import 'dart:async';
import 'dart:io';
import 'dart:ui' as ui;

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:provider/provider.dart';
import 'package:wakelock/wakelock.dart';
import 'package:flutter_custom_cursor/flutter_custom_cursor.dart';

import '../../consts.dart';
import '../widgets/remote_menubar.dart';
import '../../common.dart';
import '../../mobile/widgets/dialog.dart';
import '../../models/model.dart';
import '../../models/platform_model.dart';
import '../../common/shared_state.dart';

bool _isCustomCursorInited = false;

class RemotePage extends StatefulWidget {
  const RemotePage({
    Key? key,
    required this.id,
    required this.tabBarHeight,
  }) : super(key: key);

  final String id;
  final double tabBarHeight;

  @override
  State<RemotePage> createState() => _RemotePageState();
}

class _RemotePageState extends State<RemotePage>
    with AutomaticKeepAliveClientMixin {
  Timer? _timer;
  String keyboardMode = "legacy";
  final _cursorOverImage = false.obs;
  late RxBool _showRemoteCursor;
  late RxBool _remoteCursorMoved;
  late RxBool _keyboardEnabled;

  final FocusNode _rawKeyFocusNode = FocusNode();
  var _isPhysicalMouse = false;
  var _imageFocused = false;

  Function(bool)? _onEnterOrLeaveImage4Menubar;

  late FFI _ffi;

  void _updateTabBarHeight() {
    _ffi.canvasModel.tabBarHeight = widget.tabBarHeight;
  }

  void _initStates(String id) {
    PrivacyModeState.init(id);
    BlockInputState.init(id);
    CurrentDisplayState.init(id);
    KeyboardEnabledState.init(id);
    ShowRemoteCursorState.init(id);
    RemoteCursorMovedState.init(id);
    _showRemoteCursor = ShowRemoteCursorState.find(id);
    _keyboardEnabled = KeyboardEnabledState.find(id);
    _remoteCursorMoved = RemoteCursorMovedState.find(id);
  }

  void _removeStates(String id) {
    PrivacyModeState.delete(id);
    BlockInputState.delete(id);
    CurrentDisplayState.delete(id);
    ShowRemoteCursorState.delete(id);
    KeyboardEnabledState.delete(id);
    RemoteCursorMovedState.delete(id);
  }

  @override
  void initState() {
    super.initState();
    _initStates(widget.id);
    _ffi = FFI();
    _updateTabBarHeight();
    Get.put(_ffi, tag: widget.id);
    _ffi.connect(widget.id, tabBarHeight: super.widget.tabBarHeight);
    WidgetsBinding.instance.addPostFrameCallback((_) {
      SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: []);
      _ffi.dialogManager
          .showLoading(translate('Connecting...'), onCancel: closeConnection);
    });
    if (!Platform.isLinux) {
      Wakelock.enable();
    }
    _rawKeyFocusNode.requestFocus();
    _ffi.ffiModel.updateEventListener(widget.id);
    _ffi.qualityMonitorModel.checkShowQualityMonitor(widget.id);
    _showRemoteCursor.value = bind.sessionGetToggleOptionSync(
        id: widget.id, arg: 'show-remote-cursor');

    if (!_isCustomCursorInited) {
      customCursorController.registerNeedUpdateCursorCallback(
          (String? lastKey, String? currentKey) async {
        return lastKey == null || lastKey != currentKey;
      });
      _isCustomCursorInited = true;
    }
  }

  @override
  void dispose() {
    debugPrint("REMOTE PAGE dispose ${widget.id}");
    _ffi.dialogManager.hideMobileActionsOverlay();
    _rawKeyFocusNode.dispose();
    _ffi.close();
    _timer?.cancel();
    _ffi.dialogManager.dismissAll();
    SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual,
        overlays: SystemUiOverlay.values);
    if (!Platform.isLinux) {
      Wakelock.disable();
    }
    Get.delete<FFI>(tag: widget.id);
    super.dispose();
    _removeStates(widget.id);
  }

  void resetTool() {
    _ffi.resetModifiers();
  }

  void sendRawKey(RawKeyEvent e, {bool? down, bool? press}) {
    // for maximum compatibility
    final label = logicalKeyMap[e.logicalKey.keyId] ??
        physicalKeyMap[e.physicalKey.usbHidUsage] ??
        e.logicalKey.keyLabel;
    _ffi.inputKey(label, down: down, press: press ?? false);
  }

