// SHYUXINPC SEO 优化脚本
add_action('wp_footer', 'shyuxinpc_seo_scripts');
function shyuxinpc_seo_scripts() {
    if (is_front_page() || is_home() || is_page(14)) {
        echo "<style>h2.elementor-slide-heading { text-align: center !important; } a[href*='?cat=12'] { display: block; text-align: center; padding: 10px; margin: 10px 0; background: #0073aa; color: #fff; text-decoration: none; border-radius: 5px; }</style>";
        echo "<script>document.addEventListener('DOMContentLoaded', function() { var h2s = document.querySelectorAll('h2.elementor-slide-heading'); h2s.forEach(function(h2) { h2.style.textAlign = 'center'; }); var links = document.querySelectorAll('a[href*=\"?cat=12\"]'); links.forEach(function(link) { link.style.display = 'block'; link.style.textAlign = 'center'; link.style.padding = '10px'; link.style.margin = '10px 0'; link.style.background = '#0073aa'; link.style.color = '#fff'; link.style.textDecoration = 'none'; link.style.borderRadius = '5px'; }); });</script>";
    }
}
// shyuxinpc_seo_fix
add_action('wp_footer', 'shyuxinpc_seo_fix_js');
function shyuxinpc_seo_fix_js() {
    echo '<script>function fA(){document.querySelectorAll("img").forEach(function(i){if(!i.alt||""===i.alt.trim()){i.alt="SHYUXINPC - AI Hardware and GPU Server Provider Singapore"}})}fA();setTimeout(function(){fA()},1000);setTimeout(function(){fA()},3000);var o=new MutationObserver(function(m){m.forEach(function(e){if(e.addedNodes)e.addedNodes.forEach(function(n){if("IMG"===n.tagName||(n.querySelectorAll&&n.querySelectorAll("img").length>0))fA()})})});o.observe(document.body,{childList:!0,subtree:!0,attributes:!0,attributeFilter:["src"]})</script>';
}
// === SHYUXINPC Schema Markup ===
add_action('wp_head', 'shyuxinpc_schema_markup', 20);
function shyuxinpc_schema_markup() {
    // LocalBusiness Schema on front page
    if (is_front_page() || is_home() || is_page(14)) {
        echo '<script type="application/ld+json">
{
    "@context": "https://schema.org",
    "@type": "LocalBusiness",
    "name": "SHYUXINPC",
    "description": "Singapore-based provider of high-performance GPU servers, AI workstations, and custom deep learning hardware.",
    "url": "https://shyuxinpc.com",
    "address": {
        "@type": "PostalAddress",
        "streetAddress": "1 Rochor Canal Road #02-27, Sim Lim Square",
        "addressLocality": "Singapore",
        "postalCode": "188504",
        "addressCountry": "SG"
    },
    "openingHours": "Mo-Sa 10:00-19:00",
    "priceRange": "$$-$$$$",
    "areaServed": "Singapore, Southeast Asia, APAC"
}
</script>' . PHP_EOL;
    }
    
    // Breadcrumb Schema on all pages
    $crumbs = array(
        array("name" => "Home", "url" => home_url("/"))
    );
    
    if (is_single() || is_page()) {
        $crumbs[] = array("name" => get_the_title(), "url" => get_permalink());
    } elseif (is_category() || is_product_category()) {
        $cat = get_queried_object();
        if ($cat) {
            $crumbs[] = array("name" => "Products", "url" => home_url("/shop/"));
            $crumbs[] = array("name" => $cat->name, "url" => get_term_link($cat));
        }
    }
    
    $items = array();
    $i = 1;
    foreach ($crumbs as $crumb) {
        $items[] = array(
            "@type" => "ListItem",
            "position" => $i,
            "name" => $crumb["name"],
            "item" => $crumb["url"]
        );
        $i++;
    }
    
    $breadcrumb_json = json_encode(array(
        "@context" => "https://schema.org",
        "@type" => "BreadcrumbList",
        "itemListElement" => $items
    ), JSON_UNESCAPED_SLASHES);
    
    echo '<script type="application/ld+json">' . $breadcrumb_json . '</script>' . PHP_EOL;
}
// === END Schema Markup ======
// === Product Schema for WooCommerce (Safe Version) ===
add_action('wp_head', 'shyuxinpc_product_schema');
function shyuxinpc_product_schema() {
    // 只在 WooCommerce 产品页面执行
    if (!function_exists('is_product') || !is_product()) return;
    
    global $product;
    if (!isset($product) || !is_object($product)) return;
    
    try {
        $name = method_exists($product, 'get_name') ? $product->get_name() : get_the_title();
        $price = method_exists($product, 'get_price') ? $product->get_price() : '';
        $in_stock = method_exists($product, 'is_in_stock') ? $product->is_in_stock() : true;
        $desc = '';
        if (method_exists($product, 'get_short_description')) {
            $desc = wp_strip_all_tags($product->get_short_description());
        }
        if (empty($desc) && method_exists($product, 'get_description')) {
            $desc = wp_strip_all_tags($product->get_description());
        }
        
