<?php
if(!defined('QUINTACMS') ) die('No Quinta.');

if (!defined("PAYPALEXPRESSCHECKOUTACTION.CLASS.PHP")){
define("PAYPALEXPRESSCHECKOUTACTION.CLASS.PHP",1);

/**
* Class PayPalExpressCheckoutAction - PayPal  Express Checkout payment action
*
* This class provides an implementation of the PayPal Express Checkout System including the
* two points of entry required. It can be activated either as a selected payment method on the
* checkout review page or by a click on the "Check out with PayPal" button.
*
* Express Checkout consists of 2 phases:
*   1. A request is sent to the server to set up the transaction details and a "token" is returned.
*       This token is stored in _SESSION['PayPalToken'] to be used in the second phase
*        Order status is left at pending and the customer is redirected to PayPal with the token as
*       part of the redirect URL
*   2. PayPal returns the customer to the PayPalExpressReturn page - this page must exist in
*       database and have in it the PayPalExpressReturnModule. This module will use this action
*       again, calling getExpressCheckoutDetails to complete the transaction. The function will
*       DoExpressCheckoutPayment
*
* Note that this payment action requires the existance of the return and cancel pages to which
* the customer is returned from PayPal - and that these pages must contain a content block with
* the PayPalExpressReturnModule to complete the process. Completion will consist of everything
* normally done in PaymentModule in btnPurchase_Click.
*
*@todo
*   - finish stage two, sending confirmation email on approval and completing the order
* 
*@author Erik Winn <sidewalksoftware@gmail.com>
*
*@version 0.3
*
*@package Quinta
* @subpackage Classes
*/

	class PayPalExpressCheckoutAction extends PayPalNVPAction{
		/**
		* PayPalExpressCheckoutAction Constructor
		*
		* This sets various defaults specific to the Express Checkout process
		*
		*@todo
		*   - safeguard the return URLs - send session id? or, encode account id and order id ..
		*
		* @param Order objOrder - the Order to process
		*/
		public function __construct(Order $objOrder){
			try {
				parent::__construct($objOrder);
			} catch (QCallerException $objExc) {
				$objExc->IncrementOffset();
				throw $objExc;
			}
			//the order id may be redundant - we already send INVNUM, this may go away ..
			$this->aryRequestValues['RETURNURL'] = 'http://' . Quinta::$ServerName .  __QUINTA_SUBDIRECTORY__ 
											. '/index.php/PayPalExpressReturn?orderid=' . $this->objOrder->Id;
			$this->aryRequestValues['CANCELURL'] = 'http://' . Quinta::$ServerName .  __QUINTA_SUBDIRECTORY__ 
											. '/index.php/PayPalExpressCancel?orderid=' . $this->objOrder->Id;
			
			$this->strRedirectCgiUrl = '/cgi-bin/webscr?';
						 
			$this->strTemplateUri = __QUINTA_CORE_VIEWS__ . '/PayPalExpressCheckoutAction.tpl.php';
		}
	   /**
		* The createRequest functions are handled by get/setExpressCheckoutDetails
		* as they occur before and after a customer is redirected to PayPal and are
		* therefor two separate requests. 
		*/        
		protected function createPOSTRequest(){}
		protected function createGETRequest(){}
		
		/**
		* Performs any preparation steps prior to submitting an actual payment.
		* We submit a call to the SetExpressCheckoutDetails API here and set up
		* the values for the transaction. If successful, aryResponseValues['TOKEN']
		* will contain the identifier for the transaction.
		*@return bool true on success  
		*/        
		public function PreProcess(){            
			$this->aryRequestValues['METHOD'] = 'SetExpressCheckout';
			$this->setExpressCheckoutDetails();
			return ! $this->HasErrors;
		}
		/**
		* 
		*@return bool true on success
		*/        
		public function Process(){
			return ! $this->HasErrors;
		}
		/**
		* This function simply checks the return from setExpressCheckoutDetails and then
		* redirects the user to PayPal's site to complete the payment
		* Updating order_status_history is also performed here.
		*@return bool true on success  
		*/        
		public function PostProcess(){
			$strRedirectTarget = $this->strRedirectDomainName . $this->strRedirectCgiUrl
							. 'cmd=_express-checkout&token=' . $this->objPaypalTransaction->PpToken;
			Quinta::Redirect($strRedirectTarget );
		}
		
