public void DetermineBetRiskStatus(Bet bet, Customer customer)
{
// Identify unsettled bets that exhibit high risk characteristics
if (bet.BetStatus == BetStatus.Settled)
{
return;
}
// TODO: Clarification required from product owner on relative severity of these business rules.
// All upcoming (i.e. unsettled) bets from customers that win at an unusual rate should
// be highlighted as risky (it is up to you how this is shown)
if (customer.CustomerRiskStatus == CustomerRiskStatus.High)
{
bet.BetRiskStatus = BetRiskStatus.High;
bet.RiskReason = "Customer has been identified as high risk.";
return;
}
// TODO: Clarification required from product owner as to whether these business rules should be cumulative.
// Bets where the amount to be won is $1000 or more.
if (bet.Win > BetWinAmountRiskThreshold)
{
bet.BetRiskStatus = BetRiskStatus.High;
bet.RiskReason =
string.Format("Potential win amount of {0:C} is higher than the risk threshold of {1:C}.", bet.Win,
BetWinAmountRiskThreshold);
return;
}
decimal customerAverageBetStake = Convert.ToDecimal(customer.TotalSettledStake)/
Convert.ToDecimal(customer.NumberOfSettledBets);
// Bets where the stake is more than 30 times higher than that customer’s average bet in
// their betting history should be highlighted as highly unusual
if (bet.Stake > customerAverageBetStake * 30)
{
bet.BetRiskStatus = BetRiskStatus.High;
bet.RiskReason = string.Format("Stake is more than 30 times higher than the customer's average or {0:C}.", customerAverageBetStake);
return;
}
// Bets where the stake is more than 10 times higher than that customer’s average bet in
// their betting history should be highlighted as unusual (again, it is up to you how
// this is shown)
if (bet.Stake > customerAverageBetStake*10)
{
bet.BetRiskStatus = BetRiskStatus.High;
bet.RiskReason = string.Format("Stake is more than 10 times higher than the customer's average or {0:C}.", customerAverageBetStake);
return;
}
}
public void Given_A_Customer_With_No_Settled_Bets_When_Determining_CustomerRiskStatus_Then_Status_Should_Be_Normal()
{
// Arrange
Customer customer = new Customer();
customer.NumberOfSettledBets = 0;
CustomerRiskCalculator calculator = new CustomerRiskCalculator();
// Act
calculator.DetermineCustomerRisk(customer);
// Assert
Assert.AreEqual(CustomerRiskStatus.Normal, customer.CustomerRiskStatus);
}
public void Given_A_Customer_With_More_Than_60_Percent_Winning_Bets_When_Determining_CustomerRiskStatus_Then_Status_Should_Be_High()
{
// Arrange
Customer customer = new Customer();
customer.NumberOfSettledBets = 10000;
customer.NumberOfWinningBets = 6001;
CustomerRiskCalculator calculator = new CustomerRiskCalculator();
// Act
calculator.DetermineCustomerRisk(customer);
// Assert
Assert.AreEqual(CustomerRiskStatus.High, customer.CustomerRiskStatus);
Assert.AreEqual("Customer has won 60.01% of their settled bets, which is higher than the risk threshold of 60.00%.", customer.RiskReason);
}
private Customer BuildCustomer(IGrouping<int, Bet> bets)
{
Customer customer = new Customer();
customer.Id = bets.Key;
customer.TotalNumberOfBets = bets.Count();
customer.NumberOfSettledBets = bets.Count(bet => bet.BetStatus == BetStatus.Settled);
customer.NumberOfUnsettledBets = bets.Count(bet => bet.BetStatus == BetStatus.Unsettled);
customer.NumberOfWinningBets = bets.Count(bet => bet.BetStatus == BetStatus.Settled && bet.Win > 0);
customer.TotalSettledStake = bets.Where(bet => bet.BetStatus == BetStatus.Settled).Sum(bet => bet.Stake);
customer.TotalSettledWin = bets.Where(bet => bet.BetStatus == BetStatus.Settled).Sum(bet => bet.Win);
customer.TotalUnsettledStake = bets.Where(bet => bet.BetStatus == BetStatus.Unsettled).Sum(bet => bet.Stake);
customer.TotalUnsettledWin = bets.Where(bet => bet.BetStatus == BetStatus.Unsettled).Sum(bet => bet.Win);
_customerRiskCalculator.DetermineCustomerRisk(customer);
return customer;
}
public void DetermineCustomerRisk(Customer customer)
{
if (customer.NumberOfSettledBets == 0)
{
return;
}
decimal winningBetPercentage = Convert.ToDecimal(customer.NumberOfWinningBets)/
Convert.ToDecimal(customer.NumberOfSettledBets);
if (winningBetPercentage > WinningBetPercentageRiskThreshold)
{
customer.CustomerRiskStatus = CustomerRiskStatus.High;
customer.RiskReason =
string.Format(
"Customer has won {0:P} of their settled bets, which is higher than the risk threshold of {1:P}.",
winningBetPercentage, WinningBetPercentageRiskThreshold);
}
}
