public void CalculatePrice(ViewModelBooks books)
{
int oriPrice = 100;
//Get min Buy Qty
int minBuyQty = books.BookQty
.Select((v, i) => new { Index = i, Value = v })
.Where(r => r.Value > 0)
.Select(r => r.Value)
.FirstOrDefault();
if (minBuyQty != 0)
{
//Sort
books.BookQty = books.BookQty.OrderBy(r => r).ToArray();
var calcBuyDiscountQty = 0;
for (int i = 0; i < books.BookQty.Count(); i++)
{
int qty = books.BookQty[i];
if (qty < minBuyQty) continue;
books.BookQty[i] = books.BookQty[i] - minBuyQty;
calcBuyDiscountQty++;
}
double discount = GetDiscount(calcBuyDiscountQty);
books.Price += Convert.ToInt32(oriPrice * calcBuyDiscountQty * discount);
CalculatePrice(books);
}
}
public void CalculateTest_Book1_Buy_one_Book2_Buy_one_Book3_Buy_two_Price_370()
{
//arrange
var target = new Books();
var booksInfo = new ViewModelBooks
{
Price = 0,
BookQty = new int[] { 1, 1, 2 }
};
//act
target.CalculatePrice(booksInfo);
//assert
var expected = 370;
Assert.AreEqual(expected, booksInfo.Price);
}
public void CalculateTest_Book1_Buy_two_Book2_Buy_five_Book3_Buy_three_Book4_Buy_Four_Book5_Buy_Two_Price_935()
{
//arrange
var target = new Books();
var booksInfo = new ViewModelBooks
{
Price = 0,
BookQty = new int[] { 2, 5, 3, 4, 2 }
};
//act
target.CalculatePrice(booksInfo);
//assert
var expected = 935;
Assert.AreEqual(expected, booksInfo.Price);
}