/*
 *   Famedly
 *   Copyright (C) 2019, 2020, 2021 Famedly GmbH
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero General Public License as
 *   published by the Free Software Foundation, either version 3 of the
 *   License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU Affero General Public License for more details.
 *
 *   You should have received a copy of the GNU Affero General Public License
 *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

import 'dart:async' hide StreamView;
import 'dart:math';

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

import 'package:flutter_foreground_task/flutter_foreground_task.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart';
import 'package:just_audio/just_audio.dart';
import 'package:matrix/matrix.dart';
import 'package:universal_html/html.dart' as darthtml;
import 'package:vibration/vibration.dart';
import 'package:wakelock/wakelock.dart';

import 'package:fluffychat/pages/voip/dialer/pip/pip_view.dart';
import 'package:fluffychat/pages/voip/group_call_view.dart';
import 'package:fluffychat/pages/voip/utils/call_session_state.dart';
import 'package:fluffychat/pages/voip/utils/call_state_proxy.dart';
import 'package:fluffychat/pages/voip/utils/group_call_session_state.dart';
import 'package:fluffychat/pages/voip/utils/stream_view.dart';
import 'package:fluffychat/pages/voip/utils/voip_plugin.dart';
import 'package:fluffychat/utils/platform_infos.dart';
import 'package:fluffychat/widgets/avatar.dart';

class Calling extends StatefulWidget {
  final VoipPlugin voipPlugin;
  final VoidCallback onClear;

  const Calling({Key? key, required this.voipPlugin, required this.onClear})
      : super(key: key);

  @override
  MyCallingPage createState() => MyCallingPage();
}

class MyCallingPage extends State<Calling> {
  late CallStateProxy? proxy;
  late Room room;

  String get displayName => proxy?.displayName ?? '';

  MediaStream? get localStream {
    if (proxy != null && proxy!.localUserMediaStream != null) {
      return proxy!.localUserMediaStream!.stream!;
    }
    return null;
  }

  bool get isMicrophoneMuted => proxy?.isMicrophoneMuted ?? false;
  bool get isLocalVideoMuted => proxy?.isLocalVideoMuted ?? false;
  bool get isScreensharingEnabled => proxy?.isScreensharingEnabled ?? false;
  bool get isRemoteOnHold => proxy?.isRemoteOnHold ?? false;
  bool get voiceonly => proxy?.voiceonly ?? false;
  bool get connecting => proxy?.connecting ?? false;
  bool get connected => proxy?.connected ?? false;
  bool get ended => proxy?.ended ?? true;
  bool get callOnHold => proxy?.callOnHold ?? false;
  bool get isGroupCall => (proxy != null && proxy! is GroupCallSessionState);
  bool get showMicMuteButton => connected;
  bool get showScreenSharingButton => connected;
  bool get showHoldButton => connected && !isGroupCall;
  WrappedMediaStream get screenSharing => screenSharingStreams.elementAt(0);
  WrappedMediaStream? get primaryStream => proxy?.primaryStream;

  bool get showAnswerButton =>
      (!connected && !connecting && !ended) &&
      !(proxy?.isOutgoing ?? false) &&
      !isGroupCall;
  bool get showVideoMuteButton =>
      proxy != null &&
      (proxy?.localUserMediaStream?.stream?.getVideoTracks().isNotEmpty ??
          false) &&
      connected;

  List<WrappedMediaStream> get screenSharingStreams =>
      (proxy?.screenSharingStreams ?? []);

  List<WrappedMediaStream> get userMediaStreams {
    if (isGroupCall) {
      return (proxy?.userMediaStreams ?? []);
    }
    final streams = <WrappedMediaStream>[
      ...proxy?.screenSharingStreams ?? [],
      ...proxy?.userMediaStreams ?? []
    ];
    streams
        .removeWhere((s) => s.stream?.id == proxy?.primaryStream?.stream?.id);
    return streams;
  }

  String get title {
    if (isGroupCall) {
      return 'Group call';
    }
    return '${voiceonly ? 'Voice Call' : 'Video Call'} (${proxy?.callState ?? 'Could not detect call state'})';
  }

  String get heldTitle {
    var heldTitle = '';
    if (proxy?.localHold ?? false) {
      heldTitle = '${proxy?.displayName ?? ''} held the call.';
    } else if (proxy?.remoteOnHold ?? false) {
      heldTitle = 'You held the call.';
    }
    return heldTitle;
  }

  // bool get speakerOn => call?.speakerOn ?? false;

  // bool get mirrored => call?.facingMode == 'user';

  VoipPlugin get voipPlugin => widget.voipPlugin;

  double? _localVideoHeight;
  double? _localVideoWidth;
  EdgeInsetsGeometry? _localVideoMargin;

  void _playCallSound() async {
    const path = 'assets/sounds/call.wav';
    if (kIsWeb) {
      darthtml.AudioElement()
        ..src = 'assets/$path'
        ..autoplay = true
        ..load();
    } else if (PlatformInfos.isMobile) {
      final callSoundPlayer = AudioPlayer();
      await callSoundPlayer.setAsset(path);
      callSoundPlayer.play();
    } else {
      Logs().w('Playing sound not implemented for this platform!');
    }
  }

