<?php

  $batch_filename = '/ad/tshirts/orders/current-batch/batch.xml';


  // Load the batch data
  $batch_xml = simplexml_load_file($batch_filename);


  // Create array mapping customer_id to an array of orders
  $customer_order_array = array();
  foreach($batch_xml->order as $order)
  {
    $customer_id = (string) $order->customer_id;
    $customer_order_array[$customer_id][] = $order;
  }


  // Create array mapping order_id to an array of cancellations, payments, and pickups
  $order_status_array = array();
  foreach($batch_xml->order_cancel as $order_cancel)
  {
    $order_id = (string) $order_cancel->order_id;
    $order_status_array[$order_id]['cancellations'][] = $order_cancel;
  }
  foreach($batch_xml->payment as $payment)
  {
    $order_id = (string) $payment->order_id;
    $order_status_array[$order_id]['payments'][] = $payment;
  }
  foreach($batch_xml->pickup as $pickup)
  {
    $order_id = (string) $pickup->order_id;
    $order_status_array[$order_id]['pickups'][] = $pickup;
  }


  // Is this order cancelled?
  function is_order_cancelled($order_id)
  {
    global $order_status_array;
    $cancellations = $order_status_array[$order_id]['cancellations'];
    if(empty($cancellations))
    {
      return false;
    }
    elseif(count($cancellations) > 1)
    {
      exit("Error: order " . $order_id . " has more than one cancellation.");
    }
    else
    {
      return current($cancellations);
    }
  }


  // Is this order paid for?
  function is_order_paid_for($order_id)
  {
    global $order_status_array;
    $payments = $order_status_array[$order_id]['payments'];
    if(empty($payments))
    {
      return false;
    }
    elseif(count($payments) > 1)
    {
      exit("Error: order " . $order_id . " has more than one payment.");
    }
    else
    {
      return current($payments);
    }
  }


  // Is this order picked up?
  function is_order_picked_up($order_id)
  {
    global $order_status_array;
    $pickups = $order_status_array[$order_id]['pickups'];
    if(empty($pickups))
    {
      return false;
    }
    elseif(count($pickups) > 1)
    {
      exit("Error: order " . $order_id . " has more than one pickup.");
    }
    else
    {
      return current($pickups);
    }
  }


  // Get unique id from object
  function get_guid($object)
  {
    $attribute = 'guid';
    $guid = (string) $object->attributes()->$attribute;
    return $guid;
  }


  // Get object from unique id
  function get_object($guid)
  {
    global $batch_xml;
    foreach($batch_xml->children() as $object)
    {
      if($guid == get_guid($object))
      {
        return $object;
      }
    }
  }


  // How many customers are there right now?
  function number_of_customers()
  {
    global $batch_xml;
    return count($batch_xml->xpath('/batch/customer'));
  }


  // How many shirts have been ordered so far?
  function number_of_shirts()
  {
    global $batch_xml;
    $result = 0;
    foreach($batch_xml->order as $order_xml)
    {
      if(!is_order_cancelled(get_guid($order_xml)))
      {
        $result += count($order_xml->xpath('shirts/shirt'));
      }
    }
    return $result;
  }


?>