import 'package:fis_measure/interfaces/date_types/point.dart';
import 'package:fis_measure/interfaces/process/calculators/values.dart';
import 'package:fis_measure/interfaces/process/items/item.dart';
import 'package:fis_measure/interfaces/process/items/item_feature.dart';
import 'package:fis_measure/interfaces/process/items/item_metas.dart';
import 'package:fis_measure/interfaces/process/visuals/visual_area.dart';
import 'package:fis_measure/utils/canvas.dart';
import 'package:fis_measure/values/colors.dart';
import 'package:flutter/widgets.dart';
import 'package:get/get.dart';
import 'package:vid/us/vid_us_unit.dart';

import 'item.dart';

abstract class MeasureItemFeature implements IMeasureItemFeature {
  late IMeasureItem _refItem;
  late List<DPoint> _innerPoints;
  IVisualArea? _hostVisualArea;
  bool _isActive = true;
  int _id = 0;
  final List<ValueBase> _values = [];
  int _activeIndex = -1;

  @protected
  final paintPan = Paint()
    ..color = const Color.fromARGB(255, 255, 255, 0)
    ..isAntiAlias = true
    ..strokeWidth = 2
    ..style = PaintingStyle.stroke;

  MeasureItemFeature(IMeasureItem refItem) {
    _refItem = refItem;
    if (refItem.parent != null) {
      _id = refItem.parent!.feature?.id ?? 0;
    } else {
      _id = refItem.assignId();
    }

    _innerPoints = [];
    _recordHistory();
  }

  int get activeIndex => _activeIndex;
  set activeIndex(int val) {
    if (val != _activeIndex) {
      _activeIndex = val;
    }
  }

  @override
  List<DPoint> get innerPoints => _innerPoints;

  @override
  MeasureItem get refItem => _refItem as MeasureItem;

  ///   所在区域
  IVisualArea? get hostVisualArea => _hostVisualArea;
  set hostVisualArea(IVisualArea? value) {
    if (value != _hostVisualArea) {
      _hostVisualArea = value;
    }
  }

  @override
  bool get isActive => _isActive;
  set isActive(bool value) {
    if (value != _isActive) {
      _isActive = value;
    }
  }

  @override
  int get id => _id;

  /// 顶点尺寸
  double get vertexSize => 10.0 * refItem.scaleRatio;

  @override
  List<ValueBase> get values => _values;

  @override
  ValueBase? get value => _values.isNotEmpty ? _values.first : null;

  /// 更新浮点型结果值
  FloatValue? updateFloatValue(
    ItemOutputMeta outputMeta,
    double value,
    VidUsUnit unit,
  ) {
    final valueBase =
        values.firstWhereOrNull((e) => e.meta.name == outputMeta.name);
    if (valueBase == null) {
      final floatValue = FloatValue(outputMeta, value, unit);
      values.add(floatValue);
      return floatValue;
    } else {
      final floatValue = valueBase as FloatValue;
      floatValue.value = value;
      floatValue.unit = unit;
      return floatValue;
    }
  }

  /// 更新字符串结果值
  StringValue updateStringValue(
    ItemOutputMeta outputMeta,
    String value, [
    VidUsUnit unit = VidUsUnit.None,
  ]) {
    final valueBase = values.firstWhereOrNull((e) => e.name == outputMeta.name);
    if (valueBase == null) {
      final stringValue = StringValue(outputMeta, value, unit);
      values.add(stringValue);
      return stringValue;
    } else {
      final stringValue = valueBase as StringValue;
      stringValue.value = value;
      stringValue.unit = unit;
      return stringValue;
    }
  }

  @protected
  DPoint convert2ViewPoint(Size size, DPoint logicPoint) {
    final x = size.width * logicPoint.x;
    final y = size.height * logicPoint.y;
    return DPoint(x, y);
  }

  /// 画序号
  ///
  /// [text] 自定义序号内容
  @protected
  void drawId(Canvas canvas, Size size, [String? text]) {
    final String displayText;
    if (refItem.parent == null) {
      displayText = text ?? id.toString();
    } else {
      displayText = '$id.${refItem.description}';
    }

    final point = innerPoints[0];
    var offset = convert2ViewPoint(size, point).toOffset();
    return drawCustomId(canvas, size, offset, displayText);
  }

  /// 画自定义位置的序号
  /// [offset] 位置
  /// [text] 自定义序号内容
  @protected
  void drawCustomId(Canvas canvas, Size size, Offset offset, [String? text]) {
    final displayText = text ?? id.toString();
    final fontSize = 14.0 * refItem.scaleRatio; // TODO: from config
    final fontOffsetY = 4.0 * refItem.scaleRatio;
    final letterSpacing = 0.0 * refItem.scaleRatio;
    final style = TextStyle(
      fontSize: fontSize,
      color: MeasureColors.Primary,
      // fontWeight: FontWeight.bold,
      letterSpacing: letterSpacing,
    );

    final fontPlace = boundingTextSize(displayText, style);
    double transY = 0;
    double transX = 0;
    final vertexOffsetW = vertexSize / 2;
    if (offset.dx < fontPlace.width) {
      transX = fontSize + vertexOffsetW;
    } else {
      transX = -fontPlace.width - vertexOffsetW;
    }
    if (offset.dy < fontPlace.height + fontOffsetY) {
      transY = fontOffsetY;
    } else {
      transY = -fontPlace.height - fontOffsetY;
    }
    offset = offset.translate(transX, transY);

    canvas.drawText(
      displayText,
      offset,
      style: style,
    );
  }

  /// 画顶点
  void drawVertex(Canvas canvas, Offset offset, [bool active = false]) {
    canvas.drawVertex(offset, vertexSize, active: active);
  }

  /// 画短横标记
  void drawMark(Canvas canvas, Offset offset,
      [bool active = false, bool ifHorizontal = true]) {
    canvas.drawMark(offset, vertexSize,
        active: active, ifHorizontal: ifHorizontal);
  }

  /// 计算文本长度
  static Size boundingTextSize(
    String text,
    TextStyle style, {
    int maxLines = 2 ^ 31,
    double maxWidth = double.infinity,
  }) {
    // if (Get.context == null) return Size.zero;
    if (text.isEmpty) return Size.zero;

    final TextPainter textPainter = TextPainter(
      textDirection: TextDirection.ltr,
      // locale: Localizations.localeOf(Get.context!),
      text: TextSpan(text: text, style: style),
      maxLines: maxLines,
    )..layout(maxWidth: maxWidth);
    return textPainter.size;
  }

  void _recordHistory() {
    if (refItem.parent == null) {
      final recorder = refItem.application.recorder;
      recorder.recordMeasureItem(refItem.meta.name);
    }
  }
}