From 3821c555b1408fa95e3efb3540f45350f41bf5fd Mon Sep 17 00:00:00 2001
From: Andrei Stoica <andrei.stoica.365@gmail.com>
Date: Fri, 6 Dec 2024 21:31:56 -0500
Subject: [PATCH] handle tapping on previously played tiles

---
 lib/main.dart | 35 +++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)

diff --git a/lib/main.dart b/lib/main.dart
index 8f9251f..ad06f84 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -78,7 +78,10 @@ class _MyHomePageState extends State<MyHomePage> {
                     const TextStyle(fontSize: 30, fontWeight: FontWeight.bold),
               )),
               const Spacer(flex: 1),
-              game,
+              TTCGame(
+                turn: turn,
+                onClick: onTurnEnd,
+              ),
               const Spacer(flex: 5),
             ],
           )),
@@ -97,10 +100,10 @@ class TTCGame extends StatefulWidget {
   });
 
   final TTCState turn;
-  final Function? onClick;
   final List<TTCState>? data;
 
-  /// hook to retrieve the turn state of the game
+  /// hook into acction of tapping on square
+  final Function? onClick;
 
   @override
   State<StatefulWidget> createState() => _TTCGameState();
@@ -111,16 +114,24 @@ class _TTCGameState extends State<TTCGame> {
   late List<TTCState> data;
 
   void setCellState(int index) {
-    setState(() {
-      data[index] = turn;
+    switch (data[index]) {
+      case TTCState.empty:
+        setState(() {
+          data[index] = turn;
 
-      turn = switch (turn) {
-        TTCState.x => TTCState.o,
-        TTCState.o => TTCState.x,
-        TTCState.empty => TTCState.empty,
-      };
-    });
-    widget.onClick?.call();
+          turn = switch (turn) {
+            TTCState.x => TTCState.o,
+            TTCState.o => TTCState.x,
+            TTCState.empty => TTCState.empty,
+          };
+        });
+        widget.onClick?.call();
+        break;
+      default:
+        ScaffoldMessenger.of(context)
+          ..clearSnackBars()
+          ..showSnackBar(const SnackBar(content: Text("Invalid Choice")));
+    }
   }
 
   Widget _genCell(int index, TTCState state) => Container(