implement winner methods

lib/data/dao/group_dao.dart

@@ -231,4 +231,44 @@ class GroupDao extends DatabaseAccessor<AppDatabase> with _$GroupDaoMixin {
     final rowsAffected = await query.go();
     return rowsAffected > 0;
   }
+
+  /// Replaces all players in a group with the provided list of players.
+  /// Removes all existing players from the group and adds the new players.
+  /// Also adds any new players to the player table if they don't exist.
+  Future<void> replaceGroupPlayers({
+    required String groupId,
+    required List<Player> newPlayers,
+  }) async {
+    await db.transaction(() async {
+      // Remove all existing players from the group
+      final deleteQuery = delete(db.playerGroupTable)
+        ..where((p) => p.groupId.equals(groupId));
+      await deleteQuery.go();
+
+      // Add new players to the player table if they don't exist
+      await Future.wait(
+        newPlayers.map((player) async {
+          if (!await db.playerDao.playerExists(playerId: player.id)) {
+            await db.playerDao.addPlayer(player: player);
+          }
+        }),
+      );
+
+      // Add the new players to the group
+      await db.batch(
+        (b) => b.insertAll(
+          db.playerGroupTable,
+          newPlayers
+              .map(
+                (player) => PlayerGroupTableCompanion.insert(
+                  playerId: player.id,
+                  groupId: groupId,
+                ),
+              )
+              .toList(),
+          mode: InsertMode.insertOrReplace,
+        ),
+      );
+    });
+  }
 }

lib/data/dao/match_dao.dart

@@ -355,39 +355,119 @@ class MatchDao extends DatabaseAccessor<AppDatabase> with _$MatchDaoMixin {
     return rowsAffected > 0;
   }
 
+  /// Replaces all players in a match with the provided list of players.
+  /// Removes all existing players from the match and adds the new players.
+  /// Also adds any new players to the player table if they don't exist.
+  Future<void> replaceMatchPlayers({
+    required String matchId,
+    required List<Player> newPlayers,
+  }) async {
+    await db.transaction(() async {
+      // Remove all existing players from the match
+      final deleteQuery = delete(db.playerMatchTable)
+        ..where((p) => p.matchId.equals(matchId));
+      await deleteQuery.go();
+
+      // Add new players to the player table if they don't exist
+      await Future.wait(
+        newPlayers.map((player) async {
+          if (!await db.playerDao.playerExists(playerId: player.id)) {
+            await db.playerDao.addPlayer(player: player);
+          }
+        }),
+      );
+
+      // Add the new players to the match
+      await Future.wait(
+        newPlayers.map((player) => db.playerMatchDao.addPlayerToMatch(
+          matchId: matchId,
+          playerId: player.id,
+        )),
+      );
+    });
+  }
+
   // ============================================================
-  // TEMPORARY: Winner methods - these are stubs and do not persist data
+  // Winner methods - handle winner logic via player scores
-  // TODO: Implement proper winner handling
   // ============================================================
 
-  /// TEMPORARY: Checks if a match has a winner.
+  /// Checks if a match has a winner.
-  /// Currently returns true if the match has any players.
+  /// Returns true if any player in the match has their score set to 1.
   Future<bool> hasWinner({required String matchId}) async {
     final players = await db.playerMatchDao.getPlayersOfMatch(matchId: matchId) ?? [];
-    return players.isNotEmpty;
+
+    for (final player in players) {
+      final score = await db.playerMatchDao.getPlayerScore(
+        matchId: matchId,
+        playerId: player.id,
+      );
+      if (score == 1) {
+        return true;
+      }
+    }
+    return false;
   }
 
-  /// TEMPORARY: Gets the winner of a match.
+  /// Gets the winner of a match.
-  /// Currently returns the first player in the match's player list.
+  /// Returns the player with score 1, or null if no winner is set.
   Future<Player?> getWinner({required String matchId}) async {
     final players = await db.playerMatchDao.getPlayersOfMatch(matchId: matchId) ?? [];
-    return players.isNotEmpty ? players.first : null;
+
+    for (final player in players) {
+      final score = await db.playerMatchDao.getPlayerScore(
+        matchId: matchId,
+        playerId: player.id,
+      );
+      if (score == 1) {
+        return player;
+      }
+    }
+    return null;
   }
 
