public void CanComputeBaseAmount()
{
Assert.Equal(1, ChangellyCalculationHelper.ComputeBaseAmount(1, 1));
Assert.Equal(0.5m, ChangellyCalculationHelper.ComputeBaseAmount(1, 0.5m));
Assert.Equal(2, ChangellyCalculationHelper.ComputeBaseAmount(0.5m, 1));
Assert.Equal(4m, ChangellyCalculationHelper.ComputeBaseAmount(1, 4));
}
public async Task <IActionResult> CalculateAmount(string storeId, string fromCurrency, string toCurrency,
decimal toCurrencyAmount, CancellationToken cancellationToken)
{
try
{
var client = await TryGetChangellyClient(storeId);
if (fromCurrency.Equals("usd", StringComparison.InvariantCultureIgnoreCase) ||
fromCurrency.Equals("eur", StringComparison.InvariantCultureIgnoreCase))
{
return(await HandleCalculateFiatAmount(fromCurrency, toCurrency, toCurrencyAmount, cancellationToken));
}
var callCounter = 0;
var baseRate = await client.GetExchangeAmount(fromCurrency, toCurrency, 1);
var currentAmount = ChangellyCalculationHelper.ComputeBaseAmount(baseRate, toCurrencyAmount);
while (true)
{
if (callCounter > 10)
{
BadRequest();
}
var computedAmount = await client.GetExchangeAmount(fromCurrency, toCurrency, currentAmount);
callCounter++;
if (computedAmount < toCurrencyAmount)
{
currentAmount =
ChangellyCalculationHelper.ComputeCorrectAmount(currentAmount, computedAmount,
toCurrencyAmount);
}
else
{
return(Ok(currentAmount));
}
}
}
catch (Exception e)
{
return(BadRequest(new BitpayErrorModel()
{
Error = e.Message
}));
}
}
public void CanComputeCorrectAmount()
{
Assert.Equal(1, ChangellyCalculationHelper.ComputeCorrectAmount(0.5m, 1, 2));
Assert.Equal(0.25m, ChangellyCalculationHelper.ComputeCorrectAmount(0.5m, 1, 0.5m));
Assert.Equal(20, ChangellyCalculationHelper.ComputeCorrectAmount(10, 1, 2));
}
