onasty @ 6e28490

module Shared exposing (Flags, Model, Msg, decoder, init, subscriptions, update)

import Api.Auth

import Auth.User

import Dict

import Effect exposing (Effect)

import Json.Decode

import JwtUtil

import Route exposing (Route)

import Route.Path

import Shared.Model

import Shared.Msg

import Task

import Time

-- FLAGS

type alias Flags =

    { accessToken : Maybe String

    , refreshToken : Maybe String

    , appUrl : String

    }

decoder : Json.Decode.Decoder Flags

decoder =

    Json.Decode.map3 Flags

        (Json.Decode.field "access_token" (Json.Decode.maybe Json.Decode.string))

        (Json.Decode.field "refresh_token" (Json.Decode.maybe Json.Decode.string))

        (Json.Decode.field "app_url" Json.Decode.string)

-- INIT

type alias Model =

    Shared.Model.Model

init : Result Json.Decode.Error Flags -> Route () -> ( Model, Effect Msg )

init flagsResult _ =

    let

        flags =

            flagsResult |> Result.withDefault { accessToken = Nothing, refreshToken = Nothing, appUrl = "" }

        user =

            case

                Maybe.map2 (\access refresh -> { accessToken = access, refreshToken = refresh })

                    flags.accessToken

                    flags.refreshToken

            of

                Just credentials ->

                    Auth.User.SignedIn credentials

                Nothing ->

                    Auth.User.NotSignedIn

    in

    ( { user = user

      , timeZone = Time.utc

      , appURL = flags.appUrl

      }

    , Effect.batch

        [ Time.here |> Task.perform Shared.Msg.GotZone |> Effect.sendCmd

        , Time.now |> Task.perform Shared.Msg.CheckTokenExpiration |> Effect.sendCmd

        ]

    )

-- UPDATE

type alias Msg =

    Shared.Msg.Msg

update : Route () -> Msg -> Model -> ( Model, Effect Msg )

update _ msg model =

    case msg of

        Shared.Msg.GotZone timeZone ->

            ( { model | timeZone = timeZone }, Effect.none )

        Shared.Msg.Logout ->

            ( { model | user = Auth.User.NotSignedIn }, Effect.clearUser )

        Shared.Msg.SignedIn credentials ->

            ( { model | user = Auth.User.SignedIn credentials }

            , Effect.batch

                [ Effect.pushRoute { path = Route.Path.Home_, query = Dict.empty, hash = Nothing }

                , Effect.saveUser credentials.accessToken credentials.refreshToken

                ]

            )

        Shared.Msg.CheckTokenExpiration now ->

            case model.user of

                Auth.User.SignedIn credentials ->

                    if JwtUtil.isExpired now credentials.accessToken then

                        ( model, Effect.refreshTokens )

                    else

                        ( model, Effect.none )

                _ ->

                    ( model, Effect.none )

        Shared.Msg.TriggerTokenRefresh ->

            case model.user of

                Auth.User.SignedIn credentials ->

                    ( { model | user = Auth.User.RefreshingTokens }

                    , Api.Auth.refreshToken

                        { onResponse = Shared.Msg.ApiRefreshTokensResponded

                        , refreshToken = credentials.refreshToken

                        }

                    )

                _ ->

                    ( model, Effect.none )

        Shared.Msg.ApiRefreshTokensResponded (Ok credentials) ->

            ( { model | user = Auth.User.SignedIn credentials }

            , Effect.saveUser credentials.accessToken credentials.refreshToken

            )

        Shared.Msg.ApiRefreshTokensResponded (Err _) ->

            ( { model | user = Auth.User.NotSignedIn }, Effect.clearUser )

-- SUBSCRIPTIONS

subscriptions : Route () -> Model -> Sub Msg

subscriptions _ _ =

    Time.every (30 * 1000) Shared.Msg.CheckTokenExpiration