<?php

    //errors reporting On-----------------------------------------
      error_reporting(E_ALL);
      ini_set('display_errors', 1);
    //------------------------------------------------------------

    //Autoload Classes--------------------------------------------
    function my_autoload ($pClassName)
      {
        require_once("Class/" . $pClassName . ".class.php");
      }

    spl_autoload_register("my_autoload");

    //Load Services
    require_once ('Service/Settings.php'); //Настройки
    require_once ('Service/Database.php'); //БД

    //Load external libraries
    include('Html_dom/simple_html_dom.php');
    require_once ('../vendor/autoload.php');
    use ApiAi\Client;
    use ApiAi\Model\Query;
    use ApiAi\Method\QueryApi;
    //--------------------------------------------------------------



    if (!isset($_REQUEST)) {
      return;
    }



    //Get VK notification and decode it
    $data = json_decode(file_get_contents('php://input'));

    //Check "type" of notification
    switch ($data->type)
    {
        //If it is server adress confirmation------------------------
        case 'confirmation':
          //confirm adress
          echo VkBot\Settings\ConfirmationToken;
          break;
          //---------------------------------------------------------



        //If it is a new message-------------------------------------
        case 'message_new':

          //Send "ok" to Callback API server
          echo('ok');

          //Create new User (geting info from users.get)
          $user = new User (json_decode(file_get_contents("https://api.vk.com/method/users.get?user_ids={$data->object->user_id}&v=5.0")), $database);

          //Check if user is already in the database and add them to the DB if no
          if (!$user->Exist())
            {
              $user->Add();
            }


          //Trying to parse natural language with api.ai
          $client = new Client(VkBot\Settings\ApiAiToken);
          $queryApi = new QueryApi($client);

          $meaning = $queryApi->extractMeaning($data->object->body, [
                                               'sessionId' => $data->object->id,
                                               'lang' => 'ru',
                                                                    ]);
          $response = new Query($meaning);


          //Responding to the User's message

          //Array of arguments
          $arguments = array (
                        "database" => $database,                                                              //DB instance
                        "user" => $user,                                                                      //current user
                        "parameters" => $response -> getResult() -> getParameters()                          //parameters from response
                        );


          //Execute operation
          $operation = Operation::initial($response -> getResult() -> getMetadata() -> getIntentName(), $arguments) -> Execute($response -> getResult() -> getFulfillment() -> getSpeech());

        break;
    }
?>