protected override bool ValitationWrapper(Proposal proposal)
{
var mainProponent = proposal.MainProponent();
var installmentQuantity = proposal.NumberOfMonthlyInstallments;
var installmentValue = proposal.LoanValue / installmentQuantity;
if (mainProponent == null)
{
return(false);
}
return((mainProponent.Age, mainProponent.MonthlyIncome) switch
{
var(age, monthlyIncome) when age < 24 && monthlyIncome < installmentValue * 4 => false,
var(age, monthlyIncome) when age < 50 && monthlyIncome < installmentValue * 3 => false,
var(age, monthlyIncome) when age >= 50 && monthlyIncome < installmentValue * 2 => false,
_ => true
});