public void CalculateTest()
{
var rateComparasionCalculator = new RateComparasionCalculator();
var left = new Models.Currency("EUR", "321");
var right = new Models.Currency("RUB", "123");
var one = new CurrencyRate(left, right, 1000);
var two = new CurrencyRate(left, right, 1100);
var res = rateComparasionCalculator.Calculate(one, two);
Assert.IsTrue(res.Currency.Equals(right));
Assert.AreEqual(100m, res.Difference);
Assert.AreEqual(10m, res.Percent);
Assert.AreEqual(RateComparasionType.Increased, res.RateComparasionType);
one = new CurrencyRate(left, right, 1000);
two = new CurrencyRate(left, right, 700);
res = rateComparasionCalculator.Calculate(one, two);
Assert.IsTrue(res.Currency.Equals(right));
Assert.AreEqual(300m, res.Difference);
Assert.AreEqual(30m, res.Percent);
Assert.AreEqual(RateComparasionType.Decreased, res.RateComparasionType);
one = new CurrencyRate(left, right, 1000);
two = new CurrencyRate(left, right, 1000);
res = rateComparasionCalculator.Calculate(one, two);
Assert.IsTrue(res.Currency.Equals(right));
Assert.AreEqual(0m, res.Difference);
Assert.AreEqual(0m, res.Percent);
Assert.AreEqual(RateComparasionType.NotChanged, res.RateComparasionType);
}
public RateComparison Calculate(CurrencyRate one, CurrencyRate two)
{
if (!one.Left.Equals(two.Left))
{
throw new FormatException("Left currency must be equals");
}
if (!one.Right.Equals(two.Right))
{
throw new FormatException("Right currency must be equals");
}
var type = one.Rate < two.Rate
? RateComparasionType.Increased
: one.Rate > two.Rate
? RateComparasionType.Decreased
: RateComparasionType.NotChanged;
var onePercent = (one.Rate / 100);
var percent = 100m - (two.Rate/onePercent);
return new RateComparison(one.Right, Math.Abs(percent), Math.Abs(one.Rate - two.Rate), type);
}
public bool TryLoad(CurrencyRateLoadModel currencyRateLoadModel, out CurrencyRate rate)
{
return _cache.TryGetValue(currencyRateLoadModel, out rate);
}
public bool TryLoad(string leftCharCode, string rightCharCode, DateTime day, out CurrencyRate rate)
{
return TryLoad(new CurrencyRateLoadModel(leftCharCode, rightCharCode, day), out rate);
}
public void Save(CurrencyRate rate, DateTime day)
{
var currencyRateLoadModel = new CurrencyRateLoadModel(rate.Left.CharCode, rate.Right.CharCode, day);
_cache.Add(currencyRateLoadModel, rate);
}