import 'dart:ui';

import 'package:fis_measure/interfaces/date_types/point.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/curve.dart';
import 'package:fis_measure/process/primitives/utils/auto_snap.dart';
import 'package:path_drawing/path_drawing.dart';
import 'area_abstract.dart';

/// 手势轨迹图形
class Trace extends AreaItemAbstract with AutoSnapMixin {
  Trace(ItemMeta meta, IMeasureItem? parent) : super(meta, parent);

  @override
  bool onExecuteMouse(PointInfo args) {
    if (state == ItemStates.finished) {
      if (args.pointType == PointInfoType.mouseDown) {
        state = ItemStates.waiting;
      }
    }

    if (state == ItemStates.waiting) {
      if (args.pointType == PointInfoType.mouseDown) {
        handleMouseDownWhileWaiting(args);
      }
    } else if (state == ItemStates.running) {
      if (args.pointType == PointInfoType.mouseUp) return false;

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

  PointInfo? startPoint;
  bool isFirstPointNeedOffset = false; // 第一个点是否需要施加偏移
  DPoint traceTouchStartPoint = DPoint(0, 0); // 轨迹触摸起始点
  @override
  bool onExecuteTouch(PointInfo args) {
    if (state == ItemStates.finished) {
      if (args.pointType == PointInfoType.touchDown) {
        state = ItemStates.waiting;
      }
    }

    if (state == ItemStates.waiting) {
      if (isFirstPointNeedOffset) args.addOffset(0, -0.2);
      switch (args.pointType) {
        case PointInfoType.touchDown:
          isFirstPointNeedOffset = false;
          handleTouchBeforeStart(args);
          break;
        case PointInfoType.touchUp:
          state = ItemStates.running;
          startPoint = args; // 设置线段起点
          feature?.innerPoints.first = args;
          break; // 按下立即抬起无事发生
        case PointInfoType.touchMove:
          isFirstPointNeedOffset = true;
          if (isMoveTargetOutOfRange(args)) return true;
          feature?.innerPoints.first = args;
          break;
        default:
          break;
      }
    } else if (state == ItemStates.running) {
      // if (isFirstPointNeedOffset) args.addOffset(0, -0.2);
      if (args.pointType == PointInfoType.touchDown) {
        traceTouchStartPoint = args;
      }
      if (args.pointType == PointInfoType.touchUp) {
        doFeatureFinish();
      }
      if (args.pointType == PointInfoType.touchMove) {
        PointInfo newPoint = PointInfo.fromOffset(
            startPoint!
                .clone()
                .addVector(args - traceTouchStartPoint)
                .toOffset(),
            startPoint!.pointType);
        newPoint.hostVisualArea = args.hostVisualArea;
        if (isMoveTargetOutOfRange(newPoint)) return true;
        feature?.adopt(newPoint);
        doCalculate();
        checkAutoSnap(newPoint);
      }
    }
    return true;
  }

  @override
  void doFeatureFinish() {
    super.doFeatureFinish();
  }

  void handleMouseDownWhileWaiting(PointInfo args) {
    // TODO: 判断是否当前area
    // 转换为Area逻辑位置
    feature = TraceFeature(this);
    if (args.hostVisualArea != null) {
      feature!.hostVisualArea = args.hostVisualArea;
    }
    final point = args.toAreaLogicPoint();
    feature!.adopt(point);
    state = ItemStates.running;
  }

  void handleTouchBeforeStart(PointInfo args) {
    // TODO: 判断是否当前area
    // 转换为Area逻辑位置
    feature = TraceFeature(this);
    if (args.hostVisualArea != null) {
      feature!.hostVisualArea = args.hostVisualArea;
    }
    final point = args.toAreaLogicPoint();
    feature!.adopt(point);
  }

  static Trace createAreaPerimeter(
    ItemMeta meta, [
    IMeasureItem? parent,
  ]) {
    Trace trace = Trace(meta, parent);
    trace.calculator = AreaPerimeterCal(trace);
    return trace;
  }

  static Trace createCurveLength(
    ItemMeta meta, [
    IMeasureItem? parent,
  ]) {
    Trace trace = Trace(meta, parent);
    trace.calculator = CurveLengthCal(trace);
    trace.isClosed = false;
    return trace;
  }
}

class TraceFeature extends AreaItemFeatureAbstract {
  TraceFeature(AreaItemAbstract refItem) : super(refItem);

  @override
  void paint(Canvas canvas, Size size) {
    if (innerPoints.isEmpty) return;

    drawId(canvas, size);

    final points = innerPoints.map((e) => convert2ViewPoint(size, e)).toList();
    final startPoint = points.first;
    drawVertex(canvas, startPoint.toOffset(), points.length == 1);

    if (points.length > 1) {
      final Path path = Path();
      path.moveTo(startPoint.x, startPoint.y);
      for (var i = 1; i < points.length; i++) {
        final point = points[i];
        path.lineTo(point.x, point.y);
      }
      if (isClosed) {
        path.lineTo(startPoint.x, startPoint.y);
      }
      canvas.drawPath(
        dashPath(path, dashArray: CircularIntervalList([2.0, 10.0])),
        paintLinePan,
      );
    }

    drawVertex(canvas, points.last.toOffset(), isActive);
  }

  /// 绘制灌注图
  @override
  void paintPerfusion(Canvas canvas, Size size) {}
}