  Widget buildBody(BuildContext context) {
    return Scaffold(
        backgroundColor: MyTheme.color(context).bg,
        body: Overlay(
          initialEntries: [
            OverlayEntry(builder: (context) {
              _ffi.chatModel.setOverlayState(Overlay.of(context));
              _ffi.dialogManager.setOverlayState(Overlay.of(context));
              return Container(
                  color: Colors.black,
                  child: getRawPointerAndKeyBody(getBodyForDesktop(context)));
            })
          ],
        ));
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    _updateTabBarHeight();
    return WillPopScope(
        onWillPop: () async {
          clientClose(_ffi.dialogManager);
          return false;
        },
        child: MultiProvider(providers: [
          ChangeNotifierProvider.value(value: _ffi.ffiModel),
          ChangeNotifierProvider.value(value: _ffi.imageModel),
          ChangeNotifierProvider.value(value: _ffi.cursorModel),
          ChangeNotifierProvider.value(value: _ffi.canvasModel),
        ], child: buildBody(context)));
  }

  KeyEventResult handleRawKeyEvent(FocusNode data, RawKeyEvent e) {
    bind.sessionGetKeyboardName(id: widget.id).then((result) {
      setState(() {
        keyboardMode = result.toString();
      });
    });

    if (keyboardMode == 'map') {
      mapKeyboardMode(e);
    } else if (keyboardMode == 'translate') {
      legacyKeyboardMode(e);
    } else {
      legacyKeyboardMode(e);
    }

    return KeyEventResult.handled;
  }

  void mapKeyboardMode(RawKeyEvent e) {
    int scanCode;
    int keyCode;
    bool down;

    if (e.data is RawKeyEventDataMacOs) {
      RawKeyEventDataMacOs newData = e.data as RawKeyEventDataMacOs;
      scanCode = newData.keyCode;
      keyCode = newData.keyCode;
    } else if (e.data is RawKeyEventDataWindows) {
      RawKeyEventDataWindows newData = e.data as RawKeyEventDataWindows;
      scanCode = newData.scanCode;
      keyCode = newData.keyCode;
    } else if (e.data is RawKeyEventDataLinux) {
      RawKeyEventDataLinux newData = e.data as RawKeyEventDataLinux;
      scanCode = newData.scanCode;
      keyCode = newData.keyCode;
    } else {
      scanCode = -1;
      keyCode = -1;
    }

    if (e is RawKeyDownEvent) {
      down = true;
    } else {
      down = false;
    }

    _ffi.inputRawKey(e.character ?? "", keyCode, scanCode, down);
  }

  void legacyKeyboardMode(RawKeyEvent e) {
    final key = e.logicalKey;
    if (e is RawKeyDownEvent) {
      if (e.repeat) {
        sendRawKey(e, press: true);
      } else {
        if (e.isAltPressed && !_ffi.alt) {
          _ffi.alt = true;
        } else if (e.isControlPressed && !_ffi.ctrl) {
          _ffi.ctrl = true;
        } else if (e.isShiftPressed && !_ffi.shift) {
          _ffi.shift = true;
        } else if (e.isMetaPressed && !_ffi.command) {
          _ffi.command = true;
        }
        sendRawKey(e, down: true);
      }
    }
    if (e is RawKeyUpEvent) {
      if (key == LogicalKeyboardKey.altLeft ||
          key == LogicalKeyboardKey.altRight) {
        _ffi.alt = false;
      } else if (key == LogicalKeyboardKey.controlLeft ||
          key == LogicalKeyboardKey.controlRight) {
        _ffi.ctrl = false;
      } else if (key == LogicalKeyboardKey.shiftRight ||
          key == LogicalKeyboardKey.shiftLeft) {
        _ffi.shift = false;
      } else if (key == LogicalKeyboardKey.metaLeft ||
          key == LogicalKeyboardKey.metaRight ||
          key == LogicalKeyboardKey.superKey) {
        _ffi.command = false;
      }
      sendRawKey(e);
    }
  }