  @override
  void initState() {
    super.initState();
    initialize();
    _playCallSound();
  }

  void initialize() async {
    if (voipPlugin.currentGroupCall != null) {
      room = voipPlugin.currentGroupCall!.room;
      proxy = GroupCallSessionState(voipPlugin.currentGroupCall!);
    } else if (voipPlugin.currentCall != null) {
      room = voipPlugin.currentCall!.room;
      proxy = CallSessionState(voipPlugin.currentCall!);
    } else {
      throw Exception('No call or group call found');
    }

    proxy!.onStateChanged(_handleCallState);

    if (!proxy!.voiceonly) {
      try {
        // Enable wakelock (keep screen on)
        unawaited(Wakelock.enable());
      } catch (_) {}
    }
  }

  void cleanUp() {
    Timer(
      const Duration(seconds: 2),
      () => widget.onClear.call(),
    );
    if (!proxy!.voiceonly) {
      try {
        unawaited(Wakelock.disable());
      } catch (_) {}
    }
  }

  @override
  void dispose() {
    super.dispose();
    cleanUp();
  }

  void _resizeLocalVideo(Orientation orientation) {
    final shortSide = min(
        MediaQuery.of(context).size.width, MediaQuery.of(context).size.height);
    _localVideoMargin = userMediaStreams.isNotEmpty
        ? const EdgeInsets.only(top: 20.0, right: 20.0)
        : EdgeInsets.zero;
    _localVideoWidth = userMediaStreams.isNotEmpty
        ? shortSide / 3
        : MediaQuery.of(context).size.width;
    _localVideoHeight = userMediaStreams.isNotEmpty
        ? shortSide / 4
        : MediaQuery.of(context).size.height;
  }

  void _handleCallState() {
    Logs().v('CallingPage::handleCallState');
    if ({'connected', 'ended'}.contains(proxy!.callState.toLowerCase())) {
      Vibration.vibrate(duration: 200);
    }

    if (mounted) {
      setState(() {
        if (proxy!.callState.toLowerCase() == 'ended') cleanUp();
      });
    }
  }

  void handleAnswerButtonClick() {
    if (mounted) {
      setState(() {
        proxy?.answer();
      });
    }
  }

  void handleHangupButtonClick() {
    _hangUp();
  }

  void _hangUp() {
    setState(() {
      proxy!.hangup();
    });
  }

  void handleMicMuteButtonClick() {
    setState(() {
      proxy?.setMicrophoneMuted(!isMicrophoneMuted);
    });
  }

  void handleScreenSharingButtonClick() async {
    if (!proxy!.isScreensharingEnabled) {
      await FlutterForegroundTask.init(
        androidNotificationOptions: AndroidNotificationOptions(
          channelId: 'notification_channel_id',
          channelName: 'Foreground Notification',
          channelDescription:
              'This notification appears when the foreground service is running.',
        ),
      );
      FlutterForegroundTask.startService(
        notificationTitle: 'Screen sharing',
        notificationText: 'You are sharing your screen in famedly',
      );
    } else {
      FlutterForegroundTask.stopService();
    }
    setState(() {
      proxy?.setScreensharingEnabled(!isScreensharingEnabled);
    });
  }

  void handleHoldButtonClick() {
    setState(() {
      proxy?.setRemoteOnHold(!isRemoteOnHold);
    });
  }

  void handleVideoMuteButtonClick() {
    setState(() {
      proxy?.setLocalVideoMuted(!isLocalVideoMuted);
    });
  }

  // void _switchCamera() async {
  //   if (call.localUserMediaStream != null) {
  //     await Helper.switchCamera(
  //         call.localUserMediaStream!.stream!.getVideoTracks()[0]);
  //     if (kIsMobile) {
  //       call.facingMode == 'user'
  //           ? call.facingMode = 'environment'
  //           : call.facingMode = 'user';
  //     }
  //   }
  //   setState(() {});
  // }

  /*
  void _switchSpeaker() {
    setState(() {
      session.setSpeakerOn();
    });
  }
  */

  List<Widget> _buildActionButtons(bool isFloating) {
    if (isFloating || proxy == null) {
      return [];
    }