		/**
		* Creates POST string for the first half of the PayPal transaction, setting the checkout details
		* and storing the result in strPOSTRequest. Then a query is sent to NVP API server and the PayPal
		* "token" is recieved which will be used by getExpressCheckoutDetails to validate the payment.
		*/        
		protected function setExpressCheckoutDetails(){
			$this->aryRequestValues['METHOD'] = 'SetExpressCheckout';

			//optionally send a shipping address to display ..
			if( $this->ShowShippingAddress )
				$this->initShippingDetails();
			else
				$this->aryRequestValues['NOSHIPPING'] = 1;

			$this->aryRequestValues['AMT'] = $this->fltTotalPrice;
			$this->aryRequestValues['ITEMAMT'] = $this->objOrder->ProductTotalCharged;
			$this->aryRequestValues['INVNUM'] = $this->objOrder->Id;
			$this->aryRequestValues['SHIPPINGAMT'] = $this->objOrder->ShippingCharged;
			$this->aryRequestValues['HANDLINGAMT'] = $this->objOrder->HandlingCharged;
			$this->aryRequestValues['TAXAMT'] = $this->objOrder->Tax;
			//truncated to fit PP specs in case of long store names ..
			$this->aryRequestValues['DESC'] = urlencode(substr(STORE_NAME . ' Order ' . $this->objOrder->Id, 0, 127));
			
			foreach( $this->aryRequestValues as $strName => $strValue )
				if('' != $strValue )
					$this->strPOSTRequest .= '&' . $strName . '=' . $strValue;
			$this->submitRequest();
			
			$this->handleResponse();
/*            if( ! $this->submitRequest())
				throw new Exception('PayPal EC submit failed: ' . $this->strPOSTRequest);
			
			if( ! $this->handleResponse())
				throw new Exception('PayPal EC submit failed: ' . $this->strErrors
												 . ' <br /><br /> Response: ' . $this->strResponse);*/
		}
		/**
		* This function is called by PayPalExpressReturnModule when the buyer returns from PayPal.
		*Here we determine the payer id and status in preparation for completing the order ..
		*/
		public function getExpressCheckoutDetails(){
			$this->strPOSTRequest = '';
			$this->aryRequestValues['METHOD'] = 'GetExpressCheckoutDetails';
			$this->aryRequestValues['TOKEN'] = $_GET['token'];
			// also adds default settings ..
			foreach( $this->aryRequestValues as $strName => $strValue )
				if('' != $strValue )
					$this->strPOSTRequest .= '&' . $strName . '=' . $strValue;

			$this->submitRequest();
			$this->handleResponse();
			if( $this->HasErrors )
				return false;
			if( '' == $this->objPaypalTransaction->PayerId ){
				$this->HasErrors = true;
				$this->objPaypalTransaction->Messages .= '| Quinta PP Express: No PayerId returned! |';
				$this->objPaypalTransaction->Save();
				return false;
			}
			return true;
		}
		/**
		* This function overrides the PaymentActionBase completion - it is called by PayPalExpressReturnModule
		* when the buyer returns from PayPal.
		*@todo handle PENDINGREASON, REASONCODE, PAYMENTTYPE != INSTANT ..
		*/
		public function doExpressCheckoutPayment(){
			$this->strPOSTRequest = '';
			$this->aryRequestValues['METHOD'] = 'DoExpressCheckoutPayment';
			$this->aryRequestValues['TOKEN'] = $this->objPaypalTransaction->PpToken;
			$this->aryRequestValues['PAYERID'] = $this->objPaypalTransaction->PayerId;
			$this->aryRequestValues['INVNUM'] = $this->objOrder->Id;
			$this->aryRequestValues['AMT'] = $this->fltTotalPrice;
			$this->aryRequestValues['ITEMAMT'] = $this->objOrder->ProductTotalCharged;
			$this->aryRequestValues['SHIPPINGAMT'] = $this->objOrder->ShippingCharged;
			$this->aryRequestValues['HANDLINGAMT'] = $this->objOrder->HandlingCharged;
			$this->aryRequestValues['TAXAMT'] = $this->objOrder->Tax;
			// also adds default settings ..
			foreach( $this->aryRequestValues as $strName => $strValue )
				if('' != $strValue )
					$this->strPOSTRequest .= '&' . $strName . '=' . $strValue;			
			$this->submitRequest();
			$this->handleResponse();
			if( $this->HasErrors )
				return false;
				
