/*! leaflet-wfst 2.0.1-beta.20 2018-03-15 */
(function(window, document, undefined) {

"use strict";

L.XmlUtil = {
  namespaces: {
    xlink: 'http://www.w3.org/1999/xlink',
    xmlns: 'http://www.w3.org/2000/xmlns/',
    xsd: 'http://www.w3.org/2001/XMLSchema',
    xsi: 'http://www.w3.org/2001/XMLSchema-instance',
    wfs: 'http://www.opengis.net/wfs',
    gml: 'http://www.opengis.net/gml',
    ogc: 'http://www.opengis.net/ogc',
    ows: 'http://www.opengis.net/ows'
  },

  // TODO: find another way to create a new document with doctype text/xml?
  xmldoc: (new DOMParser()).parseFromString('<root />', 'text/xml'),

  setAttributes: function (node, attributes) {
    for (var name in attributes) {
      if (attributes[name] != null && attributes[name].toString) {
        var value = attributes[name].toString();
        var uri = this.namespaces[name.substring(0, name.indexOf(':'))] || null;
        node.setAttributeNS(uri, name, value);
      }
    }
  },

  evaluate: function (xpath, xml) {
    var xmlDoc = xml;
    if (!(xmlDoc instanceof Document)) {
      xmlDoc = this.parseXml(xml);
    }

    var xpe = new XPathEvaluator();
    var nsResolver = xpe.createNSResolver(xmlDoc.documentElement);

    return xpe.evaluate(xpath, xmlDoc, nsResolver, XPathResult.ANY_TYPE, null);
  },

  createElementNS: function (name, attributes, options) {
    options = options || {};

    var uri = options.uri;

    if (!uri) {
      uri = this.namespaces[name.substring(0, name.indexOf(':'))];
    }

    if (!uri) {
      uri = this.namespaces[options.prefix];
    }

    var node = uri ? this.xmldoc.createElementNS(uri, name) : this.xmldoc.createElement(name);

    if (attributes) {
      this.setAttributes(node, attributes);
    }

    if (options.value != null) {
      node.appendChild(this.xmldoc.createTextNode(options.value));
    }

    return node;
  },

  createTextNode: function (value) {
    if(value === null || value === undefined) {
      value = '';
    } else if(value instanceof Date) {
      value = value.toISOString();
    }

    return this.xmldoc.createTextNode(value);
  },

  getNodeText: function (node) {
    if (!node) {
      return '';
    }

    return node.innerText || node.textContent || node.text;
  },

  serializeXmlDocumentString: function (node) {
    var doc = document.implementation.createDocument('', '', null);
    doc.appendChild(node);
    var serializer = new XMLSerializer();
    return serializer.serializeToString(doc);
  },

  serializeXmlToString: function (node) {
    var serializer = new XMLSerializer();
    return serializer.serializeToString(node);
  },

  parseXml: function (rawXml) {
    if (typeof window.DOMParser !== 'undefined') {
      return (new window.DOMParser()).parseFromString(rawXml, 'text/xml');
    } else if (typeof window.ActiveXObject !== 'undefined' && new window.ActiveXObject('Microsoft.XMLDOM')) {
      var xmlDoc = new window.ActiveXObject('Microsoft.XMLDOM');
      xmlDoc.async = 'false';
      xmlDoc.loadXML(rawXml);
      return xmlDoc;
    } else {
      throw new Error('No XML parser found');
    }
  },

  parseOwsExceptionReport: function (xml) {
    var xmlDoc = xml;
    if (!(xmlDoc instanceof Document)) {
      xmlDoc = this.parseXml(xml);
    }

    var exceptionReportElement = xmlDoc.documentElement;
    if (!exceptionReportElement || exceptionReportElement.tagName !== 'ows:ExceptionReport') {
      return null;
    }

    var exceptionReport = {
      exceptions: [],
      message: ''
    };

    var exceptionsNodes = exceptionReportElement.getElementsByTagNameNS(L.XmlUtil.namespaces.ows, 'Exception');
    for (var i = 0, exceptionsNodesCount = exceptionsNodes.length; i < exceptionsNodesCount; i++) {
      var exceptionNode = exceptionsNodes[i];
      var exceptionCode = exceptionNode.getAttribute('exceptionCode');
      var exceptionsTextNodes = exceptionNode.getElementsByTagNameNS(L.XmlUtil.namespaces.ows, 'ExceptionText');
      var exception = {
        code: exceptionCode,
        text: ''
      };

      for (var j = 0, textNodesCount = exceptionsTextNodes.length; j < textNodesCount; j++) {
        var exceptionTextNode = exceptionsTextNodes[j];
        var exceptionText = exceptionTextNode.innerText || exceptionTextNode.textContent || exceptionTextNode.text;

        exception.text += exceptionText;
        if (j < textNodesCount - 1) {
          exception.text += '. ';
        }
      }

      exceptionReport.message += exception.code + ' - ' + exception.text;
      if (i < exceptionsNodesCount - 1) {
        exceptionReport.message += ' ';
      }

      exceptionReport.exceptions.push(exception);
    }

    return exceptionReport;
  }
};

L.Util.request = function (options) {
  options = L.extend({
    async: true,
    method: 'POST',
    data: '',
    params: {},
    headers: {},
    url: window.location.href,
    withCredentials: false,
    success: function (data) {
      console.log(data);
    },
    error: function (data) {
      console.log('Ajax request fail');
      console.log(data);
    },
    complete: function () {
    }
  }, options);

  // good bye IE 6,7
  var xhr = new XMLHttpRequest();

  xhr.onreadystatechange = function () {
    if (xhr.readyState === 4) {
      if (xhr.status === 200) {
        options.success(xhr.responseText);
      } else {
        options.error(xhr.responseText);
      }
      options.complete();
    }
  };
  xhr.withCredentials = options.withCredentials;

  var url = options.url + L.Util.getParamString(options.params, options.url);

  xhr.open(options.method, url, options.async);
  for (var header in options.headers) {
    xhr.setRequestHeader(header, options.headers[header]);
  }

  xhr.send(options.data);
};

L.Filter = {};

L.filter = function (filters) {
  var result = L.XmlUtil.createElementNS('ogc:Filter');

  if (Array.isArray(filters)) {
    filters.forEach(function (element) {
      result.appendChild(element instanceof Element ? element : element.toGml());
    });
  } else if (filters) {
    result.appendChild(filters instanceof Element ? filters : filters.toGml());
  }

  return result;
};

L.Filter.propertyName = function (value) {
  return L.XmlUtil.createElementNS('ogc:PropertyName', {}, { value: value });
};

L.Filter.literal = function (value) {
  return L.XmlUtil.createElementNS('ogc:Literal', {}, { value: value });
};

L.Filter.element = function(value) {
  if(value instanceof Element) {
    return value;
  }

  return value.toGml();
};

L.Filter.propertyElement = function (value) {
  if (value instanceof Element) {
    return value;
  }

  if (value && typeof (value.toGml) === "function") {
    return value.toGml();
  }

  return L.Filter.propertyName(value);
};

L.Filter.literalElement = function (value) {
  if (value instanceof Element) {
    return value;
  }

  if (value && typeof (value.toGml) === "function") {
    return value.toGml();
  }

  return L.Filter.literal(value);
};

L.Filter.Abstract = L.Class.extend({
  attributes: {},

  options: {},

  tagName: null,

  buildFilterContent: function() {
    throw "Build filter content is abstract and should be implemented";
  },

  toGml: function() {
    var filterElement = L.XmlUtil.createElementNS(this.tagName, this.attributes, this.options);
    this.buildFilterContent(filterElement);
    return filterElement;
  }
});

