import 'dart:async';
import 'dart:math';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:trackoffical_app/logger.dart';
import 'package:trackoffical_app/model/game_map.dart';
import 'package:trackoffical_app/service/app.dart';
import 'package:trackoffical_app/service/game/game_model.dart';
import 'package:vibration/vibration.dart';
import '../../model/map_mode.dart';
import '../../widget/matrix_gesture_detector.dart';
import 'package:vector_math/vector_math_64.dart' as vec;

class MapStatus {

  var canVibrate = false;
  var mapImageData = Uint8List(0).obs;
  var gameMapData = GameMap();
  final GameModel _model = Get.find();
  Rx<Matrix4> get matrix => _model.mapTransformMatrix;
  Rx<MapMode> get mapMode => _model.mapMode;
  double get compassAngle => _model.compassRadiansFused.value;
  var lastCompassRadians = 0.0;
  var vibrateAccumulation = 0.0;
  var isTouching = false;
  double picFirstScale = 1;
  var isSetBeginMatrix = false;
  final isShowMapScale = false.obs;
  Timer? _showMapScaleTimer;
  double _mapLenMeter=1;

  // 比例尺  屏幕尺寸/米 实时
  final mapScale = 0.0.obs;
  // 比例尺  屏幕尺寸/米 原始
  var mapScaleSrc = 0.0;


  double get rotateRadian {
    final ogRm = matrix.value.clone();
    double radian = MatrixGestureDetector.decomposeToValues(ogRm).rotation;
    return radian;
  }
  double get compassPlantRadian =>_model.compassPlantRadian;

  final _translationUpdater = _ValueUpdater<Offset>(
    onUpdate: (oldVal, newVal) => newVal - (oldVal ?? Offset.zero),
  );
  final _rotationUpdater = _ValueUpdater<double>(
    onUpdate: (oldVal, newVal) => newVal - (oldVal ?? 0),
  );
  final _scaleUpdater = _ValueUpdater<double>(
    onUpdate: (oldVal, newVal) => newVal / (oldVal ?? 1),
  );

  Future<void> resetMatrix() async{
    matrix.value = Matrix4.identity();
    lastCompassRadians = 0.0;
    _rotationUpdater.value = 0;
    _translationUpdater.value = Offset.zero;
    _scaleUpdater.value = 1;


    isSetBeginMatrix=false;

    matrix.value = _doScale(4, matrix.value);

    const p0Src = Offset(0, 0);
    final p1Src = Offset(gameMapData.width, 0);
    final mapTopLeftLocation = await gameMapData.pixelToWorld(p0Src);
    final mapTopRightLocation = await gameMapData.pixelToWorld(p1Src);
    final disKm = mapTopLeftLocation.distance(mapTopRightLocation);
    _mapLenMeter = disKm.km;
    final screenLen = App.to.screenSize.width;
    mapScaleSrc = screenLen / _mapLenMeter;

    calculateMapScale();

  }


  Offset picOffsetToScreen(Offset offset){
    var thisOffset = Offset(offset.dx * picFirstScale, offset.dy * picFirstScale);
    final mr= matrix.value.applyToVector3Array([thisOffset.dx, thisOffset.dy, 0]);
    return Offset(mr[0], mr[1]);
  }

  void movePicPointTo(Offset src, Offset dst){
    final pOnScreen = picOffsetToScreen(src);
    final dis = dst - pOnScreen;
    final tranM = Matrix4.translationValues(dis.dx, dis.dy, 0);
    matrix.value = tranM * matrix.value;
  }

  Matrix4? _getRotationMatrix(
      double radiansDelta,
      Offset focalPoint,
      {bool willVibrate=false}) {

    if (_rotationUpdater.value == null || _rotationUpdater.value!.isNaN) {
      _rotationUpdater.value = radiansDelta;
    } else {
      final rotationDelta = _rotationUpdater.update(radiansDelta);

      var c = cos(rotationDelta);
      var s = sin(rotationDelta);
      var dx = (1 - c) * focalPoint.dx + s * focalPoint.dy;
      var dy = (1 - c) * focalPoint.dy - s * focalPoint.dx;
      final rotationDeltaMatrix = Matrix4(
          c,  s,  0,  0,
          -s, c,  0,  0,
          0,  0,  1,  0,
          dx, dy, 0,  1);

