<?php
/**
 * Plugin Name: WooCommerce Prevent Repeat Purchases
 * Description: Prevents customers from purchasing products they've already bought.
 * Version: 1.0.0
 * Author: Your Name
 */

// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Check if product was previously purchased before adding to cart
 */
function check_if_product_previously_purchased($passed, $product_id) {
    // Skip check if user is not logged in
    if (!is_user_logged_in()) {
        return $passed;
    }

    $current_user_id = get_current_user_id();
    
    // Get all customer orders
    $customer_orders = wc_get_orders(array(
        'customer_id' => $current_user_id,
        'status'      => array('wc-completed', 'wc-processing'),
        'limit'       => -1, // Get all orders
    ));
    
    // Check each order to see if this product was previously purchased
    foreach ($customer_orders as $order) {
        foreach ($order->get_items() as $item) {
            // If product ID matches the current product being added to cart
            if ($item->get_product_id() == $product_id) {
                // Product was previously purchased, prevent adding to cart
                wc_add_notice(
                    sprintf(
                        __('You\'ve already purchased %s in a previous order (#%s). This product can only be purchased once.', 'woocommerce'),
                        get_the_title($product_id),
                        $order->get_order_number()
                    ),
                    'error'
                );
                
                return false;
            }
        }
    }
    
    // Product hasn't been purchased before, allow adding to cart
    return $passed;
}
add_filter('woocommerce_add_to_cart_validation', 'check_if_product_previously_purchased', 10, 2);

/**
 * Display a notice on the product page if the customer has already purchased this product
 */
function display_already_purchased_notice() {
    if (!is_user_logged_in() || !is_product()) {
        return;
    }
    
    global $product;
    $product_id = $product->get_id();
    $current_user_id = get_current_user_id();
    
    // Get all customer orders
    $customer_orders = wc_get_orders(array(
        'customer_id' => $current_user_id,
        'status'      => array('wc-completed', 'wc-processing'),
        'limit'       => -1, // Get all orders
    ));
    
    // Check each order to see if this product was previously purchased
    foreach ($customer_orders as $order) {
        foreach ($order->get_items() as $item) {
            // If product ID matches the current product
            if ($item->get_product_id() == $product_id) {
                // Display notice that product was previously purchased
                wc_print_notice(
                    sprintf(
                        __('You\'ve already purchased this product in order #%s on %s. This product can only be purchased once.', 'woocommerce'),
                        $order->get_order_number(),
                        $order->get_date_created()->date_i18n(get_option('date_format'))
                    ),
                    'notice'
                );
                
                return;
            }
        }
    }
}
add_action('woocommerce_before_single_product', 'display_already_purchased_notice');