  Widget getRawPointerAndKeyBody(Widget child) {
    return FocusScope(
        autofocus: true,
        child: Focus(
            autofocus: true,
            canRequestFocus: true,
            focusNode: _rawKeyFocusNode,
            onFocusChange: (bool v) {
              _imageFocused = v;
            },
            onKey: handleRawKeyEvent,
            child: child));
  }

  void _onPointHoverImage(PointerHoverEvent e) {
    if (e.kind != ui.PointerDeviceKind.mouse) return;
    if (!_isPhysicalMouse) {
      setState(() {
        _isPhysicalMouse = true;
      });
    }
    if (_isPhysicalMouse) {
      _ffi.handleMouse(getEvent(e, 'mousemove'),
          tabBarHeight: widget.tabBarHeight);
    }
  }

  void _onPointDownImage(PointerDownEvent e) {
    if (e.kind != ui.PointerDeviceKind.mouse) {
      if (_isPhysicalMouse) {
        setState(() {
          _isPhysicalMouse = false;
        });
      }
    }
    if (_isPhysicalMouse) {
      _ffi.handleMouse(getEvent(e, 'mousedown'),
          tabBarHeight: widget.tabBarHeight);
    }
  }

  void _onPointUpImage(PointerUpEvent e) {
    if (e.kind != ui.PointerDeviceKind.mouse) return;
    if (_isPhysicalMouse) {
      _ffi.handleMouse(getEvent(e, 'mouseup'),
          tabBarHeight: widget.tabBarHeight);
    }
  }

  void _onPointMoveImage(PointerMoveEvent e) {
    if (e.kind != ui.PointerDeviceKind.mouse) return;
    if (_isPhysicalMouse) {
      _ffi.handleMouse(getEvent(e, 'mousemove'),
          tabBarHeight: widget.tabBarHeight);
    }
  }

  void _onPointerSignalImage(PointerSignalEvent e) {
    if (e is PointerScrollEvent) {
      var dx = e.scrollDelta.dx.toInt();
      var dy = e.scrollDelta.dy.toInt();
      if (dx > 0) {
        dx = -1;
      } else if (dx < 0) {
        dx = 1;
      }
      if (dy > 0) {
        dy = -1;
      } else if (dy < 0) {
        dy = 1;
      }
      bind.sessionSendMouse(
          id: widget.id, msg: '{"type": "wheel", "x": "$dx", "y": "$dy"}');
    }
  }

  void enterView(PointerEnterEvent evt) {
    if (!_imageFocused) {
      _rawKeyFocusNode.requestFocus();
    }
    _cursorOverImage.value = true;
    if (_onEnterOrLeaveImage4Menubar != null) {
      try {
        _onEnterOrLeaveImage4Menubar!(true);
      } catch (e) {
        //
      }
    }
    _ffi.enterOrLeave(true);
  }

  void leaveView(PointerExitEvent evt) {
    _cursorOverImage.value = false;
    if (_onEnterOrLeaveImage4Menubar != null) {
      try {
        _onEnterOrLeaveImage4Menubar!(false);
      } catch (e) {
        //
      }
    }
    _ffi.enterOrLeave(false);
  }

  Widget _buildImageListener(Widget child) {
    return Listener(
        onPointerHover: _onPointHoverImage,
        onPointerDown: _onPointDownImage,
        onPointerUp: _onPointUpImage,
        onPointerMove: _onPointMoveImage,
        onPointerSignal: _onPointerSignalImage,
        child:
            MouseRegion(onEnter: enterView, onExit: leaveView, child: child));
  }

  Widget getBodyForDesktop(BuildContext context) {
    var paints = <Widget>[
      MouseRegion(onEnter: (evt) {
        bind.hostStopSystemKeyPropagate(stopped: false);
      }, onExit: (evt) {
        bind.hostStopSystemKeyPropagate(stopped: true);
      }, child: LayoutBuilder(builder: (context, constraints) {
        Future.delayed(Duration.zero, () {
          Provider.of<CanvasModel>(context, listen: false).updateViewStyle();
        });
        return ImagePaint(
          id: widget.id,
          cursorOverImage: _cursorOverImage,
          keyboardEnabled: _keyboardEnabled,
          remoteCursorMoved: _remoteCursorMoved,
          listenerBuilder: _buildImageListener,
        );
      }))
    ];