L.Filter.BinarySpatial = L.Filter.Abstract.extend({
  initialize: function (propertyName, value, crs) {
    this.propertyName = propertyName;
    this.value = value;
    this.crs = crs;
  },

  buildFilterContent: function (filterElement) {
    filterElement.appendChild(L.Filter.propertyName(this.propertyName));
    if (typeof(this.value) === "string") {
      filterElement.appendChild(L.Filter.propertyName(this.value));
    } else {
      filterElement.appendChild(this.value.toGml(this.crs));
    }
    return filterElement;
  }
});

L.Filter.Equals = L.Filter.BinarySpatial.extend({
  tagName: 'ogc:Equals'
});

L.Filter.equals = function(options) {
  return new L.Filter.Equals(options);
};

L.Filter.Disjoint = L.Filter.BinarySpatial.extend({
  tagName: 'ogc:Disjoint'
});

L.Filter.disjoint = function(options) {
  return new L.Filter.Disjoint(options);
};

L.Filter.Touches = L.Filter.BinarySpatial.extend({
  tagName: 'ogc:Touches'
});

L.Filter.touches = function(options) {
  return new L.Filter.Touches(options);
};

L.Filter.Within = L.Filter.BinarySpatial.extend({
  tagName: 'ogc:Within'
});

L.Filter.within = function(options) {
  return new L.Filter.Within(options);
};

L.Filter.Overlaps = L.Filter.BinarySpatial.extend({
  tagName: 'ogc:Overlaps'
});

L.Filter.overlaps = function(options) {
  return new L.Filter.Overlaps(options);
};

L.Filter.Crosses = L.Filter.BinarySpatial.extend({
  tagName: 'ogc:Crosses'
});

L.Filter.crosses = function(options) {
  return new L.Filter.Crosses(options);
};

L.Filter.Intersects = L.Filter.BinarySpatial.extend({
  tagName: 'ogc:Intersects'
});

L.Filter.intersects = function(options) {
  return new L.Filter.Intersects(options);
};

L.Filter.Contains = L.Filter.BinarySpatial.extend({
  tagName: 'ogc:Contains'
});

L.Filter.contains = function(options) {
  return new L.Filter.Contains(options);
};

L.Filter.DistanceBuffer = L.Filter.Abstract.extend({
  initialize: function (propertyName, geometry, crs, distance, units) {
    this.propertyName = propertyName;
    this.geomerty = geometry;
    this.crs = crs;
    this.distance = distance;
    this.units = units;
  },

  buildFilterContent: function (filterElement) {
    filterElement.appendChild(L.Filter.propertyName(this.propertyName));
    filterElement.appendChild(this.geomerty.toGml(this.crs));
    filterElement.appendChild(L.XmlUtil.createElementNS('ogc:Distance', { 'units': this.units }, { value: this.distance }));
  }
});

L.Filter.DWithin = L.Filter.DistanceBuffer.extend({
  tagName: 'ogc:DWithin'
});

L.Filter.dwithin = function(propertyName, geometry, crs, distance, units) {
  return new L.Filter.DWithin(propertyName, geometry, crs, distance, units);
};

L.Filter.Beyond = L.Filter.DistanceBuffer.extend({
  tagName: 'ogc:Beyond'
});

L.Filter.beyond = function(propertyName, geometry, crs, distance, units) {
  return new L.Filter.Beyond(propertyName, geometry, crs, distance, units);
};

L.Filter.BBox = L.Filter.Abstract.extend({
  tagName: 'ogc:BBOX',

  geometryField: null,

  bbox: null,

  crs: null,

  initialize: function (geometryField, bbox, crs) {
    this.bbox = bbox;
    this.geometryField = geometryField;
    this.crs = crs;
  },

  buildFilterContent: function (filterElement) {
    if (this.geometryField) {
      filterElement.appendChild(L.Filter.propertyName(this.geometryField));
    }

    filterElement.appendChild(this.bbox.toGml(this.crs));
  }
});

L.Filter.bbox = function (geometryField, bbox, crs) {
  return new L.Filter.BBox(geometryField, bbox, crs);
};

L.Filter.GmlObjectID = L.Filter.Abstract.extend({
  tagName: 'ogc:GmlObjectId',

  initialize: function (id) {
    this.attributes =  { 'gml:id': id };
  },

  buildFilterContent: function() {
  }
});

L.Filter.gmlobjectid = function(id) {
  return new L.Filter.GmlObjectID(id);
};

L.Filter.BinaryOperator = L.Filter.Abstract.extend({
  initialize: function (firstValue, secondValue) {
    this.firstValue = firstValue;
    this.secondValue = secondValue;
  },

  buildFilterContent: function (filterElement) {
    filterElement.appendChild(L.Filter.propertyElement(this.firstValue));
    filterElement.appendChild(L.Filter.literalElement(this.secondValue));
  }
});

L.Filter.Add = L.Filter.BinaryOperator.extend({
  tagName: 'Add'
});

L.Filter.add = function(a, b) {
  return new L.Filter.Add(a, b);
};

L.Filter.Sub = L.Filter.BinaryOperator.extend({
  tagName: 'Sub'
});

L.Filter.sub = function(a, b) {
  return new L.Filter.Sub(a, b);
};

L.Filter.Mul = L.Filter.BinaryOperator.extend({
  tagName: 'Mul'
});

L.Filter.mul = function(a, b) {
  return new L.Filter.Mul(a, b);
};

L.Filter.Div = L.Filter.BinaryOperator.extend({
  tagName: 'Div'
});

L.Filter.div = function(a, b) {
  return new L.Filter.Div(a, b);
};

L.Filter.BinaryComparison = L.Filter.BinaryOperator.extend({
  matchCase: false,

  initialize: function(firstValue, secondValue, matchCase) {
    L.Filter.BinaryOperator.prototype.initialize.call(this, firstValue, secondValue);
    this.attributes = { matchCase: !!matchCase };
  }
});

L.Filter.EQ = L.Filter.BinaryComparison.extend({
  tagName: 'ogc:PropertyIsEqualTo'
});

L.Filter.eq = function(firstValue, secondValue) {
  return new L.Filter.EQ(firstValue, secondValue);
};

L.Filter.NotEQ = L.Filter.BinaryComparison.extend({
  tagName: 'ogc:PropertyIsNotEqualTo'
});

L.Filter.neq = function(firstValue, secondValue) {
  return new L.Filter.NotEQ(firstValue, secondValue);
};

L.Filter.LT = L.Filter.BinaryComparison.extend({
  tagName: 'ogc:PropertyIsLessThan'
});

L.Filter.lt = function(firstValue, secondValue) {
  return new L.Filter.LT(firstValue, secondValue);
};

L.Filter.GT = L.Filter.BinaryComparison.extend({
  tagName: 'ogc:PropertyIsGreaterThan'
});

L.Filter.gt = function(firstValue, secondValue) {
  return new L.Filter.GT(firstValue, secondValue);
};

L.Filter.LEQ = L.Filter.BinaryComparison.extend({
  tagName: 'ogc:PropertyIsLessThanOrEqualTo'
});

L.Filter.leq = function(firstValue, secondValue) {
  return new L.Filter.LEQ(firstValue, secondValue);
};

L.Filter.GEQ = L.Filter.BinaryComparison.extend({
  tagName: 'ogc:PropertyIsGreaterThanOrEqualTo'
});

L.Filter.geq = function(firstValue, secondValue) {
  return new L.Filter.GEQ(firstValue, secondValue);
};

