<?php
//namespace NanoMvc;

/**
 * Classe pour la reponse.
 *
 * Copyright (C) 2008  Nicolas Joseph
 *
 * LICENSE:
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @package    NanoMvc
 * @author     Nicolas Joseph <gege2061@redaction-developpez.com>
 * @copyright  2008 Nicolas Joseph
 * @license    http://www.opensource.org/licenses/gpl-3.0.html GPL v3
 * @filesource
 */

$path = dirname (__FILE__);
require_once ($path .'/helper/page.php');

class Response
{
  /**
   * @var Response
   */
  private static $instance = null;
  /**
   * @var string
   */
  private $body = '';
  /**
   * @var array
   */
  private $headers = array();

  private function __construct ()
  {
  }

  /**
   * Obtenir l'unique instance de la classe.
   *
   * @return Response
   */
  public static function get_instance ()
  {
    if (is_null (self::$instance))
    {
      self::$instance = new self ();
    }
    return self::$instance;
  }

  /**
   * Modifie le corps de la page.
   *
   * @param string body: le corps de la page
   */
  public function set_body ($body)
  {
    $this->body = $body;
  }

  /**
   * Met en place une redirection a partir d'une url.
   *
   * @param string url: l'adresse de redirection
   * @param bool permanent: redirection permanente, ou non
   */
	public function redirect_url ($url, $permanent = false)
	{
    if (!$this->headers_sent ())
    {
      if ($permanent)
      {
        $this->headers['Status'] = '301 Moved Permanently';
      }
      else
      {
        $this->headers['Status'] = '302 Found';
      }
      $this->headers['location'] = $url;
    }
    else
    {
      throw new Exception ('L\'entete a deja ete envoyee !');
    }
	}

  /**
   * Met en place une redirection.
   *
   * @param string page: page
   * @param string action: action
   * @param bool permanent: redirection permanente, ou non
   */
	public function redirect ($page='', $action='', $permanent = false)
	{
	  $url = Helper_Page::get_url ($page, $action);
	  $this->redirect_url ($url, $permanent);
	}

  public function set_header ($key, $value)
  {
    if (!$this->headers_sent ())
    {
      $this->headers[$key] = $value;
    }
    else
    {
      throw new Exception ('L\'entete a deja ete envoyee !');
    }
  }

  public function not_found ()
  {
    $this->set_header ('HTTP/1.0', '404 Not Found');
  }

  /**
   * Verifie si l'entete a deja ete envoye.
   *
   * @return bool
   */
  public function headers_sent ()
  {
    return headers_sent ();
  }

  /**
   * Affiche la reponse.
   */
  public function print_out ()
  {
    foreach ($this->headers as $key => $value)
    {
      if ($key == 'HTTP/1.0')
      {
        header ($key .' '. $value);
      }
      else
      {
        header ($key .':'. $value);
      }
    }
    echo $this->body;
  }
}