woocommerce/plugins/woocommerce-admin/client/customize-store/assembler-hub/hooks/use-selected-pattern.ts

/**
 * External dependencies
 */
import { useEffect, useState } from '@wordpress/element';

/**
 * Internal dependencies
 */
import { PatternWithBlocks } from '~/customize-store/types/pattern';

export const useSelectedPattern = (
	patternSelector = '.edit-site-sidebar-navigation-screen__content .block-editor-block-patterns-list__item'
) => {
	const [ selectedPattern, setSelectedPattern ] =
		useState< PatternWithBlocks >();

	useEffect( () => {
		// This is a hack to add the "is-selected" class to the selected pattern
		const patternElements = document.querySelectorAll( patternSelector );

		patternElements.forEach( ( patternElement ) => {
			if (
				patternElement.getAttribute( 'aria-label' ) ===
				selectedPattern?.title
			) {
				patternElement.classList.add( 'is-selected' );
			} else {
				patternElement.classList.remove( 'is-selected' );
			}
		} );
	}, [ selectedPattern, patternSelector ] );

	return {
		selectedPattern,
		setSelectedPattern,
	};
};