// *************************************************************
// Function Name: get_custom_product_data
// Summary: Pass SCF values to RankMath Scheme
// *************************************************************
add_filter('rank_math/snippet/rich_snippet_product_entity', function($entity) {
    if (!is_singular('inventory')) {
        return $entity;
    }

    $product_id = get_queried_object_id();
    if (!$product_id) {
        return $entity;
    }

    $product_info = get_custom_product_data($product_id);

    if (!isset($entity['offers'])) {
        $entity['offers'] = [];
    }

    if ($product_info['price'] !== null) {
        $entity['offers']['price'] = number_format($product_info['price'], 2);
        $entity['offers']['priceCurrency'] = 'JPY';
    }

    $entity['offers']['availability'] = 'https://schema.org/' . $product_info['availability'];

    return $entity;
}, 10, 1);

function get_custom_product_data($product_id) {
    if (!$product_id) {
        return [
            'price' => null,
            'availability' => 'OutOfStock'
        ];
    }

    // Get inventory status
    $inventory_situation = SCF::get('inventory_situation', $product_id);
    if (!$inventory_situation) {
        $inventory_situation = 'sold'; // Set default value
    }

    // Get price
    $inventory_price = SCF::get('inventory_price', $product_id);

    // Set price based on inventory status
    if ($inventory_situation === 'normal') {
        $price = $inventory_price ? floatval($inventory_price) : null;
    } else {
        $price = null;
    }

    return [
        'price' => $price,
        'availability' => $inventory_situation === 'normal' ? 'InStock' : 'OutOfStock'
    ];
}