<?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_Sales
 * @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_Sales_Model_Order_Invoice_Item extends Mage_Core_Model_Abstract
{
    protected $_invoice = null;
    protected $_orderItem = null;

    /**
     * Initialize resource model
     */
    function _construct()
    {
        $this->_init('sales/order_invoice_item');
    }

    /**
     * Declare invoice instance
     *
     * @param   Mage_Sales_Model_Order_Invoice $invoice
     * @return  Mage_Sales_Model_Order_Invoice_Item
     */
    public function setInvoice(Mage_Sales_Model_Order_Invoice $invoice)
    {
        $this->_invoice = $invoice;
        return $this;
    }

    /**
     * Retrieve invoice instance
     *
     * @return Mage_Sales_Model_Order_Invoice
     */
    public function getInvoice()
    {
        return $this->_invoice;
    }

    /**
     * Declare order item instance
     *
     * @param   Mage_Sales_Model_Order_Item $item
     * @return  Mage_Sales_Model_Order_Invoice_Item
     */
    public function setOrderItem(Mage_Sales_Model_Order_Item $item)
    {
        $this->_orderItem = $item;
        $this->setOrderItemId($item->getId());
        return $this;
    }

    /**
     * Retrieve order item instance
     *
     * @return Mage_Sales_Model_Order_Item
     */
    public function getOrderItem()
    {
        if (is_null($this->_orderItem)) {
            if ($this->getInvoice()) {
                $this->_orderItem = $this->getInvoice()->getOrder()->getItemById($this->getOrderItemId());
            }
            else {
                $this->_orderItem = Mage::getModel('sales/order_item')
                    ->load($this->getOrderItemId());
            }
        }
        return $this->_orderItem;
    }

    /**
     * Declare qty
     *
     * @param   float $qty
     * @return  Mage_Sales_Model_Order_Invoice_Item
     */
    public function setQty($qty)
    {
        if ($this->getOrderItem()->getIsQtyDecimal()) {
            $qty = (float) $qty;
        }
        else {
            $qty = (int) $qty;
        }
        $qty = $qty > 0 ? $qty : 0;
        /**
         * Check qty availability
         */

        if ($qty <= $this->getOrderItem()->getQtyToInvoice() || $this->getOrderItem()->isDummy()) {
            $this->setData('qty', $qty);
        }
        else {
            Mage::throwException(
                Mage::helper('sales')->__('Invalid qty to invoice item "%s"', $this->getName())
            );
        }
        return $this;
    }

    /**
     * Applying qty to order item
     *
     * @return Mage_Sales_Model_Order_Invoice_Item
     */
    public function register()
    {
        $orderItem = $this->getOrderItem();
        $orderItem->setQtyInvoiced($orderItem->getQtyInvoiced()+$this->getQty());

        $orderItem->setTaxInvoiced($orderItem->getTaxInvoiced()+$this->getTaxAmount());
        $orderItem->setBaseTaxInvoiced($orderItem->getBaseTaxInvoiced()+$this->getBaseTaxAmount());

        $orderItem->setDiscountInvoiced($orderItem->getDiscountInvoiced()+$this->getDiscountAmount());
        $orderItem->setBaseDiscountInvoiced($orderItem->getBaseDiscountInvoiced()+$this->getBaseDiscountAmount());

        $orderItem->setRowInvoiced($orderItem->getRowInvoiced()+$this->getRowTotal());
        $orderItem->setBaseRowInvoiced($orderItem->getBaseRowInvoiced()+$this->getBaseRowTotal());
        return $this;
    }

    /**
     * Cancelling invoice item
     *
     * @return Mage_Sales_Model_Order_Invoice_Item
     */
    public function cancel()
    {
        $orderItem = $this->getOrderItem();
        $orderItem->setQtyInvoiced($orderItem->getQtyInvoiced()-$this->getQty());

        $orderItem->setTaxInvoiced($orderItem->getTaxInvoiced()-$this->getTaxAmount());
        $orderItem->setBaseTaxInvoiced($orderItem->getBaseTaxInvoiced()-$this->getBaseTaxAmount());

        $orderItem->setDiscountInvoiced($orderItem->getDiscountInvoiced()-$this->getDiscountAmount());
        $orderItem->setBaseDiscountInvoiced($orderItem->getBaseDiscountInvoiced()-$this->getBaseDiscountAmount());

        $orderItem->setRowInvoiced($orderItem->getRowInvoiced()-$this->getRowTotal());
        $orderItem->setBaseRowInvoiced($orderItem->getBaseRowInvoiced()-$this->getBaseRowTotal());
        return $this;
    }

    /**
     * Invoice item row total calculation
     *
     * @return Mage_Sales_Model_Order_Invoice_Item
     */
    public function calcRowTotal()
    {
        $rowTotal       = $this->getOrderItem()->getRowTotal()/$this->getOrderItem()->getQtyOrdered()*$this->getQty();
        $baseRowTotal   = $this->getOrderItem()->getBaseRowTotal()/$this->getOrderItem()->getQtyOrdered()*$this->getQty();
        
        $this->setRowTotal($this->getInvoice()->getStore()->roundPrice($rowTotal));
        $this->setBaseRowTotal($this->getInvoice()->getStore()->roundPrice($baseRowTotal));
        return $this;
    }

    /**
     * Checking if the item is last
     *
     * @return bool
     */
    public function isLast()
    {
        if ($this->getQty() == $this->getOrderItem()->getQtyToInvoice()) {
            return true;
        }
        return false;
    }
}