import HTMLElement from '../html-element/HTMLElement.js';
import DOMTokenList from '../../dom-token-list/DOMTokenList.js';
import HTMLLinkElementUtility from './HTMLLinkElementUtility.js';
/**
 * HTML Link Element.
 *
 * Reference:
 * https://developer.mozilla.org/en-US/docs/Web/API/HTMLLinkElement.
 */
export default class HTMLLinkElement extends HTMLElement {
    constructor() {
        super(...arguments);
        this.onerror = null;
        this.onload = null;
        this.sheet = null;
        this._evaluateCSS = true;
        this._relList = null;
    }
    /**
     * Returns rel list.
     *
     * @returns Rel list.
     */
    get relList() {
        if (!this._relList) {
            this._relList = new DOMTokenList(this, 'rel');
        }
        return this._relList;
    }
    /**
     * Returns as.
     *
     * @returns As.
     */
    get as() {
        return this.getAttribute('as') || '';
    }
    /**
     * Sets crossOrigin.
     *
     * @param crossOrigin CrossOrigin.
     */
    set as(as) {
        this.setAttribute('as', as);
    }
    /**
     * Returns crossOrigin.
     *
     * @returns CrossOrigin.
     */
    get crossOrigin() {
        return this.getAttribute('crossorigin') || '';
    }
    /**
     * Sets crossOrigin.
     *
     * @param crossOrigin CrossOrigin.
     */
    set crossOrigin(crossOrigin) {
        this.setAttribute('crossorigin', crossOrigin);
    }
    /**
     * Returns href.
     *
     * @returns Href.
     */
    get href() {
        return this.getAttribute('href') || '';
    }
    /**
     * Sets href.
     *
     * @param href Href.
     */
    set href(href) {
        this.setAttribute('href', href);
    }
    /**
     * Returns hreflang.
     *
     * @returns Hreflang.
     */
    get hreflang() {
        return this.getAttribute('hreflang') || '';
    }
    /**
     * Sets hreflang.
     *
     * @param hreflang Hreflang.
     */
    set hreflang(hreflang) {
        this.setAttribute('hreflang', hreflang);
    }
    /**
     * Returns media.
     *
     * @returns Media.
     */
    get media() {
        return this.getAttribute('media') || '';
    }
    /**
     * Sets media.
     *
     * @param media Media.
     */
    set media(media) {
        this.setAttribute('media', media);
    }
    /**
     * Returns referrerPolicy.
     *
     * @returns ReferrerPolicy.
     */
    get referrerPolicy() {
        return this.getAttribute('referrerPolicy') || '';
    }
    /**
     * Sets referrerPolicy.
     *
     * @param referrerPolicy ReferrerPolicy.
     */
    set referrerPolicy(referrerPolicy) {
        this.setAttribute('referrerPolicy', referrerPolicy);
    }
    /**
     * Returns rel.
     *
     * @returns Rel.
     */
    get rel() {
        return this.getAttribute('rel') || '';
    }
    /**
     * Sets rel.
     *
     * @param rel Rel.
     */
    set rel(rel) {
        this.setAttribute('rel', rel);
    }
    /**
     * Returns type.
     *
     * @returns Type.
     */
    get type() {
        return this.getAttribute('type') || '';
    }
    /**
     * Sets type.
     *
     * @param type Type.
     */
    set type(type) {
        this.setAttribute('type', type);
    }
    /**
     * @override
     */
    setAttributeNode(attribute) {
        const replacedAttribute = super.setAttributeNode(attribute);
        if (attribute.name === 'rel' && this._relList) {
            this._relList._updateIndices();
        }
        if (attribute.name === 'rel' || attribute.name === 'href') {
            HTMLLinkElementUtility.loadExternalStylesheet(this);
        }
        return replacedAttribute;
    }
    /**
     * @override
     */
    removeAttributeNode(attribute) {
        super.removeAttributeNode(attribute);
        if (attribute.name === 'rel' && this._relList) {
            this._relList._updateIndices();
        }
        return attribute;
    }
    /**
     * @override
     */
    _connectToNode(parentNode = null) {
        const isConnected = this.isConnected;
        const isParentConnected = parentNode ? parentNode.isConnected : false;
        super._connectToNode(parentNode);
        if (isParentConnected && isConnected !== isParentConnected && this._evaluateCSS) {
            HTMLLinkElementUtility.loadExternalStylesheet(this);
        }
    }
}
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