module View.Payment
  ( widget
  , PaymentIn(..)
  , PaymentOut(..)
  ) where

import           Data.Text           (Text)
import qualified Data.Text           as T
import           Prelude             hiding (init)
import           Reflex.Dom          (Dynamic, Event, MonadWidget, Reflex)
import qualified Reflex.Dom          as R

import           Common.Model        (Frequency, Init (..), Payment (..),
                                      PaymentId)
import qualified Common.Util.Text    as T
import           View.Payment.Header (HeaderIn (..), HeaderOut (..))
import qualified View.Payment.Header as Header
import           View.Payment.Pages  (PagesIn (..), PagesOut (..))
import qualified View.Payment.Pages  as Pages
import           View.Payment.Table  (TableIn (..), TableOut (..))
import qualified View.Payment.Table  as Table

data PaymentIn = PaymentIn
  { _paymentIn_init :: Init
  }

data PaymentOut = PaymentOut
  {
  }

widget :: forall t m. MonadWidget t m => PaymentIn -> m PaymentOut
widget paymentIn = do
  R.divClass "payment" $ do
    rec
      let init = _paymentIn_init paymentIn
          paymentsPerPage = 7

      payments <- getPayments
        (_init_payments init)
        (_headerOut_addedPayment header)
        (_tableOut_deletedPayment table)

      let searchPayments =
            getSearchPayments
              (_headerOut_searchName header)
              (_headerOut_searchFrequency header)
              payments

      header <- Header.widget $ HeaderIn
        { _headerIn_init = init
        , _headerIn_searchPayments = searchPayments
        }

      table <- Table.widget $ TableIn
        { _tableIn_init = init
        , _tableIn_currentPage = _pagesOut_currentPage pages
        , _tableIn_payments = searchPayments
        , _tableIn_perPage = paymentsPerPage
        }

      pages <- Pages.widget $ PagesIn
        { _pagesIn_total = length <$> searchPayments
        , _pagesIn_perPage = paymentsPerPage
        , _pagesIn_reset = R.leftmost $
            [ fmap (const ()) . R.updated . _headerOut_searchName $ header
            , fmap (const ()) . _headerOut_addedPayment $ header
            ]
        }

    pure $ PaymentOut {}

getPayments
  :: forall t m. MonadWidget t m
  => [Payment]
  -> Event t Payment
  -> Event t PaymentId
  -> m (Dynamic t [Payment])
getPayments initPayments addedPayment deletedPayment =
  R.foldDyn id initPayments $ R.leftmost
    [ flip fmap addedPayment (:)
    , flip fmap deletedPayment (\paymentId -> filter ((/= paymentId) . _payment_id))
    ]

getSearchPayments
  :: forall t. Reflex t
  => Dynamic t Text
  -> Dynamic t Frequency
  -> Dynamic t [Payment]
  -> Dynamic t [Payment]
getSearchPayments name frequency payments = do
  n <- name
  f <- frequency
  ps <- payments
  pure $ flip filter ps (\p ->
    (  (T.search n (_payment_name p) || T.search n (T.pack . show . _payment_cost $ p))
    && (_payment_frequency p == f)
    ))