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module DecodeFlags exposing (Flags, init)
import Json.Decode exposing (Decoder, andThen, fail, string, succeed)
import Json.Decode.Pipeline exposing (decode, required)
import Model exposing (..)
type alias Flags =
Json.Decode.Value
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 ++ "?")
)
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