<?php

final class SrcImage
{
  public $rel_path;
  public $coi=null;
  private $size=null;
  
  function __construct($infos)
  {
    global $conf;

    $ext = get_extension($infos['path']);
    if (in_array($ext, $conf['picture_ext']))
    {
      $this->rel_path = $infos['path'];
    }
    elseif (!empty($infos['representative_ext']))
    {
      $pi = pathinfo($infos['path']);
      $file_wo_ext = get_filename_wo_extension($pi['basename']);
      $this->rel_path = $pi['dirname'].'/pwg_representative/'
        .$file_wo_ext.'.'.$infos['representative_ext'];
    }
    else
    {
      $this->rel_path = get_themeconf('mime_icon_dir').strtolower($ext).'.png';
    }
    
    $this->coi = @$infos['coi'];
    if (isset($infos['width']) && isset($infos['height']))
    {
      $this->size = array($infos['width'], $infos['height']);
    }
  }
  
  function get_size()
  {
    if ($this->size == null)
      not_implemented(); // get size from file
    return $this->size;
  }
}

final class DerivativeImage
{
  public $src_image;
  private $params;
  private $rel_path, $rel_url;
  
  function __construct($type, $infos)
  {
    $this->src_image = new SrcImage($infos);
    self::build($type, $src_image, $this->rel_path, $this->rel_url, $this->params);
  }
  
  static function thumb_url($infos)
  {
    $src_image = new SrcImage($infos);
    self::build(IMG_THUMB, $src_image, $rel_path, $rel_url);
    //die($rel_url);
    return get_root_url().$rel_url;
  }

  static function url($type, $infos)
  {
    $src_image = new SrcImage($infos);
    self::build($type, $src_image, $rel_path, $rel_url);
    return get_root_url().$rel_url;
  }
  
  private static function build($type, $src, &$rel_path, &$rel_url, &$params = null)
  {
    if (is_string($type))
    {
      $params = ImageStdParams::get_by_type($type);
    }
    else
    {
      $type = IMG_CUSTOM;
    }
    
    // todo check if we should not downgrade to a different type because 
    // original file is too small ...
    // we are using a mime type icon ...
    // etc...
    
    $tokens=array();
    $tokens[] = substr($type,0,2);
    
    if (!empty($src->coi))
    {
      $tokens[] = 'ci'.$src->coi;
    }
    
    if ($type==IMG_CUSTOM)
    {
      $params->add_url_tokens($tokens);
    }
    
    $loc = $src->rel_path;
    if (substr_compare($loc, '../', 0, 3)==0)
    {
      $loc = substr($loc, 3);
    }
    $loc = substr_replace($loc, '-'.implode('_', $tokens), strrpos($loc, '.'), 0 );

    $rel_path = PWG_DERIVATIVE_DIR.$loc;
    
    global $conf;
    $url_style=$conf['derivative_url_style'];
    if (!$url_style)
    {
      $mtime = @filemtime(PHPWG_ROOT_PATH.$rel_path);
      if ($mtime===false)
      {
        $url_style = 2;
      }
      else
      {
        $url_style = 1;
      }
    }
    
    if ($url_style == 2)
    {
      $rel_url = 'i';
      if ($conf['php_extension_in_urls']) $rel_url .= '.php';
      if (!$conf['question_mark_in_urls']) $rel_url.= '?';
      $rel_url .= $loc;
    }
    else
    {
      $rel_url = $rel_path;
    }
  }

  /* returns the size of the derivative image*/
  function get_size()
  {
    return $this->params->compute_final_size($this->src_image->get_size(), $this->src_image->coi);
  }
}

?>