);
      throw Exception(message);
    }
  }

  void joinRoom(String url, String token) async {
    if (_isMounted) {
      return;
    } else {
      _isMounted = true;
    }

    ScaffoldMessenger.of(context).clearSnackBars();

    final notify = ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(AppLocalizations.of(context)!.connectingServer),
        duration: const Duration(minutes: 1),
      ),
    );

    try {
      await _callRoom.connect(
        url,
        token,
        roomOptions: RoomOptions(
          dynacast: true,
          adaptiveStream: true,
          defaultAudioPublishOptions: const AudioPublishOptions(
            name: 'call_voice',
            stream: 'call_stream',
          ),
          defaultVideoPublishOptions: const VideoPublishOptions(
            name: 'call_video',
            stream: 'call_stream',
            simulcast: true,
            backupVideoCodec: BackupVideoCodec(enabled: true),
          ),
          defaultScreenShareCaptureOptions: const ScreenShareCaptureOptions(
            useiOSBroadcastExtension: true,
            params: VideoParameters(
              dimensions: VideoDimensionsPresets.h1080_169,
              encoding: VideoEncoding(maxBitrate: 3 * 1000 * 1000, maxFramerate: 30),
            ),
          ),
          defaultCameraCaptureOptions: CameraCaptureOptions(maxFrameRate: 30, params: _videoParameters),
        ),
        fastConnectOptions: FastConnectOptions(
          microphone: TrackOption(track: _audioTrack),
          camera: TrackOption(track: _videoTrack),
        ),
      );

      setupRoom();
    } catch (e) {
      context.showErrorDialog(e);
    } finally {
      notify.close();
    }
  }

  void autoPublish() async {
    try {
      if (_enableVideo) await _callRoom.localParticipant?.setCameraEnabled(true);
    } catch (error) {
      await context.showErrorDialog(error);
    }
    try {
      if (_enableAudio) await _callRoom.localParticipant?.setMicrophoneEnabled(true);
    } catch (error) {
      await context.showErrorDialog(error);
    }
  }

  void setupRoom() {
    _callRoom.addListener(onRoomDidUpdate);
    setupRoomListeners();
    sortParticipants();
    WidgetsBindingCompatible.instance?.addPostFrameCallback((_) => autoPublish());

    if (lkPlatformIsMobile()) {
      Hardware.instance.setSpeakerphoneOn(true);
    }
  }

  void setupRoomListeners() {
    _callListener
      ..on<RoomDisconnectedEvent>((event) async {
        if (event.reason != null) {
          ScaffoldMessenger.of(context).showSnackBar(SnackBar(
            content: Text('Call disconnected... ${event.reason}'),
          ));
        }
        if (router.canPop()) router.pop();
      })
      ..on<ParticipantEvent>((event) => sortParticipants())
      ..on<LocalTrackPublishedEvent>((_) => sortParticipants())
      ..on<LocalTrackUnpublishedEvent>((_) => sortParticipants())
      ..on<TrackSubscribedEvent>((_) => sortParticipants())
      ..on<TrackUnsubscribedEvent>((_) => sortParticipants())
      ..on<ParticipantNameUpdatedEvent>((event) {
        sortParticipants();
      })
      ..on<AudioPlaybackStatusChanged>((event) async {
        if (!_callRoom.canPlaybackAudio) {
          bool? yesno = await context.showPlayAudioManuallyDialog();
          if (yesno == true) {
            await _callRoom.startAudio();
          }
        }
      });
  }

  void sortParticipants() {
    Map<String, ParticipantTrack> mediaTracks = {};
    for (var participant in _callRoom.remoteParticipants.values) {
      mediaTracks[participant.sid] = ParticipantTrack(
        participant: participant,
        videoTrack: null,
        isScreenShare: false,
      );

      for (var t in participant.videoTrackPublications) {
        mediaTracks[participant.sid]?.videoTrack = t.track;
        mediaTracks[participant.sid]?.isScreenShare = t.isScreenShare;
      }
    }

    final mediaTrackList = mediaTracks.values.toList();
    mediaTrackList.sort((a, b) {
      // Loudest people first
      if (a.participant.isSpeaking && b.participant.isSpeaking) {
        if (a.participant.audioLevel > b.participant.audioLevel) {
          return -1;
        } else {
          return 1;
        }
      }

