Ln/update get highest bid lowest ask (#702)

* invert orders as necessary

* Change function call to quote/base and review

---------

Co-authored-by: diamondhands <[email protected]>

Author: lazynina

routes/dao_coin_exchange_with_fees.go

@@ -1001,18 +1001,18 @@ func (fes *APIServer) GetQuoteCurrencyPriceInUsd(
 }
 
 func (fes *APIServer) GetHighestBidAndLowestAskPriceFromPKIDs(
-	coin1PKID *lib.PKID,
-	coin2PKID *lib.PKID,
+	basePkid *lib.PKID,
+	quotePkid *lib.PKID,
 	utxoView *lib.UtxoView,
 	initialHighestBidPrice float64,
 ) (float64, float64, float64, error) {
 	ordersBuyingCoin1, err := utxoView.GetAllDAOCoinLimitOrdersForThisDAOCoinPair(
-		coin1PKID, coin2PKID)
+		basePkid, quotePkid)
 	if err != nil {
 		return 0, 0, 0, fmt.Errorf("GetDAOCoinLimitOrders: Error getting limit orders: %v", err)
 	}
 	ordersBuyingCoin2, err := utxoView.GetAllDAOCoinLimitOrdersForThisDAOCoinPair(
-		coin2PKID, coin1PKID)
+		quotePkid, basePkid)
 	if err != nil {
 		return 0, 0, 0, fmt.Errorf("GetDAOCoinLimitOrders: Error getting limit orders: %v", err)
 	}
@@ -1033,12 +1033,26 @@ func (fes *APIServer) GetHighestBidAndLowestAskPriceFromPKIDs(
 		if err != nil {
 			return 0, 0, 0, fmt.Errorf("GetQuoteCurrencyPriceInUsd: Error parsing price: %v", err)
 		}
+
+		// Flip orders as needed.
+		appliedOperationType := order.OperationType
 		if order.OperationType == lib.DAOCoinLimitOrderOperationTypeBID &&
+			order.BuyingDAOCoinCreatorPKID.Eq(quotePkid) {
+			priceFloat = 1.0 / priceFloat
+			appliedOperationType = lib.DAOCoinLimitOrderOperationTypeASK
+		}
+		if order.OperationType == lib.DAOCoinLimitOrderOperationTypeASK &&
+			order.SellingDAOCoinCreatorPKID.Eq(quotePkid) {
+			priceFloat = 1.0 / priceFloat
+			appliedOperationType = lib.DAOCoinLimitOrderOperationTypeBID
+		}
+
+		if appliedOperationType == lib.DAOCoinLimitOrderOperationTypeBID &&
 			priceFloat > highestBidPrice {
 
 			highestBidPrice = priceFloat
 		}
-		if order.OperationType == lib.DAOCoinLimitOrderOperationTypeASK &&
+		if appliedOperationType == lib.DAOCoinLimitOrderOperationTypeASK &&
 			priceFloat < lowestAskPrice {
 
 			lowestAskPrice = priceFloat