<?php

class RscDtgs_Http_Request
{
  /**
   * @var RscDtgs_Http_Parameters
   */
  public $post;

  /**
   * @var RscDtgs_Http_Parameters
   */
  public $query;

  /**
   * @var RscDtgs_Http_Parameters
   */
  public $files;

  /**
   * @var RscDtgs_Http_ServerParameters
   */
  public $server;

  /**
   * @var RscDtgs_Http_Parameters
   */
  public $headers;

  /**
   * Constructor
   */
  public function __construct()
  {
    $postTempVar = $_POST;
    if (!empty($_POST) && is_string($_POST)) {
      $postTempVar = unserialize($_POST);
    }
    if (!is_array($postTempVar)) {
      $postTempVar = [];
    }
    $this->post = new RscDtgs_Http_Parameters($postTempVar);
    $this->query = new RscDtgs_Http_Parameters($_GET);
    $this->files = new RscDtgs_Http_Parameters($_FILES);
    $this->server = new RscDtgs_Http_ServerParameters($_SERVER);
    $this->headers = new RscDtgs_Http_Parameters($this->server->getHeaders());
  }

  /**
   * Returns new request from the global variables
   * @return RscDtgs_Http_Request
   */
  public static function create()
  {
    return new self();
  }

  /**
   * Is XMLHttpRequest?
   * @return bool
   */
  public function isXmlHttpRequest()
  {
    return $this->server->has('X_REQUESTED_WITH') && 'XMLHttpRequest' === $this->server->get('X_REQUESTED_WITH');
  }

  /**
   * Is AJAX request?
   * @return bool
   */
  public function isAjax()
  {
    return $this->isXmlHttpRequest();
  }

  /**
   * Returns an array of supported locales of the user or null if this data are not specified
   * @return array|null
   */
  public function getUserLocales()
  {
    preg_match_all('/[a-z]{2}-[A-Z]{2}/', $this->headers->get('ACCEPT_LANGUAGE'), $locales);

    return isset($locales[0]) ? $locales[0] : null;
  }

  /**
   * Returns an array of supported languages of the user or NULL if this data are not specified
   * @return array|null
   */
  public function getUserLanguages()
  {
    $languages = [];

    if (null === ($locales = $this->getUserLocales())) {
      return null;
    }

    foreach ($locales as $locale) {
      $languages[] = reset(explode('-', $locale));
    }

    return $languages;
  }

  /**
   * Returns the name of the browser
   * @return string|null
   */
  public function getUserAgent()
  {
    $userAgent = $this->headers->get('USER_AGENT');

    preg_match_all('/msie|firefox|safari|opera|chrome/i', $userAgent, $browser);

    return isset($browser[0]) ? reset($browser[0]) : null;
  }

  /**
   * Checks whether specified browser name equals to the user's browser
   * @param string $browser Name of the browser
   * @return bool
   */
  public function isBrowser($browser)
  {
    return strtolower($browser) === strtolower($this->getUserAgent());
  }

  /**
   * Returns the name of the user operating system
   * @return string|null
   */
  public function getUserOs()
  {
    $userAgent = $this->headers->get('USER_AGENT');

    preg_match_all('/windows|macintosh|linux|freebsd|unix|iphone/i', $userAgent, $os);

    return isset($os[0]) ? reset($os[0]) : null;
  }
}