L.Filter.Like = L.Filter.Abstract.extend({
  tagName: 'ogc:PropertyIsLike',

  wildCard: '*',
  singleChar: '#',
  escapeChar: '!',
  matchCase: true,

  initialize: function (name, val, attributes) {
    this.name = name;
    this.val = val;
    var defaultAttributes = { wildCard: this.wildCard, singleChar: this.singleChar, escapeChar: this.escapeChar, matchCase: this.matchCase };
    this.attributes = L.extend(defaultAttributes, attributes || {});
  },

  buildFilterContent: function (filterElement) {
    var nameElement = L.Filter.propertyName(this.name);
    var valueElement = L.Filter.literal(this.val);
    filterElement.appendChild(nameElement);
    filterElement.appendChild(valueElement);
    return filterElement;
  }
});

L.Filter.like = function(name, val, attributes) {
  return new L.Filter.Like(name, val, attributes);
};

L.Filter.IsNull = L.Filter.Abstract.extend({
  tagName: 'ogc:PropertyIsNull',

  initialize: function (propertyName) {
    this.propertyName = propertyName;
  },

  buildFilterContent: function (filterElement) {
    filterElement.appendChild(L.Filter.propertyName(this.propertyName));
  }
});

L.Filter.isnull = function(propertyName) {
  return new L.Filter.IsNull(propertyName);
};

L.Filter.IsBetween = L.Filter.Abstract.extend({
  tagName: 'ogc:PropertyIsBetween',

  initialize: function (property, lowerBoundary, upperBoundary) {
    this.property = property;
    this.lowerBoundary = lowerBoundary;
    this.upperBoundary = upperBoundary;
  },

  buildFilterContent: function (filterElement) {
    filterElement.appendChild(L.Filter.propertyElement(this.property));

    var lowerBoundaryElement = L.XmlUtil.createElementNS('ogc:LowerBoundary');
    lowerBoundaryElement.appendChild(L.Filter.literalElement(this.lowerBoundary));

    filterElement.appendChild(lowerBoundaryElement);

    var upperBoundaryElement = L.XmlUtil.createElementNS('ogc:UpperBoundary');
    upperBoundaryElement.appendChild(L.Filter.literalElement(this.upperBoundary));

    filterElement.appendChild(upperBoundaryElement);
  }
});

L.Filter.isbetween = function(property, lowerBoundary, upperBoundary) {
  return new L.Filter.IsBetween(property, lowerBoundary, upperBoundary);
};

L.Filter.BinaryLogic = L.Filter.Abstract.extend({
  filters: null,

  initialize: function () {
    var filters = [];
    for (var i = 0; i < arguments.length; i++) {
      filters.push(arguments[i]);
    }

    this.filters = filters;
  },

  buildFilterContent: function (filterElement) {
    this.filters.forEach(function(filter) {
      filterElement.appendChild(L.Filter.element(filter));
    });
  }
});

L.Filter.And = L.Filter.BinaryLogic.extend({
  tagName: 'And'
});

L.Filter.and = function() {
  return new (Function.prototype.bind.apply(L.Filter.And, arguments))();
};

L.Filter.Or = L.Filter.BinaryLogic.extend({
  tagName: 'Or'
});

L.Filter.or = function() {
  return new (Function.prototype.bind.apply(L.Filter.Or, arguments))();
};

L.Filter.Not = L.Filter.Abstract.extend({
  tagName: 'Not',

  initialize: function(filter) {
    this.filter = filter;
  },

  buildFilterContent: function(filterElement) {
    filterElement.appendChild(L.Filter.element(this.filter));
  }
});

L.Filter.not = function(filter) {
  return new L.Filter.Not(filter);
};

L.Filter.Function = L.Filter.Abstract.extend({
  tagName: 'Function',

  initialize: function () {
    var functionName = arguments[0];
    this.attributes = { name: functionName };
    var expressions = [];
    for (var i = 1; i < arguments.length; i++) {
      expressions.push(arguments[i]);
    }

    this.expressions = expressions;
  },

  buildFilterContent: function (filterElement) {
    var firstArgument = this.expressions[0];
    filterElement.appendChild(L.Filter.propertyElement(firstArgument));

    for (var i = 1; i < this.expressions.length; i++) {
      var functionArgument = this.expressions[i];
      filterElement.appendChild(L.Filter.literalElement(functionArgument));
    }
  }
});

L.Filter.function = function() {
  return new (Function.prototype.bind.apply(L.Filter.Function, arguments))();
};

L.Format = {};

L.Format.Scheme = L.Class.extend({
  options: {
    geometryField: 'Shape',
  },

  initialize: function (options) {
    L.setOptions(this, options);
  },

  parse: function (element) {
    var featureType = new L.GML.FeatureType({
      geometryField: this.options.geometryField
    });
    var complexTypeDefinition = element.getElementsByTagNameNS(L.XmlUtil.namespaces.xsd, 'complexType')[0];
    var properties = complexTypeDefinition.getElementsByTagNameNS(L.XmlUtil.namespaces.xsd, 'sequence')[0];
    for (var i = 0; i < properties.childNodes.length; i++) {
      var node = properties.childNodes[i];
      if (node.nodeType !== document.ELEMENT_NODE) {
        continue;
      }

      var propertyAttr = node.attributes.name;
      if (!propertyAttr) {
        continue;
      }

      var propertyName = node.attributes.name.value;

      var typeAttr = node.attributes.type;
      if (!typeAttr) {
        var restriction = node.getElementsByTagNameNS(L.XmlUtil.namespaces.xsd, 'restriction');
        typeAttr = restriction.attributes.base;
      }

      if (!typeAttr) {
        continue;
      }

      var typeName = typeAttr.value.split(':').pop();

      if (propertyName === this.options.geometryField) {
        featureType.geometryFields[propertyName] = typeName;
        continue;
      }

      featureType.appendField(propertyName, typeName);
    }

    return featureType;
  }
});

L.Format.Base = L.Class.extend({
  defaultOptions: {
    crs: L.CRS.EPSG3857,
    coordsToLatLng: function (coords) {
      return new L.LatLng(coords[1], coords[0], coords[2]);
    },
    latLngToCoords: function (latlng) {
      var coords = [latlng.lng, latlng.lat];
      if (latlng.alt !== undefined) {
        coords.push(latlng.alt);
      }
      return coords;
    },
    geometryField: 'Shape'
  },

  initialize: function (options) {
    L.setOptions(this, L.extend({}, this.defaultOptions, options));
    if (options.crs) {
      var crs = options.crs;
      this.options.coordsToLatLng = function (coords) {
        var point = L.point(coords[0], coords[1]);
        var ll = crs.projection.unproject(point);
        if (coords[2]) {
          ll.alt = coords[2];
        }
        return ll;
      };
      this.options.latLngToCoords = function (ll) {
        var latLng = L.latLng(ll);
        return crs.projection.project(latLng);
      };
    }
  },

  setFeatureDescription: function (featureInfo) {
    this.namespaceUri = featureInfo.attributes.targetNamespace.value;
    var schemeParser = new L.Format.Scheme({
      geometryField: this.options.geometryField
    });
    this.featureType = schemeParser.parse(featureInfo);
  }
});

