<?php

/*
 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
 * output.php - Controls output format, messages of death, that kind of stuff
 * Copyright (C) 2006-2009 Dan Fuhry
 *
 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2 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 details.
 */

/**
 * Abstract class to define how output handlers should act.
 * @package Enano
 * @subpackage UI
 */

abstract class Output_Base
{
  /**
   * Page title
   * @var string
   */
  
  public $title = 'Untitled';
  
  /**
   * To allow scripts to determine whether we are outputting headers or not.
   * @var bool
   */
  
  public $naked = false;
  
  /**
   * Added content
   * @var string
   * @var string
   * @var string
   * @var string
   */
  
  public $before_header = '', $after_header = '', $before_footer = '', $after_footer = '';
  
  /**
   * Call this to send content headers (e.g. the first third of the document if HTML) in place of $template->header().
   * @access public
   */
  
  abstract public function header();
  
  /**
   * Call this to send extra stuff after the content (equivalent of $template->footer()).
   * @access public
   */
  
  abstract public function footer();
  
  /**
   * Add some code just before the header.
   * @access public
   */
  
  public function add_before_header($code)
  {
    $this->before_header .= $code;
  }
  
  /**
   * Add some code just after the header.
   * @access public
   */
  
  public function add_after_header($code)
  {
    $this->after_header .= $code;
  }
  
  /**
   * Add some code just before the footer.
   * @access public
   */
  
  public function add_before_footer($code)
  {
    $this->before_footer .= $code;
  }
  
  /**
   * Add some code just after the footer.
   * @access public
   */
  
  public function add_after_footer($code)
  {
    $this->after_footer .= $code;
  }
  
  /**
   * Send any required HTML headers through, e.g. Content-type.
   * @access public
   */
  
  public function http_headers()
  {
    header('Content-type: text/html');
  }
  
  /**
   * Set the title of the page being output.
   * @param string Page name
   */
  
  public function set_title($title)
  {
    $this->title = $title;
  }
  
  /**
   * Avoid sending things out of order.
   * @var bool
   * @var bool
   */
  
  public $headers_sent = false, $footers_sent = false;
}

/**
 * HTML outputter.
 */

class Output_HTML extends Output_Base
{
  public function header()
  {
    if ( $this->headers_sent )
      return;
    
    $this->headers_sent = true;
    
    ob_start();
  }
  
  public function footer()
  {
    global $template;
    if ( !$this->headers_sent )
      return;
    
    $this->headers_sent = false;
    $content = ob_get_contents();
    ob_end_clean();
    
    ob_start();
    echo $this->before_header;
    echo $template->getHeader();
    echo $this->after_header;
    echo $content;
    echo $this->before_footer;
    echo $template->getFooter();
    echo $this->after_footer;
    
    global $aggressive_optimize_html;
    if ( $aggressive_optimize_html )
    {
      $content = ob_get_contents();
      ob_end_clean();
      
      ob_start();
      echo aggressive_optimize_html($content);
    }
    else
    {
      $content = ob_get_contents();
      ob_end_clean();
      
      ob_start();
      echo preg_replace('~</?enano:no-opt>~', '', $content);
    }
    
  }
  
  public function set_title($title)
  {
    global $template;
    $template->assign_vars(array(
        'PAGE_NAME' => htmlspecialchars($title)
      ));
  }
}

/**
 * Same as HTML, except uses simple-header and simple-footer.
 */

class Output_HTML_Simple extends Output_HTML
{
  public function footer()
  {
    global $template;
    if ( !$this->headers_sent )
      return;
    
    $this->headers_sent = false;
    $content = ob_get_contents();
    ob_end_clean();
    
    ob_start();
    echo $this->before_header;
    echo $template->getHeader(true);
    echo $this->after_header;
    echo $content;
    echo $this->before_footer;
    echo $template->getFooter(true);
    echo $this->after_footer;
    
    global $aggressive_optimize_html;
    if ( $aggressive_optimize_html )
    {
      $content = ob_get_contents();
      ob_end_clean();
      
      ob_start();
      echo aggressive_optimize_html($content);
    }
    else
    {
      $content = ob_get_contents();
      ob_end_clean();
      
      ob_start();
      echo preg_replace('~</?enano:no-opt>~', '', $content);
    }
  }
}

/**
 * Outputter that bypasses $template->header() and $template->footer(), but still shows HTML added via {before,after}_{header,footer}.
 */

class Output_Striptease extends Output_HTML
{
  public function header()
  {
    echo $this->before_header;
    echo $this->after_header;
  }
  
  public function footer()
  {
    echo $this->before_footer;
    echo $this->after_footer;
  }
}

/**
 * Outputter that bypasses $template->header() and $template->footer().
 */

class Output_Naked extends Output_HTML
{
  public $naked = true;
  
  public function header()
  {
  }
  
  public function footer()
  {
  }
}

/**
 * Safe template outputter
 */

class Output_Safe
{
  protected $template;
  protected $headers_sent = false;
  public function __construct()
  {
    $this->template = new template_nodb();
    $theme = ( defined('ENANO_CONFIG_FETCHED') ) ? getConfig('theme_default') : 'oxygen';
    $style = ( defined('ENANO_CONFIG_FETCHED') ) ? '__foo__' : 'bleu';
    
    $this->template->load_theme($theme, $style);
    $this->template->tpl_strings['SITE_NAME'] = getConfig('site_name');
    $this->template->tpl_strings['SITE_DESC'] = getConfig('site_desc');
    $this->template->tpl_strings['COPYRIGHT'] = getConfig('copyright_notice');
    $this->template->tpl_strings['PAGE_NAME'] = 'Untitled';
  }
  public function header()
  {
    if ( $this->headers_sent )
      return;
    
    $this->headers_sent = true;
    
    $this->template->header();
  }
  
  public function footer()
  {
    global $template;
    if ( !$this->headers_sent )
    {
      $this->template->header();
    }
    
    $this->headers_sent = false;
    $this->template->footer();
    
  }
  
  public function set_title($title)
  {
    $this->template->tpl_strings['PAGE_NAME'] = $title;
  }
}

?>