/*
Plugin Name: WooCommerce Variation Swatches Optimized Loader (v1.6 Ultra Fast Fix - Enhanced Error Handling)
Description: Ultra-light, true ultra-fast JSON-LD for variations (100+ supported). Single DB query for variation SKU+image, preserves full-size images, safe for high-load hosts.
Version: 1.6.1
Author: Custom (Enhanced by Gemini)
*/
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}
/**
 * 1) Front-end swatch: small image + full srcset (unchanged, safe)
 */
add_filter('woocommerce_swatches_image_html', function($html, $image_id){
    if ( ! $image_id ) return $html;
    // Use thumbnail for swatch display (fast) and full in srcset for crawlers
    $swatch_size = 'thumbnail';
    $src  = wp_get_attachment_image_url($image_id, $swatch_size);
    $srcset = wp_get_attachment_image_srcset($image_id, 'full');
    return sprintf(
        '<img src="%s" srcset="%s" sizes="(max-width:600px) 100px, 200px" loading="lazy" decoding="async" alt="" />',
        esc_url($src),
        esc_attr($srcset)
    );
}, 10, 2);
/**
 * 2) v1.6.1 Ultra-fast JSON-LD for variations - Enhanced Error Handling
 *
 * Key ideas:
 * - Added explicit $wpdb error checks after queries for robustness.
 * - Single optimized DB query to fetch variation ID -> sku + thumbnail_id
 */
add_filter('woocommerce_structured_data_product', function($data, $product){
    // Safety guards: skip background / REST / CLI / admin-lists
    if ( wp_doing_cron() || ( defined('WP_CLI') && WP_CLI ) || ( defined('REST_REQUEST') && REST_REQUEST ) ) {
        return $data;
    }
    if ( is_admin() && ! wp_doing_ajax() ) {
        return $data;
    }
    // only for variable products with variant JSON-LD present
    if ( ! $product || ! $product->is_type('variable') || empty($data['hasVariant']) || ! is_array($data['hasVariant']) ) {
        return $data;
    }
    static $processed = [];
    $product_id = intval( $product->get_id() );
    if ( isset( $processed[ $product_id ] ) ) {
        return $data;
    }
    $processed[ $product_id ] = true;
    // Build SKU -> index map from the existing structured data (cheap)
    $variant_index = [];
    foreach ( $data['hasVariant'] as $i => $v ) {
        if ( isset( $v['sku'] ) && $v['sku'] !== '' ) {
            $variant_index[ (string) $v['sku'] ] = $i;
        }
    }
    if ( empty( $variant_index ) ) {
        return $data;
    }
    global $wpdb;
    
    // --- 查詢 1: 獲取所有變體 ID ---
    // Fetch variation IDs (published) for this parent product
    $variation_ids = $wpdb->get_col( $wpdb->prepare(
        "SELECT ID FROM {$wpdb->posts} WHERE post_parent = %d AND post_type = 'product_variation' AND post_status IN ('publish','private','draft')",
        $product_id
    ) );

    // 錯誤檢查 1: 確保查詢成功且結果是陣列
    if ( ! is_array( $variation_ids ) || $wpdb->last_error ) {
        // Log the error if necessary, but safely return original data
        // error_log( "Variation Swatch JSON-LD DB Error 1: " . $wpdb->last_error );
        return $data;
    }
    
    if ( empty( $variation_ids ) ) {
        return $data;
    }
    
    // --- 查詢 2: 批次獲取 SKUs 和 Thumbnail IDs ---
    // Prepare to fetch meta for those variation IDs: _sku and _thumbnail_id
    $ids_placeholders = implode( ',', array_fill(0, count($variation_ids), '%d') );
    $meta_query = "
        SELECT post_id, meta_key, meta_value
        FROM {$wpdb->postmeta}
        WHERE post_id IN ($ids_placeholders)
          AND meta_key IN ('_sku','_thumbnail_id')
    ";
    // Build args for prepare: array( query_string, id1, id2, ... )
    $prepare_args = array_merge( array( $meta_query ), $variation_ids );
    $sql = array_shift($prepare_args);
    
    $rows = $wpdb->get_results( $wpdb->prepare( $sql, $prepare_args ), ARRAY_A );

    // 錯誤檢查 2: 確保查詢成功且結果是陣列
    if ( ! is_array( $rows ) || $wpdb->last_error ) {
        // Log the error if necessary, but safely return original data
        // error_log( "Variation Swatch JSON-LD DB Error 2: " . $wpdb->last_error );
        return $data;
    }
    
    if ( empty( $rows ) ) {
        return $data;
    }
    
    // Reduce rows into a map: variation_id => ['sku'=>..., 'image_id'=>...]
    $map = [];
    foreach ( $rows as $r ) {
        $vid = intval( $r['post_id'] );
        if ( ! isset( $map[ $vid ] ) ) $map[ $vid ] = [ 'sku' => '', 'image_id' => 0 ];
        if ( $r['meta_key'] === '_sku' ) {
            $map[ $vid ]['sku'] = (string) $r['meta_value'];
        } elseif ( $r['meta_key'] === '_thumbnail_id' ) {
            $map[ $vid ]['image_id'] = intval( $r['meta_value'] );
        }
    }
    
    // Parent product fallback full image
    $parent_image_id = $product->get_image_id();
    $parent_full_url = $parent_image_id ? wp_get_attachment_image_url( $parent_image_id, 'full' ) : '';
    
    // Iterate the map and fill JSON-LD
    foreach ( $map as $vid => $info ) {
        $sku = (string) $info['sku'];
        if ( $sku === '' ) {
            continue;
        }
        if ( ! isset( $variant_index[ $sku ] ) ) {
            // SKU not present in original structured data (skip)
            continue;
        }
        $idx = $variant_index[ $sku ];
        $image_id = intval( $info['image_id'] );
        $full_url = '';
        if ( $image_id > 0 ) {
            // minimal call to produce final URL; this is safe and cheap
            $full_url = wp_get_attachment_image_url( $image_id, 'full' );
        } else {
            $full_url = $parent_full_url;
        }
        if ( $full_url ) {
            // 確保結構：使用陣列形式以符合 JSON-LD 規範，並使用 esc_url_raw
            $data['hasVariant'][ $idx ]['image'] = array( esc_url_raw( $full_url ) );
        }
    }
    
    return $data;
}, 10, 2);<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="//cottonsweetshop.com/main-sitemap.xsl"?>
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		<lastmod>2025-11-19T09:26:39+00:00</lastmod>
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		<lastmod>2025-10-08T01:00:59+00:00</lastmod>
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</sitemapindex>
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