L.Format.GeoJSON = L.Format.Base.extend({

  initialize: function (options) {
    L.Format.Base.prototype.initialize.call(this, options);
    this.outputFormat = 'application/json';
  },

  responseToLayers: function (rawData) {
    var layers = [];
    var geoJson = JSON.parse(rawData);

    for (var i = 0; i < geoJson.features.length; i++) {
      var layer = this.processFeature(geoJson.features[i]);
      if (layer) {
        layers.push(layer);
      }
    }

    return layers;
  },

  processFeature: function (feature) {
    var layer = this.generateLayer(feature);
    if (!layer) {
      return null;
    }

    layer.feature = feature;
    return layer;
  },

  generateLayer: function (feature) {
    var layer = L.GeoJSON.geometryToLayer(feature, this.options || null);
    if (!layer) {
      console.log(
        'Geometry field doesn\' exist inside received feature: \'' + feature + '\', ' +
        'so feature will be skipped and won\'t be converted into leaflet layer');

        return null;
    }

    return layer;
  }
});

L.GML = L.GML || {};

L.GML.ParserContainerMixin = {

  parsers: {},

  initializeParserContainer: function () {
    this.parsers = {};
  },

  appendParser: function (parser) {
    this.parsers[parser.elementTag] = parser;
  },

  parseElement: function (element, options) {
    var parser = this.parsers[element.tagName];
    if (!parser) throw('unknown child element ' + element.tagName);

    return parser.parse(element, options);
  }
};

L.GML.Element = L.Class.extend({
  elementTag: '',
  parse: function () {
    throw('not implemented parse function in parser for ' + this.elementTag);
  }
});

L.GML.Geometry = L.GML.Element.extend({
  statics: {
    DIM: 2
  },

  dimensions: function (element) {
    if (element.attributes.srsDimension) {
      return parseInt(element.attributes.srsDimension.value);
    }

    return L.GML.Geometry.DIM;
  }
});

L.GML.Coordinates = L.GML.Element.extend({

  defaultSeparator: {
    ds: '.', //decimal separator
    cs: ',', // component separator
    ts: ' ' // tuple separator
  },

  initialize: function () {
    this.elementTag = 'gml:coordinates';
  },

  parse: function (element) {

    var ds = this.defaultSeparator.ds;
    if (element.attributes.decimal) {
      ds = element.attributes.decimal.value;
    }

    var cs = this.defaultSeparator.cs;
    if (element.attributes.cs) {
      cs = element.attributes.cs.value;
    }

    var ts = this.defaultSeparator.ts;
    if (element.attributes.ts) {
      ts = element.attributes.ts.value;
    }

    var result = [];
    var coords = element.textContent.split(ts);

    var mapFunction = function (coord) {
      if (ds !== '.') {
        coord = coord.replace(ds, '.');
      }

      return parseFloat(coord);
    };

    for (var i = 0; i < coords.length; i++) {
      result.push(coords[i].split(cs).map(mapFunction));
    }

    if (result.length === 1) {
      return result[0];
    }

    return result;
  }
});

L.GML.Pos = L.GML.Element.extend({
  initialize: function () {
    this.elementTag = 'gml:pos';
  },

  parse: function (element) {
    return element.textContent.split(' ').map(function (coord) {
      return parseFloat(coord);
    });
  }
});

L.GML.PosList = L.GML.Element.extend({
  initialize: function () {
    this.elementTag = 'gml:posList';
  },

  parse: function (element, options) {
    var result = [];
    var dim = options.dimensions;
    var coords = element.textContent.split(' ');
    for (var i = 0; i < coords.length; i += dim) {
      var coord = [];
      for (var j = i; j < i + dim; j++) {
        coord.push(parseFloat(coords[j]));
      }
      result.push(coord);
    }

    return result;
  }
});

L.GML.PointNode = L.GML.Geometry.extend({
  includes: L.GML.ParserContainerMixin,

  initialize: function () {
    this.elementTag = 'gml:Point';
    this.initializeParserContainer();
    this.appendParser(new L.GML.Pos());
    this.appendParser(new L.GML.Coordinates());
  },

  parse: function (element) {
    return this.parseElement(element.firstChild, {dimensions: this.dimensions(element)});
  }
});

L.GML.PointSequence = L.GML.Geometry.extend({
  includes: L.GML.ParserContainerMixin,

  initialize: function () {
    this.initializeParserContainer();
    this.appendParser(new L.GML.Pos());
    this.appendParser(new L.GML.PosList());
    this.appendParser(new L.GML.Coordinates());
    this.appendParser(new L.GML.PointNode());
  },

  parse: function (element) {
    var firstChild = element.firstChild;
    var coords = [];
    var tagName = firstChild.tagName;
    if (tagName === 'gml:pos' || tagName === 'gml:Point') {
      var childParser = this.parsers[tagName];
      var elements = element.getElementsByTagNameNS(L.XmlUtil.namespaces.gml, tagName.split(':').pop());
      for (var i = 0; i < elements.length; i++) {
        coords.push(childParser.parse(elements[i]));
      }
    }
    else {
      coords = this.parseElement(firstChild, {dimensions: this.dimensions(element)});
    }

    return coords;
  }
});

L.GML.LinearRing = L.GML.PointSequence.extend({
  initialize: function () {
    L.GML.PointSequence.prototype.initialize.call(this);
    this.elementTag = 'gml:LinearRing';
  },

  parse: function (element) {
    var coords = L.GML.PointSequence.prototype.parse.call(this, element);
    //for leaflet polygons its not recommended insert additional last point equal to the first one
    coords.pop();
    return coords;
  }
});

L.GML.LineStringNode = L.GML.PointSequence.extend({
  initialize: function () {
    this.elementTag = 'gml:LineString';
    L.GML.PointSequence.prototype.initialize.call(this);
  },

  parse: function (element) {
    return L.GML.PointSequence.prototype.parse.call(this, element);
  }
});

L.GML.PolygonNode = L.GML.Geometry.extend({

  initialize: function () {
    this.elementTag = 'gml:Polygon';
    this.linearRingParser = new L.GML.LinearRing();
  },

  parse: function (element) {
    var coords = [];
    for (var i = 0; i < element.childNodes.length; i++) {
      //there can be exterior and interior, by GML standard and for leaflet its not significant
      var child = element.childNodes[i];
      if (child.nodeType === document.ELEMENT_NODE) {
        coords.push(this.linearRingParser.parse(child.firstChild));
      }
    }

    return coords;
  }
});

L.GML.CoordsToLatLngMixin = {
  transform: function (coordinates, options) {
    if (Array.isArray(coordinates[0])) {
      var latLngs = [];
      for (var i = 0; i < coordinates.length; i++) {
        latLngs.push(this.transform(coordinates[i], options));
      }

      return latLngs;
    }

    return options.coordsToLatLng(coordinates);
  }
};

L.GML.Point = L.GML.PointNode.extend({
  includes: L.GML.CoordsToLatLngMixin,

  parse: function (element, options) {
    var coords = L.GML.PointNode.prototype.parse.call(this, element);
    var layer = new L.Marker();
    layer.setLatLng(this.transform(coords, options));
    return layer;
  }
});

L.GML.LineString = L.GML.LineStringNode.extend({

  includes: L.GML.CoordsToLatLngMixin,

  parse: function (element, options) {
    var layer = new L.Polyline([]);
    var coordinates = L.GML.LineStringNode.prototype.parse.call(this, element);
    layer.setLatLngs(this.transform(coordinates, options));
    return layer;
  }
});

L.GML.Polygon = L.GML.PolygonNode.extend({

  includes: L.GML.CoordsToLatLngMixin,

  parse: function (element, options) {
    var layer = new L.Polygon([]);
    var coordinates = L.GML.PolygonNode.prototype.parse.call(this, element);
    layer.setLatLngs(this.transform(coordinates, options));
    return layer;
  }
});

