feat(ui): add main menu navbar and join game functionality

knockoutwhistweb/app/controllers/MainMenuController.scala

@@ -21,7 +21,7 @@ class MainMenuController @Inject()(
 
   // Pass the request-handling function directly to authAction (no nested Action)
   def mainMenu(): Action[AnyContent] = authAction { implicit request: AuthenticatedRequest[AnyContent] =>
-    Ok("Main Menu for user: " + request.user.name)
+    Ok(views.html.mainmenu.navbar(Some(request.user)))
   }
 
   def index(): Action[AnyContent] = authAction { implicit request: AuthenticatedRequest[AnyContent] =>
@@ -36,6 +36,22 @@ class MainMenuController @Inject()(
     )
     Redirect(routes.IngameController.game(gameLobby.id))
   }
+  
+  def joinGame(): Action[AnyContent] = authAction { implicit request: AuthenticatedRequest[AnyContent] =>
+    val postData = request.body.asFormUrlEncoded
+    if (postData.isDefined) {
+      val gameId = postData.get.get("gameId").flatMap(_.headOption).getOrElse("")
+      val game = podManager.getGame(gameId)
+      game match {
+        case Some(g) =>
+          Redirect(routes.IngameController.joinGame(gameId))
+        case None =>
+          NotFound("Game not found")
+      }
+    } else {
+      BadRequest("Invalid form submission")
+    }
+  }
 
   def rules(): Action[AnyContent] = {
     Action { implicit request =>

knockoutwhistweb/app/controllers/UserController.scala

@@ -64,7 +64,7 @@ class UserController @Inject()(
     if (sessionCookie.isDefined) {
       sessionManager.invalidateSession(sessionCookie.get.value)
     }
-    NoContent.discardingCookies(DiscardingCookie("sessionId"))
+    Redirect(routes.UserController.login()).discardingCookies(DiscardingCookie("sessionId"))
   }
 
 }

knockoutwhistweb/app/logic/game/GameLobby.scala

@@ -70,6 +70,9 @@ class GameLobby private(
     if (!sessionOpt.get.host) {
       throw new NotHostException("Only the host can start the game!")
     }
+    if (logic.getCurrentState != Lobby) {
+      throw new IllegalStateException("The game has already started!")
+    }
     val playerNamesList = ListBuffer[AbstractPlayer]()
     users.values.foreach { player =>
       playerNamesList += PlayerFactory.createPlayer(player.name, player.id, HUMAN)

knockoutwhistweb/app/views/ingame/ingame.scala.html

@@ -17,7 +17,7 @@
             @if(logic.getCurrentTrick.get.firstCard.isDefined) {
                 @util.WebUIUtils.cardtoImage(logic.getCurrentTrick.get.firstCard.get)
             } else {
-                @views.html.render.card.apply("../../../public/images/cards/1B.png")("Blank Card")
+                @views.html.render.card.apply("images/cards/1B.png")("Blank Card")
             }
         </div>
     </div>

knockoutwhistweb/app/views/mainmenu/navbar.scala.html

@@ -0,0 +1,56 @@
+@(user: Option[model.users.User])
+@main("Knockout Whist - Main Menu") {
+    <nav class="navbar navbar-expand-lg bg-body-tertiary">
+        <div class="container-fluid">
+            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navBar" aria-controls="navBar" aria-expanded="false" aria-label="Toggle navigation">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="navBar">
+                <a class="navbar-brand" href="@routes.MainMenuController.mainMenu()">KnockOutWhist</a>
+                <div class="navbar-nav me-auto mb-2 mb-lg-0">
+                    <ul class="navbar-nav mb-2 mb-lg-0">
+                        @if(user.isDefined) {
+                            <li class="nav-item">
+                                <a class="nav-link active" aria-current="page" href="#">Create Game</a>
+                            </li>
+                            <li class="nav-item">
+                                <a class="nav-link disabled" aria-disabled="true">Lobbies</a>
+                            </li>
+                        }
+                        <li class="nav-item">
+                            <a class="nav-link active" href="@routes.MainMenuController.rules()">Rules</a>
+                        </li>
+                    </ul>
+                    <form class="navbar-nav me-auto mb-2 mb-lg-0" method="post" action="@routes.MainMenuController.joinGame()">
+                        <input class="form-control me-2" type="text" placeholder="Enter GameCode" name="gameId" aria-label="Join Game"/>
+                        <button class="btn btn-outline-success" type="submit">Join</button>
+                    </form>
+                </div>
+
+                @* Right side: profile dropdown if logged in, otherwise Login / Sign Up buttons *@
+                @if(user.isDefined) {
+                    <ul class="navbar-nav ms-auto mb-2 mb-lg-0">
+                        <li class="nav-item dropdown">
+                            <a class="nav-link dropdown-toggle d-flex align-items-center" href="#" id="profileDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+                                <img src="@routes.Assets.versioned("images/profile.png")" alt="Profile" class="rounded-circle" width="30" height="30" />
+                                <span class="ms-2">@user.get.name</span>
+                            </a>
+                            <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="profileDropdown">
+                                <li><a class="dropdown-item disabled" href="#" tabindex="-1" aria-disabled="true">Stats</a></li>
+                                <li><a class="dropdown-item disabled" href="#" tabindex="-1" aria-disabled="true">Settings</a></li>
+                                <li><hr class="dropdown-divider"></li>
+                                <li><a class="dropdown-item" href="@routes.UserController.logout()">Logout</a></li>
+                            </ul>
+                        </li>
+                    </ul>
+                } else {
+                    <div class="d-flex ms-auto">
+                        <a class="btn btn-outline-primary me-2" href="@routes.UserController.login()">Login</a>
+                        <a class="btn btn-primary" href="@routes.UserController.login()">Sign Up</a>
+                    </div>
+                }
+
+            </div>
+        </div>
+    </nav>
+}

knockoutwhistweb/app/views/mainmenu/rules.scala.html

@@ -1,7 +1,7 @@
 @()
 
 @main("Rules") {
-<div id="rules">
+<div id="rules" class="game-field game-field-background">
     <table>
         <caption>Rules Overview and Equipment</caption>
         <thead>