app/code/core/Mage/Weee/Model/Tax.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * @category   Mage
 * @package    Mage_Weee
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

class Mage_Weee_Model_Tax extends Mage_Core_Model_Abstract
{
    protected $_allAttributes = null;
    protected $_productDiscounts = array();

    protected function _construct()
    {
        $this->_init('weee/tax', 'weee/tax');
    }

    public function getWeeeAmount($product, $shipping = null, $billing = null, $website = null, $calculateTax = false, $ignoreDiscount = false)
    {
        $amount = 0;
        $attributes = $this->getProductWeeeAttributes($product, $shipping, $billing, $website, $calculateTax, $ignoreDiscount);
        foreach ($attributes as $attribute) {
            $amount += $attribute->getAmount();
        }
        return $amount;
    }

    public function getWeeeAttributeCodes($forceEnabled = false)
    {
        return $this->getWeeeTaxAttributeCodes($forceEnabled);
    }

    public function getWeeeTaxAttributeCodes($forceEnabled = false)
    {
        if (!$forceEnabled && !Mage::helper('weee')->isEnabled()) {
            return array();
        }

        if (is_null($this->_allAttributes)) {
            $this->_allAttributes = Mage::getModel('eav/entity_attribute')->getAttributeCodesByFrontendType('weee');
        }
        return $this->_allAttributes;
    }

    public function getProductWeeeAttributes($product, $shipping = null, $billing = null, $website = null, $calculateTax = null, $ignoreDiscount = false)
    {
        $result = array();
        $allWeee = $this->getWeeeTaxAttributeCodes();
        if (!$allWeee) {
            return $result;
        }

        $websiteId = Mage::app()->getWebsite($website)->getId();
        $store = Mage::app()->getWebsite($website)->getDefaultGroup()->getDefaultStore();

        if ($shipping) {
            $customerTaxClass = $shipping->getQuote()->getCustomerTaxClassId();
        } else {
            $customerTaxClass = null;
        }

        $rateRequest = Mage::getModel('tax/calculation')->getRateRequest($shipping, $billing, $customerTaxClass, $store);
        $defaultRateRequest = Mage::getModel('tax/calculation')->getRateRequest(false, false, false, $store);

        $discountPercent = 0;
        if (!$ignoreDiscount && Mage::helper('weee')->isDiscounted($store)) {
            $discountPercent = $this->_getDiscountPercentForProduct($product);
        }

        $productAttributes = $product->getTypeInstance(true)->getSetAttributes($product);
        foreach ($productAttributes as $code=>$attribute) {
            if (in_array($code, $allWeee)) {
                $attributeId = $attribute->getId();

                $attributeSelect = $this->getResource()->getReadConnection()->select();
                $attributeSelect->from($this->getResource()->getTable('weee/tax'), 'value');

                $on = array();
                $on[] = "attribute_id = '{$attributeId}'";
                $on[] = "(website_id in ('{$websiteId}', 0))";

                $country = $rateRequest->getCountryId();
                $on[] = "(country = '{$country}')";

                $region = $rateRequest->getRegionId();
                $on[] = "(state in ('{$region}', '*'))";

                foreach ($on as $one) {
                    $attributeSelect->where($one);
                }
                $attributeSelect->where('entity_id = ?', $product->getId());
                $attributeSelect->limit(1);

                $order = array('state DESC', 'website_id DESC');

                $attributeSelect->order($order);
                $value = $this->getResource()->getReadConnection()->fetchOne($attributeSelect);
                if ($value) {
                    if ($discountPercent) {
                        $value = Mage::app()->getStore()->roundPrice($value-($value*$discountPercent/100));
                    }

                    $taxAmount = $amount = 0;
                    $amount = $value;

                    if ($calculateTax && Mage::helper('weee')->isTaxable($store)) {
                        $defaultPercent = Mage::getModel('tax/calculation')->getRate($defaultRateRequest->setProductClassId($product->getTaxClassId()));
                        $currentPercent = $product->getTaxPercent();

                        $taxAmount = Mage::app()->getStore()->roundPrice($value/(100+$defaultPercent)*$currentPercent);
                        $amount = $value - $taxAmount;
                    }

                    $one = new Varien_Object();
                    $one->setName(Mage::helper('catalog')->__($attribute->getFrontend()->getLabel()))
                        ->setAmount($amount)
                        ->setTaxAmount($taxAmount)
                        ->setCode($attribute->getAttributeCode());

                    $result[] = $one;
                }
            }
        }
        return $result;
    }

    protected function _getDiscountPercentForProduct($product)
    {
        $website = Mage::app()->getStore()->getWebsiteId();
        $group = Mage::getSingleton('customer/session')->getCustomerGroupId();
        $key = implode('-', array($website, $group, $product->getId()));
        if (!isset($this->_productDiscounts[$key])) {
            $this->_productDiscounts[$key] = (int) $this->getResource()->getProductDiscountPercent($product->getId(), $website, $group);
        }
        if ($value = $this->_productDiscounts[$key]) {
            return 100-min(100, max(0, $value));
        } else {
            return 0;
        }
    }

    public function updateDiscountPercents()
    {
        $this->getResource()->updateDiscountPercents();
        return $this;
    }
}

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