FlowAndWebServices

// initialize some global varibles
var partnerId = 443;

// load a webservice given the uri of the wsdl file
var bookshop = loadWebService('http://books.biz/ws/orderservice?WSDL');
var parcelService = loadWebService('http://shipping.com/ws/parcelservice?WSDL');

// define the prototype for a book object
Book.prototype.isbn
Book.prototype.price

function placeOrder(){

  var userId = cocoon.session['userId'];
  var book = new Book();
  var quantity = 0;
  
  while(true){
    
    // populate the book object
    book.isbn = cocoon.request['isbn'];
    quantity = cocoon.request['quantity'];    

    // check to see if the book is in stock
    var stockCheck = bookshop.checkStock(book.isbn,quantity);

    // update the books price
    book.price = stockCheck.pricePerItem;

    // if there are enough books in stock break this loop
    if(stockCheck.number >= quantity) break;

    // if there are no copies available
    if(stockCheck.number == 0){
      // send a page saying sorry
      cocoon.sendPage('view/sorry.jx',
        {message:'Sorry, but the book is sold out'});
      // exit this order
      return;
    }

    // otherwise, tell the user they must modify the order
    var message = 'Sorry we do not have enough copies. '
      + 'We only have ' + stockCheck.number + ' in stock. '
      + 'Please modify your order. ';

    cocoon.sendPageAndWait('view/editOrder.jx', 
      {book:book, message:message);

  }

  cocoon.sendPageAndWait('view/deliveryAddress.jx');
  
  var deliveryAddress = cocoon.request['address'];

  // use the parcel service to calc the shipping costs
  var shippingInfo = parcelService.calculateShippingCost(
    {class:1, type:'book', quantity:quantity, address: deliveryAddress}); 

  var totalCost = quantity * book.price;

  if(totalCost < 50){
    // for orders under £50 add post and packaging
    totalCost += shippingInfo.cost;
    totalCost += quantity * 0.5; 
  }

  // ask the user to confirm the order
  cocoon.sendPageAndWait('view/confirm.jx',
    {book:book,total:totalCost});

  // go ahead and place the order
  var order = bookshop.placeOrder(partnerId,userId,
    {order:{isbn:book.isbn, quantity:quantity}},shippingInfo.trackingId);

  // now send a success page
  cocoon.sendPage('view/done.jx',
    {order:order,tracking:shippingInfo.trackingId});

}