-  /// TEMPORARY: Sets the winner of a match.
+  /// Sets the winner of a match.
-  /// Currently does nothing - winner is not persisted.
+  /// Sets all players' scores to 0, then sets the specified player's score to 1.
+  /// Returns `true` if the operation was successful, otherwise `false`.
   Future<bool> setWinner({
     required String matchId,
     required String winnerId,
   }) async {
-    // TODO: Implement winner persistence
+    await db.transaction(() async {
+      final players = await db.playerMatchDao.getPlayersOfMatch(matchId: matchId) ?? [];
+
+      // Set all players' scores to 0
+      for (final player in players) {
+        await db.playerMatchDao.updatePlayerScore(
+          matchId: matchId,
+          playerId: player.id,
+          newScore: 0,
+        );
+      }
+
+      // Set the winner's score to 1
+      await db.playerMatchDao.updatePlayerScore(
+        matchId: matchId,
+        playerId: winnerId,
+        newScore: 1,
+      );
+    });
     return true;
   }
 
-  /// TEMPORARY: Removes the winner of a match.
+  /// Removes the winner of a match.
-  /// Currently does nothing - winner is not persisted.
+  /// Sets the current winner's score to 0 (no winner).
+  /// Returns `true` if a winner was removed, otherwise `false`.
   Future<bool> removeWinner({required String matchId}) async {
-    // TODO: Implement winner persistence
+    final winner = await getWinner(matchId: matchId);
-    return true;
+    if (winner == null) {
+      return false;
+    }
+
+    final success = await db.playerMatchDao.updatePlayerScore(
+      matchId: matchId,
+      playerId: winner.id,
+      newScore: 0,
+    );
+    return success;
   }
 }

test/db_tests/relationships/player_group_test.dart

@@ -308,5 +308,35 @@ void main() {
       );
       expect(secondRemoval, false);
     });
+
+    // Verifies that replaceGroupPlayers removes all existing players and replaces with new list.
+    test('replaceGroupPlayers replaces all group members correctly', () async {
+      // Create initial group with 3 players
+      await database.groupDao.addGroup(group: testGroup);
+
+      // Verify initial members
+      var groupMembers = await database.groupDao.getGroupById(
+        groupId: testGroup.id,
+      );
+      expect(groupMembers.members.length, 3);
+
+      // Replace with new list containing 2 different players
+      final newPlayersList = [testPlayer3, testPlayer4];
+      await database.groupDao.replaceGroupPlayers(
+        groupId: testGroup.id,
+        newPlayers: newPlayersList,
+      );
+
+      // Get updated group and verify members
+      groupMembers = await database.groupDao.getGroupById(
+        groupId: testGroup.id,
+      );
+
+      expect(groupMembers.members.length, 2);
+      expect(groupMembers.members.any((p) => p.id == testPlayer3.id), true);
+      expect(groupMembers.members.any((p) => p.id == testPlayer4.id), true);
+      expect(groupMembers.members.any((p) => p.id == testPlayer1.id), false);
+      expect(groupMembers.members.any((p) => p.id == testPlayer2.id), false);
+    });
   });
 }

test/db_tests/relationships/player_match_test.dart

@@ -884,5 +884,36 @@ void main() {
       expect(playersInTeam.length, 1);
       expect(playersInTeam[0].id, testPlayer2.id);
     });
+
+    // Verifies that replaceMatchPlayers removes all existing players and replaces with new list.
+    test('replaceMatchPlayers replaces all match players correctly', () async {
+      // Create initial match with 3 players
+      await database.matchDao.addMatch(match: testMatchOnlyPlayers);
+
+      // Verify initial players
+      var matchPlayers = await database.matchDao.getMatchById(
+        matchId: testMatchOnlyPlayers.id,
+      );
+      expect(matchPlayers.players.length, 3);
+
+      // Replace with new list containing 2 different players
+      final newPlayersList = [testPlayer1, testPlayer2];
+      await database.matchDao.replaceMatchPlayers(
+        matchId: testMatchOnlyPlayers.id,
+        newPlayers: newPlayersList,
+      );
+
+      // Get updated match and verify players
+      matchPlayers = await database.matchDao.getMatchById(
+        matchId: testMatchOnlyPlayers.id,
+      );
+
+      expect(matchPlayers.players.length, 2);
+      expect(matchPlayers.players.any((p) => p.id == testPlayer1.id), true);
+      expect(matchPlayers.players.any((p) => p.id == testPlayer2.id), true);
+      expect(matchPlayers.players.any((p) => p.id == testPlayer4.id), false);
+      expect(matchPlayers.players.any((p) => p.id == testPlayer5.id), false);
+      expect(matchPlayers.players.any((p) => p.id == testPlayer6.id), false);
+    });
   });
 }