public static BigInteger AssetPerGold(TradableCurrency ethereumToken, long centsPerAssetRate, long centsPerGoldRate)
{
var decimals = 0;
if (ethereumToken == TradableCurrency.Eth)
{
decimals = TokensPrecision.Ethereum;
}
else
{
throw new NotImplementedException($"Not implemented for { ethereumToken.ToString() }");
}
// round down
return(new BigInteger(centsPerGoldRate) * BigInteger.Pow(10, decimals) / new BigInteger(centsPerAssetRate));
}
public static async Task <SellGoldCryptoResult> SellGoldCryptoRev(
IServiceProvider services,
TradableCurrency ethereumToken,
FiatCurrency fiatCurrency,
BigInteger requiredCryptoAmountWithFee,
long?knownGoldRateCents = null,
long?knownCryptoRateCents = null
)
{
if (requiredCryptoAmountWithFee <= 0)
{
return(new SellGoldCryptoResult());
}
var pricer = services.GetRequiredService <IPriceSource>();
var cryptoRate = (long?)0L;
var decimals = 0;
if (ethereumToken == TradableCurrency.Eth)
{
decimals = TokensPrecision.Ethereum;
cryptoRate = pricer.GetPriceInFiat(CurrencyPrice.Eth, fiatCurrency);
}
else
{
throw new NotImplementedException($"Not implemented for { ethereumToken.ToString() }");
}
cryptoRate = knownCryptoRateCents ?? cryptoRate;
if (cryptoRate == null || cryptoRate <= 0)
{
return(new SellGoldCryptoResult()
{
Status = SellGoldStatus.TradingDisallowed,
});
}
var goldRate = knownGoldRateCents ?? pricer.GetPriceInFiat(CurrencyPrice.Gold, fiatCurrency);
if (goldRate == null || goldRate <= 0)
{
return(new SellGoldCryptoResult()
{
Status = SellGoldStatus.TradingDisallowed,
});
}
var assetPerGold = AssetPerGold(ethereumToken, cryptoRate.Value, goldRate.Value);
// round up
var goldAmount = (requiredCryptoAmountWithFee * BigInteger.Pow(10, decimals) + assetPerGold - 1) / assetPerGold;
return(new SellGoldCryptoResult()
{
Allowed = true,
Status = SellGoldStatus.Success,
Asset = ethereumToken,
ExchangeCurrency = fiatCurrency,
CentsPerGoldRate = goldRate.Value,
CentsPerAssetRate = cryptoRate.Value,
CryptoPerGoldRate = assetPerGold,
ResultGoldAmount = goldAmount,
ResultAssetAmount = requiredCryptoAmountWithFee,
});
}
public static async Task <BuyGoldCryptoResult> BuyGoldCryptoRev(
IServiceProvider services,
TradableCurrency ethereumToken,
FiatCurrency fiatCurrency,
BigInteger requiredGoldAmount,
long?knownGoldRateCents = null,
long?knownCryptoRateCents = null,
double discount = 0d
)
{
if (requiredGoldAmount <= 0)
{
return(new BuyGoldCryptoResult());
}
var pricer = services.GetRequiredService <IPriceSource>();
var cryptoRate = (long?)0L;
if (ethereumToken == TradableCurrency.Eth)
{
cryptoRate = pricer.GetPriceInFiat(CurrencyPrice.Eth, fiatCurrency);
}
else
{
throw new NotImplementedException($"Not implemented for { ethereumToken.ToString() }");
}
cryptoRate = knownCryptoRateCents ?? cryptoRate;
if (cryptoRate == null || cryptoRate <= 0)
{
return(new BuyGoldCryptoResult()
{
Status = BuyGoldStatus.TradingDisallowed,
});
}
var goldRate = knownGoldRateCents ?? pricer.GetPriceInFiat(CurrencyPrice.Gold, fiatCurrency);
if (goldRate == null || goldRate <= 0)
{
return(new BuyGoldCryptoResult()
{
Status = BuyGoldStatus.TradingDisallowed,
});
}
var assetPerGold = AssetPerGold(ethereumToken, cryptoRate.Value, goldRate.Value);
// round up
var cryptoAmount = (requiredGoldAmount * assetPerGold + BigInteger.Pow(10, TokensPrecision.Sumus) - 1) / BigInteger.Pow(10, TokensPrecision.Sumus);
// discount
var cryptoAmountMinusDiscount = GetDiscountRevBody(discount, cryptoAmount);
if (cryptoAmountMinusDiscount < 1)
{
cryptoAmountMinusDiscount = 1;
}
return(new BuyGoldCryptoResult()
{
Allowed = true,
Status = BuyGoldStatus.Success,
Asset = ethereumToken,
ExchangeCurrency = fiatCurrency,
Discount = discount,
CentsPerAssetRate = cryptoRate.Value,
CentsPerGoldRate = goldRate.Value,
CryptoPerGoldRate = assetPerGold,
ResultAssetAmount = cryptoAmountMinusDiscount,
ResultGoldAmount = requiredGoldAmount,
});
}