public static function _installFiles($files = NULL)
    {
        if(!isset($files)) {
            /*$libs = array(
            dirname(__FILE__).'/lib/PixPlaceCsvManager.php' => _PS_CLASS_DIR_.'PixPlaceCsvManager.php',
            dirname(__FILE__).'/lib/PixPlaceLog.php' => _PS_CLASS_DIR_.'PixPlaceLog.php',
            dirname(__FILE__).'/lib/PixPlaceObj.php' => _PS_CLASS_DIR_.'PixPlaceObj.php',
            dirname(__FILE__).'/lib/PixPlaceOrder.php' => _PS_CLASS_DIR_.'PixPlaceOrder.php',
            dirname(__FILE__).'/lib/PixPlaceOrderDetail.php' => _PS_CLASS_DIR_.'PixPlaceOrderDetail.php',
            dirname(__FILE__).'/lib/PixPlaceProduct.php' => _PS_CLASS_DIR_.'PixPlaceProduct.php',
            dirname(__FILE__).'/lib/PixPlaceReport.php' => _PS_CLASS_DIR_.'PixPlaceReport.php',
            dirname(__FILE__).'/lib/PixPlaceReportStatus.php' => _PS_CLASS_DIR_.'PixPlaceReportStatus.php',
            dirname(__FILE__).'/lib/PixPlacePayment.php' => _PS_CLASS_DIR_.'PixPlacePayment.php',
            );
            $files = $libs;*/
            return true;
        }

        foreach($files as $from=>&$to) {
            if(file_exists($to))
                self::_addlog("INSTALL FILES: file '{$to}' allready exists, it will be overwrited.", 'install');

            $dir = dirname($to);
            if(!file_exists($dir)){
                self::_addlog("INSTALL FILES: directory '$dir' doesn't exists, it will be created.", 'install');

                if(!mkdir($dir,0755,true)){
                    self::_addlog("INSTALL FILES: Unable to create directory '$dir', unable to install file '".basename($to)."'.", 'install');
                    return false;
                }

                self::_addlog("INSTALL FILES: directory '$dir' created.", 'install');
            }

            if(!copy($from,$to)){
                self::_addlog("INSTALL FILES: Unable to install file from:'{$from}' to:'{$to}'", 'install');
                self::_addlog("INSTALL FILES: Give 777 permissions to '{$dir}' prestashop folder", 'install');
                if (version_compare(PHP_VERSION, '5.2.0', '>=')) {
                    $errors = error_get_last();
                    self::_addlog("COPY ERROR: {$errors['type']} - {$errors['message']}", 'install');
                }
                return false;
            }
            else{
                chmod($to, 0777);
                self::_addlog("INSTALL FILES: Installed '$to'", 'install');
            }
        }

        self::_addlog('INSTALL FILES: Successfully installed', 'install');
        return true;
    }

    public static function _uninstallFiles($files = NULL)
    {
        if(!isset($files)) {
            /*$libs = array(
            dirname(__FILE__).'/lib/PixPlaceCsvManager.php' => _PS_CLASS_DIR_.'PixPlaceCsvManager.php',
            dirname(__FILE__).'/lib/PixPlaceLog.php' => _PS_CLASS_DIR_.'PixPlaceLog.php',
            dirname(__FILE__).'/lib/PixPlaceObj.php' => _PS_CLASS_DIR_.'PixPlaceObj.php',
            dirname(__FILE__).'/lib/PixPlaceOrder.php' => _PS_CLASS_DIR_.'PixPlaceOrder.php',
            dirname(__FILE__).'/lib/PixPlaceOrderDetail.php' => _PS_CLASS_DIR_.'PixPlaceOrderDetail.php',
            dirname(__FILE__).'/lib/PixPlaceProduct.php' => _PS_CLASS_DIR_.'PixPlaceProduct.php',
            dirname(__FILE__).'/lib/PixPlaceReport.php' => _PS_CLASS_DIR_.'PixPlaceReport.php',
            dirname(__FILE__).'/lib/PixPlaceReportStatus.php' => _PS_CLASS_DIR_.'PixPlaceReportStatus.php',
            dirname(__FILE__).'/lib/PixPlacePayment.php' => _PS_CLASS_DIR_.'PixPlacePayment.php',
            );
            $files = $libs;*/
            return true;
        }

        foreach($files as &$file) {
            if(!file_exists($file)){
                self::_addlog("UNINSTALL FILES: file '$file' does not exist.",'uninstall');
            }
            elseif(!unlink($file)){
                self::_addlog("UNINSTALL FILES: unable to delete file '$file'.",'uninstall');
                return false;
            }
            else{
                self::_addlog("UNINSTALL FILES: '$file' deleted",'uninstall');
            }
        }

        self::_addlog('UNINSTALL FILES: Successfully uninstalled','uninstall');
        return true;
    }

public static function _installEmails()
    {
        $files = array();

        foreach (Language::getLanguages(false) AS $language)
        {
            if(strtolower($language['iso_code']) == 'it') {
                $files = array(
                    dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_shipped.html' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_shipped.html',
                    dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_shipped.txt' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_shipped.txt',
                    dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_invoice.html' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_invoice.html',
                    dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_invoice.txt' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_invoice.txt',
                    dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_refunded.html' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_refunded.html',
                    dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_refunded.txt' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_refunded.txt',
                );

                self::_installFiles($files);
            }
            else {
                $files = array(
                    dirname(__FILE__).'/mails/en/pixplace_shipped.html' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_shipped.html',
                    dirname(__FILE__).'/mails/en/pixplace_shipped.txt' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_shipped.txt',
                    dirname(__FILE__).'/mails/en/pixplace_invoice.html' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_invoice.html',
                    dirname(__FILE__).'/mails/en/pixplace_invoice.txt' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_invoice.txt',
                    dirname(__FILE__).'/mails/en/pixplace_refunded.html' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_refunded.html',
                    dirname(__FILE__).'/mails/en/pixplace_refunded.txt' => _PS_MAIL_DIR_.$language['iso_code'].'/pixplace_refunded.txt',
                );

                self::_installFiles($files);
            }
        }

        return true;
    }

    public static function _uninstallEmails()
    {
        foreach (Language::getLanguages() AS $language)
        {
            $files = array(
                dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_shipped.html' => _MAIL_DIR_.$language['iso_code'].'/pixplace_shipped.html',
                dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_shipped.txt' => _MAIL_DIR_.$language['iso_code'].'/pixplace_shipped.txt',
                dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_invoice.html' => _MAIL_DIR_.$language['iso_code'].'/pixplace_invoice.html',
                dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_invoice.txt' => _MAIL_DIR_.$language['iso_code'].'/pixplace_invoice.txt',
                dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_refunded.html' => _MAIL_DIR_.$language['iso_code'].'/pixplace_refunded.html',
                dirname(__FILE__).'/mails/'.$language['iso_code'].'/pixplace_refunded.txt' => _MAIL_DIR_.$language['iso_code'].'/pixplace_refunded.txt',
            );

            self::_uninstallFiles($files);
        }
        return true;
    }