feat: games with match associations cant be deleted

lib/data/dao/game_dao.dart

@@ -176,4 +176,25 @@ class GameDao extends DatabaseAccessor<AppDatabase> with _$GameDaoMixin {
     final rowsAffected = await query.go();
     return rowsAffected > 0;
   }
+
+  /// Retrieves all games with their respective match counts.
+  /// Returns a list of tuples (Game, matchCount).
+  Future<List<(Game, int)>> getGameUsage() async {
+    final games = await getAllGames();
+
+    final results = <(Game, int)>[];
+
+    for (final game in games) {
+      final matchCount =
+          await (selectOnly(db.matchTable)
+                ..where(db.matchTable.gameId.equals(game.id))
+                ..addColumns([db.matchTable.id.count()]))
+              .map((row) => row.read(db.matchTable.id.count()))
+              .getSingle();
+
+      results.add((game, matchCount ?? 0));
+    }
+
+    return results;
+  }
 }

lib/presentation/views/main_menu/match_view/create_match/choose_game_view.dart

@@ -1,7 +1,9 @@
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 import 'package:tallee/core/adaptive_page_route.dart';
 import 'package:tallee/core/common.dart';
 import 'package:tallee/core/custom_theme.dart';
+import 'package:tallee/data/db/database.dart';
 import 'package:tallee/data/models/game.dart';
 import 'package:tallee/l10n/generated/app_localizations.dart';
 import 'package:tallee/presentation/views/main_menu/match_view/create_match/create_game/create_game_view.dart';
@@ -34,6 +36,10 @@ class ChooseGameView extends StatefulWidget {
 }
 
 class _ChooseGameViewState extends State<ChooseGameView> {
+  late final AppDatabase db;
+
+  late List<(Game, int)> gameCounts = [];
+
   /// Controller for the search bar
   final TextEditingController searchBarController = TextEditingController();
 
@@ -45,6 +51,9 @@ class _ChooseGameViewState extends State<ChooseGameView> {
 
   @override
   void initState() {
+    db = Provider.of<AppDatabase>(context, listen: false);
+    fetchGameCounts();
+
     selectedGameId = widget.initialGameId;
 
     // Start with all games visible
@@ -150,6 +159,7 @@ class _ChooseGameViewState extends State<ChooseGameView> {
                         adaptivePageRoute(
                           builder: (context) => CreateGameView(
                             gameToEdit: game,
+                            canDelete: canDeleteGame(game),
                             onGameChanged: () {
                               widget.onGamesUpdated?.call();
                             },
@@ -209,4 +219,16 @@ class _ChooseGameViewState extends State<ChooseGameView> {
   void _refreshFromSource() {
     _applySearchFilter(searchBarController.text);
   }
+
+  Future<void> fetchGameCounts() async {
+    gameCounts = await db.gameDao.getGameUsage();
+  }
+
+  // A game can only be deleted if there are no matches using it
+  bool canDeleteGame(Game game) {
+    final count = gameCounts
+        .firstWhere((gc) => gc.$1.id == game.id, orElse: () => (game, 0))
+        .$2;
+    return count == 0;
+  }
 }

lib/presentation/views/main_menu/match_view/create_match/create_game/create_game_view.dart

@@ -23,15 +23,18 @@ import 'package:tallee/presentation/widgets/tiles/choose_tile.dart';
 class CreateGameView extends StatefulWidget {
   const CreateGameView({
     super.key,
-    this.gameToEdit,
     required this.onGameChanged,
+    this.gameToEdit,
+    this.canDelete = false,
   });
 
+  /// Callback to invoke when the game is created or edited
+  final VoidCallback onGameChanged;
+
   /// An optional game to prefill the fields
   final Game? gameToEdit;
 
-  /// Callback to invoke when the game is created or edited
-  final VoidCallback onGameChanged;
+  final bool canDelete;
 
   @override
   State<CreateGameView> createState() => _CreateGameViewState();
@@ -41,7 +44,6 @@ class _CreateGameViewState extends State<CreateGameView> {
   /// GlobalKey for ScaffoldMessenger to show snackbars
   final _scaffoldMessengerKey = GlobalKey<ScaffoldMessengerState>();
 
-  /// The database instance for accessing game data.
   late final AppDatabase db;
 
   /// The currently selected ruleset for the game.
@@ -133,13 +135,12 @@ class _CreateGameViewState extends State<CreateGameView> {
         backgroundColor: CustomTheme.backgroundColor,
         appBar: AppBar(
           title: Text(isEditing ? loc.edit_game : loc.create_game),
-          actions: widget.gameToEdit == null
-              ? []
-              : [
-                  IconButton(
-                    icon: const Icon(Icons.delete),
-                    onPressed: () async {
-                      if (widget.gameToEdit != null) {
+          actions: [
+            if (isEditMode())
+              IconButton(
+                icon: const Icon(Icons.delete),
+                onPressed: widget.canDelete
+                    ? () async {
                         showDialog<bool>(
                           context: context,
                           builder: (context) => CustomAlertDialog(
@@ -176,9 +177,9 @@ class _CreateGameViewState extends State<CreateGameView> {
                           }
                         });
                       }
-                    },
-                  ),
-                ],
+                    : null,
+              ),
+          ],
         ),
         body: SafeArea(
           child: Column(