Apply a discount and free shipping with a coupon

<?php
/**
 * @package    HikaShop for Joomla!
 * @version    1.5.4
 * @author    hikashop.com
 * @copyright  (C) 2010-2011 HIKARI SOFTWARE. All rights reserved.
 * @license    GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */
defined('_JEXEC') or die('Restricted access');
?>
<?php if(!empty($this->rates)){ ?>
<div class="hikashop_shipping_methods" id="hikashop_shipping_methods">
  <fieldset>
    <legend class="legend"><?php echo JText::_('HIKASHOP_SHIPPING_METHOD');?></legend>
    <table>
      <?php
      $this->setLayout('listing_price');
      $this->params->set('show_quantity_field', 0);
      $auto_select_default = $this->config->get('auto_select_default',2);
      if($auto_select_default==1 && count($this->rates)>1) $auto_select_default=0;
      $done=false;
      $k = 0;
      foreach($this->rates as $rate){
      


        $checked = '';
     
        if(($this->shipping_method==$rate->shipping_type && $this->shipping_id==$rate->shipping_id)|| ($auto_select_default && empty($this->shipping_id)&&!$done)){
          $done = true;
          $checked = 'checked="checked"';
        }
        if($this->config->get('auto_submit_methods',1) && empty($checked)){
          $checked.=' onclick="this.form.submit(); return false;"';
        }
      ?>
      <tr class="<?php echo "row$k"; ?>">
        <td>
          <input class="hikashop_checkout_shipping_radio" type="radio" name="hikashop_shipping" id="radio_<?php echo $rate->shipping_type.'_'.$rate->shipping_id;?>" value="<?php echo $rate->shipping_type.'_'.$rate->shipping_id;?>" <?php echo $checked; ?> />
        </td>
        <td><label for="radio_<?php echo $rate->shipping_type.'_'.$rate->shipping_id;?>" style="cursor:pointer;">
          <span class="hikashop_checkout_shipping_image">
          <?php
            if(!empty($rate->shipping_images)){
              $images = explode(',',$rate->shipping_images);
              if(!empty($images)){
                foreach($images as $image){
                  if(!empty($this->images_shipping[$image])){
                    ?>
                    <img src="<?php echo HIKASHOP_IMAGES .'shipping/'.  $this->images_shipping[$image];?>" alt=""/>
                    <?php
                  }
                }
              }
            }
          ?>
          </span>
          </label>
        </td>
        <td><label for="radio_<?php echo $rate->shipping_type.'_'.$rate->shipping_id;?>" style="cursor:pointer;">
          <span class="hikashop_checkout_shipping_name"><?php echo $rate->shipping_name;?></span>
          <span class="hikashop_checkout_shipping_price_full">
            <?php
            if(empty($rate->shipping_price_with_tax)){
              $rate->shipping_price_with_tax = $rate->shipping_price;
            }
            if(empty($rate->shipping_price)){
              $rate->shipping_price = $rate->shipping_price_with_tax;
            }
            $taxes = round($rate->shipping_price_with_tax-$rate->shipping_price,$this->currencyHelper->getRounding($rate->shipping_currency_id));
            $prices_taxes = 1;
            if(bccomp($taxes,0,5)==0){
              $prices_taxes = 0;
            }
            if(bccomp($rate->shipping_price,0,5)===0){
              echo JText::_('FREE_SHIPPING');
            }else{
              echo JText::_('PRICE_BEGINNING');
              echo '<span class="hikashop_checkout_shipping_price">';
              if($prices_taxes){
                echo $this->currencyHelper->format($rate->shipping_price_with_tax,$rate->shipping_currency_id);
                echo JText::_('PRICE_BEFORE_TAX');
                echo $this->currencyHelper->format($rate->shipping_price,$rate->shipping_currency_id);
                echo JText::_('PRICE_AFTER_TAX');
              }else{
                echo $this->currencyHelper->format($rate->shipping_price,$rate->shipping_currency_id);
              }
              if($this->params->get('show_original_price') && isset($rate->shipping_price_orig) && bccomp($rate->shipping_price_orig,0,5)){
                echo JText::_('PRICE_BEFORE_ORIG');
                if($prices_taxes){
                  echo $this->currencyHelper->format($rate->shipping_price_orig_with_tax,$rate->shipping_currency_id_orig);
                }else{
                  echo $this->currencyHelper->format($rate->shipping_price_orig,$rate->shipping_currency_id_orig);
                }
                echo JText::_('PRICE_AFTER_ORIG');
              }
              echo '</span> ';
              echo JText::_('PRICE_END');
            }
            ?>
          </span>
          </label>
          <br/>
          <div class="hikashop_checkout_shipping_description"><?php echo $rate->shipping_description;?></div>
        </td>
      </tr>
      <?php $k = 1-$k;
      } ?>
    </table>
  </fieldset>
</div>
<?php } ?>