import 'dart:ui';
import 'dart:math' as math;

import 'package:fis_measure/interfaces/date_types/point.dart';
import 'package:fis_measure/interfaces/date_types/rect_region.dart';
import 'package:fis_measure/interfaces/enums/items.dart';
import 'package:fis_measure/interfaces/process/items/item.dart';
import 'package:fis_measure/interfaces/process/items/item_metas.dart';
import 'package:fis_measure/interfaces/process/workspace/point_info.dart';
import 'package:fis_measure/process/calcuators/ray.dart';
import 'package:fis_measure/process/items/item.dart';
import 'package:fis_measure/process/items/item_feature.dart';
import 'package:fis_measure/utils/canvas.dart';

class Ray extends MeasureItem<RayFeature> {
  double _initializeAngle = 0;
  double _initializeAngleVal = 0;
  bool _switchInitialAngle = false;
  Ray(ItemMeta meta, IMeasureItem? parent) : super(meta, parent);

  double get initializeAngle => _initializeAngle;
  set initializeAngle(double value) {
    if (value != _initializeAngle) {
      _initializeAngleVal = value;
      _updateInitializeAngle();
    }
  }

  bool get switchInitialAngle => _switchInitialAngle;
  set switchInitialAngle(bool value) {
    if (value != _switchInitialAngle) {
      _switchInitialAngle = value;
      _updateInitializeAngle();
    }
  }

  @override
  bool onExecuteMouse(PointInfo args) {
    if (state == ItemStates.finished || state == ItemStates.waiting) {
      if (args.pointType == PointInfoType.mouseMove) {
        feature = RayFeature(this, args);
        feature!.hostVisualArea = args.hostVisualArea;
        final viewport = args.hostVisualArea!.viewport!;
        feature!.isReverse =
            viewport.isFlipHorizontal ^ viewport.isFlipVertical;
        state = ItemStates.running;
      }
    }
    if (state == ItemStates.running) {
      if (args.pointType == PointInfoType.mouseUp) return false;

      feature?.point = args;
      doCalculate();
      if (args.pointType == PointInfoType.mouseDown) {
        doFeatureFinish();
      }
    }
    return true;
  }

  // 是否需要结束当前的测量过程，用于移动端的交互
  bool isNeedFinish = true;
  bool isFirstTouch = true;
  DPoint touchStartPoint = DPoint(0, 0);
  DPoint lastLinePosition = DPoint(0, 0);
  @override
  bool onExecuteTouch(PointInfo args) {
    if (state == ItemStates.waiting || state == ItemStates.finished) {
      if (args.pointType == PointInfoType.touchMove) {
        if (measuredFeatures.isEmpty) {
          feature = RayFeature(this, args);
          feature!.hostVisualArea = args.hostVisualArea;
          final viewport = args.hostVisualArea!.viewport!;
          feature!.isReverse =
              viewport.isFlipHorizontal ^ viewport.isFlipVertical;
        } else {
          feature = measuredFeatures.first;
        }
        state = ItemStates.running;
      }
    }

    if (state == ItemStates.running) {
      if (args.pointType == PointInfoType.touchDown) {
        touchStartPoint = args;
        lastLinePosition = feature?.point ?? args;
        isNeedFinish = true;
        isFirstTouch = feature?.point == null;
      }
      if (args.pointType == PointInfoType.touchMove) {
        isNeedFinish = false;
        if (isFirstTouch) {
          if (isMoveTargetOutOfRange(args)) return true;
          feature?.point = args;
        } else {
          PointInfo newPoint = PointInfo.fromOffset(
              lastLinePosition
                  .clone()
                  .addVector(args - touchStartPoint)
                  .toOffset(),
              args.pointType);
          newPoint.hostVisualArea = args.hostVisualArea;
          if (isMoveTargetOutOfRange(newPoint)) return true;
          feature?.point = newPoint;
        }
        doCalculate();
      }
      if (args.pointType == PointInfoType.touchUp && isNeedFinish) {
        doFeatureFinish();
      }
    }
    return true;
  }

  static Ray createRay(ItemMeta meta, [IMeasureItem? parent]) {
    final ray = Ray(meta, parent);
    ray.calculator = RayDepthCal(ray);
    return ray;
  }

  void _updateInitializeAngle() {
    int switchNumber = switchInitialAngle ? -1 : 1;
    _initializeAngle = _initializeAngleVal * switchNumber;
  }
}

class RayFeature extends MeasureItemFeature {
  double _angle = 0;
  bool _isReverse = false;

  RayFeature(Ray refItem, DPoint point) : super(refItem) {
    innerPoints.add(point.clone());
    angle = refItem.initializeAngle;
  }

  DPoint get point => innerPoints[0];
  set point(DPoint value) {
    innerPoints[0] = value;
  }

  double get angle => _angle;
  set angle(double value) {
    if (value != _angle) {
      _angle = value;
    }
  }

  bool get isReverse => _isReverse;
  set isReverse(bool value) {
    if (value != _isReverse) {
      _isReverse = value;
    }
  }

  RectRegion get viewRegion => hostVisualArea!.viewport!.area.layoutRegion!;

  @override
  void paint(Canvas canvas, Size size) {
    if (innerPoints.isEmpty) return;
    final curItemName = refItem.displayName;
    final offset = convert2ViewPoint(size, point).toOffset();
    final rect = Rect.fromLTWH(
        viewRegion.left * size.width,
        viewRegion.top * size.height,
        viewRegion.width * size.width,
        viewRegion.height * size.height);
    List<Offset> twoPoint = [const Offset(0, 0), const Offset(0, 0)];
    final idText = '$id.${refItem.displayName}';
    switch (curItemName) {
      case "Baseline":
        twoPoint = calcLinePoint(rect, offset, 0);
        drawCustomId(canvas, size, twoPoint[1], idText);
        break;
      case "Line α":
        twoPoint = calcLinePoint(rect, offset, angle);
        drawCustomId(canvas, size, twoPoint[1], idText);
        break;
      case "Line β":
        twoPoint = calcLinePoint(rect, offset, 180 - angle);
        drawCustomId(canvas, size, twoPoint[0], idText);
        break;
      default:
        break;
    }
    canvas.drawDashLine(twoPoint[0], twoPoint[1], 1, 10, paintLinePan);
  }

  List<Offset> calcLinePoint(Rect rect, Offset innerPoint, double angle) {
    List<Offset> twoPoint = [const Offset(0, 0), const Offset(0, 0)];
    if (!rect.contains(innerPoint)) return twoPoint;
    final tan = math.tan(angle * math.pi / 180);
    final x = innerPoint.dx;
    final y = innerPoint.dy;
    final d1 = x - y / tan;
    twoPoint[0] = Offset(d1, 0);
    final d2 = (rect.height - y) / tan + x;
    twoPoint[1] = Offset(d2, rect.height);
    if (angle <= 90) {
      if (d1 < rect.left) {
        twoPoint[0] = Offset(rect.left, y - tan * (x - rect.left));
      }
      if (d2 > rect.right) {
        twoPoint[1] = Offset(rect.right, y + tan * (rect.right - x));
      }
    } else {
      if (d1 > rect.right) {
        twoPoint[0] = Offset(rect.right, y - tan * (x - rect.right));
      }
      if (d2 < rect.left) {
        twoPoint[1] = Offset(rect.left, y + tan * (rect.left - x));
      }
    }
    return twoPoint;
  }
}