/// <summary>
/// Back calculates the base price for items with included taxes. Based off of the class in AX
/// <c>Tax.calcBaseAmtExclTax_IN</c>.
/// </summary>
/// <param name="baseLine">The base line amount.</param>
/// <param name="codes">The tax codes.</param>
/// <param name="formula">The formula value.</param>
/// <param name="context">The request context.</param>
/// <returns>The base price.</returns>
private static decimal GetBasePriceForTaxIncluded(decimal baseLine, ReadOnlyCollection <TaxCode> codes, FormulaIndia formula, RequestContext context)
{
decimal taxVal; // A summarized tax rate for this code computed from the formula
decimal taxValLine; // The summed tax rates for all codes for this line
decimal amtPerUnitVal; // A summarized amount per unit contribution for this code computed from the formula
decimal amtPerUnitLine; // The summed amount per unit contributions for all codes for this line.
taxValLine = decimal.Zero;
amtPerUnitLine = decimal.Zero;
foreach (var code in codes)
{
taxVal = decimal.Zero;
amtPerUnitVal = decimal.Zero;
if (code.TaxIncludedInPrice)
{
// Handle codes differently based on whether they are India or not.
TaxCodeIndia codeIndia = code as TaxCodeIndia;
if (codeIndia != null)
{
CalculateTaxAmountsIndia(codes, codeIndia, ref amtPerUnitVal, ref taxVal, formula, context);
}
else
{
CalculateTaxAmounts(code, ref amtPerUnitVal, ref taxVal);
}
code.TaxValue = taxVal;
code.AmountPerUnitValue = amtPerUnitVal;
}
taxValLine += taxVal;
amtPerUnitLine += amtPerUnitVal;
}
// Back compute and set the price from price with tax (baseLine).
return((Math.Abs(baseLine) - amtPerUnitLine) / (1 + taxValLine));
}
/// <summary>
/// Calculates the tax amounts india.
/// </summary>
/// <param name="codes">The codes.</param>
/// <param name="codeIndia">The code india.</param>
/// <param name="amtPerUnitVal">The value of the amount per unit.</param>
/// <param name="taxVal">The tax value.</param>
/// <param name="formula">The formula value.</param>
/// <param name="context">The request context.</param>
private static void CalculateTaxAmountsIndia(ReadOnlyCollection <TaxCode> codes, TaxCodeIndia codeIndia, ref decimal amtPerUnitVal, ref decimal taxVal, FormulaIndia formula, RequestContext context)
{
decimal amtPerUnit = decimal.Zero;
decimal taxCodeValue = decimal.Zero;
decimal taxValueLoc;
taxVal = decimal.Zero;
amtPerUnitVal = decimal.Zero;
if (codeIndia.Formula.TaxableBasis != TaxableBasisIndia.ExclusiveLineAmount && codeIndia.Formula.TaxableBasis != formula.TaxableBasis)
{
return;
}
string[] tokens = codeIndia.Formula.ParseExpression();
if (tokens.Length > 1)
{
GetTaxCodeFormulaIndiaDataRequest dataRequest = new GetTaxCodeFormulaIndiaDataRequest(codeIndia.TaxGroup, tokens[1]);
FormulaIndia basisFormula = context.Execute <SingleEntityDataServiceResponse <FormulaIndia> >(dataRequest).Entity;
if (basisFormula != null && basisFormula.TaxableBasis == formula.TaxableBasis)
{
// Iterate through the formula
for (int index = 1; index < tokens.Length; index += 2)
{
TaxCode basisCode = (from c in codes
where c.Code == tokens[index]
select c).FirstOrDefault();
if ((basisCode != null) && !basisCode.Exempt)
{
codeIndia.IsTaxOnTax = true;
if (!codeIndia.taxCodesInFormula.Contains(basisCode.Code))
{
codeIndia.taxCodesInFormula.Add(basisCode.Code);
}
////Either add or subtract the values based on the operator
switch (tokens[index - 1])
{
case "-":
if (basisCode.TaxBase == TaxBase.AmountByUnit)
{
amtPerUnit -= basisCode.AmountPerUnitValue;
}
else
{
taxCodeValue -= basisCode.TaxValue;
}
break;
case "+":
if (basisCode.TaxBase == TaxBase.AmountByUnit)
{
amtPerUnit += basisCode.AmountPerUnitValue;
}
else
{
taxCodeValue += basisCode.TaxValue;
}
break;
default:
RetailLogger.Log.CrtServicesTaxCodeIndiaTaxServiceNotSupportedOperatorFoundInTaxAmountCalculation(tokens[index - 1]);
break;
}
}
}
}
}
taxValueLoc = codeIndia.Value;
if (codeIndia.TaxBase == TaxBase.AmountByUnit)
{
taxVal = decimal.Zero;
amtPerUnitVal = taxValueLoc;
}
else
{
if (codeIndia.Formula.TaxableBasis != TaxableBasisIndia.ExclusiveLineAmount)
{
taxVal = ((1 + taxCodeValue) * taxValueLoc) / 100;
}
else
{
taxVal = (taxCodeValue * taxValueLoc) / 100;
}
taxVal *= (100 - codeIndia.AbatementPercent) / 100;
amtPerUnitVal = amtPerUnit * taxValueLoc / 100;
}
}
/// <summary>
/// Calculates tax for this code for the line item.
