public LendersList GetLowestInterestLenders(LendersList availableLenders, double loanRequested)
{
double cashReserved = 0;
var lenders = new List <Lender>();
var lendersSortedByInterest = availableLenders.Lenders.OrderBy(l => l.Rate).ToList();
while (cashReserved < loanRequested)
{
var cashNeeded = loanRequested - cashReserved;
var lender = lendersSortedByInterest.First();
if (lender.Founds >= cashNeeded)
{
lenders.Add(new Lender(lender.Name, lender.Rate, cashNeeded));
cashReserved += cashNeeded;
}
else
{
lenders.Add(lender);
cashReserved += lender.Founds;
}
lendersSortedByInterest.Remove(lender);
}
return(new LendersList(lenders));
}
public dynamic GetDeal(LendersList lenders, int requestedLoan, int loanPeriodInMonths)
{
var reservedLenders = loanDistributor.GetLowestInterestLenders(lenders, requestedLoan);
var totalMonthlyRepayment = reservedLenders.Lenders.Select(
l => repaymentsCalculator.CalculateMonthlyRepaymentsWithCompoundInterest(l.Founds, l.Rate, loanPeriodInMonths)
).Sum();
var totalRepayment = repaymentsCalculator.CalculateTotalRepayment(totalMonthlyRepayment, loanPeriodInMonths);
var averageRate = repaymentsCalculator.AverageInterestCalculator(reservedLenders.Lenders.ToArray());
return(new {
Rate = averageRate,
MonthlyRepayment = totalMonthlyRepayment,
TotalRepayment = totalRepayment
});
}
static void Main(string[] args)
{
var csvFileName = args[0].ToString();
var requestedLoan = int.Parse(args[1]);
var lenders = LendersList.LoadFromCsvFile(csvFileName);
if (requestedLoan <= 0 || requestedLoan > lenders.TotalMoneyAvailable())
{
Console.WriteLine($"it is not possible to provide a quote at this time");
return;
}
var loanCalculator = new LoanCalculator(new LoanDistributor(), new RepaymentsCalculator());
var deal = loanCalculator.GetDeal(lenders, requestedLoan, loanPeriodInMonths);
Console.WriteLine($"Requested amount: £{requestedLoan}");
Console.WriteLine($"Rate: {Math.Round(deal.Rate * 100, 1, MidpointRounding.AwayFromZero).ToString("0.0")}%");
Console.WriteLine($"Monthly repayment: £{Math.Round(deal.MonthlyRepayment, 2, MidpointRounding.AwayFromZero).ToString("0.00")}");
Console.WriteLine($"Total repayment: £{Math.Round(deal.TotalRepayment, 2, MidpointRounding.AwayFromZero).ToString("0.00")}");
}