private static List <ShoppingBasketItem> AddItemToBasket(List <ShoppingBasketItem> currentBasket, ShoppingBasketItem itemToAdd)
{
bool itemAdded = false;
// If basket is empty, just add the item.
if (currentBasket.Count == 0)
{
currentBasket.Add(itemToAdd);
itemAdded = true;
}
// If the basket is not empty, check whether the item already exists in the basket.
else
{
foreach (ShoppingBasketItem item in currentBasket)
{
if (item.ItemCode == itemToAdd.ItemCode)
{
// If we have a match, update the quantity.
item.Quantity = item.Quantity + itemToAdd.Quantity;
itemAdded = true;
}
}
// If the item didn't already exist in the basket, add as normal.
if (!itemAdded)
{
currentBasket.Add(itemToAdd);
}
}
return(currentBasket);
}
static void Main(string[] args)
{
// Any classes added to this project are in place of the usual process I would use.
// I would usually have a set of DBMLs containing stored procedures for data manipulation and object definitons.
// Program variables used during processing.
string input;
string itemCode;
int itemQuantity;
decimal itemCost;
decimal itemBaseCost;
ShoppingBasketItem itemToAdd;
// Shopping basket stores a list of ShoppingBasketItems representing the current shopping basket.
List <ShoppingBasketItem> currentBasket = new List <ShoppingBasketItem>();
// Load the prices. Usually from an external source.
List <ShoppingItem> prices = new List <ShoppingItem>();
prices.Add(new ShoppingItem("A99", 0.5m));
prices.Add(new ShoppingItem("B15", 0.3m));
prices.Add(new ShoppingItem("C40", 1.8m));
prices.Add(new ShoppingItem("T23", 0.99m));
// Load the products. Usually from an external source.
List <string> products = new List <string>();
products.Add("A99");
products.Add("B15");
products.Add("C40");
products.Add("T23");
// Load the original offers. These can be changed via command line. Usually from an external source.
List <SpecialOffer> specialOffers = new List <SpecialOffer>();
SpecialOffer offer = new SpecialOffer("A99", 3, 1.30m, 0.5m);
specialOffers.Add(offer);
offer = new SpecialOffer("B15", 2, 0.45m, 0.3m);
specialOffers.Add(offer);
// Output the start up text.
Console.WriteLine("Welcome to the shopping basket application.");
Console.WriteLine("At any time, you can press 'q' to quit, or 'c' to checkout.");
Console.WriteLine("Press 'o' to update offers or enter an item code to start shopping.");
do
{
input = Console.ReadLine();
// Check if the user is trying to go to the check out at any time.
if (input == "c")
{
// Function calculates the total cost of the basket, taking special offers into account.
decimal totalPrice = Checkout(currentBasket, prices, specialOffers);
// Output total price and then allow user to quit or restart.
Console.WriteLine("Your total price is: £" + totalPrice + ". Press 'q' to quit or 'r' to restart the appliation.");
string finalStep = Console.ReadLine();
while ((finalStep != "q") && (finalStep != "r"))
{
Console.WriteLine("Your total price is: £" + totalPrice + ". Press 'q' to quit or 'r' to restart the appliation.");
finalStep = Console.ReadLine();
}
if (finalStep == "q")
{
Environment.Exit(0);
}
else if (finalStep == "r")
{
var fileName = Assembly.GetExecutingAssembly().Location;
System.Diagnostics.Process.Start(fileName);
}
}
// Check if the user is trying to quit.
else if (input == "q")
{
Environment.Exit(0);
}
// Check if user is trying to change the offers.
else if (input == "o")
{
// Allow updating of offers.
Console.WriteLine("Please enter the item code to update the related offer.");
input = Console.ReadLine();
// Validate the input until the user enters a valid item code.
itemCode = ValidateItemCode(input, products);
Console.WriteLine("Please enter the quantity of the item relating to your offer.");
input = Console.ReadLine();
// Validate the input until the user enters a valid item quantity.
itemQuantity = ValidateQuantity(input);
Console.WriteLine("Please enter the total cost of the items relating to your offer.");
input = Console.ReadLine();
// Validate the input until the user enter a valid item cost.
itemCost = ValidateCost(input);
itemBaseCost = GetItemBaseCost(prices, itemCode);
// Update special offers to contain the new offer.
specialOffers = UpdateSpecialOffer(itemCode, itemQuantity, itemCost, itemBaseCost, specialOffers);
Console.WriteLine("Offers updated. Please enter a product code to begin shopping.");
}
// Else deal with new item to add.
else
{
itemCode = ValidateItemCode(input, products);
Console.WriteLine("Please enter your desired quantity.");
input = Console.ReadLine();
itemQuantity = ValidateQuantity(input);
itemToAdd = new ShoppingBasketItem(itemCode, itemQuantity);
currentBasket = AddItemToBasket(currentBasket, itemToAdd);
Console.WriteLine("Item added to basket. Enter another item code to add another item, press c to go to the check out or press q to quit.");
}
} while ((input != "q") && (input != "c"));
}
