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/workspace/point_info.dart';
import 'package:fis_measure/utils/canvas.dart';
import 'package:path_drawing/path_drawing.dart';

import '../calcuators/area.dart';
import '../calcuators/perimeter.dart';
import '../items/item.dart';
import '../items/item_feature.dart';

class PolyLine extends MeasureItem<PolyLineFeature> {
  final bool _initialClosed = false;
  PointInfo? _firstPoint;

  PolyLine(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 {
        _checkAutoFinish(args);
      }
    }
    return true;
  }

  void _doFinish() {
    doFeatureFinish();
    _firstPoint = null;
  }

  void _checkAutoFinish(PointInfo current) {
    if (feature == null || feature!.innerPoints.length < 3) return;

    double autoSnapDistance = 0.01; //TODO: from config
    double autoSnapThreshold = 0.05;
    bool isAutoSnap = true; //TODO: from config
    if (isAutoSnap == false) return;

    // final viewport = feature!.hostVisualArea!.viewport!;
    var length = (feature!.firstPoint - current).length;
    if (length > autoSnapThreshold * 2.0 && !feature!.isSmartMove) {
      feature!.isSmartMove = true;
    }
    if (length < autoSnapThreshold && feature!.isSmartMove) {
      _doFinish();
    }
    // final logicStart = feature!.innerPoints.first;
    // final logicEnd = feature!.innerPoints.last;

    // // isSmartMove
    // if (logicEnd.almostEquals(logicStart, 0.01)) {
    //   feature!.innerPoints.add(feature!.innerPoints.first); // 强制闭合
    //   doFeatureFinish();
    // }
  }

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

  @override
  bool onExecuteTouch(PointInfo args) {
    return true;
  }

  /// 创建面积测量
  static PolyLine createArea(
    ItemMeta meta, [
    IMeasureItem? parent,
  ]) {
    PolyLine poyline = PolyLine(meta, parent);
    poyline.calculator = PolyLineAreaCal(poyline);
    return poyline;
  }

  /// 创建周长测量
  static PolyLine createPerimeter(
    ItemMeta meta, [
    IMeasureItem? parent,
  ]) {
    PolyLine poyline = PolyLine(meta, parent);
    poyline.calculator = PolyLinePerimeterCal(poyline);
    return poyline;
  }
}

class PolyLineFeature extends MeasureItemFeature {
  bool _isClosed = false;
  bool _isSmartMove = false;

  PolyLineFeature(IMeasureItem refItem) : super(refItem);

  /// 是否闭合？抄自超声机
  bool get isClosed => _isClosed;
  set isClosed(bool value) {
    if (value != _isClosed) {
      _isClosed = value;
    }
  }

  /// 是否启动智能定位
  bool get isSmartMove => _isSmartMove;
  set isSmartMove(bool value) {
    if (value != _isSmartMove) {
      _isSmartMove = value;
    }
  }

  /// 首节点
  DPoint get firstPoint => innerPoints.first;

  /// 接收新坐标
  void adopt(DPoint point) {
    innerPoints.add(point);
  }

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

    // TODO: from style config
    const double vertexSize = 10;

    final points = innerPoints.map((e) => convert2ViewPoint(size, e)).toList();
    final startPoint = points.first;
    canvas.drawVertex(
      startPoint.toOffset(),
      vertexSize,
      active: 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);
      }
      path.lineTo(startPoint.x, startPoint.y);
      canvas.drawPath(
        dashPath(path, dashArray: CircularIntervalList([2.0, 10.0])),
        paintPan,
      );
    }

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