			// check for the payment status
			$strStatus = $this->objPaypalTransaction->PaymentStatus;
			if('' == $strStatus ){
				$this->HasErrors = true;
				$this->objPaypalTransaction->Messages .= '| Quinta PP Express: No Payment status returned! |';
				$this->objPaypalTransaction->Save();
				return false;
			}

///@todo handle PENDINGREASON, REASONCODE, PAYMENTTYPE != INSTANT ..
			switch( strtoupper($strStatus) ){
				case 'COMPLETED':
					$this->blnApproved = true;
					break;
				case 'PENDING':
				default:
					$this->blnApproved = false;                    
			}
		}
		
		protected function initShippingDetails(){
			$this->aryRequestValues['NOSHIPPING'] = 0;
			$this->aryRequestValues['ADDRESSOVERRIDE'] = 1;
			
			//We must concatenate all the name fields into NAME ..
			if( '' != $this->objOrder->ShippingNamePrefix )
				$this->aryRequestValues['SHIPTONAME'] = urlencode($this->objOrder->ShippingNamePrefix . ' ');
			$this->aryRequestValues['SHIPTONAME'] .= urlencode($this->objOrder->ShippingFirstName);

			if( '' != $this->objOrder->ShippingMiddleName )
				$this->aryRequestValues['SHIPTONAME'] .= urlencode(' ' . $this->objOrder->ShippingMiddleName);
			$this->aryRequestValues['SHIPTONAME'] .= urlencode(' ' . $this->objOrder->ShippingLastName);

			if( '' != $this->objOrder->ShippingNameSuffix )
				$this->aryRequestValues['SHIPTONAME'] .= urlencode(' ' . $this->objOrder->ShippingNameSuffix);

			$this->aryRequestValues['SHIPTOSTREET'] = urlencode($this->objOrder->ShippingStreet1);

			if( '' != $this->objOrder->ShippingStreet2 )
				$this->aryRequestValues['SHIPTOSTREET2'] = urlencode($this->objOrder->ShippingStreet2);
			//PayPal offers no field for County or Suburb so we must put them in street2 ..
			if( '' != $this->objOrder->ShippingSuburb )
				$this->aryRequestValues['SHIPTOSTREET2'] .= urlencode(', ' . $this->objOrder->ShippingSuburb);
			if( '' != $this->objOrder->ShippingCounty )
				$this->aryRequestValues['SHIPTOSTREET2'] .= urlencode(', ' . $this->objOrder->ShippingCounty);

			$this->aryRequestValues['SHIPTOCITY'] = urlencode($this->objOrder->ShippingCity);
			$this->aryRequestValues['SHIPTOSTATE'] = urlencode($this->objOrder->ShippingState);
			$this->aryRequestValues['SHIPTOCOUNTRY'] = urlencode($this->objOrder->ShippingCountry);
			$this->aryRequestValues['SHIPTOZIP'] = urlencode($this->objOrder->ShippingPostalCode);
		}
		/**
		* Creates GET query string for the second half of the PayPal transaction. This function is called
		* by the PayPalExpressReturnModule only, which is effectively the return URL given to PayPal
		* in the first half of the transaction to which the user is redirected after paying. The "token"
		*/
		
		public function __get($strName){
			switch ($strName){
				case 'ShowShippingAddress':
					return $this->blnShowShippingAddress;
				default:
					 try {
						return parent::__get($strName);
					 } catch (QCallerException $objExc) {
						$objExc->IncrementOffset();
						throw $objExc;
					 }
			}
		}
		
		public function __set($strName, $mixValue){
			switch ($strName){
				case 'ShowShippingAddress':
					try {
						$this->blnShowShippingAddress = QType::Cast($mixValue, QType::Boolean );
					} catch (QInvalidCastException $objExc) {
						$objExc->IncrementOffset();
						throw $objExc;
					}
					//careful, its backwards ..
					$this->aryRequestValues['NOSHIPPING'] = (true === $mixValue) ? 0 : 1;
				default:
					try {
						return (parent::__set($strName, $mixValue));
					} catch (QCallerException $objExc) {
						$objExc->IncrementOffset();
						throw $objExc;
					}
			}
		}
	
	}//end class
}//end define

?>