"use strict";
  
  const idlUtils = require("../generated/utils");
  const HTMLElement = require("../generated/HTMLElement");
  const HTMLElementImpl = require("./HTMLElement-impl").implementation;
  
  const { nodeRoot } = require("../helpers/node");
  const { assignSlotableForTree, findFlattenedSlotables } = require("../helpers/shadow-dom");
  
  class HTMLSlotElementImpl extends HTMLElementImpl {
    constructor(globalObject, args, privateData) {
      super(globalObject, args, privateData);
      this._assignedNodes = [];
    }
  
    // https://dom.spec.whatwg.org/#slot-name
    get name() {
      return this.getAttributeNS(null, "name") || "";
    }
  
    _attrModified(name, value, oldValue) {
      super._attrModified(name, value, oldValue);
  
      // https://dom.spec.whatwg.org/#slot-name
      if (name === "name") {
        if (value === oldValue) {
          return;
        }
  
        if (value === null && oldValue === "") {
          return;
        }
  
        if (value === "" && oldValue === null) {
          return;
        }
  
        assignSlotableForTree(nodeRoot(this));
      }
    }
  
    // https://html.spec.whatwg.org/#dom-slot-assignednodes
    assignedNodes(options) {
      if (!options || !options.flatten) {
        return this._assignedNodes.map(idlUtils.wrapperForImpl);
      }
  
      return findFlattenedSlotables(this).map(idlUtils.wrapperForImpl);
    }
  
    // https://html.spec.whatwg.org/#dom-slot-assignedelements
    assignedElements(options) {
      return this.assignedNodes(options).filter(HTMLElement.is);
    }
  }
  
  module.exports = {
    implementation: HTMLSlotElementImpl
  };