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{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE PatternGuards #-}
module Model where
import ClassyPrelude.Yesod
import Database.Persist.Quasi
import Control.Monad.Writer
import Data.Text (Text)
import qualified Data.Text as Text
import Data.Map ((!))
import qualified Data.Map as Map
import qualified Data.HashMap.Lazy as HashMap
import Data.Aeson
import Data.Aeson.Types (Parser, Value(..))
import Model.Types
-- You can define all of your database entities in the entities file.
-- You can find more information on persistent and how to declare entities
-- at:
-- http://www.yesodweb.com/book/persistent/
share [mkPersist sqlSettings, mkMigrate "migrateAll"]
$(persistFileWith lowerCaseSettings "config/models")
class HasType a where
fkType :: a -> Key Kind
getType :: ( BaseBackend backend ~ SqlBackend
, MonadIO m
, PersistStoreRead backend
, HasType a
) => a -> ReaderT backend m Kind
getType = getJust . fkType
instance HasType Item where
fkType = itemFkType
instance HasType Reference where
fkType = referenceFkType
instance HasType a => HasType (Entity a) where
fkType = fkType . entityVal
withType :: ( BaseBackend backend ~ SqlBackend
, MonadIO m
, PersistStoreRead backend
, HasType a
) => a -> ReaderT backend m (WithType a)
withType val = (val `WithType`) . kindType <$> getType val
withTypes :: ( BaseBackend backend ~ SqlBackend
, MonadIO m
, PersistStoreRead backend
, PersistQueryRead backend
, HasType a
, Functor f
) => f a -> ReaderT backend m (f (WithType a))
withTypes vals = do
typeMap <- Map.fromList . map (\(Entity kindKey kind) -> (kindKey, kind)) <$> selectList [] []
let
lookupType x = (x `WithType`) . kindType $ typeMap ! fkType x
return $ lookupType <$> vals
instance Ord Item where
x `compare` y = mconcat cmprs
where
cmprs = [ comparing (isNever . itemExpires) x y
, comparing itemOpened x y
, comparing itemExpires x y
, (comparing not `on` itemRunningLow) x y
, comparing itemKind x y
, comparing itemBought x y
]
instance ToJSON Item where
toJSON Item{..} = object $
[ "kind" .= itemKind
, "bought" .= itemBought
, "expires" .= itemExpires
, "opened" .= itemOpened
, "running-low" .= itemRunningLow
]
instance FromJSON Item where
parseJSON = withObject "Item" $ \obj -> do
itemKind <- obj .: "kind"
let
itemNormKind = normalizeKind itemKind
itemBought <- maybe DateUnknown DateKnown <$> obj .:? "bought"
itemExpires <- maybe DateNever DateKnown <$> obj .:? "expires"
itemOpened <- obj .: "opened"
itemRunningLow <- fromMaybe False <$> obj .:? "running-low"
return Item{..}
instance ToJSON (Entity Item) where
toJSON = entityIdToJSON
instance FromJSON (Entity Item) where
parseJSON = entityIdFromJSON
instance ToJSON Reference where
toJSON Reference{..} = String referenceKind
instance FromJSON Reference where
parseJSON = withText "Reference" $ \referenceKind -> do
let
referenceNormKind = normalizeKind referenceKind
return Reference{..}
instance ToJSON (Entity Reference) where
toJSON = keyValueEntityToJSON
instance FromJSON (Entity Reference) where
parseJSON = keyValueEntityFromJSON
normalizeKind :: Text -> Text
normalizeKind = Text.strip . Text.toCaseFold
data ItemDiff = DiffKind Text
| DiffType Text
| DiffBought ItemDate
| DiffExpires ItemDate
| DiffOpened ItemDate
| DiffRunningLow Bool
newtype ItemDiffs = ItemDiffs [ItemDiff]
instance FromJSON ItemDiffs where
parseJSON = withObject "ItemDiff" $ \obj -> fmap ItemDiffs . execWriterT $ do
tell =<< maybe [] (pure . DiffKind) <$> lift (obj .:? "kind")
tell =<< maybe [] (pure . DiffType) <$> lift (obj .:? "type")
tell =<< maybe [] (pure . DiffBought) <$> lift (obj .:! "bought")
tell =<< maybe [] (pure . DiffExpires) <$> lift (obj .:! "expires")
tell =<< maybe [] (pure . DiffOpened) <$> lift (obj .:! "opened")
tell =<< maybe [] (pure . DiffRunningLow) <$> lift (obj .:? "running-low")
toUpdate :: ItemDiffs -> ([Update Item], [Update Kind])
toUpdate (ItemDiffs ds) = mconcat $ do
x <- ds
return $ case x of
DiffKind t -> (, []) [ ItemKind =. t
, ItemNormKind =. normalizeKind t
]
DiffType t -> ([], ) [ KindType =. t ]
DiffBought d -> (, []) [ ItemBought =. d ]
DiffExpires d -> (, []) [ ItemExpires =. d ]
DiffOpened d -> (, []) [ ItemOpened =. d ]
DiffRunningLow b -> (, []) [ ItemRunningLow =. b ]
data WithType a = WithType { typedVal :: a, valType :: Text }
deriving (Eq, Ord, Show, Functor)
typeToJSON :: ToJSON a
=> Text -- ^ Key for value, if needed
-> WithType a -> Value
typeToJSON valKey (record `WithType` t) = Object $ HashMap.insert "type" (toJSON t) o
where
o
| Object o' <- toJSON record = o'
| otherwise = HashMap.singleton valKey $ toJSON record
typeFromJSON :: FromJSON a
=> Maybe Text -- ^ Key for value, if needed
-> Value -> Parser (WithType a)
typeFromJSON valKey = withObject "value with type" $ \obj -> do
t <- obj .: "type"
value <- case valKey of
Just key -> parseJSON =<< obj .: key
Nothing -> parseJSON $ Object obj
return $ value `WithType` t
instance ToJSON (WithType Item) where
toJSON = typeToJSON $ error "Item is not serializing correctly"
instance ToJSON (WithType (Entity Item)) where
toJSON = typeToJSON $ error "Entity Item is not serializing correctly"
instance ToJSON (WithType Reference) where
toJSON = typeToJSON "kind"
instance ToJSON (WithType (Entity Reference)) where
toJSON ((Entity eId ref) `WithType` t) = object
[ "id" .= eId
, "type" .= t
, "kind" .= referenceKind ref
]
instance FromJSON (WithType Item) where
parseJSON = typeFromJSON Nothing
instance FromJSON (WithType Reference) where
parseJSON = typeFromJSON $ Just "kind"
|
