// ignore_for_file: non_constant_identifier_names, constant_identifier_names

import 'dart:typed_data';

import 'package:fis_common/event/event_type.dart';
import 'package:fis_measure/interfaces/process/standard_line/pixel_space.dart';
import 'package:fis_measure/interfaces/process/standard_line/standard_line.dart';
import 'package:fis_vid_ext/vid_extended_data.dart';
import 'package:fis_vid_ext/vid_tag.dart';
import 'package:fis_vid_ext/vid_value.dart';

/// 参考线
class StandardLine extends IStandardLine {
  /// Default Standard Line Physical Length (unit cm)
  static const double DefaultPhysicsLength = 4.0;

  /// 0028,0030   PixelSpacing from dicom
  static final VidTag DicomTagPixelSpacing = VidTag("0028", "0030");

  /// 0018, 602E Physical Delta Y
  static final VidTag DicomTagPhysicalDeltaY = VidTag("0018", "602E");

  /// 0018,602C  Physical Delta X
  static final VidTag DicomTagPhysicalDeltaX = VidTag("0018", "602C");

  /// 0018, 6024 Physical Units X
  static final VidTag DicomTagPhysicalUnitsX = VidTag("0018", "6024");

  /// 0018, 6026 Physical Units Y
  static final VidTag DicomTagPhysicalUnitsY = VidTag("0018", "6026");

  PixelSpacing _currentPixelSpacing = PixelSpacing();
  double _physicsLength = DefaultPhysicsLength;
  double _pixelLength = 0.0;
  double _perPixelPhysicalLength = 0.0;

  StandardLine() {
    pixelSpacingChanged = FEventHandler<PixelSpacing?>();
  }

  /// 参考线物理长度(cm)
  @override
  double get physicsLength => _physicsLength;
  @override
  set physicsLength(double val) {
    if (val != _physicsLength) {
      _physicsLength = val;
      _onLineLengthChanged();
    }
  }

  /// 参考线像素长度
  @override
  double get pixelLength => _pixelLength;
  @override
  set pixelLength(double val) {
    if (val != _pixelLength) {
      _pixelLength = val;
      _onLineLengthChanged();
    }
  }

  /// 单位像素物理长度(cm)
  @override
  double get perPixelPhysicalLength => _perPixelPhysicalLength;

  /// 当前像素距离尺
  @override
  PixelSpacing get currentPixelSpacing => _currentPixelSpacing;
  @override
  set currentPixelSpacing(PixelSpacing val) {
    if (val != _currentPixelSpacing) {
      _currentPixelSpacing = val;
      _onPixelSpacingChanged();
    }
  }

  /// 像素距离尺变化事件
  @override
  late final FEventHandler<PixelSpacing?> pixelSpacingChanged;

  /// 通过vid扩展信息加载像素距离信息
  void loadFromVidExtData(Uint8List bytes) {
    final extInfo = VidExtendedData.fromBytes(bytes);
    if (extInfo == null) {
      currentPixelSpacing = PixelSpacing();
      return;
    }

    PixelSpacing pixelSpacing = PixelSpacing();
    var pixelSpacingValue = _getVidValueByTag(DicomTagPixelSpacing, extInfo);
    if (pixelSpacingValue != null) {
      var pixelSpacingArray =
          pixelSpacingValue.getValue().toString().split('\\');
      if (pixelSpacingArray.length > 1) {
        double? pixelSpacingX = double.tryParse(pixelSpacingArray[0]);
        if (pixelSpacingX != null) {
          pixelSpacing.physicalDeltaX = pixelSpacingX;
        }
        double? pixelSpacingY = double.tryParse(pixelSpacingArray[1]);
        if (pixelSpacingY != null) {
          pixelSpacing.physicalDeltaY = pixelSpacingY;
        }
      }
    } else {
      pixelSpacing.physicalDeltaX = _getPhysicalDeltaX(extInfo);
      pixelSpacing.physicalDeltaY = _getPhysicalDeltaY(extInfo);
    }
    if (pixelSpacing.physicalDeltaX > 0 &&
        pixelSpacing.physicalDeltaX < 1.0 &&
        pixelSpacing.physicalDeltaY > 0 &&
        pixelSpacing.physicalDeltaY < 1.0) {
      currentPixelSpacing = pixelSpacing;
    } else {
      currentPixelSpacing = PixelSpacing();
    }
    if (currentPixelSpacing.isEmpty == false) {
      _initPixelLength();
    }
  }

  /// 加载初始参考线像素长度
  void _initPixelLength() {
    final pixelsPerCM = 1 / _perPixelPhysicalLength;
    _pixelLength = pixelsPerCM * physicsLength;
  }

  void _onLineLengthChanged() {
    final physicalDeltaX = physicsLength * 10 / pixelLength;
    final physicalDeltaY = physicalDeltaX;
    currentPixelSpacing = PixelSpacing.fill(physicalDeltaX, physicalDeltaY);
  }

  void _onPixelSpacingChanged() {
    _perPixelPhysicalLength =
        _getPixelLengthWithUnit(currentPixelSpacing.physicalDeltaX);
    pixelSpacingChanged.emit(this, currentPixelSpacing);
  }

  double _getPixelLengthWithUnit(double length) {
    // if (_mearsureUnit == MearsureUnit.cm)
    // {
    length = length / 10;
    // }
    return length;
  }

  IVidValue? _getVidValueByTag(VidTag vidTag, VidExtendedData extendedData) {
    var matchKeys = extendedData.data.keys
        .where((v) => v.group == vidTag.group && v.element == vidTag.element);
    if (matchKeys.isNotEmpty) {
      final vidTagKey = matchKeys.first;
      var vidValue = extendedData.data[vidTagKey];
      return vidValue;
    }
    return null;
  }

  double _getPhysicalDeltaX(VidExtendedData extendedData) {
    final physicalDeltaXvalue =
        _getVidValueByTag(DicomTagPhysicalDeltaX, extendedData);
    if (physicalDeltaXvalue != null) {
      final physicalUnitsXvalue =
          _getVidValueByTag(DicomTagPhysicalUnitsX, extendedData);
      if (physicalUnitsXvalue != null) {
        var unitsvalue = int.parse(physicalUnitsXvalue.getValue().toString());
        if (unitsvalue == 3) {
          var physicalDeltaX =
              double.parse(physicalDeltaXvalue.getValue().toString()) * 10;
          return physicalDeltaX;
        }
      }
    }
    return 1.0;
  }

  double _getPhysicalDeltaY(VidExtendedData extendedData) {
    final physicalDeltaYvalue =
        _getVidValueByTag(DicomTagPhysicalDeltaY, extendedData);
    if (physicalDeltaYvalue != null) {
      final physicalUnitsYvalue =
          _getVidValueByTag(DicomTagPhysicalUnitsY, extendedData);
      if (physicalUnitsYvalue != null) {
        var unitsvalue = int.parse(physicalUnitsYvalue.getValue().toString());
        if (unitsvalue == 3) {
          var physicalDeltaX =
              double.parse(physicalDeltaYvalue.getValue().toString()) * 10;
          return physicalDeltaX;
        }
      }
    }
    return 1.0;
  }
}