"use strict";
  
  const { domSymbolTree } = require("../helpers/internal-constants");
  const { SVG_NS } = require("../helpers/namespaces");
  const { mixin } = require("../../utils");
  const SVGAnimatedString = require("../generated/SVGAnimatedString");
  const ElementImpl = require("./Element-impl").implementation;
  const ElementCSSInlineStyleImpl = require("./ElementCSSInlineStyle-impl").implementation;
  const GlobalEventHandlersImpl = require("./GlobalEventHandlers-impl").implementation;
  const HTMLOrSVGElementImpl = require("./HTMLOrSVGElement-impl").implementation;
  
  class SVGElementImpl extends ElementImpl {
    constructor(globalObject, args, privateData) {
      super(globalObject, args, privateData);
      this._initHTMLOrSVGElement();
      this._initElementCSSInlineStyle();
      this._initGlobalEvents();
    }
  
    // Keep in sync with HTMLElement. https://github.com/jsdom/jsdom/issues/2599
    _attrModified(name, value, oldValue) {
      if (name === "style" && value !== oldValue && !this._settingCssText) {
        this._settingCssText = true;
        this._style.cssText = value;
        this._settingCssText = false;
      } else if (name.startsWith("on")) {
        this._globalEventChanged(name.substring(2));
      }
  
      super._attrModified.apply(this, arguments);
    }
  
    get className() {
      return SVGAnimatedString.createImpl(this._globalObject, [], {
        element: this,
        attribute: "class"
      });
    }
  
    get ownerSVGElement() {
      let e = domSymbolTree.parent(this);
      while (e && e.namespaceURI === SVG_NS) {
        if (e.localName === "svg") {
          return e;
        }
        e = domSymbolTree.parent(e);
      }
  
      return null;
    }
  
    get viewportElement() {
      // TODO: <symbol>/<use> may make this different from ownerSVGElement.
      return this.ownerSVGElement;
    }
  }
  
  SVGElementImpl.attributeRegistry = new Map();
  
  mixin(SVGElementImpl.prototype, ElementCSSInlineStyleImpl.prototype);
  mixin(SVGElementImpl.prototype, GlobalEventHandlersImpl.prototype);
  mixin(SVGElementImpl.prototype, HTMLOrSVGElementImpl.prototype);
  
  exports.implementation = SVGElementImpl;