    paints.add(Obx(() => Visibility(
        visible: _showRemoteCursor.isTrue && _remoteCursorMoved.isTrue,
        child: CursorPaint(
          id: widget.id,
        ))));
    paints.add(QualityMonitor(_ffi.qualityMonitorModel));
    paints.add(RemoteMenubar(
      id: widget.id,
      ffi: _ffi,
      onEnterOrLeaveImageSetter: (func) => _onEnterOrLeaveImage4Menubar = func,
      onEnterOrLeaveImageCleaner: () => _onEnterOrLeaveImage4Menubar = null,
    ));
    return Stack(
      children: paints,
    );
  }

  int lastMouseDownButtons = 0;

  Map<String, dynamic> getEvent(PointerEvent evt, String type) {
    final Map<String, dynamic> out = {};
    out['type'] = type;
    out['x'] = evt.position.dx;
    out['y'] = evt.position.dy;
    if (_ffi.alt) out['alt'] = 'true';
    if (_ffi.shift) out['shift'] = 'true';
    if (_ffi.ctrl) out['ctrl'] = 'true';
    if (_ffi.command) out['command'] = 'true';
    out['buttons'] = evt
        .buttons; // left button: 1, right button: 2, middle button: 4, 1 | 2 = 3 (left + right)
    if (evt.buttons != 0) {
      lastMouseDownButtons = evt.buttons;
    } else {
      out['buttons'] = lastMouseDownButtons;
    }
    return out;
  }

  @override
  bool get wantKeepAlive => true;
}

class ImagePaint extends StatelessWidget {
  final String id;
  final Rx<bool> cursorOverImage;
  final Rx<bool> keyboardEnabled;
  final Rx<bool> remoteCursorMoved;
  final Widget Function(Widget)? listenerBuilder;
  final ScrollController _horizontal = ScrollController();
  final ScrollController _vertical = ScrollController();

  ImagePaint(
      {Key? key,
      required this.id,
      required this.cursorOverImage,
      required this.keyboardEnabled,
      required this.remoteCursorMoved,
      this.listenerBuilder})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    final m = Provider.of<ImageModel>(context);
    var c = Provider.of<CanvasModel>(context);
    final s = c.scale;

    mouseRegion({child}) => Obx(() => MouseRegion(
        cursor: (cursorOverImage.isTrue && keyboardEnabled.isTrue)
            ? (remoteCursorMoved.isTrue
                ? SystemMouseCursors.none
                : _buildCustomCursorLinux(context, s))
            : MouseCursor.defer,
        onHover: (evt) {},
        child: child));

    if (c.scrollStyle == ScrollStyle.scrollbar) {
      final imageWidget = SizedBox(
          width: c.getDisplayWidth() * s,
          height: c.getDisplayHeight() * s,
          child: CustomPaint(
            painter: ImagePainter(image: m.image, x: 0, y: 0, scale: s),
          ));

      return Center(
        child: NotificationListener<ScrollNotification>(
          onNotification: (notification) {
            final percentX = _horizontal.position.extentBefore /
                (_horizontal.position.extentBefore +
                    _horizontal.position.extentInside +
                    _horizontal.position.extentAfter);
            final percentY = _vertical.position.extentBefore /
                (_vertical.position.extentBefore +
                    _vertical.position.extentInside +
                    _vertical.position.extentAfter);
            c.setScrollPercent(percentX, percentY);
            return false;
          },
          child: mouseRegion(
              child: _buildCrossScrollbar(_buildListener(imageWidget))),
        ),
      );
    } else {
      final imageWidget = SizedBox(
          width: c.size.width,
          height: c.size.height,
          child: CustomPaint(
            painter:
                ImagePainter(image: m.image, x: c.x / s, y: c.y / s, scale: s),
          ));
      return mouseRegion(child: _buildListener(imageWidget));
    }
  }

