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|
module Main exposing (..)
import Html exposing (..)
import Json.Decode exposing (Decoder, andThen, fail, string, succeed)
import Json.Decode.Pipeline exposing (decode, required)
main : Program Flags Model msg
main =
Html.programWithFlags
{ init = init
, update = update
, view = view
, subscriptions = subscriptions
}
type alias Flags =
Json.Decode.Value
type alias Model =
{ users : List User
}
type alias User =
{ type_ : UserType
, value : String
}
type UserType
= Class
| Teacher
| Room
| Student
init : Flags -> ( Model, Cmd msg )
init flags =
case Json.Decode.decodeValue decodeUsers flags of
Ok user ->
( Model user, Cmd.none )
Err err ->
Debug.crash err
decodeUsers : Decoder (List User)
decodeUsers =
Json.Decode.list decodeUser
decodeUser : Decoder User
decodeUser =
decode User
|> required "type" decodeUserType
|> required "value" string
decodeUserType : Json.Decode.Decoder UserType
decodeUserType =
string
|> andThen
(\s ->
case s of
"s" ->
succeed Student
"c" ->
succeed Class
"t" ->
succeed Teacher
"r" ->
succeed Room
_ ->
fail ("What the f*ck is " ++ s ++ "?")
)
update : msg -> Model -> ( Model, Cmd msg )
update msg model =
( model, Cmd.none )
view : Model -> Html msg
view model =
text <| toString model
subscriptions : Model -> Sub msg
subscriptions model =
Sub.none
|
