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

import Time exposing (Time)

import Model exposing (Model)
import Model.Payment exposing (Payments)
import Model.Payers exposing (Payers)
import Model.View as V
import Model.View.SignInView exposing (..)
import Model.View.PaymentView exposing (..)

import Update.SignIn exposing (..)
import Update.Payment exposing (..)

type Action =
  NoOp
  | UpdateTime Time
  | GoSignInView
  | SignInError String
  | UpdateSignIn SignInAction
  | GoPaymentView String Payments Payers
  | UpdatePayment PaymentAction

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 }
    GoPaymentView userName payments payers ->
      { model | view <- V.PaymentView (initPaymentView userName payments 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
    UpdatePayment paymentAction ->
      case model.view of
        V.PaymentView paymentView ->
          { model | view <- V.PaymentView (updatePayment model paymentAction paymentView) }
        _ ->
          model