Offline worst case trade fees (#274)

* Really basic getSimulated fee function everywhere

* Worst case fees for all exchanges

* Adds tests, fixes comment spacing. Adds wrapper logic. Makes test api key var name consistent. Removes some okcoin ETT tests

* Removes redundant functions

* linting issues. Fixes introduces huobi issues

* More linting

* Stops trying to hide ETT problems, uses iota

* Skips ETT tests for now

exchanges/btse/btse.go

@@ -298,10 +298,17 @@ func (b *BTSE) GetFee(feeBuilder *exchange.FeeBuilder) (float64, error) {
 		fee = getInternationalBankDepositFee(feeBuilder.Amount)
 	case exchange.InternationalBankWithdrawalFee:
 		fee = getInternationalBankWithdrawalFee(feeBuilder.Amount)
+	case exchange.OfflineTradeFee:
+		fee = getOfflineTradeFee(feeBuilder.PurchasePrice, feeBuilder.Amount)
 	}
 	return fee, nil
 }
 
+// getOfflineTradeFee calculates the worst case-scenario trading fee
+func getOfflineTradeFee(price, amount float64) float64 {
+	return 0.0015 * price * amount
+}
+
 // getInternationalBankDepositFee returns international deposit fee
 // Only when the initial deposit amount is less than $1000 or equivalent,
 // BTSE will charge a small fee (0.25% or $3 USD equivalent, whichever is greater).

exchanges/btse/btse_test.go

@@ -140,6 +140,27 @@ func TestFormatWithdrawPermissions(t *testing.T) {
 	}
 }
 
+// TestGetFeeByTypeOfflineTradeFee logic test
+func TestGetFeeByTypeOfflineTradeFee(t *testing.T) {
+	feeBuilder := &exchange.FeeBuilder{
+		FeeType: exchange.CryptocurrencyTradeFee,
+		Pair:    currency.NewPair(currency.BTC, currency.USD),
+		IsMaker: true,
+		Amount:  1000,
+	}
+
+	b.GetFeeByType(feeBuilder)
+	if apiKey == "" || apiSecret == "" {
+		if feeBuilder.FeeType != exchange.OfflineTradeFee {
+			t.Errorf("Expected %v, received %v", exchange.OfflineTradeFee, feeBuilder.FeeType)
+		}
+	} else {
+		if feeBuilder.FeeType != exchange.CryptocurrencyTradeFee {
+			t.Errorf("Expected %v, received %v", exchange.CryptocurrencyTradeFee, feeBuilder.FeeType)
+		}
+	}
+}
+
 func TestGetFee(t *testing.T) {
 	b.SetDefaults()
 	TestSetup(t)

exchanges/btse/btse_wrapper.go

@@ -348,5 +348,9 @@ func (b *BTSE) GetOrderHistory(getOrdersRequest *exchange.GetOrdersRequest) ([]e
 
 // GetFeeByType returns an estimate of fee based on type of transaction
 func (b *BTSE) GetFeeByType(feeBuilder *exchange.FeeBuilder) (float64, error) {
+	if (b.APIKey == "" || b.APISecret == "") && // Todo check connection status
+		feeBuilder.FeeType == exchange.CryptocurrencyTradeFee {
+		feeBuilder.FeeType = exchange.OfflineTradeFee
+	}
 	return b.GetFee(feeBuilder)
 }