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/**
 * WordPress dependencies
 */
import apiFetch from '@wordpress/api-fetch';

/**
 * Load an asset for a block.
 *
 * This function returns a Promise that will resolve once the asset is loaded,
 * or in the case of Stylesheets and Inline JavaScript, will resolve immediately.
 *
 * @param {HTMLElement} el A HTML Element asset to inject.
 *
 * @return {Promise} Promise which will resolve when the asset is loaded.
 */
export const LoadAsset = (el) => {
    return new Promise((resolve, reject) => {
        /*
         * Reconstruct the passed element, this is required as inserting the Node directly
         * won't always fire the required onload events, even if the asset wasn't already loaded.
         */
        const newNode = document.createElement(el.nodeName);

        ['id', 'rel', 'src', 'href', 'type'].forEach((attr) => {
            if (el[attr]) {
                newNode[attr] = el[attr];
            }
        });

        // Append inline <script> contents.
        if (el.innerHTML) {
            newNode.appendChild(document.createTextNode(el.innerHTML));
        }

        newNode.onload = () => resolve(true);
        newNode.onerror = () => reject(new Error('Error loading asset.'));

        document.body.appendChild(newNode);

        // Resolve Stylesheets and Inline JavaScript immediately.
        if (
            'link' === newNode.nodeName.toLowerCase() ||
            ('script' === newNode.nodeName.toLowerCase() && !newNode.src)
        ) {
            resolve();
        }
    });
};

/**
 * Load the asset files for a block
 */
export async function LoadAssets() {
    /*
     * Fetch the current URL (post-new.php, or post.php?post=1&action=edit) and compare the
     * JavaScript and CSS assets loaded between the pages. This imports the required assets
     * for the block into the current page while not requiring that we know them up-front.
     * In the future this can be improved by reliance upon block.json and/or a script-loader
     * dependency API.
     */
    const response = await apiFetch({
        url: document.location.href,
        parse: false,
    });

    const data = await response.text();

    const doc = new window.DOMParser().parseFromString(data, 'text/html');
    const oldAssets = [
        // load block categories
        'wp-blocks-js-after',
        // woocommerce blocks
        'essential-blocks-blocks-localize-js-extra',
        'elementor-editor-js-before',
    ];

    const newAssets = Array.from(
        doc.querySelectorAll('link[rel="stylesheet"],script')
    ).filter((asset) => asset.id && (oldAssets.includes(asset.id) || !document.getElementById(asset.id)));

    /*
     * Load each asset in order, as they may depend upon an earlier loaded script.
     * Stylesheets and Inline Scripts will resolve immediately upon insertion.
     */
    for (const newAsset of newAssets) {
        await LoadAsset(newAsset);
    }
}