module Handler.UpdateItem where

import Import

import Handler.Common

getUpdateItemR, postUpdateItemR :: ItemId -> Handler TypedContent
getUpdateItemR = postUpdateItemR
postUpdateItemR fsUpdateId = do
  Just entity <- fmap (Entity fsUpdateId) <$> runDB (get fsUpdateId)
  
  ((updateResult, fsUpdateForm), fsUpdateEncoding) <- runFormPost . itemForm . Just $ entityVal entity

  mapM_ (addMessage "formError" . toHtml) =<< case updateResult of 
    FormSuccess Item{..} -> [] <$ runDB (update fsUpdateId [ ItemKind =. itemKind
                                                           , ItemNormKind =. normalizeKind itemKind
                                                           , ItemBought =. itemBought
                                                           , ItemExpires =. itemExpires
                                                           , ItemOpened =. itemOpened
                                                           ])
    FormFailure errors -> return errors
    _ -> return []

  selectRep $ do
    provideRep $ case updateResult of
      FormSuccess _ -> redirect $ InventoryListingR :#: fsUpdateId :: Handler Html
      _ -> do
        (sortOn entityVal -> stock) <- runDB $ selectList [] []
        defaultLayout $ inventoryListing InventoryState
          { invFormState = Just UpdateForm{..}
          , ..
          }
    provideJson ()