import 'dart:math';
import 'dart:typed_data';
import 'dart:convert';
import 'package:flutter/material.dart';

class DrawContext {
  DrawContext();
  // 中心坐标
  //左下角显示的坐标
  double zeroDX = 0;
  double zeroDY = 0;
  //上一次的坐标
  double zeroX = 0;
  double zeroY = 0;
  // 缩放
  double scale = 1;
  double lastScale = 1;
  // 屏幕尺寸
  Size screenSize = const Size(100, 100);
  //暂时没用
  static int unit = 20;
  //弧度
  double angle = 0;
  double lastAngle = 0;
  List<double> grounScaleList = [
    78271.5170,
    39135.7585,
    19567.8792,
    9783.9396,
    4891.9698,
    2445.9849,
    1222.9925,
    611.4962,
    305.7481,
    152.8741,
    76.4370,
    38.2185,
    19.1093,
    9.5546,
    4.7773,
    2.3887,
    1.1943,
    0.5972,
    0.2986,
    0.1493,
    0.0746,
    0.0373,
    0.0187
  ];
  // 是否显示标尺
  bool isRuler = false;
  bool isScale = true;
  // 是否显示地图
  bool isMap = true;
  // 坐标点
  List dotList = [];
  // 按下的点
  int? currentDotIndex;

//暂时没用
  List polyonList = [];
  int polyonExpendIndex = 0;
  // 当前移动的点
  Offset currentDot = const Offset(0, 0);
  //没用
  int groundScaleIndex = 21;
  //偏移坐标
  Offset pos = const Offset(0, 0);
  Offset lastPos = const Offset(0, 0);
// 控制位移图的大小
  bool isNomal = true;

  double mark = 1000;//显示当前比例尺，因为缩放的原因，比例尺有[8,40,200,1000]；四种，默认倍数是100，那么mark默认1000
  double space = 1;
  List? pointList;
  List<List<double>> gengerateList = [];
  List<Widget> devicePositioned=[];

  /// @param {double} m - 米
  m2px(double m) {
    return m / 20 / scale;
  }

  /// @param {double} px - 像素
  px2m(double px) {
    return px * 20 / scale;
  }

  // x是平面坐标的竖直方向
  /// @param {num} x - 坐标x
  /// @param {num} y - 坐标y
  // xy2Screen(num x, num y, [k = 1]) {
  //   double screenx = (y / k * scale - zeroDX);
  //   double screeny = (screenSize.height - (x / k * scale - zeroDY));
  //   return Offset(screenx, screeny);
  // }
  xy2Screen(num x, num y, [k = 1]) {
    double screenx = (y * k / (scale) - zeroDX);
    double screeny = (screenSize.height - (x * k / (scale) - zeroDY));
    return Offset(screenx, screeny);
  }

  /// @param {screenOffset} x - 屏幕坐标Offset(x,y)
  screen2xy(Offset screenOffset, [k = 1]) {
    // double X = (screenOffset.dy / k * scale + zeroDX);
    // double Y = (screenSize.height - screenOffset.dx / k * scale + zeroDY);
    double Y =  (screenOffset.dx+zeroDX)*scale/k;
    double X=(screenSize.height-screenOffset.dy+zeroDY)*scale/k;
    // double X = (screenOffset.dx * k + zeroDX);
    // double Y = (screenSize.height - screenOffset.dy * k + zeroDY);
    return Offset(X, Y);
  }

//设置缩放
  /// @param {Size} size - (width,height)
  setSize(Size size) {
    screenSize = size;
    if (screenSize != size) {
      setCenter(null);
      lastScale = scale;
      screenSize = size;
    }
  }