        $schema = array(
            "@context" => "https://schema.org",
            "@type" => "Product",
            "name" => $name,
            "description" => $desc
        );
        
        if (!empty($price)) {
            $schema["offers"] = array(
                "@type" => "Offer",
                "priceCurrency" => "USD",
                "price" => $price,
                "availability" => $in_stock ? "https://schema.org/InStock" : "https://schema.org/OutOfStock"
            );
        }
        
        echo '<script type="application/ld+json">' . json_encode($schema, JSON_UNESCAPED_SLASHES) . '</script>' . PHP_EOL;
    } catch (Exception $e) {
        // 静默失败，不影响页面渲染
    }
}
// === END Product Schema ===

// === Breadcrumbs (PHP Generated, No AIOSEO Dependency) ===
add_action('wp_footer', 'shyuxinpc_breadcrumbs_final', 20);
function shyuxinpc_breadcrumbs_final() {
    if (is_front_page() || is_home()) return;
    
    global $post;
    $crumbs = array();
    $crumbs[] = array('name' => 'Home', 'url' => home_url('/'));
    
    if (is_singular('product') && function_exists('wc_get_product')) {
        $product = wc_get_product(get_the_ID());
        if ($product) {
            $terms = get_the_terms(get_the_ID(), 'product_cat');
            if ($terms && !is_wp_error($terms)) {
                $term = reset($terms);
                $crumbs[] = array('name' => 'Products', 'url' => get_permalink(wc_get_page_id('shop')));
                $crumbs[] = array('name' => $term->name, 'url' => get_term_link($term));
            }
            $crumbs[] = array('name' => get_the_title(), 'url' => '');
        }
    } elseif (is_product_category()) {
        $cat = get_queried_object();
        $crumbs[] = array('name' => 'Products', 'url' => get_permalink(wc_get_page_id('shop')));
        $crumbs[] = array('name' => $cat->name, 'url' => '');
    } elseif (is_page()) {
        $crumbs[] = array('name' => get_the_title(), 'url' => '');
    } elseif (is_single()) {
        $categories = get_the_category();
        if ($categories && !is_wp_error($categories)) {
            $cat = reset($categories);
            $crumbs[] = array('name' => $cat->name, 'url' => get_category_link($cat));
        }
        $crumbs[] = array('name' => get_the_title(), 'url' => '');
    }
    
    if (count($crumbs) < 2) return;
    
    // 构建面包屑 HTML
    $html = '<div class="shyuxinpc-breadcrumbs" style="background:#f5f5f5;padding:10px 20px;font-size:14px;border-bottom:1px solid #ddd;">';
    $html .= '<span>You are here:</span> ';
    foreach ($crumbs as $i => $crumb) {
        if ($i > 0) $html .= ' &raquo; ';
        if (!empty($crumb['url'])) {
            $html .= '<a href="' . esc_url($crumb['url']) . '">' . esc_html($crumb['name']) . '</a>';
        } else {
            $html .= '<span>' . esc_html($crumb['name']) . '</span>';
        }
    }
    $html .= '</div>';
    
    // 用 JS 插入到页面顶部
    echo '<script>
    (function(){
        var bc = ' . wp_json_encode($html) . ';
        var wrapper = document.createElement("div");
        wrapper.innerHTML = bc;
        var bcEl = wrapper.firstChild;
        document.body.insertBefore(bcEl, document.body.firstChild);
    })();
    </script>';
}
// === END Breadcrumbs Final =======
// === Footer Navigation Links for SEO ===
add_action('wp_footer', 'shyuxinpc_footer_nav', 5);
function shyuxinpc_footer_nav() {
    if (is_front_page() || is_home()) return;
    echo '<div style="display:none;" aria-hidden="true">' . PHP_EOL;
    echo '<a href="' . home_url('/') . '">Home</a>' . PHP_EOL;
    echo '<a href="' . get_permalink(144) . '">Solutions</a>' . PHP_EOL;
    echo '<a href="' . get_permalink(151) . '">About Us</a>' . PHP_EOL;
    echo '<a href="' . home_url('/shop/') . '">Products</a>' . PHP_EOL;
    $termLink = get_term_link(12, 'product_cat'); if (!is_wp_error($termLink)) { echo '<a href="' . $termLink . '">GPU Servers</a>' . PHP_EOL; }
    echo '</div>' . PHP_EOL;
}
// === END Footer Nav ===




// test save

// test save