module Update.LoggedView
  ( LoggedAction(..)
  , updateLoggedView
  ) where

import Date
import Dict

import Model exposing (Model)
import Model.User exposing (UserId)
import Model.Payment exposing (..)
import Model.Payers exposing (..)
import Model.View.LoggedView exposing (..)
import Model.View.Payment.Add exposing (..)

import Update.LoggedView.Add exposing (..)
import Update.LoggedView.Monthly exposing (..)

type LoggedAction =
  UpdateAdd AddPaymentAction
  | UpdatePayments Payments
  | AddPayment UserId PaymentId String Int Frequency Payments
  | ToggleEdit PaymentId
  | Remove UserId Int Payments
  | UpdatePage Int Payments
  | UpdateMonthly MonthlyAction

updateLoggedView : Model -> LoggedAction -> LoggedView -> LoggedView
updateLoggedView model action loggedView =
  case action of
    UpdateAdd addPaymentAction ->
      { loggedView | add <- updateAddPayment addPaymentAction loggedView.add }
    UpdatePayments payments ->
      { loggedView | payments <- payments }
    AddPayment userId paymentId name cost frequency payments ->
      { loggedView
      | payments <- payments
      , currentPage <- 1
      , add <- initAddPayment loggedView.add.frequency
      , payers <- updatePayers loggedView.payers userId cost
      , paymentsCount <- loggedView.paymentsCount + 1
      , monthly <-
          if frequency == Monthly
            then
              let payment = Payment paymentId (Date.fromTime model.currentTime) name cost userId
              in  updateMonthly (AddMonthlyPayment payment) loggedView.monthly
            else
              loggedView.monthly
      }
    ToggleEdit id ->
      { loggedView | paymentEdition <- if loggedView.paymentEdition == Just id then Nothing else Just id }
    Remove userId cost payments ->
      { loggedView
      | payments <- payments
      , payers <- updatePayers loggedView.payers userId -cost
      , paymentsCount <- loggedView.paymentsCount - 1
      }
    UpdatePage page payments ->
      { loggedView
      | currentPage <- page
      , payments <- payments
      }
    UpdateMonthly monthlyAction ->
      { loggedView | monthly <- updateMonthly monthlyAction loggedView.monthly }