public Transfer[] Calculate(Expenditure[] expenditures, string[] partners)
{
var engagements = CalculateEngagements(expenditures, partners);
var credits = CalculateCredits(expenditures, partners);
var transfers = Calculate(engagements, credits);
return transfers.ToArray();
}
public void AbsoluteValueTest()
{
var albina = new Expenditure { Amount = 100, Who = "Глеб" };
var danil = new Expenditure { Amount = 0, Who = "Альбина" };
var gleb = new Expenditure { Amount = 0, Who = "Данил" };
var calculator = new FlowsCalculator();
var transactions = calculator.Calculate(new[] { albina, gleb, danil }, new[] { "Глеб", "Альбина", "Данил" });
}
public void Test()
{
var albina = new Expenditure{Amount = 200, Who = "Глеб"};
var danil = new Expenditure{Amount = 100, Who = "Альбина"};
var gleb = new Expenditure { Amount = 9, Who = "Данил" };
var calculator = new FlowsCalculator();
var transactions = calculator.Calculate(new[] { albina, gleb, danil }, new[] { "Глеб", "Альбина", "Данил" });
transactions.First(x => x.From == "Данил").Amount.Should().Be(94);
transactions.First(x => x.From == "Альбина").Amount.Should().Be(3);
}
public void Test2()
{
var albina = new Expenditure { Amount = 200, Who = "Глеб" };
var danil = new Expenditure { Amount = 674, Who = "Альбина" };
var gleb = new Expenditure { Amount = 500, Who = "Данил" };
var sasha = new Expenditure { Amount = 13, Who = "Санек" };
var calculator = new FlowsCalculator();
var transactions = calculator.Calculate(new[] { albina, gleb, danil, sasha }, new[] { "Глеб", "Альбина", "Данил", "Санек" });
transactions.First(x => (x.From == "Санек" && x.To == "Альбина")).Amount.Should().Be((decimal)327.25);
transactions.First(x => (x.From == "Глеб" && x.To == "Данил")).Amount.Should().Be((decimal)146.75);
transactions.First(x => (x.From == "Санек" && x.To == "Данил")).Amount.Should().Be((decimal)6.5);
}
private List<Transfer> CalculateTransfers(Expenditure[] expenditures, string[] partners)
{
var transfers = new List<Transfer>();
var total = expenditures.Sum(x => x.Amount);
var average = decimal.Round(total / partners.Length, 2);
foreach (var partner in partners)
{
//если этот партнер что-то тратил и он потратил меньше среднего
//то пусть довнесет разницу
if (expenditures.Any(x => x.Who == partner))
{
var partnerExpenditure = expenditures.First(x => x.Who == partner);
if (expenditures.First(x => x.Who == partner).Amount < average)
{
transfers.Add(new Transfer
{
Amount = average - partnerExpenditure.Amount,
From = partner,
To = FundName
});
}
else
{
//если партнер потратил больше среднего
//то пусть возмет из общего котла
transfers.Add(new Transfer
{
Amount = partnerExpenditure.Amount - average,
From = FundName,
To = partner
});
}
}
else
{
//партнер не тратил ничего, так что пусть вносит среднее
transfers.Add(new Transfer
{
Amount = average,
From = partner,
To = FundName
});
}
}
return transfers;
}
public Transfer[] Calculate(Expenditure[] expenditures, string[] partners)
{
var transfers = CalculateTransfers(expenditures, partners);
return transfers.ToArray();
}