L.GML.MultiGeometry = L.GML.Geometry.extend({
  includes: [L.GML.ParserContainerMixin, L.GML.CoordsToLatLngMixin],

  initialize: function () {
    this.initializeParserContainer();
  },

  parse: function (element, options) {
    var childObjects = [];
    for (var i = 0; i < element.childNodes.length; i++) {
      var geometryMember = element.childNodes[i];
      if (geometryMember.nodeType !== document.ELEMENT_NODE) continue;

      for (var j = 0; j < geometryMember.childNodes.length; j++) {
        var singleGeometry = geometryMember.childNodes[j];
        if (singleGeometry.nodeType !== document.ELEMENT_NODE) continue;

        childObjects.push(this.parseElement(singleGeometry, options));
      }
    }

    return this.transform(childObjects, options);
  }
});

L.GML.AbstractMultiPolyline = L.GML.MultiGeometry.extend({

  initialize: function () {
    L.GML.MultiGeometry.prototype.initialize.call(this);
    this.appendParser(new L.GML.LineStringNode());
  },

  parse: function (element, options) {
    var latLngs = L.GML.MultiGeometry.prototype.parse.call(this, element, options);
    var layer = new L.Polyline([]);
    layer.setLatLngs(latLngs);
    return layer;
  }
});

L.GML.AbstractMultiPolygon = L.GML.MultiGeometry.extend({

  initialize: function () {
    L.GML.MultiGeometry.prototype.initialize.call(this);
    this.appendParser(new L.GML.PolygonNode());
  },

  parse: function (element, options) {
    var latLngs = L.GML.MultiGeometry.prototype.parse.call(this, element, options);
    var layer = new L.Polygon([]);
    layer.setLatLngs(latLngs);
    return layer;
  }
});

L.GML.MultiLineString = L.GML.AbstractMultiPolyline.extend({
  initialize: function () {
    L.GML.AbstractMultiPolyline.prototype.initialize.call(this);
    this.elementTag = 'gml:MultiLineString';
  }
});

L.GML.MultiCurve = L.GML.AbstractMultiPolyline.extend({
  initialize: function () {
    L.GML.AbstractMultiPolyline.prototype.initialize.call(this);
    this.elementTag = 'gml:MultiCurve';
  }
});

L.GML.MultiPolygon = L.GML.AbstractMultiPolygon.extend({
  initialize: function () {
    L.GML.AbstractMultiPolygon.prototype.initialize.call(this);
    this.elementTag = 'gml:MultiPolygon';
  }
});

L.GML.MultiSurface = L.GML.AbstractMultiPolygon.extend({
  initialize: function () {
    L.GML.AbstractMultiPolygon.prototype.initialize.call(this);
    this.elementTag = 'gml:MultiSurface';
  }
});

L.GML.MultiPoint = L.GML.MultiGeometry.extend({
  initialize: function () {
    L.GML.MultiGeometry.prototype.initialize.call(this);
    this.elementTag = 'gml:MultiPoint';
    this.appendParser(new L.GML.PointNode());
  },

  parse: function (element, options) {
    var coordinates = L.GML.MultiGeometry.prototype.parse.call(this, element, options);
    var multiPoint = new L.FeatureGroup();
    for (var i = 0; i < coordinates.length; i++) {
      var point = new L.Marker();
      point.setLatLng(coordinates[i]);
      multiPoint.addLayer(point);
    }

    return multiPoint;
  }
});

L.GML.FeatureType = L.Class.extend({
  options: {
    geometryField: 'Shape',
  },

  primitives: [
    {
      types: ['byte', 'short', 'int', 'integer', 'long', 'float', 'double', 'decimal'],
      parse: function (input) {
        if (input === 0) {
          return 0;
        }
        input = String.prototype.trim.call(input || '');
        return input === '' ? null : Number(input);
      },
      validate: function (parsedValue) {
        // Invalid number can be detected by isNaN check.
        return !isNaN(parsedValue);
      },
      type: 'number'
    },
    {
      types: ['string'],
      parse: function (input) {
        return input;
      },
      validate: function (parsedValue) {
        // Any value is valid for 'string' type.
        return true;
      },
      type: 'string'
    },
    {
      types: ['boolean'],
      parse: function (input) {
        input = String.prototype.trim.call(input || '').toLowerCase();
        return input !== 'false';
      },
      validate: function (parsedValue) {
        // Any value is valid for 'boolean' type if parser parses it like so: input !== 'false'.
        return true;
      },
      type: 'boolean'
    },
    {
      types: ['date', 'time', 'datetime'],
      parse: function (input) {
        input = String.prototype.trim.call(input || '');
        return input === '' ? null : new Date(input);
      },
      validate: function (parsedValue) {
        // Invalid date also can be detected by isNaN check.
        return !isNaN(parsedValue);
      },
      type: 'date'
    }
  ],

  initialize: function (options) {
    L.setOptions(this, options);

    this.fields = {};
    this.fieldValidators = {};
    this.fieldTypes = {};
    this.geometryFields = {};
  },

  appendField: function (name, type) {
    var that = this;
    type = String.prototype.toLowerCase.call(type || '');

    this.primitives.forEach(function (primitive) {
      if (primitive.types.indexOf(type) !== -1) {
        that.fields[name] = primitive.parse;
        that.fieldValidators[name] = primitive.validate;
        that.fieldTypes[name] = primitive.type;
      }
    });
  },

  parse: function (feature) {
    var properties = {};
    for (var i = 0; i < feature.childNodes.length; i++) {
      var node = feature.childNodes[i];
      if (node.nodeType !== document.ELEMENT_NODE) {
        continue;
      }

      var propertyName = node.tagName.split(':').pop();
      if (propertyName === this.options.geometryField) {
        continue;
      }

      var parseField = this.fields[propertyName];
      if (!parseField) {
        this.appendField(propertyName, 'string');
        parseField = this.fields[propertyName];
      }

      properties[propertyName] = parseField(node.textContent);
    }

    return {
      type: 'Feature',
      properties: properties,
      id: feature.attributes['gml:id'].value
    };
  }
});

L.Format.GML = L.Format.Base.extend({

  includes: L.GML.ParserContainerMixin,

  initialize: function (options) {
    L.Format.Base.prototype.initialize.call(this, options);
    this.outputFormat = 'text/xml; subtype=gml/3.1.1';
    this.initializeParserContainer();
    this.appendParser(new L.GML.Point());
    this.appendParser(new L.GML.LineString());
    this.appendParser(new L.GML.Polygon());
    this.appendParser(new L.GML.MultiLineString());
    this.appendParser(new L.GML.MultiPolygon());
    this.appendParser(new L.GML.MultiCurve());
    this.appendParser(new L.GML.MultiSurface());
    this.appendParser(new L.GML.MultiPoint());
  },

  responseToLayers: function (rawData) {
    var layers = [];
    var xmlDoc = L.XmlUtil.parseXml(rawData);
    var featureCollection = xmlDoc.documentElement;
    var featureMemberNodes = featureCollection.getElementsByTagNameNS(L.XmlUtil.namespaces.gml, 'featureMember');
    for (var i = 0; i < featureMemberNodes.length; i++) {
      var feature = featureMemberNodes[i].firstChild;
      var featureAsLayer = this.processFeature(feature);
      if (featureAsLayer) {
        layers.push(featureAsLayer);
      }
    }

    var featureMembersNode = featureCollection.getElementsByTagNameNS(L.XmlUtil.namespaces.gml, 'featureMembers');
    if (featureMembersNode.length > 0) {
      var features = featureMembersNode[0].childNodes;
      for (var j = 0; j < features.length; j++) {
        var node = features[j];
        if (node.nodeType !== document.ELEMENT_NODE) {
          continue;
        }

        var nodeAsLayer = this.processFeature(node);
        if (nodeAsLayer) {
          layers.push(nodeAsLayer);
        }
      }
    }

    return layers;
  },

  processFeature: function (feature) {
    var layer = this.generateLayer(feature);
    if (!layer) {
      return null;
    }

    layer.feature = this.featureType.parse(feature);
    return layer;
  },

  generateLayer: function (feature) {
    var geometryField = feature.getElementsByTagNameNS(this.namespaceUri, this.options.geometryField)[0];
    if (!geometryField) {
      console.log(
        'Geometry field \'' + this.options.geometryField + '\' doesn\' exist inside received feature: \'' + feature.innerHTML + '\', ' +
        'so feature will be skipped and won\'t be converted into leaflet layer');

      return null;
    }

    return this.parseElement(geometryField.firstChild, this.options);
  }
});

