import {i18n} from './i18n';
import {html} from 'lit-element';
// import JSONLD from 'vpu-common/jsonld';
import VPULitElement from 'vpu-common/vpu-lit-element'
import utils from "./utils";
import commonUtils from "vpu-common/utils";
import {unsafeHTML} from 'lit-html/directives/unsafe-html.js';

/**
 * KnowledgeBaseWebPageElementView web component
 */
class VPUKnowledgeBaseWebPageElementView extends VPULitElement {
    constructor() {
        super();
        this.lang = 'de';
        this.value = '';
        this.html = '';
        this.entryPointUrl = utils.getAPiUrl();
    }

    /**
     * See: https://lit-element.polymer-project.org/guide/properties#initialize
     */
    static get properties() {
        return {
            lang: { type: String },
            value: { type: String },
            html: { type: String, attribute: false },
            entryPointUrl: { type: String, attribute: 'entry-point-url' },
        };
    }

    connectedCallback() {
        super.connectedCallback();
        i18n.changeLanguage(this.lang);
        const that = this;

        // JSONLD.initialize(this.entryPointUrl, function (jsonld) {
        //     const apiUrl = jsonld.getApiUrlForEntityName("KnowledgeBaseWebPageElement") + '/' +
        //         encodeURIComponent(commonUtils.base64EncodeUnicode(encodeURIComponent(that.value)));
        // });

        window.addEventListener("vpu-auth-init", () => that.loadWebPageElement());
    }

    /**
     * Loads the data from the web page element
     */
    loadWebPageElement() {
        if (window.VPUAuthToken === undefined || window.VPUAuthToken === "") {
            return;
        }

        // sadly there there is no entity url without "collectionOperations" in entity KnowledgeBaseWebPageElement!
        const apiUrl = this.entryPointUrl + "/web_page_elements/knowledge_base_web_page_elements/" +
            encodeURIComponent(commonUtils.base64EncodeUnicode(encodeURIComponent(this.value))) +
            "?lang=" + encodeURIComponent(this.lang);

        fetch(apiUrl, {
            headers: {
                'Content-Type': 'application/ld+json',
                'Authorization': 'Bearer ' + window.VPUAuthToken,
            },
        })
            .then(res => res.json())
            .then(webPageElement => {
                if (webPageElement !== undefined && webPageElement.text !== undefined) {
                    this.html = webPageElement.text;
                }
            })
            // catch e.g. 404 errors
            .catch();
    }

    updated(changedProperties) {
        changedProperties.forEach((oldValue, propName) => {
            if (propName === "lang") {
                i18n.changeLanguage(this.lang);
            }

            switch(propName) {
                case "lang":
                case "value":
                case "entry-point-url":
                    this.loadWebPageElement();
                    break;
            }
        });
    }

    render() {
        return html`
            <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.5/css/bulma.min.css">
            <style>
            </style>

            <div class="columns">
                <div class="column">
                    Hier kann man dann etwas aufklappen.
                </div>
            </div>
            <div class="columns">
                <div class="column">
                    ${unsafeHTML(this.html)}
                </div>
            </div>
        `;
    }
}

customElements.define('vpu-knowledge-base-web-page-element-view', VPUKnowledgeBaseWebPageElementView);