    /*
    var switchSpeakerButton = FloatingActionButton(
      heroTag: 'switchSpeaker',
      child: Icon(_speakerOn ? Icons.volume_up : Icons.volume_off),
      onPressed: _switchSpeaker,
      foregroundColor: Colors.black54,
      backgroundColor: Theme.of(context).backgroundColor,
    );
    */
    return [
      FloatingActionButton(
        heroTag: 'hangup',
        onPressed: handleHangupButtonClick,
        tooltip: 'Hangup',
        backgroundColor: proxy!.callState.toLowerCase() == 'ended'
            ? Colors.black45
            : Colors.red,
        child: const Icon(Icons.call_end),
      ),
      if (showAnswerButton)
        FloatingActionButton(
          heroTag: 'answer',
          onPressed: handleAnswerButtonClick,
          tooltip: 'Answer',
          backgroundColor: Colors.green,
          child: const Icon(Icons.phone),
        ),
      if (showMicMuteButton)
        FloatingActionButton(
          heroTag: 'muteMic',
          onPressed: handleMicMuteButtonClick,
          foregroundColor: isMicrophoneMuted ? Colors.black26 : Colors.white,
          backgroundColor: isMicrophoneMuted ? Colors.white : Colors.black45,
          child: Icon(isMicrophoneMuted ? Icons.mic_off : Icons.mic),
        ),
      if (showScreenSharingButton)
        FloatingActionButton(
          heroTag: 'screenSharing',
          onPressed: handleScreenSharingButtonClick,
          foregroundColor:
              isScreensharingEnabled ? Colors.black26 : Colors.white,
          backgroundColor:
              isScreensharingEnabled ? Colors.white : Colors.black45,
          child: const Icon(Icons.desktop_mac),
        ),
      if (showHoldButton)
        FloatingActionButton(
          heroTag: 'hold',
          onPressed: handleHoldButtonClick,
          foregroundColor: isRemoteOnHold ? Colors.black26 : Colors.white,
          backgroundColor: isRemoteOnHold ? Colors.white : Colors.black45,
          child: const Icon(Icons.pause),
        ),
      // FloatingActionButton(
      //   heroTag: 'switchCamera',
      //   onPressed: _switchCamera,
      //   backgroundColor: Colors.black45,
      //   child: const Icon(Icons.switch_camera),
      // ),
      if (showVideoMuteButton)
        FloatingActionButton(
          heroTag: 'muteCam',
          onPressed: handleVideoMuteButtonClick,
          foregroundColor: isLocalVideoMuted ? Colors.black26 : Colors.white,
          backgroundColor: isLocalVideoMuted ? Colors.white : Colors.black45,
          child: Icon(isLocalVideoMuted ? Icons.videocam_off : Icons.videocam),
        ),
    ];
  }

  List<Widget> _buildP2PView(Orientation orientation, bool isFloating) {
    final stackWidgets = <Widget>[];

    if (proxy == null || proxy!.ended) {
      return stackWidgets;
    }

    if (proxy!.localHold || proxy!.remoteOnHold) {
      var title = '';
      if (proxy!.localHold) {
        title = '${proxy!.displayName} held the call.';
      } else if (proxy!.remoteOnHold) {
        title = 'You held the call.';
      }
      stackWidgets.add(Center(
        child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
          const Icon(
            Icons.pause,
            size: 48.0,
            color: Colors.white,
          ),
          Text(
            title,
            style: const TextStyle(
              color: Colors.white,
              fontSize: 24.0,
            ),
          )
        ]),
      ));
      return stackWidgets;
    }

    if (primaryStream != null) {
      stackWidgets.add(
        Center(
          child: StreamView(
            primaryStream!,
            mainView: true,
            matrixClient: voipPlugin.client,
          ),
        ),
      );
    }

    if (isFloating || !connected) {
      return stackWidgets;
    }

    _resizeLocalVideo(orientation);

    if (userMediaStreams.isEmpty) {
      return stackWidgets;
    }

    final secondaryStreamViews = <Widget>[];

    for (final stream in userMediaStreams) {
      secondaryStreamViews.add(SizedBox(
        width: _localVideoWidth,
        height: _localVideoHeight,
        child: StreamView(
          stream,
          matrixClient: voipPlugin.client,
        ),
      ));
      secondaryStreamViews.add(const SizedBox(height: 10));
    }

    if (secondaryStreamViews.isNotEmpty) {
      stackWidgets.add(Container(
        padding: const EdgeInsets.fromLTRB(0, 20, 0, 120),
        alignment: Alignment.bottomRight,
        child: Container(
          width: _localVideoWidth,
          margin: _localVideoMargin,
          child: Column(
            children: secondaryStreamViews,
          ),
        ),
      ));
    }

    return stackWidgets;
  }

  @override
  Widget build(BuildContext context) {
    return PIPView(builder: (context, isFloating) {
      return Scaffold(
          resizeToAvoidBottomInset: !isFloating,
          floatingActionButtonLocation:
              FloatingActionButtonLocation.centerFloat,
          floatingActionButton: SizedBox(
            width: 320.0,
            height: 150.0,
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,
              children: _buildActionButtons(isFloating).reversed.toList(),
            ),
          ),
          body: OrientationBuilder(
              builder: (BuildContext context, Orientation orientation) {
            return Container(
                decoration: const BoxDecoration(
                  color: Colors.black87,
                ),
                child: Stack(children: [
                  if (isGroupCall)
                    GroupCallView(
                        call: proxy as GroupCallSessionState,
                        client: voipPlugin.client)
                  else
                    ..._buildP2PView(orientation, isFloating),
                  if (!isFloating)
                    Positioned(
                        top: 24.0,
                        left: 24.0,
                        child: IconButton(
                          color: Colors.red,
                          icon: const Icon(Icons.arrow_back),
                          onPressed: () {
                            PIPView.of(context)?.setFloating(true);
                          },
                        ))
                ]));
          }));
    });
  }
}