L.Util.project = function (crs, latlngs) {
  if (L.Util.isArray(latlngs)) {
    var result = [];
    latlngs.forEach(function (latlng) {
      result.push(L.Util.project(crs, latlng));
    });

    return result;
  } else {
    return crs.projection.project(latlngs);
  }
};

// 1.0.1 <=> 1.1.0 <=> 1.2.0 compatibility.
L.Util.isFlat = L.LineUtil.isFlat || L.LineUtil._flat || L.Polyline._flat;

L.GmlUtil = {
  posNode: function (coord) {
    return L.XmlUtil.createElementNS('gml:pos', { srsDimension: 2 }, { value: coord.x + ' ' + coord.y });
  },

  posListNode: function (coords, close) {
    var localcoords = [];
    coords.forEach(function (coord) {
      localcoords.push(coord.x + ' ' + coord.y);
    });
    if (close && coords.length > 0) {
      var coord = coords[0];
      localcoords.push(coord.x + ' ' + coord.y);
    }

    var posList = localcoords.join(' ');
    return L.XmlUtil.createElementNS('gml:posList', {}, { value: posList });
  }
};

L.CircleMarker.include({
  toGml: function(crs) {
    var node = L.XmlUtil.createElementNS('gml:Point', {srsName: crs.code});
    node.appendChild(L.GmlUtil.posNode(L.Util.project(crs, this.getLatLng())));
    return node;
  }
});

L.LatLngBounds.prototype.toGml = function (crs) {
  var projectedSW = crs.project(this.getSouthWest());
  var projectedNE = crs.project(this.getNorthEast());

  var envelopeElement = L.XmlUtil.createElementNS('gml:Envelope', { srsName: crs.code });
  envelopeElement.appendChild(L.XmlUtil.createElementNS('gml:lowerCorner', {}, { value: projectedSW.x + ' ' + projectedSW.y }));
  envelopeElement.appendChild(L.XmlUtil.createElementNS('gml:upperCorner', {}, { value: projectedNE.x + ' ' + projectedNE.y }));

  return envelopeElement;
};

L.Marker.include({
  toGml: function (crs) {
    var node = L.XmlUtil.createElementNS('gml:Point', {srsName: crs.code});
    node.appendChild(L.GmlUtil.posNode(L.Util.project(crs, this.getLatLng())));
    return node;
  }
});

L.Polygon.include({
  toGml: function (crs, forceMulti) {
    var polygons = this.getLatLngs();
    var gmlPolygons = [];

    for (var i = 0; i < polygons.length; i++) {
      var polygonCoordinates = polygons[i];
      var flat = L.Util.isFlat(polygonCoordinates);
      var node = L.XmlUtil.createElementNS('gml:Polygon', {srsName: crs.code, srsDimension: 2});
      node.appendChild(L.XmlUtil.createElementNS('gml:exterior'))
        .appendChild(L.XmlUtil.createElementNS('gml:LinearRing', {srsDimension: 2}))
        .appendChild(L.GmlUtil.posListNode(L.Util.project(crs, flat ? polygonCoordinates : polygonCoordinates[0]), true));

      if (!flat) {
        for (var hole = 1; hole < polygonCoordinates.length; hole++) {
          node.appendChild(L.XmlUtil.createElementNS('gml:interior'))
            .appendChild(L.XmlUtil.createElementNS('gml:LinearRing', {srsDimension: 2}))
            .appendChild(L.GmlUtil.posListNode(L.Util.project(crs, polygonCoordinates[hole]), true));
        }
      }

      gmlPolygons.push(node);
    }

    if (gmlPolygons.length === 1 && !forceMulti) return gmlPolygons[0];

    // else make multipolygon
    var multi = L.XmlUtil.createElementNS('gml:MultiSurface', {srsName: crs.code, srsDimension: 2});
    var collection = multi.appendChild(L.XmlUtil.createElementNS('gml:surfaceMembers'));
    for (var p = 0; p < gmlPolygons.length; p++) {
      collection.appendChild(gmlPolygons[p]);
    }

    return multi;
  }
});

L.Polyline.include({
  _lineStringNode: function (crs, latlngs) {
    var node = L.XmlUtil.createElementNS('gml:LineString', {srsName: crs.code, srsDimension: 2});
    node.appendChild(L.GmlUtil.posListNode(L.Util.project(crs, latlngs), false));
    return node;
  },

  toGml: function (crs, forceMulti) {
    var latLngs = this.getLatLngs();
    var gmlElements = [];

    if (L.Util.isFlat(latLngs)) {
       gmlElements.push(this._lineStringNode(crs, latLngs));
    } else {
      for (var i = 0; i < latLngs.length; i++) {
        gmlElements.push(this._lineStringNode(crs, latLngs[i]));
      }
    }

    if(gmlElements.length === 1 && !forceMulti) {
      return gmlElements[0];
    }

    var multi = L.XmlUtil.createElementNS('gml:MultiCurve', {srsName: crs.code, srsDimension: 2});
    var collection = multi.appendChild(L.XmlUtil.createElementNS('gml:curveMembers'));
    for (var lines = 0; lines < gmlElements.length; lines++) {
      collection.appendChild(gmlElements[lines]);
    }

    return multi;
  }
});

var PropertiesMixin = {
  setProperties: function (obj) {
    for (var i in obj) {
      if (obj.hasOwnProperty(i)) {
        this.feature.properties[i] = obj[i];
      }
    }
  },
  getProperty: function (field) {
    return this.feature.properties[field];
  },
  deleteProperties: function (arr) {
    for (var i = 0; i < arr.length; i++) {
      if (this.feature.properties.hasOwnProperty(arr[i])) {
        delete this.feature.properties[arr[i]];
      }
    }
  }
};
L.Marker.include(PropertiesMixin);
L.Path.include(PropertiesMixin);

