<?php
/**
 * Plugin Name: Site Breadcrumbs
 * Plugin URI: https://wordpress.com
 * Description: Quickly add breadcrumbs to the single view of a hierarchical post type or a hierarchical taxonomy.
 * Author: Automattic
 * Version: 1.0
 * Author URI: https://wordpress.com
 * License: GPL2 or later
 * Text Domain: jetpack
 *
 * @package automattic/jetpack
 */

if ( ! class_exists( '\Automattic\Jetpack\Classic_Theme_Helper\Main' ) ) {

	if ( ! function_exists( 'jetpack_breadcrumbs' ) ) {
		/**
		 * Echos a set of breadcrumbs.
		 *
		 * Themes can call this function where the breadcrumbs should be outputted.
		 *
		 * @phan-suppress PhanRedefineFunction -- Covered by function_exists check.
		 */
		function jetpack_breadcrumbs() {
			_deprecated_function( __FUNCTION__, 'jetpack-13.8' );
			$taxonomy                 = is_category() ? 'category' : get_query_var( 'taxonomy' );
			$is_taxonomy_hierarchical = is_taxonomy_hierarchical( $taxonomy );

			$post_type                 = is_page() ? 'page' : get_query_var( 'post_type' );
			$is_post_type_hierarchical = is_post_type_hierarchical( $post_type );

			if ( ! ( $is_post_type_hierarchical || $is_taxonomy_hierarchical ) || is_front_page() ) {
				return;
			}

			$breadcrumb = '';
			$position   = 1;

			if ( $is_post_type_hierarchical ) {
				$post_id   = get_queried_object_id();
				$ancestors = array_reverse( get_post_ancestors( $post_id ) );
				if ( $ancestors ) {
					foreach ( $ancestors as $ancestor ) {
						$breadcrumb .= '<span itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><meta itemprop="position" content="' . esc_attr( $position ) . '"><a href="' . esc_url( get_permalink( $ancestor ) ) . '" itemprop="item"><span itemprop="name">' . esc_html( get_the_title( $ancestor ) ) . '</span></a></span>';
						++$position;
					}
				}
				$breadcrumb .= '<span class="current-page" itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><meta itemprop="position" content="' . esc_attr( $position ) . '"><span itemprop="name">' . esc_html( get_the_title( $post_id ) ) . '</span></span>';
			} elseif ( $is_taxonomy_hierarchical ) {
				$current = get_term( get_queried_object_id(), $taxonomy );

				if ( is_wp_error( $current ) ) {
					return;
				}

				if ( $current->parent ) {
					$breadcrumb = jetpack_get_term_parents( $current->parent, $taxonomy );
				}

				$breadcrumb .= '<span class="current-category" itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><meta property="position" content="' . esc_attr( $position ) . '"><span itemprop="name">' . esc_html( $current->name ) . '</span></span>';
			}

			$home = '<span itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><meta itemprop="position" content="' . esc_attr( $position ) . '"><meta itemprop="position" content="0"><a href="' . esc_url( home_url( '/' ) ) . '" class="home-link" itemprop="item" rel="home"><span itemprop="name">' . esc_html__( 'Home', 'jetpack' ) . '</span></a></span>';

			echo '<nav class="entry-breadcrumbs" itemscope itemtype="https://schema.org/BreadcrumbList">' . $home . $breadcrumb . '</nav>'; //phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
		}

	}

	if ( ! function_exists( 'jetpack_get_term_parents' ) ) {
		/**
		 * Return the parents for a given taxonomy term ID.
		 *
		 * @phan-suppress PhanRedefineFunction -- Covered by function_exists check.
		 *
		 * @param int    $term Taxonomy term whose parents will be returned.
		 * @param string $taxonomy Taxonomy name that the term belongs to.
		 * @param array  $visited Terms already added to prevent duplicates.
		 *
		 * @return string A list of links to the term parents.
		 */
		function jetpack_get_term_parents( $term, $taxonomy, $visited = array() ) {
			_deprecated_function( __FUNCTION__, 'jetpack-13.8' );
			$parent = get_term( $term, $taxonomy );

			if ( is_wp_error( $parent ) ) {
				return $parent;
			}

			$chain = '';

			if ( $parent->parent && ( $parent->parent !== $parent->term_id ) && ! in_array( $parent->parent, $visited, true ) ) {
				$visited[] = $parent->parent;
				$chain    .= jetpack_get_term_parents( $parent->parent, $taxonomy, $visited );
			}

			$chain .= '<a href="' . esc_url( get_category_link( $parent->term_id ) ) . '">' . $parent->name . '</a>';

			return $chain;
		}
	}
}