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module Update
  ( update
  ) where

import Task

import Effects exposing (Effects)

import Server

import Model exposing (Model)
import Model.Translations exposing (getMessage)
import Model.Action exposing (..)
import Model.Action.LoggedInAction exposing (LoggedInAction)
import Model.View as V
import Model.View.LoggedInView exposing (..)

import SignIn.Model as SignInModel
import SignIn.Action as SignInAction
import SignIn.Update as SignInUpdate

import Update.LoggedIn exposing (updateLoggedIn)

import Utils.Http exposing (errorKey)

update : Action -> Model -> (Model, Effects Action)
update action model =
  case action of

    NoOp ->
      (model, Effects.none)

    SignIn email ->
      ( applySignIn model (SignInAction.WaitingServer)
      , Server.signIn email
          |> Task.map (always (UpdateSignIn SignInAction.ValidLogin))
          |> flip Task.onError (\error ->
               Task.succeed (UpdateSignIn (SignInAction.ErrorLogin (errorKey error)))
             )
          |> Effects.task
      )

    GoLoggedInView init ->
      ( { model | view = V.LoggedInView (initLoggedInView init) }
      , Effects.none
      )

    UpdateTime time ->
      ({ model | currentTime = time }, Effects.none)

    GoSignInView ->
      ({ model | view = V.SignInView (SignInModel.init Nothing) }, Effects.none)

    UpdateSignIn signInAction ->
      (applySignIn model signInAction, Effects.none)

    UpdateLoggedIn loggedInAction ->
      applyLoggedIn model loggedInAction

    SignOut ->
      ( model
      , Server.signOut
          |> Task.map (always GoSignInView)
          |> flip Task.onError (always <| Task.succeed NoOp)
          |> Effects.task
      )

applySignIn : Model -> SignInAction.Action -> Model
applySignIn model signInAction =
  case model.view of
    V.SignInView signInView ->
      { model | view = V.SignInView (SignInUpdate.update model.translations signInAction signInView) }
    _ ->
      model

applyLoggedIn : Model -> LoggedInAction -> (Model, Effects Action)
applyLoggedIn model loggedInAction =
  case model.view of
    V.LoggedInView loggedInView ->
      let (loggedInView, effects) = updateLoggedIn model loggedInAction loggedInView
      in  ( { model | view = V.LoggedInView loggedInView }
          , Effects.map UpdateLoggedIn effects
          )
    _ ->
      (model, Effects.none)