module Update.LoggedIn.Account
  ( AccountAction(..)
  , updateAccount
  ) where

import Maybe
import Time exposing (Time)
import Dict

import Model.User exposing (UserId)
import Model.Payer exposing (..)
import Model.View.LoggedIn.Account exposing (..)

import Utils.Maybe exposing (isJust)

type AccountAction =
  ToggleDetail
  | UpdatePayer UserId Time Int
  | ToggleIncomeEdition
  | UpdateIncomeEdition String
  | UpdateEditionError String
  | UpdateIncome Time Int

updateAccount : AccountAction -> Account -> Account
updateAccount action account =
  case action of
    ToggleDetail ->
      { account | visibleDetail <- not account.visibleDetail }
    UpdatePayer userId creation amountDiff ->
      { account | payers <- updatePayers account.payers userId creation amountDiff }
    ToggleIncomeEdition ->
      { account | incomeEdition <-
          if isJust account.incomeEdition
            then Nothing
            else Just (initIncomeEdition (Maybe.withDefault 0 (getCurrentIncome account)))
      }
    UpdateIncomeEdition income ->
      case account.incomeEdition of
        Just incomeEdition ->
          { account | incomeEdition <- Just { incomeEdition | income <- income } }
        Nothing ->
          account
    UpdateEditionError error ->
      case account.incomeEdition of
        Just incomeEdition ->
          { account | incomeEdition <- Just { incomeEdition | error <- Just error } }
        Nothing ->
          account
    UpdateIncome currentTime amount ->
      { account
      | payers <-
          account.payers
            |> Dict.update account.me (\mbPayer ->
              case mbPayer of
                Just payer ->
                  Just
                    { payer
                    | incomes <- payer.incomes ++ [{ creation = currentTime, amount = amount }]
                    }
                Nothing ->
                  Nothing
            )
      , incomeEdition <- Nothing
      }