import 'package:fis_common/event/event_type.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/application.dart';
import 'package:fis_measure/interfaces/process/workspace/point_info.dart';
import 'package:flutter/foundation.dart';

import 'item.dart';
import 'item_feature.dart';

abstract class TopMeasureItem<T extends MeasureItemFeature>
    extends MeasureItem<T> implements ITopMeasureItem {
  final List<IMeasureItem> _childItems = [];
  int _childIndex = 0;
  bool _isCrossFrameMode = false;
  bool _isCrossAreaMode = false;

  bool _canChildOutputSelf = true;

  bool get ifAutoStart => false;
  bool get ifAutoFinish => false;
  bool isNeedRedraw = false;

  TopMeasureItem(ItemMeta meta) : super(meta) {
    workingChildChanged = FEventHandler<int>();
  }

  @override
  List<IMeasureItem> get childItems => _childItems;

  @override
  IMeasureItem get workingChild => _childItems[_childIndex];

  @override
  int get workingChildIndex => _childIndex;

  /// 子项全部完成
  @protected
  bool get childrenAllDone =>
      _childItems.every((e) => e.measuredFeatures.isNotEmpty);

  @override
  bool get finishAfterUnactive => false;

  @override
  bool get repeatableEditable => true;

  @override
  bool get isCrossFrameMode => _isCrossFrameMode;
  @protected
  set isCrossFrameMode(bool val) => _isCrossFrameMode = val;

  @override
  bool get canChildOutputSelf => _canChildOutputSelf;
  set canChildOutputSelf(bool val) => _canChildOutputSelf = val;

  @override
  bool get isCrossAreaMode => _isCrossAreaMode;
  @protected
  set isCrossAreaMode(bool val) => _isCrossAreaMode = val;

  @override
  late final FEventHandler<int> workingChildChanged;

  @override
  void switchChild(int index) {
    if (index == _childIndex) return;
    workingChild.finishOnce();
    _childIndex = index;
    if (workingChild.measuredFeatures.isNotEmpty) {
      isNeedRedraw = true;
      // workingChild.frameIndex = 1;
      IApplication.current!.frameData!.index;
    } else {
      isNeedRedraw = false;
    }
    workingChildChanged.emit(this, index);
  }

  @override
  IMeasureItem findChildByName(String name) {
    try {
      final item = _childItems.firstWhere((e) => e.meta.name == name);
      return item;
    } catch (e) {
      throw ArgumentError("Child item not found.", name);
    }
  }

  T buildFeature();

  @override
  bool onExecuteMouse(PointInfo args) {
    if (ifAutoStart) {
      if (feature == null) {
        feature = buildFeature();
        listenChildrenUpdate();
      }
    }
    if (args.pointType == PointInfoType.mouseDown) {
      if (feature == null) {
        feature = buildFeature();
        listenChildrenUpdate();
      }
      if (childrenAllDone) {
        workingChild.clear();
      }
    }
    feature?.hostVisualArea = args.hostVisualArea;
    final result = workingChild.execute(args);
    if (result) {
      doCalculate();
    }
    if (ifAutoFinish) {
      if (args.pointType == PointInfoType.mouseDown) {
        if (childrenAllDone) {
          application.autoStartAgain(meta);
        }
      }
    }

    return result;
  }

  @override
  bool onExecuteTouch(PointInfo args) {
    if (ifAutoStart) {
      if (feature == null) {
        feature = buildFeature();
        listenChildrenUpdate();
      }
    }
    if (args.pointType == PointInfoType.touchDown) {
      if (feature == null) {
        feature = buildFeature();
        listenChildrenUpdate();
      }
      if (childrenAllDone || workingChild.measuredFeatures.isNotEmpty) {
        workingChild.clear();
      }
    }
    feature?.hostVisualArea = args.hostVisualArea;
    final result = workingChild.execute(args);
    if (result) {
      doCalculate();
    }
    if (ifAutoFinish) {
      if (args.pointType == PointInfoType.touchUp) {
        if (childrenAllDone) {
          application.autoStartAgain(meta);
        }
      }
    }

    return result;
  }

  @protected
  void nextChild() {
    final count = _childItems.length;
    int nextIdx = -1;
    for (var i = 0; i < count; i++) {
      final child = _childItems[i];
      if (child.measuredFeatures.isEmpty) {
        nextIdx = i;
        break;
      }
    }
    if (nextIdx > -1) {
      switchChild(nextIdx);
    }
  }

  @protected
  void listenChildrenUpdate() {
    for (var item in childItems) {
      item.featureUpdated.addListener((sender, e) {
        _onChildFeatureUpdated();
      });
    }
  }

  void _onChildFeatureUpdated() {
    if (workingChild.measuredFeatures.isNotEmpty && !isNeedRedraw) {
      nextChild();
    }
    doFeatureUpdate();
  }
}