1 files changed, 54 insertions, 0 deletions
diff --git a/src/client/elm/DecodeFlags.elm b/src/client/elm/DecodeFlags.elm
new file mode 100644
index 0000000..5acc4f9
--- /dev/null
+++ b/src/client/elm/DecodeFlags.elm
@@ -0,0 +1,54 @@
+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 ++ "?")
+            )