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class Kcache extends KimageUtils {
    
    private $file;
    
    public $uploadDir = 'upload';
    
    public $test = '';
    
    public function __construct($source, $x, $y) {
        $image = imagecreatetruecolor($x, $y);
        $this->transparent($image);
        imagecopyresampled($image, $source, 0, 0, 0, 0, $x, $y, $x, $y);
        
        $tmpfile = tempnam($this->uploadDir . '/tmp', 'bb_');
        imagepng($image, $tmpfile, 9, PNG_ALL_FILTERS);
        $md5 = md5_file($tmpfile);
        if (!file_exists($this->uploadDir . '/' . $md5 . '.png')) {
            file_put_contents($this->uploadDir . '/' . $md5 . '.png', file_get_contents($tmpfile));    
        } // тут обработка дубля
        unlink($tmpfile);
        
        $this->file = $this->uploadDir . '/' . $md5 . '.png';
    }
    
    public function getFile() {
        return $this->file;
    }
    
    public function base64() {
        return $this->output_base64(file_get_contents($this->getFile()));
    }
    
    public function clearCache($per) {
        $periods = array(
            'i' => 60,
            'h' => 3600, // i*60
            'd' => 86400, // h*24
            'w' => 604800, // d*7
            'm' => 2419200, // w*30
            'y' => 29030400, // m*12
        );
        
        $per = strtolower($per);
        
        $int = abs(intval($per[0]));
        $int = $int > 0 ? $int : 1;
        $lit = array_key_exists($per[1], $periods) ? $per[1] : 'y';
        
        $period = time() - ($int * $periods[$lit]);
        
        foreach(new DirectoryIterator($this->uploadDir . '/') as $fileInfo) { // TODO: GlobItertor
                if (preg_match('/^(.*.png)$/i', $fileInfo->getFilename()) && ($fileInfo->getMTime() < $period)) {
                    unlink($this->uploadDir . '/' . $fileInfo->getFilename());
                }
        }            
        
    }
}