<?php
/**
 * Theme Tools: Site Breadcrumbs.
 *
 * Quickly add breadcrumbs to the single view of a hierarchical post type or a hierarchical taxonomy.
 *
 * @package automattic/jetpack-classic-theme-helper
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit( 0 );
}

$host = new Automattic\Jetpack\Status\Host();
if ( ! function_exists( 'jetpack_breadcrumbs' ) && ! $host->is_wpcom_simple() ) {
	/**
	 * Echos a set of breadcrumbs.
	 *
	 * Themes can call this function where the breadcrumbs should be outputted.
	 */
	function jetpack_breadcrumbs() {
		$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( (string) $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( (string) $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( (string) $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( (string) $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-classic-theme-helper' ) . '</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.
	 *
	 * @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|WP_Error A list of links to the term parents|WP_Error.
	 */
	function jetpack_get_term_parents( $term, $taxonomy, $visited = array() ) {
		$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;
	}
}
