Start adding some concepts around UI state

visions/ui/src/main.rs

@@ -1,13 +1,54 @@
+use std::rc::Rc;
+
 use yew::prelude::*;
 
+struct AuthInfo {
+    session_id: Option<String>,
+}
+
+impl Default for AuthInfo {
+    fn default() -> Self {
+        Self { session_id: None }
+    }
+}
+
+enum AuthAction {
+    Auth(String),
+    Unauth,
+}
+
+impl Reducible for AuthInfo {
+    type Action = AuthAction;
+
+    fn reduce(self: Rc<Self>, action: Self::Action) -> Rc<Self> {
+        match action {
+            AuthAction::Auth(session_id) => Self {
+                session_id: Some(session_id),
+            }
+            .into(),
+            AuthAction::Unauth => Self { session_id: None }.into(),
+        }
+    }
+}
+
+#[derive(Properties, PartialEq)]
+struct LoginProps {
+    on_click: Callback<()>,
+}
+
 #[function_component]
-fn Login() -> Html {
+fn Login(LoginProps { on_click }: &LoginProps) -> Html {
+    let on_click = {
+        let on_click = on_click.clone();
+        Callback::from(move |_| on_click.emit(()))
+    };
     html! {
         <div class="login-form">
         <div class="card">
             <h1>{"Welcome to Visions VTT"}</h1>
             <input type="text" name="username" placeholder="username" />
             <input type="password" name="password" placeholder="password" />
+            <button onclick={on_click}>{"Login"}</button>
         </div>
         </div>
     }
@@ -15,8 +56,17 @@ fn Login() -> Html {
 
 #[function_component]
 fn App() -> Html {
-    html! {
-        <Login />
+    let auth_info = use_reducer(AuthInfo::default);
+
+    let on_login = {
+        let auth_info = auth_info.clone();
+        Callback::from(move |_| auth_info.dispatch(AuthAction::Auth("abcdefg".into())))
+    };
+
+    if auth_info.session_id.is_some() {
+        html! { <p>{ "this is just a thing" }</p> }
+    } else {
+        html! { <Login on_click={on_login.clone()} /> }
     }
 }