class AmpPdfFileTypeInspector extends FileTypeInspector {
 
    public function inspect($fv) {
        $page = 1; //not sure if it'll be possible to do multiple page PDFs in this way
 
        $path = $fv->getPath();
        $page = $page - 1;
 
      if (@is_executable("/usr/local/bin/identify")) {
         $bin = '/usr/local/bin';
      } else {
         $bin = '/usr/bin';
      }
 
        if (! @is_executable("$bin/identify") || ! @is_executable("$bin/convert") || ! @is_executable("$bin/gs")) {
            throw new Exception("PDF Inspector->inspect(): identify and convert are necessary");
        }
 
        putenv("PATH=$bin:" . getenv('PATH'));
 
        //get PDF info
        $traits = array();
        exec("$bin/identify -verbose $path 2>&1", $traits);
        $foundGeo = $foundSize = false;
 
        $dimension_pattern = '/(\d*\.?\d*)x(\d*\.?\d*)/';
        $matches = array();
 
        foreach ($traits as $trait) {
            $trait = trim($trait);
            if (strpos($trait, 'Geometry:') !== FALSE) {
                if (preg_match($dimension_pattern, $trait, $matches)) {
                    $fv->setAttribute('width', $matches[1]);
                    $fv->setAttribute('height', $matches[2]);
               $foundGeo = true;
                } else {
                    throw new Exception("PDF Inspector->inspect(): identify provided Geometry but not expected pattern");
                }
            } elseif (strpos($trait, 'Print size:') !== FALSE) {
                if (preg_match($dimension_pattern, $trait, $matches)) {
                    $fv->setAttribute('width_inches', round($matches[1], 3));
                    $fv->setAttribute('height_inches', round($matches[2], 3));
               $foundSize = true;
                } else {
                    throw new Exception("PDF Inspector->inspect(): identify provided Print Size but not expected pattern");
                }
            }
        }
 
      if (! $foundGeo || ! $foundSize) {
         throw new Exception('PDF Inspector->inspect(): identify did not provide Print Size and Geometry');
      }
 
        $fh = Loader::helper('file', 'amplify_lmt'); /* @var $fh AmplifyLmtFileHelper */
        $filename = $fh->getPDFImagePath($fv);
 
        // create full size image there
      // limit is due to dreamhost killing processes
        // colorspace specifies we want to do this in RGB. background and flatten provide a white background (oftentimes clear, which renders OK as PDF but not as jpg)
        // strip removes extraneous data. quality specifies jpg quality. density renders at 3.5x (3.5x72) and thumbnail brings it down to 100%
        // one of the key problems with image quality is the resizing back to "normal" size. even allowing the thumbnail to be 150% of size (density 108, thumbnail 100%) makes it much better
        $cmd = "$bin/convert -limit memory 64MiB -colorspace RGB -background white -flatten -strip -quality 50 -density 252 -thumbnail 28.571% {$path}[$page] $filename";
      exec($cmd);
 
        //create the smaller thumbnails (primarily for use in file browser)
        $ih = Loader::helper('image');
 
        // Use image helper to create thumbnail at the right size
        $fv->createThumbnailDirectories();
        $ih->create($filename, $fv->getThumbnailPath(1), AL_THUMBNAIL_WIDTH, AL_THUMBNAIL_HEIGHT);
        $ih->create($filename, $fv->getThumbnailPath(2), AL_THUMBNAIL_WIDTH_LEVEL2, AL_THUMBNAIL_HEIGHT_LEVEL2);
 
    }
}