<?php

/*
 * User Role Editor WordPress plugin
 * Author: Vladimir Garagulya
 * Email: support@role-editor.com
 * License: GPLv2 or later
 */


/**
 * Process AJAX requrest from User Role Editor
 *
 * @author vladimir
 */
class URE_Ajax_Processor {

    protected $lib = null;
    

    public function __construct($lib) {
        
        $this->lib = $lib;
        
    }
    // end of __construct()
    
    
    protected function ajax_check_permissions() {
        
        if (!wp_verify_nonce($_REQUEST['wp_nonce'], 'user-role-editor')) {
            echo json_encode(array('result'=>'error', 'message'=>'URE: Wrong or expired request'));
            die;
        }
        
        $key_capability = $this->lib->get_key_capability();
        if (!current_user_can($key_capability)) {
            echo json_encode(array('result'=>'error', 'message'=>'URE: Insufficient permissions'));
            die;
        }
        
    }
    
    
    protected function get_users_without_role() {
        global $wp_roles;
        
        $new_role = filter_input(INPUT_POST, 'new_role', FILTER_SANITIZE_STRING);
        if (empty($new_role)) {
            $answer = array('result'=>'failure', 'message'=>'Provide new role');
            return $answer;
        }
        if ($new_role==='no_rights') {
            $this->lib->create_no_rights_role();
        }        
        
        if (!isset($wp_roles)) {
            $wp_roles = new WP_Roles();
        }
        if (!isset($wp_roles->roles[$new_role])) {
            $answer = array('result'=>'failure', 'message'=>'Selected new role does not exist');
            return $answer;
        }
        
        $users = $this->lib->get_users_without_role();    
        $answer = array('result'=>'success', 'users'=>$users, 'new_role'=>$new_role, 'message'=>'success');
        
        return $answer;
    }
    // end of get_users_without_role()
    
    
    protected function _dispatch($action) {
        switch ($action) {
            case 'get_users_without_role':
                $answer = $this->get_users_without_role();
                break;
            default:
                $answer = array('result' => 'error', 'message' => 'unknown action "' . $action . '"');
        }
        
        return $answer;
    }
    // end of _dispatch()
    
    
    /**
     * AJAX requests dispatcher
     */    
    public function dispatch() {
        
        $this->ajax_check_permissions();
        
        $action = filter_input(INPUT_POST, 'sub_action', FILTER_SANITIZE_STRING);
        if (empty($action)) {
            $action = filter_input(INPUT_GET, 'sub_action', FILTER_SANITIZE_STRING);
        }

        $answer = $this->_dispatch($action);
        
        $json_answer = json_encode($answer);
        echo $json_answer;
        die;
    }    
    
}
// end of URE_Ajax_Processor