      // Last spoke first
      final aSpokeAt = a.participant.lastSpokeAt?.millisecondsSinceEpoch ?? 0;
      final bSpokeAt = b.participant.lastSpokeAt?.millisecondsSinceEpoch ?? 0;

      if (aSpokeAt != bSpokeAt) {
        return aSpokeAt > bSpokeAt ? -1 : 1;
      }

      // Has video first
      if (a.participant.hasVideo != b.participant.hasVideo) {
        return a.participant.hasVideo ? -1 : 1;
      }

      // First joined people first
      return a.participant.joinedAt.millisecondsSinceEpoch - b.participant.joinedAt.millisecondsSinceEpoch;
    });

    ParticipantTrack localTrack = ParticipantTrack(
      participant: _callRoom.localParticipant!,
      videoTrack: null,
      isScreenShare: false,
    );
    if (_callRoom.localParticipant != null) {
      final localParticipantTracks = _callRoom.localParticipant?.videoTrackPublications;
      if (localParticipantTracks != null) {
        for (var t in localParticipantTracks) {
          localTrack.videoTrack = t.track;
          localTrack.isScreenShare = t.isScreenShare;
        }
      }
    }

    setState(() {
      _participantTracks = [localTrack, ...mediaTrackList];
      if (_focusParticipant == null) {
        _focusParticipant = _participantTracks.first;
      } else {
        final idx = _participantTracks.indexWhere((x) => _focusParticipant!.participant.sid == x.participant.sid);
        _focusParticipant = _participantTracks[idx];
      }
    });
  }

  void onRoomDidUpdate() => sortParticipants();

  void revertDevices(List<MediaDevice> devices) async {
    _audioInputs = devices.where((d) => d.kind == 'audioinput').toList();
    _videoInputs = devices.where((d) => d.kind == 'videoinput').toList();

    if (_audioInputs.isNotEmpty) {
      if (_audioDevice == null && _enableAudio) {
        _audioDevice = _audioInputs.first;
        Future.delayed(const Duration(milliseconds: 100), () async {
          await changeLocalAudioTrack();
          setState(() {});
        });
      }
    }

    if (_videoInputs.isNotEmpty) {
      if (_videoDevice == null && _enableVideo) {
        _videoDevice = _videoInputs.first;
        Future.delayed(const Duration(milliseconds: 100), () async {
          await changeLocalVideoTrack();
          setState(() {});
        });
      }
    }
    setState(() {});
  }

  Future<void> setEnableVideo(value) async {
    _enableVideo = value;
    if (!_enableVideo) {
      await _videoTrack?.stop();
      _videoTrack = null;
    } else {
      await changeLocalVideoTrack();
    }
    setState(() {});
  }

  Future<void> setEnableAudio(value) async {
    _enableAudio = value;
    if (!_enableAudio) {
      await _audioTrack?.stop();
      _audioTrack = null;
    } else {
      await changeLocalAudioTrack();
    }
    setState(() {});
  }

  Future<void> changeLocalAudioTrack() async {
    if (_audioTrack != null) {
      await _audioTrack!.stop();
      _audioTrack = null;
    }

    if (_audioDevice != null) {
      _audioTrack = await LocalAudioTrack.create(AudioCaptureOptions(
        deviceId: _audioDevice!.deviceId,
      ));
      await _audioTrack!.start();
    }
  }

