<?
//načtení podpory
ob_start();
require("../config/config.php");
ob_end_clean();

//resizovací konstanty
define('MAX_SIZE',  400);   //maximální velikost náhledu
define('MIN_STEP',  1);    //rozdíl velikostí náhledů, pro něž se už generují nové náhledy
define('ERROR_IMAGE',  ROOT_DIR . '/admin/files/web_images/error.jpg');    //obrázek zobrazený při chybě


if(isset($_GET['filename'])) $file_request = addslashes($_GET['filename']); else $file_request='';

$parts = explode('.', $file_request);
$ext = $parts[count($parts)-1];
unset($parts[count($parts)-1]);

$file_name = implode('.', $parts);
$parts = explode('_', $file_name);
$size = (int)$parts[count($parts)-1];
unset($parts[count($parts)-1]);

$file_name = implode('_', $parts);

$size = ($size > MAX_SIZE) ? MAX_SIZE : $size;
$size = round($size/MIN_STEP)*MIN_STEP;

$orig = FOTOGRAFIE . $file_name . '.' . $ext; 
$thumb = NAHLEDY . $file_name . '_' . $size. '.' . $ext;
$cache = false;

if(file_exists($thumb)) //pokud už náhled této velikosti existuje
{
  $imagesize = getimagesize($thumb);
  switch ($imagesize[2])
  {
    case 2: 
      @$newimg = imagecreatefromjpeg($thumb);    
      break;
    case 3:
      @$newimg = imagecreatefrompng($thumb);     
      break;
  }
}
else
{
  if(file_exists($orig) AND $size > 0)
  {
    $imagesize = getimagesize($orig);
    switch ($imagesize[2])
    {
      case 2: 
        @$img = imagecreatefromjpeg($orig);    
        break;
      case 3:
        @$img = imagecreatefrompng($orig);     
        break;
    }
    $ratio = $imagesize[0]/$imagesize[1];
    if($ratio >= 1) //landscape
    {
      $width = $size;
      $height = $size/$ratio;
    }
    else
    {
      $height = $size;
      $width = $size*$ratio;
    }
    
    $newimg = imagecreatetruecolor($width, $height);
    imagecopyresampled($newimg,$img,0,0,0,0,$width,$height,$imagesize[0],$imagesize[1]);
    $cache = true;    
  }
  else
  {
    if($size==0) $size = 100;
    $imagesize = getimagesize(ERROR_IMAGE);
    switch ($imagesize[2])
    {
      case 2: 
        @$img = imagecreatefromjpeg(ERROR_IMAGE);    
        break;
      case 3:
        @$img = imagecreatefrompng(ERROR_IMAGE);     
        break;
    }
    $ratio = $imagesize[0]/$imagesize[1];
    if($ratio >= 1) //landscape
    {
      $width = $size;
      $height = $size/$ratio;
    }
    else
    {
      $height = $size;
      $width = $size*$ratio;
    }
    
    $newimg = imagecreatetruecolor($width, $height);
    imagecopyresampled($newimg,$img,0,0,0,0,$width,$height,$imagesize[0],$imagesize[1]);
  }  
}

header("Content-type: " . image_type_to_mime_type($imagesize[2]));
switch ($imagesize[2]) {
    case 2:
      imagejpeg($newimg,"",90);
      if($cache) imagejpeg($newimg, $thumb, 90);
    break;
    case 3:
      imagepng($newimg);
      if($cache) imagepng($newimg, $thumb);
    break;
}

imagedestroy($img);
imagedestroy($newimg);    
    

?>