<?php

namespace Lib;

class Controller_base
{

    public function __construct()
    {
        if (defined('DEBUG_SLOW_DOWN_AJAX') && $this->is_ajax_request()) {
            // microseconds 1 sec = 1000000 microsecond
            usleep(DEBUG_SLOW_DOWN_AJAX * 1000);
        }
    }

    public function set_no_cache($set_no_cache = true)
    {
        if (!$set_no_cache) {
            return;
        }
        header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
        header("Cache-Control: no-cache, must-revalidate");
    }

    public function set_javascript_content_type()
    {
        header('Content-Type: application/x-javascript; charset=UTF-8');
    }

    public function set_json_content_type()
    {
        if (defined('DEBUG')) {
            header('Content-Type: application/x-javascript; charset=UTF-8');
        } else {
            header('Content-Type: application/json');
        }
    }

    public function is_ajax_request()
    {
        return (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && ($_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest'));
    }

    public function send_json($php_var, $set_no_cache = true)
    {
        $this->set_no_cache($set_no_cache);
        $this->set_json_content_type();
        echo Json::encode($php_var);
    }

    public function send_javascript_var($var_name, $php_var, $add_var_text = true, $set_no_cache = true)
    {
        $this->set_no_cache($set_no_cache);
        $this->set_javascript_content_type();
        echo Json::get_var($var_name, $php_var, $add_var_text);
    }
}