51 lines
1.9 KiB
C#
51 lines
1.9 KiB
C#
using System;
|
|
using System.Linq;
|
|
using EvoCalculator.Core.Models.BaseCalculation.Models.Request;
|
|
using EvoCalculator.Core.Models.BaseCalculation.Models.Response;
|
|
using EvoCalculator.Core.Tools.Array;
|
|
|
|
namespace EvoCalculator.Core.Calculation;
|
|
|
|
public class BaseCalculation
|
|
{
|
|
const double IRR = 0.155;
|
|
private Constants.Calculation constants;
|
|
|
|
public BaseCalculation()
|
|
{
|
|
this.constants = new Constants.Calculation();
|
|
}
|
|
|
|
public ResponseBaseCalculation Calculate(RequestBaseCalculation requestBaseCalculation)
|
|
{
|
|
var initialPaymentSum =
|
|
requestBaseCalculation.car_price * (decimal) (requestBaseCalculation.initial_payment / 100);
|
|
var redemptionPaymentSum = requestBaseCalculation.car_price *
|
|
(decimal) (requestBaseCalculation.redemption_payment / 100);
|
|
|
|
var IRRperMonth = Math.Pow(1 + IRR / 12, requestBaseCalculation.lease_period - 2);
|
|
var monthlyPayment = (IRR / 12) *
|
|
(double) ((requestBaseCalculation.car_price - initialPaymentSum) *
|
|
(decimal) IRRperMonth - redemptionPaymentSum) / (IRRperMonth - 1);
|
|
|
|
var leaseContractSum = (requestBaseCalculation.lease_period - 2) * (decimal) monthlyPayment +
|
|
initialPaymentSum +
|
|
redemptionPaymentSum;
|
|
var taxSavings = leaseContractSum * (decimal) (constants.VatValue / 1.2);
|
|
|
|
var schedule = Array<decimal>.Concat(
|
|
new decimal[] {initialPaymentSum}
|
|
, Enumerable.Repeat((decimal) monthlyPayment, requestBaseCalculation.lease_period - 2).ToArray()
|
|
, new decimal[] {redemptionPaymentSum}
|
|
);
|
|
|
|
|
|
return new ResponseBaseCalculation()
|
|
{
|
|
monthly_payment = (decimal) monthlyPayment,
|
|
tax_savings = taxSavings,
|
|
vat_reimbursement = taxSavings,
|
|
schedule = schedule
|
|
};
|
|
}
|
|
} |