(function (global, factory) {
  if (typeof define === "function" && define.amd) {
    define(["exports", "three", "../libs/fflate.module.js", "../misc/Volume.js"], factory);
  } else if (typeof exports !== "undefined") {
    factory(exports, require("three"), require("../libs/fflate.module.js"), require("../misc/Volume.js"));
  } else {
    var mod = {
      exports: {}
    };
    factory(mod.exports, global.three, global.fflateModule, global.Volume);
    global.NRRDLoader = mod.exports;
  }
})(typeof globalThis !== "undefined" ? globalThis : typeof self !== "undefined" ? self : this, function (_exports, _three, fflate, _Volume) {
  "use strict";

  Object.defineProperty(_exports, "__esModule", {
    value: true
  });
  _exports.NRRDLoader = void 0;
  fflate = _interopRequireWildcard(fflate);

  function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }

  function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }

  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

  function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

  function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }

  function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } Object.defineProperty(subClass, "prototype", { value: Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }), writable: false }); if (superClass) _setPrototypeOf(subClass, superClass); }

  function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

  function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

  function _possibleConstructorReturn(self, call) { if (call && (typeof call === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }

  function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

  function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }

  function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

  var NRRDLoader = /*#__PURE__*/function (_Loader) {
    _inherits(NRRDLoader, _Loader);

    var _super = _createSuper(NRRDLoader);

    function NRRDLoader(manager) {
      _classCallCheck(this, NRRDLoader);

      return _super.call(this, manager);
    }

    _createClass(NRRDLoader, [{
      key: "load",
      value: function load(url, onLoad, onProgress, onError) {
        var scope = this;
        var loader = new _three.FileLoader(scope.manager);
        loader.setPath(scope.path);
        loader.setResponseType('arraybuffer');
        loader.setRequestHeader(scope.requestHeader);
        loader.setWithCredentials(scope.withCredentials);
        loader.load(url, function (data) {
          try {
            onLoad(scope.parse(data));
          } catch (e) {
            if (onError) {
              onError(e);
            } else {
              console.error(e);
            }

            scope.manager.itemError(url);
          }
        }, onProgress, onError);
      }
    }, {
      key: "parse",
      value: function parse(data) {
        // this parser is largely inspired from the XTK NRRD parser : https://github.com/xtk/X
        var _data = data;
        var _dataPointer = 0;

        var _nativeLittleEndian = new Int8Array(new Int16Array([1]).buffer)[0] > 0;

        var _littleEndian = true;
        var headerObject = {};

        function scan(type, chunks) {
          if (chunks === undefined || chunks === null) {
            chunks = 1;
          }

          var _chunkSize = 1;
          var _array_type = Uint8Array;

          switch (type) {
            // 1 byte data types
            case 'uchar':
              break;

            case 'schar':
              _array_type = Int8Array;
              break;
            // 2 byte data types

            case 'ushort':
              _array_type = Uint16Array;
              _chunkSize = 2;
              break;

            case 'sshort':
              _array_type = Int16Array;
              _chunkSize = 2;
              break;
            // 4 byte data types

            case 'uint':
              _array_type = Uint32Array;
              _chunkSize = 4;
              break;

            case 'sint':
              _array_type = Int32Array;
              _chunkSize = 4;
              break;

            case 'float':
              _array_type = Float32Array;
              _chunkSize = 4;
              break;

            case 'complex':
              _array_type = Float64Array;
              _chunkSize = 8;
              break;

            case 'double':
              _array_type = Float64Array;
              _chunkSize = 8;
              break;
          } // increase the data pointer in-place


          var _bytes = new _array_type(_data.slice(_dataPointer, _dataPointer += chunks * _chunkSize)); // if required, flip the endianness of the bytes


          if (_nativeLittleEndian != _littleEndian) {
            // we need to flip here since the format doesn't match the native endianness
            _bytes = flipEndianness(_bytes, _chunkSize);
          }

          if (chunks == 1) {
            // if only one chunk was requested, just return one value
            return _bytes[0];
          } // return the byte array


          return _bytes;
        } //Flips typed array endianness in-place. Based on https://github.com/kig/DataStream.js/blob/master/DataStream.js.


        function flipEndianness(array, chunkSize) {
          var u8 = new Uint8Array(array.buffer, array.byteOffset, array.byteLength);

          for (var _i2 = 0; _i2 < array.byteLength; _i2 += chunkSize) {
            for (var j = _i2 + chunkSize - 1, k = _i2; j > k; j--, k++) {
              var tmp = u8[k];
              u8[k] = u8[j];
              u8[j] = tmp;
            }
          }

          return array;
        } //parse the header


        function parseHeader(header) {
          var data, field, fn, i, l, m, _i, _len;

          var lines = header.split(/\r?\n/);

          for (_i = 0, _len = lines.length; _i < _len; _i++) {
            l = lines[_i];

            if (l.match(/NRRD\d+/)) {
              headerObject.isNrrd = true;
            } else if (l.match(/^#/)) {} else if (m = l.match(/(.*):(.*)/)) {
              field = m[1].trim();
              data = m[2].trim();
              fn = _fieldFunctions[field];

