Auto SKU to products sanitize check dupes by initial of POST word if composite word or 1st 3 letters fom single word POST

add_action('init', function () {

    if (!is_admin()) return;

    // STOP if SKUs were already generated

    if (get_option('auto_sku_generated') === 'yes') return;

    // ✅ Immediately mark it done to prevent infinite loops

    update_option('auto_sku_generated', 'yes');

    // Fetch all published WooCommerce products

    $args = array(

        'post_type'      => 'product',

        'posts_per_page' => -1,

        'post_status'    => 'publish',

    );

    $products = get_posts($args);

    foreach ($products as $product_post) {

        $product = wc_get_product($product_post->ID);

        if (!$product) continue;

        $name = $product->get_name();

        $words = preg_split('/\s+/', trim($name));

        $initials = '';

        $total_words = count($words);

        // Initials rules

        if ($total_words === 1) {

            $initials = strtoupper(mb_substr($words[0], 0, 3));

        } elseif ($total_words <= 4) {

            foreach ($words as $word) {

                $initials .= strtoupper(mb_substr($word, 0, 1));

            }

        } else {

            for ($i = 0; $i < 4; $i++) {

                $initials .= strtoupper(mb_substr($words[$i], 0, 1));

            }

            for ($i = 4; $i < $total_words; $i++) {

                $initials .= strtoupper(mb_substr($words[$i], 0, 1));

            }

        }

        // Suffix by keyword

        $suffix_map = [

            'pareja'   => '22',

            'amigos'   => '22',

            'trio'     => '33',

            'familiar' => '44',

            'fiesta'   => '66',

        ];

        $suffix = '1'; // Default if none matched

        foreach ($suffix_map as $keyword => $code) {

            if (stripos($name, $keyword) !== false) {

                $suffix = $code;

                break;

            }

        }

        $sku_base = $initials . '-' . $suffix;

        $sku = $sku_base;

        // Ensure uniqueness

        $existing_product_id = wc_get_product_id_by_sku($sku);

        if ($existing_product_id && $existing_product_id !== $product->get_id()) {

            $sku .= '-' . $product->get_id();

        }

        // Save SKU

        $product->set_sku($sku);

        $product->save();

    }

    // ❌ Don't echo or exit — let page load naturally

});