L.WFS = L.FeatureGroup.extend({

  _capabilities: null,

  _boundingBox: null,

  options: {
    crs: L.CRS.EPSG3857,
    showExisting: true,
    geometryField: 'Shape',
    url: '',
    version: '1.1.0',
    typeNS: '',
    typeName: '',
    typeNSName: '',
    maxFeatures: null,
    filter: null,
    opacity: 1,
    fillOpacity: 1,
    style: {
      color: 'black',
      weight: 1,
      opacity: 1,
      fillOpacity: 1
    },
    namespaceUri: ''
  },

  state: {},

  initialize: function (options, readFormat) {
    L.setOptions(this, options);

    this.state = {
      exist: 'exist'
    };

    this._layers = {};

    this.readFormat = readFormat || new L.Format.GML({
      crs: this.options.crs,
      geometryField: this.options.geometryField
    });

    this.options.typeNSName = this.namespaceName(this.options.typeName);
    this.options.srsName = this.options.crs.code;

    this._updateOpacity();

    var that = this;
    this.describeFeatureType(function () {
      if (that.options.showExisting) {
        that.loadFeatures(that.options.filter);
      }
    }, function (errorMessage) {
      that.fire('error', {
        error: new Error(errorMessage)
      });
    });
  },

  namespaceName: function (name) {
    return this.options.typeNS + ':' + name;
  },

  describeFeatureType: function (successCallback, errorCallback) {
    var requestData = L.XmlUtil.createElementNS('wfs:DescribeFeatureType', {
      service: 'WFS',
      version: this.options.version
    });
    requestData.appendChild(L.XmlUtil.createElementNS('TypeName', {}, {
      value: this.options.typeNSName
    }));

    var that = this;
    L.Util.request({
      url: this.options.url,
      data: L.XmlUtil.serializeXmlDocumentString(requestData),
      headers: this.options.headers || {},
      success: function (data) {
        // If some exception occur, WFS-service can response successfully, but with ExceptionReport,
        // and such situation must be handled.
        var exceptionReport = L.XmlUtil.parseOwsExceptionReport(data);
        if (exceptionReport) {
          if (typeof (errorCallback) === 'function') {
            errorCallback(exceptionReport.message);
          }

          return;
        }

        var xmldoc = L.XmlUtil.parseXml(data);
        var featureInfo = xmldoc.documentElement;
        that.readFormat.setFeatureDescription(featureInfo);
        that.options.namespaceUri = featureInfo.attributes.targetNamespace.value;
        if (typeof (successCallback) === 'function') {
          successCallback();
        }
      },
      error: function (errorMessage) {
        if (typeof (errorCallback) === 'function') {
          errorCallback(errorMessage);
        }
      }
    });
  },

  getFeature: function (filter) {
    var request = L.XmlUtil.createElementNS('wfs:GetFeature', {
      service: 'WFS',
      version: this.options.version,
      maxFeatures: this.options.maxFeatures,
      outputFormat: this.readFormat.outputFormat
    });

    var query = request.appendChild(L.XmlUtil.createElementNS('wfs:Query', {
      typeName: this.options.typeNSName,
      srsName: this.options.srsName
    }));

    if (filter) {
      query.appendChild(L.filter(filter));
    }

    return request;
  },

  loadFeatures: function (filter) {
    var that = this;
    L.Util.request({
      url: this.options.url,
      data: L.XmlUtil.serializeXmlDocumentString(that.getFeature(filter)),
      headers: this.options.headers || {},
      success: function (responseText) {
        // If some exception occur, WFS-service can response successfully, but with ExceptionReport,
        // and such situation must be handled.
        var exceptionReport = L.XmlUtil.parseOwsExceptionReport(responseText);
        if (exceptionReport) {
          that.fire('error', {
            error: new Error(exceptionReport.message)
          });

          return that;
        }

        // Request was truly successful (without exception report),
        // so convert response to layers.
        var layers = that.readFormat.responseToLayers(responseText, {
          coordsToLatLng: that.options.coordsToLatLng,
          pointToLayer: that.options.pointToLayer
        });

        if (typeof that.options.style === "function") {
          layers.forEach(function (element) {
            element.state = that.state.exist;
            if (element.setStyle) {
              element.setStyle(that.options.style(element));
            }
            that.addLayer(element);
          });
        } else {
          layers.forEach(function (element) {
            element.state = that.state.exist;
            that.addLayer(element);
          });
          that.setStyle(that.options.style);
        }

        that.fire('load', {
          responseText: responseText
        });

        return that;
      },
      error: function (errorMessage) {
        that.fire('error', {
          error: new Error(errorMessage)
        });

        return that;
      }
    });
  },

  getCapabilities: function (successCallback, errorCallback) {
    var capabilities = this._capabilities;

    // Check if capabilities were already received & cached.
    if (capabilities) {
      if (typeof (successCallback) === 'function') {
        successCallback(capabilities);

        return;
      }
    }

    var requestData = L.XmlUtil.createElementNS('wfs:GetCapabilities', {
      service: 'WFS',
      version: this.options.version
    });

    var that = this;
    L.Util.request({
      url: this.options.url,
      data: L.XmlUtil.serializeXmlDocumentString(requestData),
      headers: this.options.headers || {},
      success: function (data) {
        // If some exception occur, WFS-service can response successfully, but with ExceptionReport,
        // and such situation must be handled.
        var exceptionReport = L.XmlUtil.parseOwsExceptionReport(data);
        if (exceptionReport) {
          if (typeof (errorCallback) === 'function') {
            errorCallback(new Error(exceptionReport.message));
          }

          return;
        }

        try {
          // Request was truly successful (without exception report), parse WFS_Capabilities.
          capabilities = L.XmlUtil.parseXml(data).documentElement;
        } catch (error) {
          // If parsing failed.
          if (typeof (errorCallback) === 'function') {
            errorCallback(error);
          }

          return;
        }

        // Cache received capabilities.
        that._capabilities = capabilities;

        if (typeof (successCallback) === 'function') {
          successCallback(capabilities);
        }
      },
      error: function (errorMessage) {
        if (typeof (errorCallback) === 'function') {
          errorCallback(new Error(errorMessage));
        }
      }
    });
  },

  getBoundingBox: function (successCallback, errorCallback) {
    var boundingBox = this._boundingBox;

    // Check if bounding box was already received & cached.
    if (boundingBox) {
      if (typeof (successCallback) === 'function') {
        successCallback(boundingBox);

        return;
      }
    }

    var that = this;
    this.getCapabilities(function (capabilities) {
      var featureTypeListElement = capabilities.getElementsByTagName('FeatureTypeList')[0];

      // Extract all 'FeatureType' nodes to list.
      var featureTypeList = featureTypeListElement.getElementsByTagName('FeatureType');

      for (var i = 0, len = featureTypeList.length; i < len; i++) {
        var featureType = featureTypeList[i];

        // Extract current FeatureType's name.
        var featureTypeNSName = L.XmlUtil.getNodeText(featureType.getElementsByTagName('Name')[0]);

        // Find node with current layer instance's name and namespace.
        if (featureTypeNSName === that.options.typeNSName) {
          // The <WGS84BoundingBox> element is used to indicate the edges of an
          // enclosing rectangle in decimal degrees of latitude and longitude in WGS84.
          var wgs84BoundingBox = featureType.getElementsByTagNameNS(L.XmlUtil.namespaces.ows, 'WGS84BoundingBox')[0];
          var lowerCornerElement = wgs84BoundingBox.getElementsByTagNameNS(L.XmlUtil.namespaces.ows, 'LowerCorner')[0];
          var upperCornerElement = wgs84BoundingBox.getElementsByTagNameNS(L.XmlUtil.namespaces.ows, 'UpperCorner')[0];

          // Corner node's inner text format is like '-74.047185 40.679648', Lng and Lat with a space between.
          var lowerCorner = L.XmlUtil.getNodeText(lowerCornerElement);
          var upperCorner = L.XmlUtil.getNodeText(upperCornerElement);

          // Extract LngLats and reverse it to LatLngs.
          var sw = lowerCorner.split(' ').reverse();
          var ne = upperCorner.split(' ').reverse();