              if (fn) {
                fn.call(headerObject, data);
              } else {
                headerObject[field] = data;
              }
            }
          }

          if (!headerObject.isNrrd) {
            throw new Error('Not an NRRD file');
          }

          if (headerObject.encoding === 'bz2' || headerObject.encoding === 'bzip2') {
            throw new Error('Bzip is not supported');
          }

          if (!headerObject.vectors) {
            //if no space direction is set, let's use the identity
            headerObject.vectors = [new _three.Vector3(1, 0, 0), new _three.Vector3(0, 1, 0), new _three.Vector3(0, 0, 1)]; //apply spacing if defined

            if (headerObject.spacings) {
              for (i = 0; i <= 2; i++) {
                if (!isNaN(headerObject.spacings[i])) {
                  headerObject.vectors[i].multiplyScalar(headerObject.spacings[i]);
                }
              }
            }
          }
        } //parse the data when registred as one of this type : 'text', 'ascii', 'txt'


        function parseDataAsText(data, start, end) {
          var number = '';
          start = start || 0;
          end = end || data.length;
          var value; //length of the result is the product of the sizes

          var lengthOfTheResult = headerObject.sizes.reduce(function (previous, current) {
            return previous * current;
          }, 1);
          var base = 10;

          if (headerObject.encoding === 'hex') {
            base = 16;
          }

          var result = new headerObject.__array(lengthOfTheResult);
          var resultIndex = 0;
          var parsingFunction = parseInt;

          if (headerObject.__array === Float32Array || headerObject.__array === Float64Array) {
            parsingFunction = parseFloat;
          }

          for (var _i3 = start; _i3 < end; _i3++) {
            value = data[_i3]; //if value is not a space

            if ((value < 9 || value > 13) && value !== 32) {
              number += String.fromCharCode(value);
            } else {
              if (number !== '') {
                result[resultIndex] = parsingFunction(number, base);
                resultIndex++;
              }

              number = '';
            }
          }

          if (number !== '') {
            result[resultIndex] = parsingFunction(number, base);
            resultIndex++;
          }

          return result;
        }

        var _bytes = scan('uchar', data.byteLength);

        var _length = _bytes.length;
        var _header = null;
        var _data_start = 0;
        var i;

        for (i = 1; i < _length; i++) {
          if (_bytes[i - 1] == 10 && _bytes[i] == 10) {
            // we found two line breaks in a row
            // now we know what the header is
            _header = this.parseChars(_bytes, 0, i - 2); // this is were the data starts

            _data_start = i + 1;
            break;
          }
        } // parse the header


        parseHeader(_header);
        _data = _bytes.subarray(_data_start); // the data without header

        if (headerObject.encoding.substring(0, 2) === 'gz') {
          // we need to decompress the datastream
          // here we start the unzipping and get a typed Uint8Array back
          _data = fflate.gunzipSync(new Uint8Array(_data)); // eslint-disable-line no-undef
        } else if (headerObject.encoding === 'ascii' || headerObject.encoding === 'text' || headerObject.encoding === 'txt' || headerObject.encoding === 'hex') {
          _data = parseDataAsText(_data);
        } else if (headerObject.encoding === 'raw') {
          //we need to copy the array to create a new array buffer, else we retrieve the original arraybuffer with the header
          var _copy = new Uint8Array(_data.length);

          for (var _i4 = 0; _i4 < _data.length; _i4++) {
            _copy[_i4] = _data[_i4];
          }

          _data = _copy;
        } // .. let's use the underlying array buffer


        _data = _data.buffer;
        var volume = new _Volume.Volume();
        volume.header = headerObject; //
        // parse the (unzipped) data to a datastream of the correct type
        //

        volume.data = new headerObject.__array(_data); // get the min and max intensities

        var min_max = volume.computeMinMax();
        var min = min_max[0];
        var max = min_max[1]; // attach the scalar range to the volume

        volume.windowLow = min;
        volume.windowHigh = max; // get the image dimensions

        volume.dimensions = [headerObject.sizes[0], headerObject.sizes[1], headerObject.sizes[2]];
        volume.xLength = volume.dimensions[0];
        volume.yLength = volume.dimensions[1];
        volume.zLength = volume.dimensions[2]; // Identify axis order in the space-directions matrix from the header if possible.

