/// <summary>
/// Function to show input form and output to user
/// </summary>
public static void ShowForm()
{
var myJsonString = File.ReadAllText("Items.json");
List <Item> items = JsonConvert.DeserializeObject <List <Item> >(myJsonString);
Console.WriteLine("Following items are available for purchase - \n");
foreach (Item item in items)
{
Console.WriteLine("Item Name: {0}- {1}{2} {3} ", item.Description, item.Price, item.PriceUnit, item.Size);
}
Console.WriteLine("Please enter the quantity of each item you would like to buy following by space. Enter 0 for item not needed. \n");
Console.Write("Items- ");
string[] quantities = Console.ReadLine().Trim().Split(' ');
if (quantities.Count() == 0)
{
Console.WriteLine("Values entered for item quantity is not correct. Please enter again ");
Console.Write("Items- ");
}
// chec if input is valid and calculate total price
if (Helper.CheckInteger(quantities))
{
for (int i = 0; i < items.Count; i++)
{
if (i < quantities.Length)
{
items[i].Quantiity = Convert.ToInt32(quantities[i]);
}
}
CalculatePrice calculateAmount = new CalculatePrice();
PriceCalculation totoalAmount = calculateAmount.CalculateTotalPrice(items);
Console.WriteLine("Subtotal: \u00A3{0}", Math.Round(totoalAmount.Subtotoal, 2));
foreach (ItemDiscount item in totoalAmount.ItemDiscount)
{
if (!String.IsNullOrEmpty(item.DiscountPercentage.ToString()) && item.DiscountAmount > 0)
{
Console.WriteLine("{0}- {1}% off: -\u00A3{2}", item.Description, item.DiscountPercentage, Math.Round(item.DiscountAmount, 2));
}
}
Console.WriteLine("Total discount: \u00A3{0}", Math.Round(totoalAmount.TotalDiscount, 2));
if (totoalAmount.TotalDiscount == 0)
{
Console.WriteLine("(No offers available)");
}
Console.WriteLine("Total: \u00A3{0}", Math.Round((totoalAmount.Subtotoal - totoalAmount.TotalDiscount), 2));
Console.WriteLine("\nPress any key to start again.");
}
// if input is not valid, ask user to enter again
else
{
Console.WriteLine("Values entered for item quantity is not correct. Please enter again ");
Console.Write("Items- ");
}
ConsoleKey readKey = Console.ReadKey().Key;
if (readKey == ConsoleKey.Escape)
{
Environment.Exit(0);
}
else
{
ShowForm();
}
}
/// <summary>
/// Function to calculate price of input items.
/// </summary>
/// <param name="items"></param>
/// <returns></returns>
public PriceCalculation CalculateTotalPrice(List <Item> items)
{
PriceCalculation price = new PriceCalculation();
price.ItemDiscount = new List <ItemDiscount>();
try
{
// calculate direct percentage disocunt
foreach (Item item in items)
{
//calculate price of each item
double itemprice;
double discount = 0;
if (String.IsNullOrEmpty(item.DiscountPercentage.ToString()))
{
if (item.PriceUnit == Cuurency.p.ToString())
{
itemprice = ((double)((Convert.ToInt32(item.Quantiity) * Convert.ToInt32(item.Price))) / 100);
}
else
{
itemprice = (Convert.ToInt32(item.Quantiity) * Convert.ToDouble(item.Price));
}
}
else
{
if (item.PriceUnit == Cuurency.p.ToString())
{
itemprice = ((double)(Convert.ToInt32(item.Quantiity) * Convert.ToInt32(item.Price)) / 100);
discount = (itemprice * (Convert.ToInt32(item.DiscountPercentage))) / 100;
}
else
{
itemprice = (Convert.ToInt32(item.Quantiity) * Convert.ToDouble(item.Price));
discount = (itemprice * (Convert.ToInt32(item.DiscountPercentage))) / 100;
}
}
price.ItemDiscount.Add(new ItemDiscount
{
ItemCode = item.ItemCode,
Description = item.Description,
DiscountPercentage = item.DiscountPercentage,
DiscountAmount = discount,
ItemPrice = itemprice
});
price.Subtotoal = price.Subtotoal + itemprice;
price.TotalDiscount = price.TotalDiscount + discount;
}
// calculate for extended discount items
// example: Buy 2 cans of Bean and get a loaf of bread for half price
// This will be applied if there is no original discount on second item such as bread
foreach (Item item in items)
{
foreach (FurtherDiscount furtherDiscount in item.FurtherDiscount)
{
if (!String.IsNullOrEmpty(furtherDiscount.OnItemPurchased))
{
if (Convert.ToInt32(furtherDiscount.OnItemPurchased) > 0 && Convert.ToInt32(furtherDiscount.OnItemPurchased) <= item.Quantiity)
{
string discountedItem = furtherDiscount.DiscountedItemCode;
// apply extended discount only if there is no orginal discount on item
if ((String.IsNullOrEmpty(items.Find(x => x.ItemCode == discountedItem).DiscountPercentage)))
{
// update discount details for item
price.ItemDiscount.Find(x => x.ItemCode == discountedItem).DiscountPercentage = furtherDiscount.DiscountPercentage;
price.ItemDiscount.Find(x => x.ItemCode == discountedItem).DiscountAmount =
((double)price.ItemDiscount.Find(x => x.ItemCode == discountedItem).ItemPrice) *
(Convert.ToInt32(furtherDiscount.DiscountPercentage)) / 100;
// update total discount
price.TotalDiscount = price.TotalDiscount + ((double)price.ItemDiscount.Find(x => x.ItemCode == discountedItem).ItemPrice) *
(100 - Convert.ToInt32(furtherDiscount.DiscountPercentage)) / 100;
}
}
}
}
}
return(price);
}
catch (Exception ex)
{
// write exception to logger and throw exception
return(price);
}
}
