Saving work before I start a notable re-factor

Going to make major changes to how messages are routed/handled.

backend/src/landing.rs

@@ -2,6 +2,13 @@ use serde::{Deserialize, Serialize};
 
 
 #[derive(Serialize)]
-pub struct Landing {
+pub enum DownMsg {
-    pub time : String
+    Greeting(String),
+    TimeUpdate(String),
+}
+
+
+#[derive(Serialize)]
+pub enum UpMsg {
+    RequestGreet(String)
 }

backend/src/main.rs

@@ -9,22 +9,9 @@ use chrono::Local;
 
 mod landing;
 
-
-/// Greeting API structures
-#[derive(Serialize, Deserialize)]
-struct GreetingRequest {
-    name: String,
-}
-
 #[derive(Serialize)]
-struct GreetingResponse {
+enum DownMsg {
-    message: String,
+    Landing(landing::DownMsg),
-}
-
-
-#[derive(Serialize)]
-enum ToFrontend {
-    Landing(landing::Landing)
 }
 
 /// WebSocket actor
@@ -37,7 +24,7 @@ impl Actor for MyWebSocket {
         info!("WebSocket actor started");
         ctx.run_interval(Duration::from_secs(1), |_, ctx| {
             let current_time = Local::now().format("%H:%M:%S").to_string();
-            let message = ToFrontend::Landing(landing::Landing { time: current_time });
+            let message = DownMsg::Landing(landing::DownMsg::TimeUpdate(current_time));
 
             if let Ok(json_message) = serde_json::to_string(&message) {
                 ctx.text(json_message);

frontend/src/Page/Landing.elm

@@ -10,36 +10,52 @@ import Element exposing (Element)
 import Websockets
 import Ports
 import Json.Decode as Decode
+import Json.Encode as Encode exposing (Value)
 import Html.Attributes exposing (placeholder)
 import Element.Input
+import Element.Background
 
 type alias Model = {
-    time : String
+    time : String,
-    }
+    greetWidgetText : String
-type alias Landing = {
-    time : String
     }
+type DownMsgLanding
+    = Greeting String
+    | TimeUpdate String
+
+decodeDownMsgLanding : Decode.Decoder DownMsgLanding
+decodeDownMsgLanding =
+    Decode.oneOf
+        [ Decode.map Greeting (Decode.field "Greeting" Decode.string)
+        , Decode.map TimeUpdate (Decode.field "TimeUpdate" Decode.string)
+        ]
+
+decodeDownMsg : Decode.Decoder Msg
+decodeDownMsg =
+    Decode.map DownMsg decodeDownMsgLanding
+
+type UpMsgLanding = RequestGreet String
+
+encodeUpMsgLanding : UpMsgLanding -> Value
+encodeUpMsgLanding msg =
+    case msg of
+        RequestGreet name ->
+            Encode.object
+                [ ( "RequestGreet", Encode.string name ) ]
+
 type Msg
-    = ToFrontend Landing
+    = DownMsg DownMsgLanding
+    | UpMsg UpMsgLanding
     | DecodeError Decode.Error
     | GreetWidgetText String
     | NoOp
 
 init : () -> Model
 init flags = {
-    time = "time not yet set"
+    time = "time not yet set",
+    greetWidgetText = ""
     }
 
-decodeToFrontend message =
-    let
-        decodeTime = Decode.field "time" Decode.string |> Decode.map Landing
-        decodeLanding = Decode.field "Landing" decodeTime |> Decode.map ToFrontend
-        decodedMessage = Decode.decodeString decodeLanding message
-    in
-        case decodedMessage of
-            Ok decoded -> decoded
-            Err err -> DecodeError err
-
 subscriptions : Model -> Sub Msg
 subscriptions model =
     Ports.socketOnEvent
@@ -47,23 +63,42 @@ subscriptions model =
             (\_ -> NoOp)
             (\_ -> NoOp)
             (\_ -> NoOp)
-            (\message -> (message.data |> decodeToFrontend))
+            (\message ->
+                case Decode.decodeString decodeDownMsg message.data of
+                    Ok msg -> msg
+                    Err err -> DecodeError err
+            )
             (\_ -> NoOp)
         )
 
 update : Msg -> Model -> (Model, Cmd Msg)
 update msg model =
     case msg of
-        ToFrontend landing -> ( {model | time = landing.time}, Cmd.none )
+        DownMsg (TimeUpdate time) -> ( {model | time = time}, Cmd.none )
+        GreetWidgetText text -> ( {model | greetWidgetText = text}, Cmd.none )
         _ -> (model, Cmd.none)
 
-greetWidget =
+greetWidget : Model -> Element Msg
+greetWidget model =
     let
+        idleBlue = Element.Background.color     <| Element.rgb255 18 147 217
+        focusBlue = Element.Background.color    <| Element.rgb255 18 125 184
+
+        myButton = Element.Input.button
+            [ idleBlue
+            , Element.focused [ focusBlue ]
+            ]
+            { onPress = Just <| DownMsg <| Greeting model.greetWidgetText
+            , label = Element.text "My Button"
+            }
+        placeholder  = case model.greetWidgetText of
+            "" -> Just <| Element.Input.placeholder [] <| Element.text "Type Your Name"
+            _ -> Just <| Element.Input.placeholder [] <| Element.text ""
         textInput =
             Element.Input.text []
                 { onChange = GreetWidgetText
-                , text = "text"
+                , text = model.greetWidgetText
-                , placeholder = Nothing
+                , placeholder = placeholder
                 , label = Element.Input.labelHidden "Greet"
                 }
     in
@@ -75,5 +110,5 @@ view model =
     Element.column []
         [ Element.text "Landing"
         , Element.text <| "Current time is : " ++ model.time
-        , greetWidget
+        , greetWidget model
         ]