<?php
/**
 * Include breadcrumb trails.
 *
 * Must be included in functions.php
 * 
 * @package GenerateChild
 */

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

/**
 * Add breadcrumb after header
 */
add_action( 'generate_before_content', 'gpc_add_breadcrumb' );
function gpc_add_breadcrumb() {
    gpc_breadcrumbs();
}

/**
 * Breadcrumbs function
 * @link https://www.techpulsetoday.com/wordpress-breadcrumbs-without-plugin/
 */
 function gpc_breadcrumbs() {
    
    $showOnHome = 0; // 1 - show breadcrumbs on the homepage, 0 - don't show
    $delimiter = '<span class="delimiter">&rtrif;</span>'; // delimiter between crumbs
    $home = 'Home'; // text for the 'Home' link
    $showCurrent = 1; // 1 - show current post/page title in breadcrumbs, 0 - don't show
    $before = '<span class="current">'; // tag before the current crumb
    $after = '</span>'; // tag after the current crumb
    
    global $post;
    $homeLink = get_bloginfo( 'url' );
    
    if ( is_home() || is_front_page() ) {
        
        if ( $showOnHome == 1 ) echo '<div id="crumbs" class="breadcrumbs"><a href="' . $homeLink . '">' . $home . '</a></div>';
        
    } else {
        
        echo '<div id="crumbs" class="breadcrumbs"><a href="' . $homeLink . '">' . $home . '</a> ' . $delimiter . ' ';
        
        if ( is_category() ) {
            $thisCat = get_category(get_query_var('cat'), false);
            if ($thisCat->parent != 0) echo get_category_parents($thisCat->parent, TRUE, ' ' . $delimiter . ' ');
            echo $before . 'Archive by category "' . single_cat_title('', false) . '"' . $after;
            
        } elseif ( is_search() ) {
            echo $before . 'Search results for "' . get_search_query() . '"' . $after;
            
        } elseif ( is_day() ) {
            echo '<a href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a> ' . $delimiter . ' ';
            echo '<a href="' . get_month_link(get_the_time('Y'),get_the_time('m')) . '">' . get_the_time('F') . '</a> ' . $delimiter . ' ';
            echo $before . get_the_time('d') . $after;
            
        } elseif ( is_month() ) {
            echo '<a href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a> ' . $delimiter . ' ';
            echo $before . get_the_time('F') . $after;
            
        } elseif ( is_year() ) {
            echo $before . get_the_time('Y') . $after;
            
        } elseif ( is_single() && !is_attachment() ) {
            if ( get_post_type() != 'post' ) {
                $post_type = get_post_type_object(get_post_type());
                $slug = $post_type->rewrite;
                echo '<a href="' . $homeLink . '/' . $slug['slug'] . '/">' . $post_type->labels->singular_name . '</a>';
                if ($showCurrent == 1) echo ' ' . $delimiter . ' ' . $before . get_the_title() . $after;
            } else {
                $cat = get_the_category(); $cat = $cat[0];
                $cats = get_category_parents($cat, TRUE, ' ' . $delimiter . ' ');
                if ($showCurrent == 0) $cats = preg_replace("#^(.+)\s$delimiter\s$#", "$1", $cats);
                echo $cats;
                if ($showCurrent == 1) echo $before . get_the_title() . $after;
            }
            
        } elseif ( !is_single() && !is_page() && get_post_type() != 'post' && !is_404() ) {
            $post_type = get_post_type_object(get_post_type());
            echo $before . $post_type->labels->singular_name . $after;
            
        } elseif ( is_attachment() ) {
            $parent = get_post($post->post_parent);
            $cat = get_the_category($parent->ID); $cat = $cat[0];
            if ( ! is_wp_error( get_category_parents($cat, TRUE, ' ' . $delimiter . ' ') ) ) {
                echo get_category_parents($cat, TRUE, ' ' . $delimiter . ' ');
            }
            if ( ! is_wp_error( get_permalink($parent) ) ) {
                echo '<a href="' . get_permalink($parent) . '">' . $parent->post_title . '</a>';
            }
            if ($showCurrent == 1) echo ' ' . $delimiter . ' ' . $before . get_the_title() . $after;
            
        } elseif ( is_page() && !$post->post_parent ) {
            if ($showCurrent == 1) echo $before . get_the_title() . $after;
            
        } elseif ( is_page() && $post->post_parent ) {
            $parent_id  = $post->post_parent;
            $breadcrumbs = array();
            while ($parent_id) {
                $page = get_page($parent_id);
                $breadcrumbs[] = '<a href="' . get_permalink($page->ID) . '">' . get_the_title($page->ID) . '</a>';
                $parent_id  = $page->post_parent;
            }
            $breadcrumbs = array_reverse($breadcrumbs);
            for ($i = 0; $i < count($breadcrumbs); $i++) {
                echo $breadcrumbs[$i];
                if ($i != count($breadcrumbs)-1) echo ' ' . $delimiter . ' ';
            }
            if ($showCurrent == 1) echo ' ' . $delimiter . ' ' . $before . get_the_title() . $after;
            
        } elseif ( is_tag() ) {
            echo $before . 'Posts tagged "' . single_tag_title('', false) . '"' . $after;
            
        } elseif ( is_author() ) {
            global $author;
            $userdata = get_userdata($author);
            echo $before . 'Articles posted by ' . $userdata->display_name . $after;
            
        } elseif ( is_404() ) {
            echo $before . 'Error 404' . $after;
        }
        
        if ( get_query_var('paged') ) {
            if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ' (';
            echo __('Page') . ' ' . get_query_var('paged');
            if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ')';
        }
        
        echo '</div>';
        
    }
}