File Manager

<?php
/*
* 2007-2014 PrestaShop
*
* 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@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2014 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

/**
 * @since 1.5.0.1
 */
class TaxRulesTaxManagerCore implements TaxManagerInterface
{
	public $address;
	public $type;
	public $tax_calculator;

	/**
	 * 
	 * @param Address $address
	 * @param mixed An additional parameter for the tax manager (ex: tax rules id for TaxRuleTaxManager)
	 */
	public function __construct(Address $address, $type)
	{
		$this->address = $address;
		$this->type = $type;
	}

	/**
	* Returns true if this tax manager is available for this address
	*
	* @return boolean
	*/
	public static function isAvailableForThisAddress(Address $address)
	{
		return true; // default manager, available for all addresses
	}

	/**
	* Return the tax calculator associated to this address
	*
	* @return TaxCalculator
	*/
	public function getTaxCalculator()
	{
		static $tax_enabled = null;

		if (isset($this->tax_calculator))
			return $this->tax_calculator;

		if ($tax_enabled === null)
			$tax_enabled = Configuration::get('PS_TAX');
		
		if (!$tax_enabled)
			return new TaxCalculator(array());
	
		$taxes = array();
		$postcode = 0;
		if (!empty($this->address->postcode))
			$postcode = $this->address->postcode;

		$cache_id = (int)$this->address->id_country.'-'.(int)$this->address->id_state.'-'.$postcode.'-'.(int)$this->type;
		if (!Cache::isStored($cache_id))
		{
			$rows = Db::getInstance()->executeS('
			SELECT *
			FROM `'._DB_PREFIX_.'tax_rule`
			WHERE `id_country` = '.(int)$this->address->id_country.'
			AND `id_tax_rules_group` = '.(int)$this->type.'
			AND `id_state` IN (0, '.(int)$this->address->id_state.')
			AND (\''.pSQL($postcode).'\' BETWEEN `zipcode_from` AND `zipcode_to` OR (`zipcode_to` = 0 AND `zipcode_from` IN(0, \''.pSQL($postcode).'\')))
			ORDER BY `zipcode_from` DESC, `zipcode_to` DESC, `id_state` DESC, `id_country` DESC');

			$behavior = 0;
			$first_row = true;

			foreach ($rows as $row)
			{
				$tax = new Tax((int)$row['id_tax']);

				$taxes[] = $tax;

				// the applied behavior correspond to the most specific rules
				if ($first_row)
				{
					$behavior = $row['behavior'];
					$first_row = false;
				}

				if ($row['behavior'] == 0)
					 break;
			}
			Cache::store($cache_id, new TaxCalculator($taxes, $behavior));
		}
		return Cache::retrieve($cache_id);
	}
}