app/code/core/Mage/Tax/Model/Mysql4/Calculation.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.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Tax
 * @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)
 */

/**
 * Tax Calculation Resource Model
 *
 * @author Magento Core Team <core@magentocommerce.com>
 */
class Mage_Tax_Model_Mysql4_Calculation extends Mage_Core_Model_Mysql4_Abstract
{
    protected function _construct()
    {
        $this->_setMainTable('tax/tax_calculation');
    }

    public function deleteByRuleId($ruleId)
    {
        $conn = $this->_getWriteAdapter();
        $where = $conn->quoteInto('tax_calculation_rule_id = ?', $ruleId);
        $conn->delete($this->getMainTable(), $where);
    }

    public function getDistinct($field, $ruleId)
    {
        $select = $this->_getReadAdapter()->select();
        $select->from($this->getMainTable(), $field)->where('tax_calculation_rule_id = ?', $ruleId);
        return $this->_getReadAdapter()->fetchCol($select);
    }

    public function getRate($request)
    {
        return $this->_calculateRate($this->_getRates($request));
    }

    public function getCalculationProcess($request, $rates = null)
    {
        if (is_null($rates)) {
            $rates = $this->_getRates($request);
        }

        $result = array();
        $row = array();
        $ids = array();
        $currentRate = 0;
        $totalPercent = 0;
        for ($i=0; $i<count($rates); $i++) {
            $rate = $rates[$i];
            $value = (isset($rate['value']) ? $rate['value'] : $rate['percent'])*1;

            $oneRate = array(
                            'code'=>$rate['code'],
                            'title'=>$rate['title'],
                            'percent'=>$value,
                            'position'=>$rate['position'],
                            'priority'=>$rate['priority'],
                            );


            if (isset($rate['hidden'])) {
                $row['hidden'] = $rate['hidden'];
            }

            if (isset($rate['amount'])) {
                $row['amount'] = $rate['amount'];
            }

            if (isset($rate['base_amount'])) {
                $row['base_amount'] = $rate['base_amount'];
            }
            if (isset($rate['base_real_amount'])) {
                $row['base_real_amount'] = $rate['base_real_amount'];
            }
            $row['rates'][] = $oneRate;

            if (isset($rates[$i+1]['tax_calculation_rule_id'])) {
                $rule = $rate['tax_calculation_rule_id'];
            }
            $priority = $rate['priority'];
            $ids[] = $rate['code'];

            if (isset($rates[$i+1]['tax_calculation_rule_id'])) {
                while(isset($rates[$i+1]) && $rates[$i+1]['tax_calculation_rule_id'] == $rule) {
                    $i++;
                }
            }

            $currentRate += $value;

            if (!isset($rates[$i+1]) || $rates[$i+1]['priority'] != $priority || (isset($rates[$i+1]['process']) && $rates[$i+1]['process'] != $rate['process'])) {
                $row['percent'] = (100+$totalPercent)*($currentRate/100);
                $row['id'] = implode($ids);
                $result[] = $row;
                $row = array();
                $ids = array();

                $totalPercent += (100+$totalPercent)*($currentRate/100);
                $currentRate = 0;
            }
        }

        return $result;
    }

    protected function _getRates($request)
    {
        $storeId = Mage::app()->getStore($request->getStore())->getId();

        $select = $this->_getReadAdapter()->select();
        $select
            ->from(array('main_table'=>$this->getMainTable()))
            ->where('customer_tax_class_id = ?', $request->getCustomerClassId())
            ->where('product_tax_class_id = ?', $request->getProductClassId());

        $select->join(array('rule'=>$this->getTable('tax/tax_calculation_rule')), 'rule.tax_calculation_rule_id = main_table.tax_calculation_rule_id', array('rule.priority', 'rule.position'));
        $select->join(array('rate'=>$this->getTable('tax/tax_calculation_rate')), 'rate.tax_calculation_rate_id = main_table.tax_calculation_rate_id', array('value'=>'rate.rate', 'rate.tax_country_id', 'rate.tax_region_id', 'rate.tax_postcode', 'rate.tax_calculation_rate_id', 'rate.code'));

