<?php
/**
 * Theme adjustments for pages that show the public booking form.
 *
 * @package Abientot
 */

namespace Abientot\Frontend;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Cocoon builds an automatic table of contents from every h2-h6 of the page content and inserts it before the
 * first h2. On a booking page that h2 is often the form's own title, so the table of contents lands inside the
 * form and lists the booking steps. On pages with the form, Cocoon's per-page "hide the table of contents" option
 * (post meta the_page_toc_novisible) reads as ticked; the form keeps its semantic headings.
 * Filter `abientot_hide_cocoon_toc` (bool, post ID) keeps Cocoon's table of contents on a given page.
 */
final class ThemeCompat {
	private const COCOON_TOC_META = 'the_page_toc_novisible';

	/**
	 * Posts whose content rendered a booking form in this request (forms from patterns or nested content).
	 *
	 * @var array<int,bool>
	 */
	private static array $rendered = array();

	/**
	 * Posts already checked for the shortcode or block.
	 *
	 * @var array<int,bool>
	 */
	private static array $checked = array();

	/** Hooks the theme adjustments; each one checks the active theme itself. */
	public function register(): void {
		add_filter( 'get_post_metadata', array( $this, 'cocoon_toc' ), 10, 3 );
	}

	/** Called by the form renderer while the post content is being displayed. */
	public static function form_rendered(): void {
		$id = get_the_ID();
		if ( $id ) {
			self::$rendered[ (int) $id ] = true;
		}
	}

	/**
	 * Answers Cocoon's per-page table-of-contents setting on booking pages.
	 *
	 * @param mixed  $value     Short-circuit value (null to read the database).
	 * @param int    $object_id Post ID.
	 * @param string $meta_key  Meta key.
	 * @return mixed
	 */
	public function cocoon_toc( $value, $object_id, $meta_key ) {
		if ( self::COCOON_TOC_META !== $meta_key || is_admin() || 'cocoon-master' !== get_template() ) {
			return $value;
		}
		$object_id = (int) $object_id;
		if ( $object_id <= 0 || ! self::has_form( $object_id ) || ! apply_filters( 'abientot_hide_cocoon_toc', true, $object_id ) ) {
			return $value;
		}
		return array( '1' );
	}

	/**
	 * Whether the post shows a booking form (shortcode, block, or a form rendered from its content).
	 *
	 * @param int $id Post ID.
	 */
	private static function has_form( int $id ): bool {
		if ( ! empty( self::$rendered[ $id ] ) ) {
			return true;
		}
		if ( ! isset( self::$checked[ $id ] ) ) {
			$post                 = get_post( $id );
			self::$checked[ $id ] = $post && ( has_shortcode( (string) $post->post_content, 'abientot_booking_form' ) || has_block( 'abientot/booking-form', $post ) );
		}
		return self::$checked[ $id ];
	}
}