// 设置中心坐标
  // setCenter(obj, [k = 1]) {
  //   if (obj != null) {
  //     zeroDX = ((obj['y'] * k * scale - screenSize.width / 2).abs())
  //         .floor()
  //         .toDouble();
  //     zeroDY = ((obj['x'] * k * scale - screenSize.height / 2).abs())
  //         .floor()
  //         .toDouble();
  //     zeroX = (obj['x'] * k).toDouble();
  //     zeroY = (obj['y'] * k).toDouble();
  //   } else {
  //     zeroDX =
  //         ((zeroY * k * scale - screenSize.width / 2).abs()).floor().toDouble();
  //     zeroDY = ((zeroX * k * scale - screenSize.height / 2).abs())
  //         .floor()
  //         .toDouble();
  //   }
  // }
  setCenter(obj, [k = 1]) {
    scale = 1;
    if (obj != null) {
      zeroDX = (((obj["x"] as num) / k / (scale) - screenSize.width / 2).abs())
          .floor()
          .toDouble();
      zeroDY = (((obj["y"] as num) / k / (scale) - screenSize.height / 2).abs())
          .floor()
          .toDouble();
      zeroX = ((obj["x"])).toDouble();
      zeroY = ((obj["y"])).toDouble();
      // print("$zeroDX,$zeroDY");
    } else {
      zeroDX = ((zeroX / k / (scale)- screenSize.width / 2).abs())
          .floor()
          .toDouble();
      zeroDY = ((zeroY / k / (scale) - screenSize.height / 2).abs())
          .floor()
          .toDouble();

    }
  }

  // 没有用
  // getGridStepXY() {
  //   double dx = (zeroX % 100) * 20 / scale;
  //   double dy = (zeroY % 100) * 20 / scale;
  //   double step =
  //       scaleList[scale.toInt() - 1 < 0 ? 0 : scale.toInt() - 1] / scale;
  //   return GridStepXY(step, dx, dy);
  // }

  setZeroOffset(Offset pos) {
    //移动当前中心
    zeroDX -= pos.dx;
    zeroDY += pos.dy;
    //将偏移值附加给存储的zeroX和Y,保证缩放的时候仍然保留之前的偏移量
    zeroX -=pos.dx*scale ;
    zeroY += pos.dy*scale;
  }

//设置当前移动点的坐标
  setCurrentDot(Offset offset) {
    currentDot = offset;
  }

  setDotListIndex(Offset offset) {
    dotList[currentDotIndex!] = offset;
  }

  setDotList(List list) {
    dotList = list;
  }

  /// @param {int} index - 下标位置
  setPolyonList(int index, List lists) {
    List arr = [];
    // List arr1 = [];
    for (int i = 0; i < lists.length; i++) {
      Offset list = screen2xy(lists[i]);
      arr.add(list);
    }
    polyonList[index].list = arr;
  }

  // 点到直线得距离
  /// @param {Offset} dot -  3个点
  double dot2Line(Offset dot1, Offset dot2, Offset dot) {
    double A = (dot1.dy - dot2.dy) / (dot1.dx - dot2.dx); //1,2直线的斜率
    double B = dot1.dy - A * dot1.dx; //斜率

    double distance =
        ((A * dot.dx + B - dot.dy) / sqrt(A * A + 1)).abs(); //求3和直线1,2的距离
    return distance;
  }

// 获取地面分辨率的索引，暂时没用
  int getGroundScaleIndex(double sacle) {
    groundScaleIndex = grounScaleList.lastIndexWhere((el) => el > scale) + 1;
    return groundScaleIndex;
  }

// 获取地面分辨率，暂时没用
  double getGroundScale() {
    return grounScaleList[groundScaleIndex - 1];
  }

  // 点的信息
  pointInfo(Offset point) {
    if (pointList != null && pointList!.isNotEmpty) {
      for (var el in pointList!) {
        double x = ((el['dx'] as double) - point.dx).abs();
        double y = ((el['dy'] as double) - point.dy).abs();
        if (x <= 15 && y <= 15) {
          return el;
        }
      }
    }
  }
}

// 暂时没有用
class GridStepXY {
  double step;
  double dx;
  double dy;
  GridStepXY(this.step, this.dx, this.dy);
}

//暂时没用
class Polyon {
  String label;
  String key;
  bool expend;
  List list;

  Polyon(this.key, this.label, this.list, [this.expend = false]);
}