<?php

/*

  Belokan Micro Framework

  Licensed under GNU GPL

  http://gitorious.org/belokan

  ---

  Belokan/Request.php:

  Request tool

*/

class Belokan_Request {

  private static

    $_instance,

    $_controller,

    $_action,

    $_format,

    $_params,

    $_browser,

    $_method,

    $_xhr,

    $_reload,

    $_fromElsewhere,

    $_headers,

    $_body;

  public static function getInstance ()

  {

    if (self::$_instance === null)

      self::$_instance = new self;

    return self::$_instance;

  }

  public function __construct ()

  {

    if (!isset($_SERVER['REDIRECT_URL']) || empty($_SERVER['REDIRECT_URL'])) {

      $uri = $_SERVER['REQUEST_URI'];

      if (!empty($_SERVER['QUERY_STRING']))

        $uri = substr($uri, 0, -strlen('?'.$_SERVER['QUERY_STRING']));

    } else $uri = $_SERVER['REDIRECT_URL'];

    $uri = substr($uri, strlen(Belokan_Config::getInstance()->get('path')));

    $uri = explode('/', $uri);

    $formatConfig = Belokan_Config::getInstance()->get('format');

    $count = count($uri);

    if ($formatConfig['enabled'] && ($dot = strrpos($uri[$count-1], '.'))) {

      $this->_format = substr($uri[$count - 1], $dot+1);

      $this->_params['_lastWithFormat'] = $uri[$count - 1];

      $uri[$count - 1] = substr($uri[$count - 1], 0, $dot);

    } else $this->_format = $formatConfig['default'];

    $this->_controller = (isset($uri[1]) && !empty($uri[1])) ? ucfirst($uri[1]) : 'Home';

    $this->_action = (isset($uri[2]) && !empty($uri[2])) ? $uri[2] : 'default';

    if (isset($uri[3]) && strlen($uri[3])) {

      $this->_params = array();

      for ($i=3; $i < $count; $i++) $this->_params[$i-3] = $uri[$i];

    } else $this->_params = null;

    $this->_browser = null;

    $this->_method = null;

    $this->_xhr = null;

    $this->_reload = null;

    $this->_fromElsewhere = null;

    $this->_headers = null;

    $this->_body = null;

  }

  public function getController ()

  {

    return $this->_controller;

  }

  public function getAction ()

  {

    return $this->_action;

  }

  public function getFormat ()

  {

    return $this->_format;

  }

  public function getParams ()

  {

    return $this->_params;

  }

  public function paramExists ($param)

  {

    if ($this->_params != null) {

      if (array_key_exists($param, $this->_params)) return true;

      if (($pos = array_search($param, $this->_params)) !== false) {

        $this->_params[$param] = $this->_params[$pos+1];

        return true;

      }

      return false;

    }

    return false;

  }

  public function getParam ($param)

  {

    if ($this->paramExists($param)) return $this->_params[$param];

    else return null;

  }

  public function getBrowser ()

  {

    if ($this->_browser === null) {

      if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false)

        $this->_browser = 'ie';

      else if (strpos($_SERVER['HTTP_USER_AGENT'], 'Opera') !== false)

        $this->_browser = 'opera';

      else if (strpos($_SERVER['HTTP_USER_AGENT'], 'Chrome') !== false)

        $this->_browser = 'chrome';

      else if (strpos($_SERVER['HTTP_USER_AGENT'], 'WebKit') !== false)

        $this->_browser = 'webkit';

      else if (strpos($_SERVER['HTTP_USER_AGENT'], 'Gecko') !== false)

        $this->_browser = 'gecko';

      else $this->_browser = 'other';

    }

    return $this->_browser;

  }

  public function browserIsMSIE ()

  {

    return $this->getBrowser() == 'ie';

  }

  public function getMethod ()

  {

    if ($this->_method === null)

      $this->_method = strtoupper($_SERVER['REQUEST_METHOD']);

    return $this->_method;

  }

  public function isPost ()

  {

    return $this->getMethod() == 'POST';

  }

  public function isGet ()

  {

    return $this->getMethod() == 'GET';

  }

  public function isPut ()

  {

    return $this->getMethod() == 'PUT';

  }

  public function isDelete ()

  {

    return $this->getMethod() == 'DELETE';

  }

  public function isHead ()

  {

    return $this->getMethod() == 'HEAD';

  }

  public function isAjax ()

  {

    if ($this->_xhr === null)

      $this->_xhr = (isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&

                     $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest');

    return $this->_xhr;

  }

  public function isReload ()

  {

    if ($this->_reload === null)

      $this->_reload = (isset($_SERVER['HTTP_CACHE_CONTROL']) && strpos($_SERVER['HTTP_CACHE_CONTROL'], 'max-age=0') !== false) ||

        (isset($_SERVER['HTTP_PRAGMA']) && strpos($_SERVER['HTTP_PRAGMA'], 'no-cache'));

    return $this->_reload;

  }

  public function comeFromElsewhere ()

  {

    if ($this->_fromElsewhere === null)

      $this->_fromElsewhere = (!isset($_SERVER['HTTP_REFERER']) ||

        strpos($_SERVER['HTTP_REFERER'], 'http://'.$_SERVER['HTTP_HOST']) === false);

    return $this->_fromElsewhere;

  }

  public function getHeaders ()

  {

    if ($this->_headers === null)

      foreach ($_SERVER as $k => $v)

        if (substr($k, 0, 5) == 'HTTP_')

          $this->_headers[substr($k, 5)] = $v;

    return $this->_headers;

  }

  public function getBody ()

  {

    if ($this->_body === null)

      $this->_body = file_get_contents('php://input');

    return $this->_body;

  }

}