Free shipping and gift message Woocommerce

and programmatically add gift to cart

          

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          //free shipping  and present notification 
add_action( 'woocommerce_before_checkout_form', function() {
    echo custom_checkout_page_notice();
});
add_action( 'woocommerce_before_cart', function() {
    echo custom_checkout_page_notice();
});

add_shortcode('free_shipping_message', function() {
    if ( ! WC()->cart ) return '';
    return custom_checkout_page_notice();
});


function custom_checkout_page_notice() {
    $free_shipping_threshold = 50;
    $gift_threshold = 60;

    $cart = WC()->cart;
    if ( ! $cart ) return;

    // Final subtotal after coupons, without shipping or fees
    $current_cart_total = $cart->get_cart_contents_total();

    if ( $current_cart_total <= 0 ) {
        $message = 'Δωρεάν μεταφορικά με αγορές άνω των ' . strip_tags( wc_price( $free_shipping_threshold ) ) . '!';
    } elseif ( $current_cart_total > 0 && $current_cart_total < $free_shipping_threshold ) {
        $remaining_amount = $free_shipping_threshold - $current_cart_total;
        $message = 'Ακόμη ' . strip_tags( wc_price( $remaining_amount ) ) . ' για δωρεάν μεταφορικά! <a href="' . esc_url( wc_get_page_permalink( 'shop' ) ) . '">Ψώνισε</a>';
    } elseif ( $current_cart_total >= $free_shipping_threshold && $current_cart_total < $gift_threshold ) {
        $remaining_amount = $gift_threshold - $current_cart_total;
        $message = 'Έχεις δωρεάν μεταφορικά! Ακόμη ' . strip_tags( wc_price( $remaining_amount ) ) . ' για Δώρο Έκπληξη! <a href="' . esc_url( wc_get_page_permalink( 'shop' ) ) . '">Ψώνισε</a>';
    } else {
        $message = 'Έχεις δωρεάν μεταφορικά & Δώρο Έκπληξη!';
    }

    return '<div class="woocommerce-message">' . wp_kses_post( $message ) . '</div>';
}



function maybe_handle_gift_product() {
    $gift_product_id = 3444;
    $threshold = 60;
    $cart = WC()->cart;

    if ( is_admin() || ! $cart ) return;

    // Get the amount before shipping and fees, but after discounts (i.e. final subtotal after coupons)
    $cart_total = $cart->get_cart_contents_total();

    $gift_in_cart = false;
    $gift_key = '';

    foreach ( $cart->get_cart() as $key => $item ) {
        if ( $item['product_id'] == $gift_product_id ) {
            $gift_in_cart = true;
            $gift_key = $key;
            break;
        }
    }

    if ( $cart_total >= $threshold ) {
        if ( ! $gift_in_cart ) {
            $cart->add_to_cart( $gift_product_id, 1, 0, [], [ 'is_auto_gift' => true ] );
        }
    } else {
        if ( $gift_in_cart ) {
            $cart->remove_cart_item( $gift_key );
        }
    }
}
add_action( 'woocommerce_cart_updated', 'maybe_handle_gift_product' );



function prevent_manual_gift_product_addition( $passed, $product_id, $quantity, $variation_id = null, $variations = null, $cart_item_data = [] ) {
    if ( $product_id == 3444 && empty( $cart_item_data['is_auto_gift'] ) ) {
        wc_add_notice( 'Αυτό το προϊόν δεν μπορεί να προστεθεί στο καλάθι χειροκίνητα.', 'error' );
        return false;
    }
    return $passed;
}
add_filter( 'woocommerce_add_to_cart_validation', 'prevent_manual_gift_product_addition', 10, 6 );
          

            
              How to use this
            
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