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module Model.Payment
( getPayments
, createPayment
, paymentKeyToText
, deleteOwnPayment
, getTotalPayments
) where
import Data.Text (Text)
import qualified Data.Text as T
import Data.Time.Clock (getCurrentTime)
import Data.Maybe (catMaybes)
import Control.Monad.IO.Class (liftIO)
import Database.Persist
import qualified Database.Persist as P
import Database.Esqueleto
import qualified Database.Esqueleto as E
import Model.Database
import qualified Model.Json.Payment as P
import qualified Model.Json.TotalPayment as TP
getPayments :: Persist [P.Payment]
getPayments = do
xs <- select $
from $ \(payment `InnerJoin` user) -> do
on (payment ^. PaymentUserId E.==. user ^. UserId)
where_ (isNothing (payment ^. PaymentDeletedAt))
return (payment, user)
return (map getJsonPayment xs)
getJsonPayment :: (Entity Payment, Entity User) -> P.Payment
getJsonPayment (paymentEntity, userEntity) =
let payment = entityVal paymentEntity
user = entityVal userEntity
in P.Payment
{ P.id = paymentKeyToText . entityKey $ paymentEntity
, P.creation = paymentCreation payment
, P.name = paymentName payment
, P.cost = paymentCost payment
, P.userName = userName user
}
paymentKeyToText :: Key Payment -> Text
paymentKeyToText = T.pack . show . unSqlBackendKey . unPaymentKey
createPayment :: UserId -> Text -> Int -> Persist PaymentId
createPayment userId name cost = do
now <- liftIO getCurrentTime
insert $ Payment userId now name cost Nothing
deleteOwnPayment :: Entity User -> PaymentId -> Persist Bool
deleteOwnPayment user paymentId = do
mbPayment <- get paymentId
case mbPayment of
Just payment ->
if paymentUserId payment == entityKey user
then do
now <- liftIO getCurrentTime
P.update paymentId [PaymentDeletedAt P.=. Just now]
return True
else
return False
Nothing ->
return False
getTotalPayments :: Persist [TP.TotalPayment]
getTotalPayments = do
values <- select $
from $ \(payment `InnerJoin` user) -> do
on (payment ^. PaymentUserId E.==. user ^. UserId)
where_ (isNothing (payment ^. PaymentDeletedAt))
groupBy (payment ^. PaymentUserId)
return (user ^. UserName, sum_ (payment ^. PaymentCost))
return $ catMaybes . map (getTotalPayment . unValueTuple) $ values
getTotalPayment :: (Text, Maybe Int) -> Maybe TP.TotalPayment
getTotalPayment (userName, Just cost) = Just (TP.TotalPayment userName cost)
getTotalPayment (_, Nothing) = Nothing
unValueTuple :: (Value a, Value b) -> (a, b)
unValueTuple (Value a, Value b) = (a, b)
|
