How AI Helped Us to Improve our Previous WordPress Plugins: A Comprehensive Overview

<?php
/*
Plugin Name: Product Availability and Discount Plugin
Description: A simple plugin to check product availability and apply discount.
Version: 1.1
Author: The Right Software
*/

define('DEFAULT_DISCOUNT_PERCENTAGE', 10); // Use constants for default values

/**
 * Checks product availability based on stock status.
 *
 * @param int $product_id The product ID.
 * @return bool True if the product is in stock, otherwise false.
 */
function check_product_availability($product_id) {
    $availability = get_post_meta($product_id, '_stock_status', true);
    return ($availability === 'instock');
}

/**
 * Applies discount to the product price if valid.
 *
 * @param float $price The original product price.
 * @param int $discount_percentage The discount percentage.
 * @return float The discounted price.
 */
function apply_discount($price, $discount_percentage) {
    if (!is_numeric($price) || $price <= 0) {
        return $price; // Return original price if invalid
    }

    // Ensure the discount percentage is within the valid range
    $discount_percentage = max(0, min(100, $discount_percentage));
    return $price - ($price * $discount_percentage / 100);
}

/**
 * Displays the discounted price if product is available.
 *
 * @param int $product_id The product ID.
 */
function display_product_discount($product_id) {
    $price = get_post_meta($product_id, '_regular_price', true);
    
    // Check if product price is valid
    if (!is_numeric($price) || $price <= 0) {
        echo 'Invalid product price.';
        return;
    }

    $discount_percentage = apply_filters('custom_discount_percentage', DEFAULT_DISCOUNT_PERCENTAGE); // Allow dynamic discount
    $is_available = check_product_availability($product_id);
    
    if ($is_available) {
        $discounted_price = apply_discount($price, $discount_percentage);
        echo 'Price after ' . $discount_percentage . '% discount: ' . wc_price($discounted_price);
    } else {
        echo 'This product is out of stock.';
    }
}

add_action('woocommerce_single_product_summary', 'display_product_discount', 25);
?>