add_action('woocommerce_before_calculate_totals', 'custom_multi_discount_rules', 9999);
function custom_multi_discount_rules( $cart ) {

    if ( is_admin() && ! defined('DOING_AJAX') ) return;

    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {

        if ( empty($cart_item['data']) ) continue;

        $product      = $cart_item['data'];
        $product_id   = (int) $cart_item['product_id'];
        $variation_id = !empty($cart_item['variation_id']) ? (int)$cart_item['variation_id'] : 0;
        $qty          = (int) $cart_item['quantity'];

        // Basispreis frisch holen
        $base_id = $variation_id ? $variation_id : $product_id;
        $fresh_product = wc_get_product($base_id);

        if ( !$fresh_product ) continue;

        $base_price = (float) $fresh_product->get_price();

        // =====================================
        // REGEL 1: Polster polyester ab 3 Stück
        // =====================================
        if (
            isset($cart_item['variation']['attribute_pa_polster']) &&
            strtolower($cart_item['variation']['attribute_pa_polster']) === 'polyester' &&
            $qty >= 3
        ) {
            $product->set_price( max($base_price - 4, 0) );
            continue;
        }

        // =====================================
        // REGEL 2: Fototasse ID 189
        // ab 3 Stück mit gleicher Nummer
        // =====================================
        if ( $product_id === 189 ) {

            $bildnummer = '';

            if ( isset($cart_item['product_extras']['groups']) ) {

                foreach ( $cart_item['product_extras']['groups'] as $group ) {
                    foreach ( $group as $field ) {

                        if ( !empty($field['value']) ) {
                            if ( preg_match('/(\d{7})/', $field['value'], $matches) ) {
                                $bildnummer = $matches[1];
                                break 2;
                            }
                        }
                    }
                }
            }

            if ( !empty($bildnummer) && $qty >= 3 ) {

                // aktueller Preis inkl. Add-ons
                $current_price = (float) $product->get_price();
                $new_price = max( $current_price - 4, 0 );

                $product->set_price( $new_price );
                continue;
            }
        }

        // =====================================
        // REGEL 3: Schlüsselanhänger ID 322
        // ab 3 Stück mit gleicher Nummer
        // =====================================
        if ( $product_id === 322 ) {

            $bildnummer = '';

            if ( isset($cart_item['product_extras']['groups']) ) {

                foreach ( $cart_item['product_extras']['groups'] as $group ) {
                    foreach ( $group as $field ) {

                        if ( !empty($field['value']) ) {
                            if ( preg_match('/(\d{7})/', $field['value'], $matches) ) {
                                $bildnummer = $matches[1];
                                break 2;
                            }
                        }
                    }
                }
            }

            if ( !empty($bildnummer) && $qty >= 3 ) {

                // aktueller Preis inkl. Add-ons
                $current_price = (float) $product->get_price();
                $new_price = max( $current_price - 4, 0 );

                $product->set_price( $new_price );
                continue;
            }
        }
    }
}


// =====================================
// Rabatt-Hinweis anzeigen
// =====================================
add_filter('woocommerce_get_item_data', 'custom_discount_notice_cart_multi', 10, 2);
function custom_discount_notice_cart_multi($item_data, $cart_item) {

    $qty = isset($cart_item['quantity']) ? (int)$cart_item['quantity'] : 0;
    $product_id = (int)$cart_item['product_id'];

    // Polster
    if (
        $qty >= 3 &&
        isset($cart_item['variation']['attribute_pa_polster']) &&
        strtolower($cart_item['variation']['attribute_pa_polster']) === 'polyester'
    ) {
        $item_data[] = array(
            'name'  => 'Rabatt',
            'value' => 'Mengenrabatt (-4€ pro Stück)'
        );
    }

    // Fototasse
    if ( $product_id === 189 && $qty >= 3 ) {
        $item_data[] = array(
            'name'  => 'Rabatt',
            'value' => 'Fototassen-Rabatt (-4€ pro Stück)'
        );
    }

    // Schlüsselanhänger
    if ( $product_id === 322 && $qty >= 3 ) {
        $item_data[] = array(
            'name'  => 'Rabatt',
            'value' => 'Schlüsselanhänger-Rabatt (-4€ pro Stück)'
        );
    }

    return $item_data;
}<?xml version="1.0" encoding="UTF-8"?>
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