using System;
using System.Collections.Generic;
using System.Text;
using NUnit.Framework;
using NUnit.Framework.SyntaxHelpers;

namespace Reporting2
{
    [TestFixture]
    public class ReportingTests2
    {
        [Test]
        public void Report_without_OrderItems() {
            var order = new Order { Number = "1234" };

            Assert.That(order.ToReport(), Is.EqualTo("Order #1234" + Environment.NewLine));
        }

        [Test]
        public void Report_with_one_OrderItem() {
            var order = new Order { Number = "1234" };
            order.Add(new OrderItem(1, new Product { Name = "Visual Studio 2008" }, 500.0));

            Assert.That(order.ToReport(), Is.EqualTo(
                "Order #1234" + Environment.NewLine +
                "  1 x Visual Studio 2008 á 500 EUR: 500 EUR" + Environment.NewLine));
        }
    }

    public class Product
    {
        public string Name { get; set; }
    }

    public class OrderItem
    {
        private readonly int m_Amount;
        private readonly Product m_Product;
        private readonly double m_Price;

        public OrderItem(int amount, Product product, double price) {
            m_Amount = amount;
            m_Product = product;
            m_Price = price;
        }

        public int Amount {
            get { return m_Amount; }
        }

        public Product Product {
            get { return m_Product; }
        }

        public double Price {
            get { return m_Price; }
        }

        public string ToReport() {
            return string.Format("  {0} x {1} á {2} EUR: {3} EUR", Amount, Product.Name, Price, Amount * Price);
        }
    }

    public class Order
    {
        private readonly IList<OrderItem> m_OrderItems = new List<OrderItem>();
        public string Number { get; set; }

        public string ToReport() {
            var result = new StringBuilder();
            result.AppendLine(string.Format("Order #{0}", Number));

            foreach (var item in m_OrderItems) {
                result.AppendLine(item.ToReport());
            }

            return result.ToString();
        }

        public void Add(OrderItem item) {
            m_OrderItems.Add(item);
        }
    }
}