module Update
  ( Action(..)
  , actions
  , updateModel
  ) where

import Time exposing (Time)

import Model exposing (Model)
import Model.User exposing (Users, UserId)
import Model.Payment exposing (Payments)
import Model.Payers exposing (Payers)
import Model.View as V
import Model.View.SignInView exposing (..)
import Model.View.LoggedView exposing (..)

import Update.SignIn exposing (..)
import Update.LoggedView exposing (..)

type Action =
  NoOp
  | UpdateTime Time
  | GoSignInView
  | SignInError String
  | UpdateSignIn SignInAction
  | GoLoggedView Users UserId Payments Payments Int Payers
  | UpdateLoggedView LoggedAction

actions : Signal.Mailbox Action
actions = Signal.mailbox NoOp

updateModel : Action -> Model -> Model
updateModel action model =
  case action of
    NoOp ->
      model
    UpdateTime time ->
      { model | currentTime <- time }
    GoSignInView ->
      { model | view <- V.SignInView initSignInView }
    GoLoggedView users me monthlyPayments payments paymentsCount payers ->
      { model | view <- V.LoggedView (initLoggedView users me monthlyPayments payments paymentsCount payers) }
    SignInError msg ->
      let signInView = { initSignInView | result <- Just (Err msg) }
      in  { model | view <- V.SignInView signInView }
    UpdateSignIn signInAction ->
      case model.view of
        V.SignInView signInView ->
          { model | view <- V.SignInView (updateSignIn signInAction signInView) }
        _ ->
          model
    UpdateLoggedView loggedAction ->
      case model.view of
        V.LoggedView loggedView ->
          { model | view <- V.LoggedView (updateLoggedView model loggedAction loggedView) }
        _ ->
          model