/// Updates the line item by adding a new Tax Item.
/// </summary>
/// <param name="codes">The tax codes collection.</param>
/// <param name="taxCodeAmountRounder">The current, accrued totals for this tax code.</param>
/// <returns>The calculated amount of tax.</returns>
public override decimal CalculateTaxAmount(ReadOnlyCollection <TaxCode> codes, TaxCodeAmountRounder taxCodeAmountRounder)
{
if (codes == null)
{
return(decimal.Zero);
}
decimal taxAmount = decimal.Zero;
this.TaxableEntity.ItemTaxGroupId = this.TaxGroup;
taxAmount = this.TaxIncludedInPrice ? this.CalculateTaxIncluded(codes) : this.CalculateTaxExcluded(codes);
string groupRoundingKey = string.Empty;
if (this.TaxGroupRounding)
{
// tax codes already sorted for this taxable item.
foreach (var code in codes)
{
groupRoundingKey += code.Code + "@:$";
}
}
else if (this.TaxLimitBase == TaxLimitBase.InvoiceWithoutVat)
{
// total tax required for whole invoice by this tax code only.
groupRoundingKey = this.Code;
}
// rounding required for above cases and when tax is not zero (not exempted).
if (taxAmount != decimal.Zero)
{
// Adjust tax code amount.
taxAmount = taxCodeAmountRounder.Round(this.TaxContext, this, groupRoundingKey, taxAmount);
}
// Record amounts on line item
TaxLineIndia taxLine = new TaxLineIndia();
taxLine.Amount = taxAmount;
taxLine.Percentage = this.Value;
taxLine.TaxCode = this.Code;
taxLine.TaxGroup = this.TaxGroup;
taxLine.IsExempt = this.Exempt;
taxLine.IsIncludedInPrice = this.TaxIncludedInPrice;
taxLine.TaxComponent = this.GetTaxComponent();
taxLine.IsTaxOnTax = this.IsTaxOnTax;
foreach (string codeInFormula in this.TaxCodesInFormula)
{
if (!taxLine.TaxCodesInFormula.Contains(codeInFormula))
{
taxLine.TaxCodesInFormula.Add(codeInFormula);
}
}
switch (this.Formula.TaxableBasis)
{
case TaxableBasisIndia.MaxRetailPrice:
taxLine.IsIncludedInPrice = false;
break;
case TaxableBasisIndia.ExclusiveLineAmount:
string[] tokens = this.Formula.ParseExpression();
// Iterate through the formula
if (tokens.Length > 1)
{
GetTaxCodeFormulaIndiaDataRequest dataRequest = new GetTaxCodeFormulaIndiaDataRequest(this.TaxGroup, tokens[1]);
FormulaIndia basisFormula = this.RequestContext.Execute <SingleEntityDataServiceResponse <FormulaIndia> >(dataRequest).Entity;
if (basisFormula != null && basisFormula.TaxableBasis == TaxableBasisIndia.MaxRetailPrice)
{
taxLine.IsIncludedInPrice = false;
}
}
break;
default:
break;
}
taxLine.TaxBasis = this.TaxBasis;
this.TaxableEntity.TaxLines.Add(taxLine);
return(taxAmount);
}
