JezK

Edit File: free-delivery-manager.php

<?php
/**
 * Plugin Name: Single Product Free Delivery Manager
 * Description: Offer free delivery for specific products. Hides all other shipping methods when free delivery is active. All code is contained in this single file.
 * Version: 1.1
 * Author: Gemini
 */

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

// 1. Create Admin Menu
add_action('admin_menu', 'spfd_add_admin_menu');
function spfd_add_admin_menu() {
    add_submenu_page(
        'woocommerce', // Placed under the main WooCommerce menu
        'Free Delivery Products',
        'Free Delivery',
        'manage_woocommerce',
        'spfd-free-delivery',
        'spfd_settings_page'
    );
}

// 2. Enqueue WooCommerce AJAX Search Scripts (For auto-search)
add_action('admin_enqueue_scripts', 'spfd_enqueue_admin_scripts');
function spfd_enqueue_admin_scripts($hook) {
    if ($hook !== 'woocommerce_page_spfd-free-delivery') return;
    wp_enqueue_script('wc-enhanced-select');
    wp_enqueue_style('woocommerce_admin_styles');
}

// 3. Admin Page Layout and Save Logic
function spfd_settings_page() {
    // Save data when the form is submitted
    if (isset($_POST['spfd_save'])) {
        $products = isset($_POST['spfd_products']) ? array_map('intval', $_POST['spfd_products']) : array();
        update_option('spfd_free_products', $products);
        echo '<div class="notice notice-success is-dismissible"><p>Settings saved successfully!</p></div>';
    }
    
    // Fetch previously saved products
    $selected_products = get_option('spfd_free_products', array());
    ?>
    <div class="wrap">
        <h1>Free Delivery Management</h1>
        <p>Search and select the products that will be eligible for free delivery.</p>
        
        <form method="post">
            <table class="form-table">
                <tr>
                    <th><label for="spfd_products">Search & Select Products:</label></th>
                    <td>
                        <select class="wc-product-search" multiple="multiple" style="width: 50%;" id="spfd_products" name="spfd_products[]" data-placeholder="Type product name..." data-action="woocommerce_json_search_products_and_variations">
                            <?php
                            foreach ($selected_products as $product_id) {
                                $product = wc_get_product($product_id);
                                if (is_object($product)) {
                                    echo '<option value="' . esc_attr($product_id) . '" selected="selected">' . wp_kses_post($product->get_formatted_name()) . '</option>';
                                }
                            }
                            ?>
                        </select>
                        <p class="description">Type letter by letter to auto-search products. You can select multiple products.</p>
                    </td>
                </tr>
            </table>
            <?php submit_button('Save Settings', 'primary', 'spfd_save'); ?>
        </form>
    </div>
    <?php
}

// 4. Control Shipping Rates on Checkout (Logic for hiding other methods)
add_filter('woocommerce_package_rates', 'spfd_modify_shipping_rates', 10, 2);
function spfd_modify_shipping_rates($rates, $package) {
    $free_products = get_option('spfd_free_products', array());
    
    // If no products are set for free delivery, continue with regular shipping
    if (empty($free_products) || empty($rates)) return $rates;

$all_free = true;

// Check items currently in the cart
    foreach ($package['contents'] as $cart_item) {
        $product_id = $cart_item['product_id'];
        
        // For variable products, we check the parent product ID
        if ( $cart_item['variation_id'] > 0 ) {
             $product_id = $cart_item['product_id']; 
        }
        
        // If the cart contains a product NOT in our free delivery list
        if (!in_array($product_id, $free_products)) {
            $all_free = false;
            break; // One normal product is enough to disable free delivery
        }
    }

// If ALL products in the cart are eligible for free delivery
    if ($all_free) {
        $single_free_rate = array(); // Create a new empty array for shipping rates
        
        foreach ($rates as $rate_key => $rate) {
            // Take the very first available shipping method and convert it to Free Delivery
            $rates[$rate_key]->cost = 0; 
            $rates[$rate_key]->taxes = array(); 
            $rates[$rate_key]->label = 'Free Delivery'; 
            
            // Assign only this modified rate to our new array
            $single_free_rate[$rate_key] = $rates[$rate_key];
            
            break; // Stop the loop immediately so no other methods are added
        }
        
        // Return only the single free delivery option, effectively hiding the rest
        return $single_free_rate;
    }

// If there are mixed products, return the default paid rates.
    return $rates;
}
?>