<?php
/**
 * crumbs.php — breadcrumbs + BreadcrumbList JSON-LD (schema printed in Stage 2 seo path).
 */
defined('ABSPATH') || exit;

function zpj_breadcrumbs() {
    if (is_front_page()) return;
    $items = [['ホーム', home_url('/')]];

    if (is_singular('post')) {
        $cat = zpj_primary_cat();
        if ($cat) $items[] = [$cat->name, get_term_link($cat)];
        $items[] = [get_the_title(), ''];
    } elseif (is_category()) {
        $items[] = [single_cat_title('', false), ''];
    } elseif (is_page()) {
        $items[] = [get_the_title(), ''];
    } elseif (is_search()) {
        $items[] = ['検索結果', ''];
    } elseif (is_404()) {
        $items[] = ['ページが見つかりません', ''];
    } elseif (is_home()) {
        $items[] = ['記事一覧', ''];
    }

    echo '<nav class="zpj-crumbs" aria-label="パンくずリスト"><ol>';
    $last = count($items) - 1;
    foreach ($items as $i => $it) {
        list($label, $url) = $it;
        if ($i < $last && $url) {
            printf('<li><a href="%s">%s</a></li>', esc_url($url), esc_html($label));
        } else {
            printf('<li aria-current="page">%s</li>', esc_html($label));
        }
    }
    echo '</ol></nav>';
}