public Order GetOrder(int id)
{
TextReader textReader = File.OpenText(dataDirectory + "/orders.txt");
var csv = new CsvReader(textReader);
var orders = csv.GetRecords<Order>();
return orders.SingleOrDefault(x => x.Id == id);
}
public int GetPromotionalDiscount(string coupon)
{
using (TextReader textReader = new StreamReader(dataDirectory + "/discounts.txt"))
{
var csv = new CsvReader(textReader);
var discounts = csv.GetRecords<Discount>();
var discount = discounts.SingleOrDefault(x => x.Coupon == coupon);
if (discount == null)
throw new Exception("Coupon not found");
return discount.Percentage;
}
}
public void SaveOrder(Order order)
{
var orders = new List<Order>();
using (TextReader textReader = new StreamReader(dataDirectory + "/orders.txt"))
{
var csvReader = new CsvReader(textReader);
orders = csvReader.GetRecords<Order>().ToList();
}
var orderSaved = orders.SingleOrDefault(x => x.Id == order.Id);
if (orderSaved != null)
throw new Exception("Primary Constraint Exception: another object already exists with same Id");
orders.Add(order);
using (TextWriter textWriter = new StreamWriter(dataDirectory + "/orders.txt"))
{
var csvWriter = new CsvWriter(textWriter);
csvWriter.WriteRecords(orders);
}
}
