gistfile1.txt

// main function

customers = readFile('customer.dat');
prefCustomers = readFile('preffrred.dat')
orders = readFile('orders.dat')

for (order in orders){
  customer = order.getCustomer();
  subtotal = order.calcuateTotal();
  currentAmountSpent = customer.getAmountSpent;
  discount = getEligibleDiscount(customer);
  currentAmountSpent += subtotal * (1 - discount);
  updatePreferedStatus(customer, currentAmountSpent)
}

writeToFile(customers, 'customer.dat');
writeToFile(prefCustomers, 'preffrred.dat');


// support functions

// this will read the given filename and split the text for new line and then split by comma
function readFile(filename) {
  text = readTextFromFile(filename)
  lines = text.split('\n');
  data = []
  for each line in lines:
    line.split(',');
    
  return data;
}

// this will calculate the total given an order
function calculateTotal(order){
  return (
    (order.getOunces() * order.getOuncePrice() ) + 
    order.getSquareInchPrice() * 2 * PI * order.getRadius() * order.getRadius() * order.getHeight()
  ) * order.getQuantity();
}

// this will return the eligible discount the customer is entitled to
function getEligibleDiscount(customer){
  if (isPreffered(customer)){
    return customer.discount;
  } else {
    return 0;
  }
}


// this will update the amountspent to the customer and the discount
function updatePreferedStatus ( customer, currentAmountSpent){
  if (currentAmountSpent > 350) {
    customer.amountSpent = currentAmountSpent;
    customer.discount = .1;
    makePrefered(customer);
  } else if ( currentAmountSpent > 200){
    customer.amountSpent = currentAmountSpent;
    customer.discount = .07;
    makePrefered(customer);
  } else if ( currentAmountSpent > 150){
    customer.amountSpent = currentAmountSpent;
    customer.discount = .05;
    makePrefered(customer);
  } else {
    //not yet prefered
    customer.amountSpent = currentAmountSpent;
    updateInArray(customer, customers);
  }
}


// make customer preffered if not already preffered
function makePrefered (customer){
  if (!prefCustomers.contains(customer)){
    prefCustomers.add(customer);
    customers.remove(customer);
  } else {
    updateInArray(customer, customers);
  }
}

// update in an array in place
function updateInArray(item, array){
  index = array.find(item);
  array[index] = item;
}