<?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_Adminhtml
 * @copyright   Copyright (c) 2013 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Tax rule controller
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Tax_RuleController extends Mage_Adminhtml_Controller_Action
{
    /**
     * Index action
     *
     * @return Mage_Adminhtml_Tax_RuleController
     */
    public function indexAction()
    {
        $this->_title($this->__('Sales'))
             ->_title($this->__('Tax'))
             ->_title($this->__('Manage Tax Rules'));

        $this->_initAction()
            ->_addContent($this->getLayout()->createBlock('adminhtml/tax_rule'))
            ->renderLayout();
        return $this;
    }

    /**
     * Redirect to edit action
     */
    public function newAction()
    {
        $this->_forward('edit');
    }

    /**
     * Edit action
     */
    public function editAction()
    {
        $this->_title($this->__('Sales'))
             ->_title($this->__('Tax'))
             ->_title($this->__('Manage Tax Rules'));

        $taxRuleId  = $this->getRequest()->getParam('rule');
        $ruleModel  = Mage::getModel('tax/calculation_rule');
        if ($taxRuleId) {
            $ruleModel->load($taxRuleId);
            if (!$ruleModel->getId()) {
                Mage::getSingleton('adminhtml/session')->unsRuleData();
                Mage::getSingleton('adminhtml/session')
                    ->addError(Mage::helper('tax')->__('This rule no longer exists.'));
                $this->_redirect('*/*/');
                return;
            }
        }

        $data = Mage::getSingleton('adminhtml/session')->getRuleData(true);
        if (!empty($data)) {
            $ruleModel->setData($data);
        }

        $this->_title($ruleModel->getId() ? sprintf("%s", $ruleModel->getCode()) : $this->__('New Rule'));

        Mage::register('tax_rule', $ruleModel);

        $this->_initAction()
            ->_addBreadcrumb(
                $taxRuleId ? Mage::helper('tax')->__('Edit Rule') :  Mage::helper('tax')->__('New Rule'),
                $taxRuleId ?  Mage::helper('tax')->__('Edit Rule') :  Mage::helper('tax')->__('New Rule'))
            ->_addContent($this->getLayout()->createBlock('adminhtml/tax_rule_edit')
                ->setData('action', $this->getUrl('*/tax_rule/save')))
            ->renderLayout();
    }

    /**
     * Save action
     *
     * @return Mage_Core_Controller_Response_Http|Mage_Core_Controller_Varien_Action
     */
    public function saveAction()
    {
        $postData = $this->getRequest()->getPost();
        if (!$postData) {
            return $this->getResponse()->setRedirect($this->getUrl('*/tax_rule'));
        }

        $ruleModel = $this->_getSingletonModel('tax/calculation_rule');
        $ruleModel->setData($postData);
        $ruleModel->setCalculateSubtotal($this->getRequest()->getParam('calculate_subtotal', 0));

        try {

            //Check if the rule already exists
            if (!$this->_isValidRuleRequest($ruleModel)) {
                return $this->_redirectReferer();
            }

            $ruleModel->save();

            $this->_getSingletonModel('adminhtml/session')
                ->addSuccess($this->_getHelperModel('tax')->__('The tax rule has been saved.'));

            if ($this->getRequest()->getParam('back')) {
                return $this->_redirect('*/*/edit', array('rule' => $ruleModel->getId()));
            }

            return $this->_redirect('*/*/');
        }
        catch (Mage_Core_Exception $e) {
            $this->_getSingletonModel('adminhtml/session')->addError($e->getMessage());
        }
        catch (Exception $e) {
            $this->_getSingletonModel('adminhtml/session')
                ->addError($this->_getHelperModel('tax')->__('An error occurred while saving this tax rule.'));
        }

        $this->_getSingletonModel('adminhtml/session')->setRuleData($postData);
        $this->_redirectReferer();
    }


    /**
     * Check if this a duplicate rule creation request
     *
     * @param Mage_Tax_Model_Calculation_Rule $ruleModel
     * @return bool
     */
    protected function _isValidRuleRequest($ruleModel)
    {
        $existingRules = $ruleModel->fetchRuleCodes($ruleModel->getTaxRate(),
            $ruleModel->getTaxCustomerClass(), $ruleModel->getTaxProductClass());

        //Remove the current one from the list
        $existingRules = array_diff($existingRules, array($ruleModel->getCode()));

        //Verify if a Rule already exists. If not throw an error
        if (count($existingRules) > 0) {
            $ruleCodes = implode(",", $existingRules);
            $this->_getSingletonModel('adminhtml/session')->addError(
                $this->_getHelperModel('tax')->__('Rules (%s) already exist for the specified Tax Rate, Customer Tax Class and Product Tax Class combinations', $ruleCodes));
            return false;
        }
        return true;
    }

    /**
     * Delete action
     */
    public function deleteAction()
    {
        $ruleId = (int)$this->getRequest()->getParam('rule');
        $ruleModel = Mage::getSingleton('tax/calculation_rule')
            ->load($ruleId);
        if (!$ruleModel->getId()) {
            Mage::getSingleton('adminhtml/session')->addError(Mage::helper('tax')->__('This rule no longer exists'));
            $this->_redirect('*/*/');
            return;
        }

        try {
            $ruleModel->delete();

            Mage::getSingleton('adminhtml/session')
                ->addSuccess(Mage::helper('tax')->__('The tax rule has been deleted.'));
            $this->_redirect('*/*/');

            return;
        }
        catch (Mage_Core_Exception $e) {
            Mage::getSingleton('adminhtml/session')->addError($e->getMessage());
        }
        catch (Exception $e) {
            Mage::getSingleton('adminhtml/session')
                ->addError(Mage::helper('tax')->__('An error occurred while deleting this tax rule.'));
        }

        $this->_redirectReferer();
    }

    /**
     * Initialize action
     *
     * @return Mage_Adminhtml_Controller_Action
     */
    protected function _initAction()
    {
        $this->loadLayout()
            ->_setActiveMenu('sales/tax/rule')
            ->_addBreadcrumb(Mage::helper('tax')->__('Tax'), Mage::helper('tax')->__('Tax'))
            ->_addBreadcrumb(Mage::helper('tax')->__('Tax Rules'), Mage::helper('tax')->__('Tax Rules'))
        ;
        return $this;
    }

    /**
     * Check if sales rules is allowed
     *
     * @return bool
     */
    protected function _isAllowed()
    {
        return Mage::getSingleton('admin/session')->isAllowed('sales/tax/rules');
    }

    /**
     * Return model instance
     *
     * @param string $className
     * @param array $arguments
     * @return Mage_Core_Model_Abstract
     */
    protected function _getSingletonModel($className, $arguments = array())
    {
        return Mage::getSingleton($className, $arguments);
    }

    /**
     * Return helper instance
     *
     * @param string $className
     * @return Mage_Core_Model_Abstract
     */
    protected function _getHelperModel($className)
    {
        return Mage::helper($className);
    }
}
