module Handler.Barcode where import Import getHomeBarcodeR :: Handler Html getHomeBarcodeR = do eub <- handleSelectParam case eub of Just (Left uId) -> do redirect $ SelectR uId Just (Right _) -> do setMessageI MsgBarcodeNotUser redirect $ HomeR Nothing -> do redirect $ HomeR getSelectBarcodeR :: UserId -> Handler Html getSelectBarcodeR uId = do eub <- handleSelectParam case eub of Just (Right bId) -> do redirect $ BuyR uId bId Just (Left _) -> do setMessageI MsgBarcodeNotBev redirect $ SelectR uId Nothing -> redirect $ SelectR uId getSelectCashBarcodeR :: Handler Html getSelectCashBarcodeR = do eub <- handleSelectParam case eub of Just (Right bId) -> do redirect $ BuyCashR bId Just (Left _) -> do setMessageI MsgBarcodeNotBev redirect $ SelectCashR Nothing -> do redirect $ SelectCashR handleSelectParam :: Handler (Maybe (Either UserId BeverageId)) handleSelectParam = do c <- lookupGetParam "barcode" case c of Just code -> do be <- runDB $ getBy $ UniqueBarcode code case be of Just (Entity _ bar) -> do case barcodeIsUser bar of True -> do case (barcodeUser bar, barcodeBev bar) of (Just uId, Nothing) -> return $ Just $ Left uId _ -> error "Malformed barcode" False -> do case (barcodeBev bar, barcodeUser bar) of (Just bId, Nothing) -> return $ Just $ Right bId _ -> error "Malformed barcode" Nothing -> do setMessageI MsgBarcodeUnknown return Nothing Nothing -> do setMessageI MsgProvideBarcode return Nothing