private decimal CalculatePriceForProductOrder(ProductOrder item)
{
decimal price = 0;
var pricingRule = item.Product.PricingRule;
if (pricingRule == null)
{
// standard pricing
price = item.Quantity * item.Product.UnitPrice;
}
else
{
if (pricingRule.Quantity <= 0)
{
throw new ArgumentOutOfRangeException("Cannot calculate price with invalid quantity on pricing rule");
}
if (pricingRule.Price <= 0)
{
throw new ArgumentOutOfRangeException("Cannot calculate price with invalid pricing rule");
}
var nbrOfUnits = UnitsConverter.GetEquivalentUnit(item.Product.MeasureUnit, pricingRule.MeasureUnit);
//price = item.Quantity * item.Product.UnitPrice;
if (nbrOfUnits < 1)
{
// don't apply the pricing rule
price = nbrOfUnits * item.Product.UnitPrice * item.Quantity;
}
else
{
// apply the pricing rule
// get the total qunatity after unit conversion
var totalQty = item.Quantity * nbrOfUnits;
// calculate the number of discounts corresponding to pricing rule
var nbrOfDiscounts = Math.Floor(totalQty / pricingRule.Quantity);
// calculate the remaing quantity price
// may be calculated with applied pricing rule or with initial price
var restQty = totalQty % pricingRule.Quantity;
price = nbrOfDiscounts * pricingRule.Price;
// calculate the price of remaing quantity depending on the pricing rule
if (item.Product.UnitPrice > 0)
{
price += restQty * item.Product.UnitPrice;
}
else
{
// calculate the unitprice from princing rule
price += restQty * (pricingRule.Price / pricingRule.Quantity);
}
}
}
return(price);
}
public void Test_UnitConvesrionExceptionWhenDifferentType()
{
Assert.Catch(() => UnitsConverter.GetEquivalentUnit(MeasureUnit.KILOGRAM, MeasureUnit.LITER));
}
public void Test_UnitConvesrionExceptionWhenPiece()
{
Assert.Catch(() => UnitsConverter.GetEquivalentUnit(MeasureUnit.PIECE, MeasureUnit.KILOGRAM));
}
public void Test_UnitConvesrionPoundToOunce()
{
Assert.AreEqual(16, UnitsConverter.GetEquivalentUnit(MeasureUnit.POUND, MeasureUnit.OUNCE));
}
public void Test_UnitConvesrionKgToGramm()
{
Assert.AreEqual(1000, UnitsConverter.GetEquivalentUnit(MeasureUnit.KILOGRAM, MeasureUnit.GRAM));
}