{-# LANGUAGE OverloadedStrings #-}

module Model.Payment
  ( getPayments
  , getMonthlyPayments
  , createPayment
  , deleteOwnPayment
  ) where

import Data.Text (Text)
import Data.Time.Clock (getCurrentTime)

import Control.Monad.IO.Class (liftIO)

import Database.Persist

import Model.Database
import Model.Frequency
import qualified Model.Json.Payment as P

getPayments :: Persist [P.Payment]
getPayments =
  map getJsonPayment <$> selectList
    [ PaymentDeletedAt ==. Nothing ]
    [ Desc PaymentCreation ]

getMonthlyPayments :: Persist [Entity Payment]
getMonthlyPayments =
  selectList
    [ PaymentDeletedAt ==. Nothing
    , PaymentFrequency ==. Monthly
    ]
    [ Desc PaymentName ]

getJsonPayment :: Entity Payment -> P.Payment
getJsonPayment paymentEntity =
  let payment = entityVal paymentEntity
  in  P.Payment
        { P.id = entityKey paymentEntity
        , P.creation = paymentCreation payment
        , P.name = paymentName payment
        , P.cost = paymentCost payment
        , P.userId = paymentUserId payment
        , P.frequency = paymentFrequency payment
        }

createPayment :: UserId -> Text -> Int -> Frequency -> Persist PaymentId
createPayment userId name cost frequency = do
  now <- liftIO getCurrentTime
  insert (Payment userId now name cost Nothing frequency)

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
          update paymentId [PaymentDeletedAt =. Just now]
          return True
        else
          return False
    Nothing ->
      return False