/// <summary>
/// Calculates the amount of tax for the given value
/// </summary>
/// <param name="value">The value to calculate tax for</param>
/// <returns>The calculated tax</returns>
public decimal Calculate(decimal value)
{
// THE RATE IS ALREADY IN PERCENTAGE, MULTIPLY IT TO COST TO GET TAX AMOUNT
decimal tax = value * this.TaxRate;
return(TaxHelper.Round((decimal)tax, 2, RoundingRule.Common));
}
private static LSDecimal CalculateTax(TaxRule taxRule, LSDecimal price)
{
// DETERMINE TAX FOR TOTAL PRICE
LSDecimal tempTax = ((price * taxRule.TaxRate) / 100);
return(TaxHelper.Round((decimal)tempTax, 2, taxRule.RoundingRule));
}
/// <summary>
/// Calculates the Tax for the given price
/// </summary>
/// <param name="unitPrice">The unit price to calculate Tax for</param>
/// <param name="quantity" >The Quantity of the line item</param>
/// <param name="taxCodeId">The tax code that applies to this price</param>
/// <param name="priority">The priority of the item - 0 for products, can be greater than 0 for non products items.</param>
/// <param name="billingAddress">The billing address that applies to the price</param>
/// <param name="shippingAddress">The shipping address that applies to the price</param>
/// <param name="user">The user being taxed</param>
/// <returns>The Tax details for the given price</returns>
public static TaxInfo InternalGetTaxInfo(LSDecimal unitPrice, int quantity, int taxCodeId, int priority, TaxAddress billingAddress, TaxAddress shippingAddress, User user, bool priceIncludesTax)
{
bool isNegativePrice = (unitPrice < 0);
LSDecimal absPrice = isNegativePrice ? (unitPrice * -1) : unitPrice;
//INITIALIZE TAXES
LSDecimal totalTax = 0;
LSDecimal totalTaxRate = 0;
//GET ANY RULES THAT MAY APPLY TO THESE ADDRESSES
List <TaxRule> taxRules = TaxRuleHelper.GetPotentialTaxRules(taxCodeId, billingAddress, shippingAddress, user);
List <ShopTaxItem> taxItems = new List <ShopTaxItem>();
//LOOP ANY RULES AND CALCULATE THE IMPACT OF Tax
foreach (TaxRule taxRule in taxRules)
{
//PREVENT INCORRECT COMPOUNDING, AND ENSURE TAX MEETS ADDRESS CRITERIA
if (priority < taxRule.Priority && taxRule.AppliesToAddress(billingAddress, shippingAddress))
{
int tempTaxItemCount = taxItems.Count;
if (taxRule.AppliesToTaxCode(taxCodeId))
{
LSDecimal tempTax = LineItemCalculator.CalculateTaxForItem(taxRule, absPrice, quantity, priceIncludesTax);
taxItems.Add(new ShopTaxItem(taxRule.TaxCodeId, tempTax, taxRule.TaxRate));
totalTax += tempTax;
totalTaxRate += taxRule.TaxRate;
}
//CHECK IF THIS TAX APPLIES ON ANY PREEXISTING SHOPTAX ITEMS
for (int i = 0; i < tempTaxItemCount; i++)
{
ShopTaxItem thisItem = taxItems[i];
if (taxRule.AppliesToTaxCode(thisItem.TaxCodeId))
{
//TAX ON TAX, RATE MUST BE CALCULATED
LSDecimal tempTax = LineItemCalculator.CalculateTaxForItem(taxRule, thisItem.Price, 1, priceIncludesTax);
taxItems.Add(new ShopTaxItem(taxRule.TaxCodeId, tempTax, taxRule.TaxRate));
totalTax += tempTax;
totalTaxRate += TaxHelper.Round(((decimal)thisItem.TaxRate * (decimal)taxRule.TaxRate) / 100, 2, taxRule.RoundingRule);
}
}
}
}
if (priceIncludesTax)
{
//IF PRICE IS Tax INCLUSIVE, THEN CALCULATED Tax CANNOT EXCEED PRICE
//THIS WOULD INDICATE A CONFIGURATION ERROR
if (totalTax > absPrice)
{
totalTax = unitPrice;
}
if (totalTaxRate > 100)
{
totalTaxRate = 100;
}
if (isNegativePrice)
{
totalTax = totalTax * -1;
}
LSDecimal actualPrice = unitPrice - totalTax;
return(new TaxInfo(actualPrice, totalTax, totalTaxRate));
}
else
{
if (isNegativePrice)
{
totalTax = totalTax * -1;
}
return(new TaxInfo(unitPrice, totalTax, totalTaxRate));
}
}
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