public CurrencyPrice GetLatestPrice()
{
DbPrice dbPrice = null;
try
{
var prices = _dbContext.Prices
.OrderByDescending(price => price.Timestamp)
.Take(2);
dbPrice = prices.FirstOrDefault();
if (dbPrice != null)
{
var previousPrice = prices.LastOrDefault();
if (previousPrice != dbPrice)
{
var resultPrice = _mapper.Map <CurrencyPrice>(dbPrice);
// TODO: difference should be stored in DB, this calculations should not be in that class.
resultPrice.BuyPriceDiff = (dbPrice.BuyPrice - previousPrice.BuyPrice) / previousPrice.BuyPrice;
resultPrice.SellPriceDiff = (dbPrice.SellPrice - previousPrice.SellPrice) / previousPrice.SellPrice;
return(resultPrice);
}
}
}
catch (SqliteException ex)
{
// in case bd not created yet.
_logger.LogError(ex, "Can be expeceted cause db is completely emtpy");
}
return(_mapper.Map <CurrencyPrice>(dbPrice));
}
public void DbPriceTest()
{
DbPrice price = new DbPrice()
{
GroupId = 1, ProductId = 1, Price = 1m
};
var result = price.Equals(null);
Assert.False(result);
DbPrice differentPrice = new DbPrice()
{
GroupId = 1, ProductId = 2, Price = 1m
};
result = price.Equals(differentPrice);
Assert.False(result);
differentPrice.ProductId = price.ProductId;
differentPrice.Price = price.Price - (price.Delta * 2);
result = price.Equals(differentPrice);
Assert.False(result);
differentPrice.Price = price.Price - (price.Delta / 2);
result = price.Equals(differentPrice);
Assert.True(result);
var priceHash = price.GetHashCode();
var diffPriceHash = differentPrice.GetHashCode();
Assert.NotEqual <int>(priceHash, diffPriceHash);
}
