WP-WHMCS-Pricing/whmcs-pricing-plugin/whmcs-pricing.php

<?php
/**
 * Plugin Name: WHMCS Pricing
 * Description: Display WHMCS product pricing via shortcodes. Lightweight, Elementor-compatible.
 * Version: 1.0
 * Author: ArkHost
 * Author URI: https://arkhost.com
 * Sponsored by: Duplika.com
 * Text Domain: whmcs-pricing
 * Domain Path: /languages
 * Requires at least: 5.0
 * Requires PHP: 7.4
 * License: GPL v2 or later
 */

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

// Define plugin constants
define('WHMCS_PRICING_VERSION', '1.0');
define('WHMCS_PRICING_PLUGIN_DIR', plugin_dir_path(__FILE__));
define('WHMCS_PRICING_PLUGIN_URL', plugin_dir_url(__FILE__));
define('WHMCS_PRICING_PLUGIN_BASENAME', plugin_basename(__FILE__));

/**
 * Main plugin class
 */
class WHMCS_Pricing_Plugin {

    /**
     * Single instance of the class
     */
    private static $instance = null;

    /**
     * Get instance
     */
    public static function get_instance() {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * Constructor
     */
    private function __construct() {
        $this->load_dependencies();
        $this->init_hooks();
    }

    /**
     * Load required files
     */
    private function load_dependencies() {
        require_once WHMCS_PRICING_PLUGIN_DIR . 'includes/api-handler.php';
        require_once WHMCS_PRICING_PLUGIN_DIR . 'includes/shortcodes.php';

        if (is_admin()) {
            require_once WHMCS_PRICING_PLUGIN_DIR . 'includes/admin-settings.php';
        }
    }

    /**
     * Initialize hooks
     */
    private function init_hooks() {
        add_action('plugins_loaded', array($this, 'load_textdomain'));

        // Add settings link on plugins page
        add_filter('plugin_action_links_' . WHMCS_PRICING_PLUGIN_BASENAME, array($this, 'add_settings_link'));

        // Make author link open in new tab
        add_filter('plugin_row_meta', array($this, 'modify_plugin_row_meta'), 10, 2);

        // Initialize components
        if (is_admin()) {
            WHMCS_Pricing_Admin::get_instance();
        }

        WHMCS_Pricing_Shortcodes::get_instance();
    }

    /**
     * Add settings link on plugins page
     */
    public function add_settings_link($links) {
        $settings_link = '<a href="' . esc_url(admin_url('options-general.php?page=whmcs-pricing')) . '">' . __('Settings', 'whmcs-pricing') . '</a>';
        array_unshift($links, $settings_link);
        return $links;
    }

    /**
     * Modify plugin row meta to open author link in new tab
     */
    public function modify_plugin_row_meta($links, $file) {
        if ($file === WHMCS_PRICING_PLUGIN_BASENAME) {
            // Add target="_blank" to author link
            $links = array_map(function($link) {
                if (strpos($link, 'arkhost.com') !== false) {
                    return str_replace('<a href=', '<a target="_blank" rel="noopener noreferrer" href=', $link);
                }
                return $link;
            }, $links);
        }
        return $links;
    }

    /**
     * Load plugin textdomain
     */
    public function load_textdomain() {
        load_plugin_textdomain('whmcs-pricing', false, dirname(WHMCS_PRICING_PLUGIN_BASENAME) . '/languages');
    }

    /**
     * Activate plugin
     */
    public static function activate() {
        // Set default options
        $defaults = array(
            'api_url' => '',
            'api_identifier' => '',
            'api_secret' => '',
            'cache_duration' => 3600, // 1 hour
            'default_currency' => 'USD',
            'show_decimals' => true,
            'debug_mode' => false
        );

        add_option('whmcs_pricing_settings', $defaults);
    }

    /**
     * Deactivate plugin
     */
    public static function deactivate() {
        // Clear all cached data
        WHMCS_Pricing_API::clear_all_cache();
    }
}

/**
 * Activation hook
 */
register_activation_hook(__FILE__, array('WHMCS_Pricing_Plugin', 'activate'));

/**
 * Deactivation hook
 */
register_deactivation_hook(__FILE__, array('WHMCS_Pricing_Plugin', 'deactivate'));

/**
 * Initialize plugin
 */
function whmcs_pricing_init() {
    return WHMCS_Pricing_Plugin::get_instance();
}

// Start the plugin
whmcs_pricing_init();