text: var inventoryData = require('./data/inventory-mock');
  var warehouse = require('./warehouse');
  
  function findItem(sku) {
      var i = inventoryData.map(item => item.sku).indexOf(sku);
      if (i === -1) {
          console.log(`Item - ${sku} not found`);
          return null;
      } else {
          return inventoryData[i];
      }
  }
  
  function isInStock(sku, qty) {
      var item = findItem(sku);
      return item && item.qty >= qty;
  }
  
  function order(sku, quantity, complete) {
      complete = complete || function () {};
      if (isInStock(sku, quantity)) {
          console.log(`ordering ${quantity} of item # ${sku}`);
          warehouse.packageAndShip(sku, quantity, function (tracking) {
              console.log(`order shipped, tracking - ${tracking}`);
              complete(tracking);
          });
          return true;
      } else {
          console.log(`there are not ${quantity} of item '${sku}' in stock`);
          return false;
      }
  }
  
  module.exports.orderItem = order;