          // Wrap it into LatLngBounds.
          boundingBox = L.latLngBounds([sw, ne]);

          break;
        }
      }

      // Cache received and calculated bounding box.
      that._boundingBox = boundingBox;

      if (typeof (successCallback) === 'function') {
        successCallback(boundingBox);
      }
    }, function (errorMessage) {
      if (typeof (errorCallback) === 'function') {
        errorCallback(new Error(errorMessage));
      }
    });
  },

  setOpacity: function (opacity, fillOpacity) {
    this.options.opacity = opacity;
    this.options.fillOpacity = fillOpacity || opacity;

    this._updateOpacity();

    return this;
  },

  _updateOpacity: function () {
    var style = L.extend(this.options.style || {}, {
      opacity: this.options.opacity,
      fillOpacity: this.options.fillOpacity
    });

    this.setStyle(style);
  }
});

L.wfs = function (options, readFormat) {
  return new L.WFS(options, readFormat);
};

L.WFST = L.WFS.extend({
  options: {
    forceMulti: false
  },

  initialize: function (options, readFormat) {
    L.WFS.prototype.initialize.call(this, options, readFormat);
    this.state = L.extend(this.state, {
      insert: 'insertElement',
      update: 'updateElement',
      remove: 'removeElement'
    });

    this.changes = {};
  },

  addLayer: function (layer) {
    L.FeatureGroup.prototype.addLayer.call(this, layer);
    if (!layer.feature) {
      layer.feature = { properties: {} };
    }

    if (!layer.state) {
      layer.state = this.state.insert;
      var id = this.getLayerId(layer);
      this.changes[id] = layer;
    }
    return this;
  },

  removeLayer: function (layer) {
    L.FeatureGroup.prototype.removeLayer.call(this, layer);

    var id = this.getLayerId(layer);

    if (id in this.changes) {
      var change = this.changes[id];
      if (change.state === this.state.insert) {
        delete this.changes[id];
      }
      else {
        change.state = this.state.remove;
      }
    }
    else {
      layer.state = this.state.remove;
      this.changes[id] = layer;
    }
  },

  editLayer: function (layer) {
    if (layer.state !== this.state.insert) {
      layer.state = this.state.update;
    }

    var id = this.getLayerId(layer);
    this.changes[id] = layer;
    return this;
  },

  save: function () {
    var transaction = L.XmlUtil.createElementNS('wfs:Transaction', { service: 'WFS', version: this.options.version });

    var inserted = [];

    for (var id in this.changes) {
      var layer = this.changes[id];
      var action = this[layer.state](layer);
      transaction.appendChild(action);

      if (layer.state === this.state.insert) {
        inserted.push(layer);
      }
    }

    var that = this;

    L.Util.request({
      url: this.options.url,
      data: L.XmlUtil.serializeXmlDocumentString(transaction),
      headers: this.options.headers || {},
      withCredentials: true,
      success: function (data) {
        var xmlDoc = L.XmlUtil.parseXml(data);
        var exception = L.XmlUtil.parseOwsExceptionReport(xmlDoc);
        if(exception !== null) {
          that.fire('save:failed', exception);
          return;
        }

        var insertResult = L.XmlUtil.evaluate('//wfs:InsertResults/wfs:Feature/ogc:FeatureId/@fid', xmlDoc);
        var insertedIds = [];
        var id = insertResult.iterateNext();
        while (id) {
          insertedIds.push(new L.Filter.GmlObjectID(id.value));
          id = insertResult.iterateNext();
        }

        inserted.forEach(function (layer) {
          L.FeatureGroup.prototype.removeLayer.call(that, layer);
        });

        that.once('load', function () {
          that.fire('save:success');
          that.changes = {};
        });

        that.loadFeatures(insertedIds);
      },
      error: function (data) {
        that.fire('save:failed', data);
      }
    });

    return this;
  }
});

L.wfst = function (options, readFormat) {
  return new L.WFST(options, readFormat);
};

L.WFST.include({
  gmlFeature: function (layer) {
    var featureNode = L.XmlUtil.createElementNS(this.options.typeNSName, {}, { uri: this.options.namespaceUri });
    var feature = layer.feature;
    for (var propertyName in feature.properties) {
      featureNode.appendChild(this.gmlProperty(propertyName,
        feature.properties[propertyName]));
    }

    featureNode.appendChild(
      this.gmlProperty(
        this.options.geometryField,
        layer.toGml(
          this.options.crs,
          this.options.forceMulti
        )
      )
    );

    return featureNode;
  },

  /**
     Returns element with name as tag and value as innerText or child element
     ```xml
     <name>value<name>
     ```

     or if value is element

     ```xml
     <name><value /><name>
     ```

     @method gmlProperty
     @param {string} name Name of property
     @param {Object} value Value of property
     @return {Element} simple property element <name>value<name>
   */
  gmlProperty: function (name, value) {
    var propertyNode = L.XmlUtil.createElementNS(this.namespaceName(name));
    if (value instanceof Element) {
      propertyNode.appendChild(value);
    }
    else if (value === null || value === undefined || value === '') {
      L.XmlUtil.setAttributes(propertyNode, { 'xsi:nil': true });
    } else {
      propertyNode.appendChild(L.XmlUtil.createTextNode(value));
    }

    return propertyNode;
  },

  /**
    Returns wfs:Property element with passed property name and value:
    ```xml
    <wfs:Property>
      <wfs:Name>%name%</wfs:Name>
      <wfs:Value>%value%</wfs:Value>
    </wfs:Property>
    ```

    @method wfsProperty
    @param {string} name Property name
    @param {Object} value Property value, if passed Element object it will be added as child element of value
    @return {Element}
   */
  wfsProperty: function (name, value) {
    var propertyNode = L.XmlUtil.createElementNS('wfs:Property');
    propertyNode.appendChild(L.XmlUtil.createElementNS('wfs:Name', {}, { value: name }));
    var valueNode = L.XmlUtil.createElementNS('wfs:Value');
    if (value instanceof Element) {
      valueNode.appendChild(value);
    }
    else {
      valueNode.appendChild(L.XmlUtil.createTextNode(value));
    }

    propertyNode.appendChild(valueNode);

    return propertyNode;
  }
});

L.WFST.include({

  /**
    Returns wfs:Insert element for passed layer

    @method insertElement
    @param {Layer} layer
    @return {Element} wfs:Insert element with layer
   */
  insertElement: function (layer) {
    var node = L.XmlUtil.createElementNS('wfs:Insert');
    node.appendChild(this.gmlFeature(layer));
    return node;
  },

  /**
    Returns wfs:Update element for specified layer

    @method updateElement
    @param {Layer} layer
    @return {Element} wfs:Update element for passed layer properties limited with filter by feature.id
   */
  updateElement: function (layer) {
    var node = L.XmlUtil.createElementNS('wfs:Update', { typeName: this.options.typeNSName });
    var feature = layer.feature;
    for (var propertyName in feature.properties) {
      if (feature.properties.hasOwnProperty(propertyName)) {
        node.appendChild(this.wfsProperty(propertyName, feature.properties[propertyName]));
      }
    }

    node.appendChild(
      this.wfsProperty(
        this.namespaceName(this.options.geometryField),
        layer.toGml(this.options.crs, this.options.forceMulti)
      )
    );

    var idFilter = new L.Filter.GmlObjectID(layer.feature.id);
    node.appendChild(L.filter(idFilter));
    return node;
  },

  removeElement: function (layer) {
    var node = L.XmlUtil.createElementNS('wfs:Delete', { typeName: this.options.typeNSName });
    var idFilter = new L.Filter.GmlObjectID(layer.feature.id);
    node.appendChild(L.filter(idFilter));
    return node;
  }
});


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