        $select
            ->where("rate.tax_country_id = ?", $request->getCountryId())
            ->where("rate.tax_region_id in ('*', '', ?)", $request->getRegionId())
            ->where("rate.tax_postcode in ('*', '', ?)", $request->getPostcode());

        $select->joinLeft(array('title_table'=>$this->getTable('tax/tax_calculation_rate_title')), "rate.tax_calculation_rate_id = title_table.tax_calculation_rate_id AND title_table.store_id = '{$storeId}'", array('title'=>'IFNULL(title_table.value, rate.code)'));

        $order = array('rule.priority ASC', 'rule.tax_calculation_rule_id ASC', 'rate.tax_country_id DESC', 'rate.tax_region_id DESC', 'rate.tax_postcode DESC', 'rate.rate DESC');
        $select->order($order);

        return $this->_getReadAdapter()->fetchAll($select);
    }

    protected function _calculateRate($rates)
    {
        $result = 0;
        $currentRate = 0;
        for ($i=0; $i<count($rates); $i++) {
            $rate = $rates[$i];
            $rule = $rate['tax_calculation_rule_id'];
            $value = $rate['value'];
            $priority = $rate['priority'];

            while(isset($rates[$i+1]) && $rates[$i+1]['tax_calculation_rule_id'] == $rule) {
                $i++;
            }

            $currentRate += $value;

            if (!isset($rates[$i+1]) || $rates[$i+1]['priority'] != $priority) {
                $result += (100+$result)*($currentRate/100);
                $currentRate = 0;
            }
        }

        return $result;
    }

    public function getRateIds($request)
    {
        $result = array();
        $rates = $this->_getRates($request);
        for ($i=0; $i<count($rates); $i++) {
            $rate = $rates[$i];
            $rule = $rate['tax_calculation_rule_id'];
            $result[] = $rate['tax_calculation_rate_id'];
            while(isset($rates[$i+1]) && $rates[$i+1]['tax_calculation_rule_id'] == $rule) {
                $i++;
            }
        }
        return $result;
    }

    public function getRatesByCustomerTaxClass($customerTaxClass, $productTaxClass = null)
    {
        $calcJoinConditions  = "calc_table.tax_calculation_rate_id = main_table.tax_calculation_rate_id";
        $calcJoinConditions .= " AND calc_table.customer_tax_class_id = '{$customerTaxClass}'";
        if ($productTaxClass) {
            $calcJoinConditions .= " AND calc_table.product_tax_class_id = '{$productTaxClass}'";
        }

        $selectCSP = $this->_getReadAdapter()->select();
        $selectCSP->from(array('main_table'=>$this->getTable('tax/tax_calculation_rate')), array('country'=>'tax_country_id', 'region_id'=>'tax_region_id', 'postcode'=>'tax_postcode'))
            ->joinInner(
                    array('calc_table'=>$this->getTable('tax/tax_calculation')),
                    $calcJoinConditions,
                    array('product_class'=>'calc_table.product_tax_class_id'))

            ->joinLeft(
                    array('state_table'=>$this->getTable('directory/country_region')),
                    'state_table.region_id = main_table.tax_region_id',
                    array('region_code'=>'state_table.code'))

            ->distinct(true);

        $CSP = $this->_getReadAdapter()->fetchAll($selectCSP);

        $result = array();
        foreach ($CSP as $one) {
            $request = new Varien_Object();
            $request->setCountryId($one['country'])
                ->setRegionId($one['region_id'])
                ->setPostcode($one['postcode'])
                ->setCustomerClassId($customerTaxClass)
                ->setProductClassId($one['product_class']);

            $rate = $this->getRate($request);
            if ($rate) {
                $row = array(
                            'value'         => $rate/100,
                            'country'       => $one['country'],
                            'state'         => $one['region_code'],
                            'postcode'      => $one['postcode'],
                            'product_class' => $one['product_class'],
                            );

                $result[] = $row;
            }
        }

        return $result;
    }

}

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