yammat/Handler/Buy.hs
2015-04-04 06:46:33 +02:00

94 lines
2.8 KiB
Haskell

module Handler.Buy where
import Import
import Handler.Common
import qualified Data.Text as T
import Text.Blaze.Internal
getBuyR :: UserId -> BeverageId -> Handler Html
getBuyR uId bId = do
mTup <- checkData uId bId
case mTup of
Just (user, bev) -> do
(buyWidget, enctype) <- generateFormPost buyForm
defaultLayout $ do
$(widgetFile "buy")
Nothing -> do
setMessage "Benutzer oder Artikel unbekannt"
redirect $ HomeR
postBuyR :: UserId -> BeverageId -> Handler Html
postBuyR uId bId = do
mTup <- checkData uId bId
case mTup of
Just (user, bev) -> do
((res, _), _) <- runFormPost buyForm
case res of
FormSuccess quant -> do
price <- return $ quant * (beveragePrice bev)
sw <- return $ price > (userBalance user)
runDB $ update uId [UserBalance -=. price]
runDB $ update bId [BeverageAmount -=. quant]
checkAlert bId
case sw of
False -> do
setMessage "Viel Vergnügen"
redirect $ HomeR
True -> do
setMessage "Achtung: Guthaben im negativen Bereich"
redirect $ HomeR
_ -> do
setMessage "Etwas ist schief gelaufen"
redirect $ HomeR
Nothing -> do
setMessage "Benutzer oder Artikel unbekannt"
redirect $ HomeR
getBuyCashR :: BeverageId -> Handler Html
getBuyCashR bId = do
mBev <- runDB $ get bId
case mBev of
Just bev -> do
(buyCashWidget, enctype) <- generateFormPost buyForm
defaultLayout $ do
$(widgetFile "buyCash")
Nothing -> do
setMessage "Getrank unbekannt"
redirect $ HomeR
postBuyCashR :: BeverageId -> Handler Html
postBuyCashR bId = do
mBev <- runDB $ get bId
case mBev of
Just bev -> do
((res, _), _) <- runFormPost buyForm
case res of
FormSuccess quant -> do
price <- return $ quant * (beveragePrice bev + 50)
runDB $ update bId [BeverageAmount -=. quant]
updateCashier price "Barzahlung"
checkAlert bId
setMessage $ Content $ Text $ "Viel Vergnügen. Bitte Zahle " `T.append` (T.pack $ show ((fromIntegral price) / 100)) `T.append` " in die Kasse ein"
redirect $ HomeR
_ -> do
setMessage "Etwas ist schief gelaufen"
redirect $ HomeR
Nothing -> do
setMessage "Artikel unbekannt"
redirect $ HomeR
checkData :: UserId -> BeverageId -> Handler (Maybe (User, Beverage))
checkData uId bId = do
mUser <- runDB $ get uId
mBev <- runDB $ get bId
case mUser of
Just user -> do
case mBev of
Just bev -> return $ Just (user, bev)
Nothing -> return Nothing
Nothing -> return Nothing
buyForm :: Form Int
buyForm = renderDivs
$ areq amountField "Anzahl" (Just 1)