  Future<void> changeLocalVideoTrack() async {
    if (_videoTrack != null) {
      await _videoTrack!.stop();
      _videoTrack = null;
    }

    if (_videoDevice != null) {
      _videoTrack = await LocalVideoTrack.createCameraTrack(CameraCaptureOptions(
        deviceId: _videoDevice!.deviceId,
        params: _videoParameters,
      ));
      await _videoTrack!.start();
    }
  }

  @override
  void initState() {
    super.initState();
    _subscription = Hardware.instance.onDeviceChange.stream.listen(revertDevices);
    _callRoom = Room();
    _callListener = _callRoom.createListener();
    Hardware.instance.enumerateDevices().then(revertDevices);
    WakelockPlus.enable();
  }

  @override
  Widget build(BuildContext context) {
    return IndentWrapper(
      title: AppLocalizations.of(context)!.chatCall,
      hideDrawer: true,
      child: FutureBuilder(
        future: exchangeToken(),
        builder: (context, snapshot) {
          if (!snapshot.hasData || snapshot.data == null) {
            return const Center(child: CircularProgressIndicator());
          }

          return Stack(
            children: [
              Column(
                children: [
                  Expanded(
                    child: Container(
                      color: Theme.of(context).colorScheme.surfaceVariant,
                      child: _focusParticipant != null
                          ? InteractiveParticipantWidget(
                              participant: _focusParticipant!,
                              onTap: () {},
                            )
                          : Container(),
                    ),
                  ),
                  if (_callRoom.localParticipant != null) ControlsWidget(_callRoom, _callRoom.localParticipant!),
                ],
              ),
              Positioned(
                left: 0,
                right: 0,
                top: 0,
                child: SizedBox(
                  height: 128,
                  child: ListView.builder(
                    scrollDirection: Axis.horizontal,
                    itemCount: math.max(0, _participantTracks.length),
                    itemBuilder: (BuildContext context, int index) {
                      final track = _participantTracks[index];
                      if (track.participant.sid == _focusParticipant?.participant.sid) {
                        return Container();
                      }

                      return Padding(
                        padding: const EdgeInsets.only(top: 8, left: 8),
                        child: ClipRRect(
                          borderRadius: const BorderRadius.all(Radius.circular(8)),
                          child: InteractiveParticipantWidget(
                            width: 120,
                            height: 120,
                            color: Theme.of(context).cardColor,
                            participant: track,
                            onTap: () {
                              if (track.participant.sid != _focusParticipant?.participant.sid) {
                                setState(() => _focusParticipant = track);
                              }
                            },
                          ),
                        ),
                      );
                    },
                  ),
                ),
              ),
            ],
          );
        },
      ),
    );
  }

  @override
  void deactivate() {
    _subscription?.cancel();
    super.deactivate();
  }

  @override
  void dispose() {
    WakelockPlus.disable();
    (() async {
      _callRoom.removeListener(onRoomDidUpdate);
      await _callListener.dispose();
      await _callRoom.disconnect();
      await _callRoom.dispose();
    })();
    super.dispose();
  }
}

class InteractiveParticipantWidget extends StatelessWidget {
  final double? width;
  final double? height;
  final Color? color;
  final bool? isFixed;
  final ParticipantTrack participant;
  final Function() onTap;

  const InteractiveParticipantWidget({
    super.key,
    this.width,
    this.height,
    this.color,
    this.isFixed = false,
    required this.participant,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return InkWell(
      child: Container(
        width: width,
        height: height,
        color: color,
        child: ParticipantWidget.widgetFor(participant, isFixed: true),
      ),
      onTap: () => onTap(),
      onLongPress: () {
        if (participant.participant is LocalParticipant) return;
        showModalBottomSheet(
          context: context,
          builder: (context) => ParticipantMenu(
            participant: participant.participant as RemoteParticipant,
            videoTrack: participant.videoTrack,
            isScreenShare: participant.isScreenShare,
          ),
        );
      },
    );
  }
}