mateamt/src/Types/Purchase.hs

46 lines
856 B
Haskell

{-# LANGUAGE DeriveGeneric #-}
module Types.Purchase where
import Data.Text
import Data.Aeson
import GHC.Generics
data PurchaseDetail = PurchaseDetail
{ pdBeverage :: Int
, pdAmount :: Int
}
deriving (Generic, Show)
instance ToJSON PurchaseDetail where
toEncoding = genericToEncoding defaultOptions
instance FromJSON PurchaseDetail
data PurchaseResult = PurchaseResult
{ prFlag :: PurchaseResultFlag
, prMissingItems :: [PurchaseDetail]
}
deriving (Generic, Show)
instance ToJSON PurchaseResult where
toEncoding = genericToEncoding defaultOptions
instance FromJSON PurchaseResult
data PurchaseResultFlag
= PurchaseOK
| PurchaseDebtful
| PayAmount Int
deriving (Generic, Show)
instance ToJSON PurchaseResultFlag where
toEncoding = genericToEncoding defaultOptions
instance FromJSON PurchaseResultFlag