        if (headerObject.vectors) {
          var xIndex = headerObject.vectors.findIndex(function (vector) {
            return vector[0] !== 0;
          });
          var yIndex = headerObject.vectors.findIndex(function (vector) {
            return vector[1] !== 0;
          });
          var zIndex = headerObject.vectors.findIndex(function (vector) {
            return vector[2] !== 0;
          });
          var axisOrder = [];
          axisOrder[xIndex] = 'x';
          axisOrder[yIndex] = 'y';
          axisOrder[zIndex] = 'z';
          volume.axisOrder = axisOrder;
        } else {
          volume.axisOrder = ['x', 'y', 'z'];
        } // spacing


        var spacingX = new _three.Vector3().fromArray(headerObject.vectors[0]).length();
        var spacingY = new _three.Vector3().fromArray(headerObject.vectors[1]).length();
        var spacingZ = new _three.Vector3().fromArray(headerObject.vectors[2]).length();
        volume.spacing = [spacingX, spacingY, spacingZ]; // Create IJKtoRAS matrix

        volume.matrix = new _three.Matrix4();
        var transitionMatrix = new _three.Matrix4();

        if (headerObject.space === 'left-posterior-superior') {
          transitionMatrix.set(-1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
        } else if (headerObject.space === 'left-anterior-superior') {
          transitionMatrix.set(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1);
        }

        if (!headerObject.vectors) {
          volume.matrix.set(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
        } else {
          var v = headerObject.vectors;
          var ijk_to_transition = new _three.Matrix4().set(v[0][0], v[1][0], v[2][0], 0, v[0][1], v[1][1], v[2][1], 0, v[0][2], v[1][2], v[2][2], 0, 0, 0, 0, 1);
          var transition_to_ras = new _three.Matrix4().multiplyMatrices(ijk_to_transition, transitionMatrix);
          volume.matrix = transition_to_ras;
        }

        volume.inverseMatrix = new _three.Matrix4();
        volume.inverseMatrix.copy(volume.matrix).invert();
        volume.RASDimensions = new _three.Vector3(volume.xLength, volume.yLength, volume.zLength).applyMatrix4(volume.matrix).round().toArray().map(Math.abs); // .. and set the default threshold
        // only if the threshold was not already set

        if (volume.lowerThreshold === -Infinity) {
          volume.lowerThreshold = min;
        }

        if (volume.upperThreshold === Infinity) {
          volume.upperThreshold = max;
        }

        return volume;
      }
    }, {
      key: "parseChars",
      value: function parseChars(array, start, end) {
        // without borders, use the whole array
        if (start === undefined) {
          start = 0;
        }

        if (end === undefined) {
          end = array.length;
        }

        var output = ''; // create and append the chars

        var i = 0;

        for (i = start; i < end; ++i) {
          output += String.fromCharCode(array[i]);
        }

        return output;
      }
    }]);

    return NRRDLoader;
  }(_three.Loader);

  _exports.NRRDLoader = NRRDLoader;
  var _fieldFunctions = {
    type: function type(data) {
      switch (data) {
        case 'uchar':
        case 'unsigned char':
        case 'uint8':
        case 'uint8_t':
          this.__array = Uint8Array;
          break;

        case 'signed char':
        case 'int8':
        case 'int8_t':
          this.__array = Int8Array;
          break;

        case 'short':
        case 'short int':
        case 'signed short':
        case 'signed short int':
        case 'int16':
        case 'int16_t':
          this.__array = Int16Array;
          break;

        case 'ushort':
        case 'unsigned short':
        case 'unsigned short int':
        case 'uint16':
        case 'uint16_t':
          this.__array = Uint16Array;
          break;

        case 'int':
        case 'signed int':
        case 'int32':
        case 'int32_t':
          this.__array = Int32Array;
          break;

        case 'uint':
        case 'unsigned int':
        case 'uint32':
        case 'uint32_t':
          this.__array = Uint32Array;
          break;

        case 'float':
          this.__array = Float32Array;
          break;

        case 'double':
          this.__array = Float64Array;
          break;

        default:
          throw new Error('Unsupported NRRD data type: ' + data);
      }

      return this.type = data;
    },
    endian: function endian(data) {
      return this.endian = data;
    },
    encoding: function encoding(data) {
      return this.encoding = data;
    },
    dimension: function dimension(data) {
      return this.dim = parseInt(data, 10);
    },
    sizes: function sizes(data) {
      var i;
      return this.sizes = function () {
        var _ref = data.split(/\s+/);

        var _results = [];

        for (var _i = 0, _len = _ref.length; _i < _len; _i++) {
          i = _ref[_i];

          _results.push(parseInt(i, 10));
        }

        return _results;
      }();
    },
    space: function space(data) {
      return this.space = data;
    },
    'space origin': function spaceOrigin(data) {
      return this.space_origin = data.split('(')[1].split(')')[0].split(',');
    },
    'space directions': function spaceDirections(data) {
      var f, v;
      var parts = data.match(/\(.*?\)/g);
      return this.vectors = function () {
        var _results = [];

        for (var _i = 0, _len = parts.length; _i < _len; _i++) {
          v = parts[_i];

          _results.push(function () {
            var _ref = v.slice(1, -1).split(/,/);

            var _results2 = [];

            for (var _j = 0, _len2 = _ref.length; _j < _len2; _j++) {
              f = _ref[_j];

              _results2.push(parseFloat(f));
            }

            return _results2;
          }());
        }

        return _results;
      }();
    },
    spacings: function spacings(data) {
      var f;
      var parts = data.split(/\s+/);
      return this.spacings = function () {
        var _results = [];

        for (var _i = 0, _len = parts.length; _i < _len; _i++) {
          f = parts[_i];

          _results.push(parseFloat(f));
        }

        return _results;
      }();
    }
  };
});