  MouseCursor _buildCustomCursorLinux(BuildContext context, double scale) {
    final cursor = Provider.of<CursorModel>(context);
    final cacheLinux = cursor.cacheLinux;
    if (cacheLinux == null) {
      return MouseCursor.defer;
    } else {
      final key = cacheLinux.key(scale);
      cursor.addKeyLinux(key);
      return FlutterCustomMemoryImageCursor(
        pixbuf: cacheLinux.data,
        key: key,
        hotx: cacheLinux.hotx,
        hoty: cacheLinux.hoty,
        imageWidth: (cacheLinux.width * scale).toInt(),
        imageHeight: (cacheLinux.height * scale).toInt(),
      );
    }
  }

  Widget _buildCrossScrollbar(Widget child) {
    final physicsVertical =
        cursorOverImage.value ? const NeverScrollableScrollPhysics() : null;
    final physicsHorizontal =
        cursorOverImage.value ? const NeverScrollableScrollPhysics() : null;
    return Scrollbar(
        controller: _vertical,
        thumbVisibility: false,
        trackVisibility: false,
        child: Scrollbar(
          controller: _horizontal,
          thumbVisibility: false,
          trackVisibility: false,
          notificationPredicate: (notif) => notif.depth == 1,
          child: SingleChildScrollView(
            controller: _vertical,
            physics: physicsVertical,
            child: SingleChildScrollView(
              controller: _horizontal,
              scrollDirection: Axis.horizontal,
              physics: physicsHorizontal,
              child: child,
            ),
          ),
        ));
  }

  Widget _buildListener(Widget child) {
    if (listenerBuilder != null) {
      return listenerBuilder!(child);
    } else {
      return child;
    }
  }
}

class CursorPaint extends StatelessWidget {
  final String id;

  const CursorPaint({Key? key, required this.id}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final m = Provider.of<CursorModel>(context);
    final c = Provider.of<CanvasModel>(context);
    // final adjust = m.adjustForKeyboard();
    return CustomPaint(
      painter: ImagePainter(
          image: m.image,
          x: m.x - m.hotx + c.x / c.scale,
          y: m.y - m.hoty + c.y / c.scale,
          scale: c.scale),
    );
  }
}

class ImagePainter extends CustomPainter {
  ImagePainter({
    required this.image,
    required this.x,
    required this.y,
    required this.scale,
  });

  ui.Image? image;
  double x;
  double y;
  double scale;

  @override
  void paint(Canvas canvas, Size size) {
    if (image == null) return;
    if (x.isNaN || y.isNaN) return;
    canvas.scale(scale, scale);
    // https://github.com/flutter/flutter/issues/76187#issuecomment-784628161
    // https://api.flutter-io.cn/flutter/dart-ui/FilterQuality.html
    var paint = Paint();
    paint.filterQuality = FilterQuality.medium;
    if (scale > 10.00000) {
      paint.filterQuality = FilterQuality.high;
    }
    canvas.drawImage(image!, Offset(x, y), paint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return oldDelegate != this;
  }
}

class QualityMonitor extends StatelessWidget {
  final QualityMonitorModel qualityMonitorModel;
  QualityMonitor(this.qualityMonitorModel);

  @override
  Widget build(BuildContext context) => ChangeNotifierProvider.value(
      value: qualityMonitorModel,
      child: Consumer<QualityMonitorModel>(
          builder: (context, qualityMonitorModel, child) => Positioned(
              top: 10,
              right: 10,
              child: qualityMonitorModel.show
                  ? Container(
                      padding: const EdgeInsets.all(8),
                      color: MyTheme.canvasColor.withAlpha(120),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            "Speed: ${qualityMonitorModel.data.speed ?? ''}",
                            style: const TextStyle(color: MyTheme.grayBg),
                          ),
                          Text(
                            "FPS: ${qualityMonitorModel.data.fps ?? ''}",
                            style: const TextStyle(color: MyTheme.grayBg),
                          ),
                          Text(
                            "Delay: ${qualityMonitorModel.data.delay ?? ''} ms",
                            style: const TextStyle(color: MyTheme.grayBg),
                          ),
                          Text(
                            "Target Bitrate: ${qualityMonitorModel.data.targetBitrate ?? ''}kb",
                            style: const TextStyle(color: MyTheme.grayBg),
                          ),
                          Text(
                            "Codec: ${qualityMonitorModel.data.codecFormat ?? ''}",
                            style: const TextStyle(color: MyTheme.grayBg),
                          ),
                        ],
                      ),
                    )
                  : const SizedBox.shrink())));
}