<?php
/**
 * Linked Container clicks.
 *
 * Prints assets/js/container-link.js on pages that render a linked Container, so
 * a click on its nested content follows the Container's link. Pages without one
 * load nothing.
 *
 * @package ABlocks
 */

namespace ABlocks\Frontend;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

class ContainerLink {

	const HANDLE = 'ablocks-container-link';

	public static function init() {
		$self = new self();
		add_filter( 'render_block_ablocks/container', [ $self, 'maybe_enqueue_script' ] );
	}

	/**
	 * @param string $block_content Rendered block HTML.
	 * @return string Unchanged.
	 */
	public function maybe_enqueue_script( $block_content ) {
		if (
			is_admin() ||
			wp_script_is( self::HANDLE, 'enqueued' ) ||
			! is_string( $block_content ) ||
			false === strpos( $block_content, 'class="ablocks-block-container__link-overlay"' )
		) {
			return $block_content;
		}

		$path = ABLOCKS_ASSETS_PATH . 'js/container-link.js';
		if ( ! file_exists( $path ) ) {
			return $block_content;
		}

		// Small enough to print inline rather than cost an extra HTTP request. The
		// readable source file stays the single source of truth.
		wp_register_script( self::HANDLE, false, [], ABLOCKS_VERSION, [ 'in_footer' => true ] );
		wp_enqueue_script( self::HANDLE );
		// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
		wp_add_inline_script( self::HANDLE, (string) file_get_contents( $path ) );

		return $block_content;
	}
}