54 lines
2.1 KiB
C#
54 lines
2.1 KiB
C#
using System;
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using System.Globalization;
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using System.Linq;
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using EvoCalculator.Core.Models.BaseCalculation.Models.Request;
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using EvoCalculator.Core.Models.BaseCalculation.Models.Response;
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using EvoCalculator.Core.Tools.Array;
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namespace EvoCalculator.Core.Calculation;
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public class BaseCalculation
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{
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private double IRR = 0;
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private Constants.Calculation constants = new();
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public BaseCalculation()
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{
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var envCalculationIRR = Environment.GetEnvironmentVariable("CALCULATION_IRR");
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IRR = float.Parse(envCalculationIRR, CultureInfo.InvariantCulture);
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}
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public ResponseBaseCalculation Calculate(RequestBaseCalculation requestBaseCalculation)
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{
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var initialPaymentSum =
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requestBaseCalculation.car_price * (decimal)(requestBaseCalculation.initial_payment / 100);
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var redemptionPaymentSum = requestBaseCalculation.car_price *
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(decimal)(requestBaseCalculation.redemption_payment / 100);
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var IRRperMonth = Math.Pow(1 + IRR / 12, requestBaseCalculation.lease_period - 2);
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var monthlyPayment = (IRR / 12) *
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(double)((requestBaseCalculation.car_price - initialPaymentSum) *
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(decimal)IRRperMonth - redemptionPaymentSum) / (IRRperMonth - 1);
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var leaseContractSum = (requestBaseCalculation.lease_period - 2) * (decimal)monthlyPayment +
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initialPaymentSum +
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redemptionPaymentSum;
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var vat_reimbursement = leaseContractSum * (decimal)(constants.VatValue / 1.2);
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var tax_savings = leaseContractSum * (decimal)(0.25 / 1.2);
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var schedule = Array<decimal>.Concat(
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new decimal[] { initialPaymentSum }
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, Enumerable.Repeat((decimal)monthlyPayment, requestBaseCalculation.lease_period - 2).ToArray()
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, new decimal[] { redemptionPaymentSum }
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);
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return new ResponseBaseCalculation()
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{
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monthly_payment = (decimal)monthlyPayment,
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tax_savings = tax_savings,
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vat_reimbursement = vat_reimbursement,
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schedule = schedule
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};
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}
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} |