      if(willVibrate){
        vibrateAccumulation += vec.degrees(rotationDelta);
        if (vibrateAccumulation.abs() >= 5) {
          vibrateAccumulation = 0;
          if (canVibrate) {
            Vibration.vibrate(duration: 20, repeat: 1);
          }
        }
      }

      return rotationDeltaMatrix;
    }
    return null;
  }




  void setRotate(double radians) {
    final focalPoint = _model.mapRotateCenter;
    if(focalPoint != null){
      final rotate =  _getRotationMatrix(radians, focalPoint);
      if(rotate!= null){
        var matrix = this.matrix.value;
        this.matrix.value = rotate * matrix;
      }
    }
  }


  void mapModeSwitch() {

    resetMatrix();
    switch (mapMode.value) {
      case MapMode.original:
        mapMode.value = MapMode.compass;
        break;
      case MapMode.compass:
        mapMode.value = MapMode.original;
        break;
    }
  }

  void onMapTouchScaleStart(ScaleStartDetails details) {
    isTouching=true;
    _translationUpdater.value = details.focalPoint;
    _rotationUpdater.value = double.nan;
    _scaleUpdater.value = 1.0;
  }

  Matrix4 _doScale(double scaleDelta, Matrix4 matrix){
    final focalPoint = _model.mapRotateCenter!;
    var dx = (1 - scaleDelta) * focalPoint.dx;
    var dy = (1 - scaleDelta) * focalPoint.dy;
    final scaleDeltaMatrix = Matrix4(
        scaleDelta, 0, 0, 0,
        0, scaleDelta, 0, 0,
        0, 0, 1, 0,
        dx, dy, 0, 1);
    return scaleDeltaMatrix * matrix;
  }

  void onMapTouchScaleUpdate(ScaleUpdateDetails details, Size screen) {

    final focalPoint = _model.mapRotateCenter!;

    var matrix = this.matrix.value;

    // 平移
    if(!_model.isLockScreenCenterToMyPositionSystem){
      final translationDelta = _translationUpdater.update(details.focalPoint);
      final translationDeltaMatrix =
      Matrix4.translationValues(translationDelta.dx, translationDelta.dy, 0);
      matrix = translationDeltaMatrix * matrix;
    }

    // 缩放
    final scale = matrix[0].abs();
    if (details.scale != 1.0) {

      final zoomOutLimit = scale > 0.5 || details.scale > 1;
      // final zoomInLimit = scale < 8 || details.scale < 1;
      final zoomInLimit =  mapScale < 1.7 || details.scale < 1;


      if(zoomOutLimit && zoomInLimit){
        final scaleDelta = _scaleUpdater.update(details.scale);
        matrix = _doScale(scaleDelta, matrix);
      }
    }

    // 旋转
    var rotationDelta = 0.0;
    var willVibrate = false;
    switch (mapMode.value) {
      case MapMode.original:
        rotationDelta = details.rotation;
        willVibrate = true;
        break;
      case MapMode.compass:
        break;
    }

    if(rotationDelta != 0){
      final rotationDeltaMatrix = _getRotationMatrix(
          rotationDelta, focalPoint, willVibrate: willVibrate);

      if(rotationDeltaMatrix!= null){
        matrix = rotationDeltaMatrix * matrix;
      }
    }

    this.matrix.value = matrix;
    calculateMapScale();
  }


  calculateMapScale(){
    const p0Src = Offset(0, 0);
    final p1Src = Offset(gameMapData.width, 0);

    final p0Dst = picOffsetToScreen(p0Src);
    final p1Dst = picOffsetToScreen(p1Src);

    final disPx = sqrt((p1Dst.dx - p0Dst.dx)* (p1Dst.dx - p0Dst.dx)
        + (p1Dst.dy - p0Dst.dy) * (p1Dst.dy - p0Dst.dy));

    final scale = disPx / _mapLenMeter;
    mapScale.value = scale;
    isShowMapScale.value = true;
    _showMapScaleTimer?.cancel();
    _showMapScaleTimer = Timer(3.seconds, () {
      isShowMapScale.value = false;
    });
  }
}

typedef _OnUpdate<T> = T Function(T? oldValue, T newValue);

class _ValueUpdater<T> {
  final _OnUpdate<T> onUpdate;
  T? value;

  _ValueUpdater({required this.onUpdate});

  T update(T newValue) {
    T updated = onUpdate(value, newValue);
    value = newValue;
    return updated;
  }
}