upskill-event-manager/wordpress-dev/wordpress/wp-content/plugins/hvac-community-events/includes/class-hvac-community-events.php

<?php
/**
 * Main plugin class for HVAC Community Events
 */

if (!defined('ABSPATH')) {
    exit;
}

class HVAC_Community_Events {
    /**
     * The single instance of the class
     */
    private static $instance = null;

    /**
     * Main instance
     */
    public static function instance() {
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * Constructor
     */
    public function __construct() {
        $this->define_constants();
        $this->includes();
        $this->init_hooks();
    }

    /**
     * Define constants
     */
    private function define_constants() {
        // Additional constants can be defined here
    }

    /**
     * Include required files
     */
    private function includes() {
        require_once HVAC_CE_PLUGIN_DIR . 'includes/class-hvac-roles.php';
        require_once HVAC_CE_PLUGIN_DIR . 'includes/class-hvac-registration.php';
        require_once HVAC_CE_PLUGIN_DIR . 'includes/class-hvac-settings.php';
        require_once HVAC_CE_PLUGIN_DIR . 'includes/community/class-login-handler.php'; // Add Login Handler
    }

    /**
     * Initialize hooks
     */
    private function init_hooks() {
        // Register activation/deactivation hooks
        register_activation_hook(__FILE__, array($this, 'activate'));
        register_deactivation_hook(__FILE__, array($this, 'deactivate'));

        // Initialize other hooks
        add_action('init', array($this, 'init'));
    }

    /**
     * Plugin activation
     */
    public function activate() {
        // Activation code here
    }

    /**
     * Plugin deactivation
     */
    public function deactivate() {
        // Remove the hvac_trainer role
        $roles = new HVAC_Roles();
        $roles->remove_trainer_role();
        
        // Additional deactivation tasks
        // ...
    }

    /**
     * Initialize plugin
     */
    public function init() {
        // Initialize handlers
        new \HVAC_Community_Events\Community\Login_Handler();

        // Prevent trainers from accessing wp-admin
        add_action('admin_init', array($this, 'redirect_trainers_from_admin'));
    }

    /**
     * Redirect HVAC trainers from admin area to frontend dashboard
     */
    public function redirect_trainers_from_admin() {
        if (defined('DOING_AJAX') && DOING_AJAX) {
            return;
        }

        if (current_user_can('view_hvac_dashboard') && !current_user_can('manage_options')) {
            wp_redirect(home_url('/hvac-trainer-dashboard/'));
            exit;
        }
    }
}