<?php

namespace Glovario\Frontend;

defined( 'ABSPATH' ) || exit;

/**
 * Site Variables in the output of the free SEO plugins Yoast SEO and Rank Math.
 *
 * Both build the document title, Open Graph and Twitter titles, schema names,
 * and breadcrumbs from the raw post title through their own templates, so a
 * title such as "Call us at [glvr key=…]" reached search engines and social
 * networks with the shortcode. Their descriptions come from the content.
 *
 * Titles and breadcrumbs follow the title integration setting, like the
 * page's own title; descriptions always resolve, like the content. Values are
 * given as plain text: the SEO plugins escape their own output.
 */
final class SeoCompatibility {
	private $titles;

	public function __construct( TitleShortcodes $titles ) {
		$this->titles = $titles;
	}

	public function register() {
		$titles = '1' === get_option( TitleShortcodes::OPTION, '0' );

		// Yoast SEO.
		foreach ( array( 'wpseo_metadesc', 'wpseo_opengraph_desc', 'wpseo_twitter_description' ) as $hook ) {
			add_filter( $hook, array( $this, 'text' ) );
		}
		// Rank Math.
		add_filter( 'rank_math/frontend/description', array( $this, 'text' ) );
		add_filter( 'rank_math/paper/auto_generated_description/apply_shortcode', array( $this, 'rank_math_apply_shortcode' ) );

		if ( ! $titles ) {
			return;
		}
		foreach ( array( 'wpseo_title', 'wpseo_opengraph_title', 'wpseo_twitter_title', 'rank_math/frontend/title' ) as $hook ) {
			add_filter( $hook, array( $this, 'text' ) );
		}
		add_filter( 'wpseo_schema_graph', array( $this, 'structure' ) );
		add_filter( 'rank_math/json_ld', array( $this, 'structure' ), 99 );
		add_filter( 'wpseo_breadcrumb_links', array( $this, 'structure' ) );
		add_filter( 'rank_math/frontend/breadcrumb/items', array( $this, 'structure' ) );
	}

	/**
	 * A title or description with its Site Variables resolved.
	 *
	 * @param mixed $text Text from the SEO plugin.
	 * @return mixed
	 */
	public function text( $text ) {
		return is_string( $text ) ? $this->titles->plain( $text, get_queried_object_id() ) : $text;
	}

	/**
	 * Every string in a schema graph or breadcrumb trail, resolved.
	 *
	 * @param mixed $data Array from the SEO plugin.
	 * @return mixed
	 */
	public function structure( $data ) {
		if ( is_string( $data ) ) {
			return $this->text( $data );
		}
		if ( is_array( $data ) ) {
			foreach ( $data as $key => $value ) {
				$data[ $key ] = $this->structure( $value );
			}
		}
		return $data;
	}

	/**
	 * Rank Math removes every shortcode from the content it uses for automatic
	 * descriptions, which left "Our phone is and …". Let it run shortcodes only
	 * when the page's only shortcodes are Site Variables, so no other plugin's
	 * shortcode runs because of Glovario.
	 *
	 * @param bool $apply Whether Rank Math runs shortcodes.
	 * @return bool
	 */
	public function rank_math_apply_shortcode( $apply ) {
		$post = get_post( get_queried_object_id() );
		if ( $apply || ! $post || ! is_singular() ) {
			return $apply;
		}
		$content = $post->post_content . ' ' . $post->post_excerpt;
		if ( false === strpos( $content, '[glvr' ) || ! preg_match_all( '/' . get_shortcode_regex() . '/', $content, $matches ) ) {
			return $apply;
		}
		return array() === array_diff( array_unique( $matches[2] ), array( 'glvr' ) );
	}
}