/// <summary>
/// Converts an amount from one currency to another.
/// </summary>
/// <param name="in">Currency to convert from</param>
/// <param name="out">Currency to convert to</param>
/// <param name="amount">Amount to convert</param>
/// <returns></returns>
public static decimal Convert(Currency @in, Currency @out, decimal amount)
{
if (amount <= 0)
return 0;
var price = GetPrice(@in, @out);
return price * amount;
}
/// <summary>
/// Returns the marketId needed to find the conversion rate between to currencies.
///
/// If @in does not have its own market or is less significant than @out, then @out's market must be
/// used for the conversion instead. In this case, swapNeeded is set to true so that the caller knows that the actual
/// conversion rate is the reciprocal of the output.
/// </summary>
/// <param name="@in"></param>
/// <param name="@out"></param>
/// <param name="swapNeeded">
/// True if the conversion rate for this marketid needs to be reciprocated to get the correct rate.
/// </param>
/// <returns></returns>
public static string GetMarketId(Currency @in, Currency @out, out bool swapNeeded)
{
Currency currency;
Currency market;
swapNeeded = false;
if (@out.significance > @in.significance)
{
currency = @in;
market = @out;
swapNeeded = true;
}
else
{
currency = @out;
market = @in;
}
return currency + "_" + market;
}
/// <summary>
/// Gets the latest price for the specified market.
/// </summary>
/// <param name="in"></param>
/// <param name="out"></param>
/// <returns>The latest trade price for the market.</returns>
static decimal GetPrice(Currency @in, Currency @out)
{
if (@in.Equals(@out))
return 1;
var swapNeeded = false;
var marketId = GetMarketId(@in, @out, out swapNeeded);
var response = Program.HttpGet("https://www.cryptsy.com/api/v2/markets/" + marketId);
var json = JObject.Parse(response);
var price = decimal.Parse(json["data"]["last_trade"]["price"].ToString(), NumberStyles.Float);
if (swapNeeded)
return 1 / price;
else
return price;
}