<?php
class Orange35_Accumulativepromo_Model_Observer
{
    public function onSaveOrder(Varien_Event_Observer $observer)
    {
        $order = $observer->getData('order');
        if($order->getStatus() == "complete"){
            $customerId = $order->getCustomerId();
            $rules = Mage::getModel('salesrule/rule')->getCollection();
            foreach($rules as $rule){
                if($rule->getSimpleAction() == Orange35_Accumulativepromo_Model_SalesRule_Rule::ACCUMULATIVE_ACTION){
                    $date = Mage::getSingleton('core/date');
                    $orderstotalperiodModel = Mage::getModel('orange35_accumulativepromo/orderstotalperiod');
                    $accumulativeModel = Mage::getModel('orange35_accumulativepromo/accumulativepromo');
                    $accumulativeModel->load($rule->getId());
                    $to = $date->gmtDate("Y-m-d H:i:s", Mage::app()->getLocale()->date()->toString(Varien_Date::DATETIME_INTERNAL_FORMAT));
                    $from = $date->gmtDate("Y-m-d H:i:s", date('Y-m-d H:i:s', strtotime("-" . $accumulativeModel->getData("orders_period") . " month", Mage::getModel('core/date')->timestamp(time()))));
                    $orderstotalperiodCollection = Mage::getModel('orange35_accumulativepromo/orderstotalperiod')->getCollection()
                        ->addFieldToFilter('customer_id', array('eq' => array($customerId)))
                        ->addFieldToFilter('period', array('eq' => array($accumulativeModel->getData("orders_period"))));
                    $orderstotalperiodItem = $orderstotalperiodCollection->fetchItem();
                    $orderCollection = Mage::getModel('sales/order')->getCollection()
                        ->addFieldToFilter('customer_id', array('eq' => array($customerId)))
                        ->addAttributeToFilter('created_at', array('from' => $from, 'to' => $to))
                        ->addFieldToFilter('status', array("in" => array('complete')));
                    $orders_total = 0;
                    foreach ($orderCollection AS $order_row) {
                        $orders_total += $order_row->getData("base_grand_total");
                    }
                    if ($orderstotalperiodItem) {
                        $items = array(
                            'id' => $orderstotalperiodItem->getId(),
                            'customer_id' => $customerId,
                            'period' => $accumulativeModel->getData("orders_period"),
                            'orders_total' => $orders_total,
                            'date_modified' => $date->gmtDate(),
                        );
                    } else {
                        $items = array(
                            'customer_id' => $customerId,
                            'period' => $accumulativeModel->getData("orders_period"),
                            'orders_total' => $orders_total,
                            'date_modified' => $date->gmtDate(),
                        );
                    }
                    $orderstotalperiodModel->addData($items);
                    $orderstotalperiodModel->save();
                }
            }
        }
        return $this;
    }
}