[Server] Fix tournament stuck-round and sub-game start paths

Gate the host-only start on the hub object so match sub-games can
start, advance the round when a drop decides the last pairing (and on
late results), settle disconnected pairings instead of stalling, and
decide exhausted series by game wins.

libcockatrice_network/libcockatrice/network/server/remote/game/server_game.cpp

@@ -369,7 +369,8 @@ void Server_Game::doStartGameIfReady(bool forceStartGame)
     // Tournament hubs must be host-started and can't lock in a partially filled
     // bracket: a mere "everyone current is ready" must not start a 1-player or
     // undersized tournament. startTournament() additionally enforces 2+ players.
-    if (isTournament && !forceStartGame) {
+    // Match sub-games carry isTournament too, so gate on the hub object only.
+    if (tournament && !forceStartGame) {
         return;
     }
 
@@ -633,7 +634,7 @@ void Server_Game::removeParticipant(Server_AbstractParticipant *participant, Eve
     if (tournament && !tournamentParentGame && !spectator) {
         const int leavingPlayerId = participant->getPlayerId();
         GameEventStorage tournGes;
-        tournament->dropPlayer(leavingPlayerId);
+        tournament->dropPlayer(leavingPlayerId, tournGes);
         tournament->broadcastTournamentState(tournGes);
         tournGes.sendToGame(this);
     }

libcockatrice_network/libcockatrice/network/server/remote/game/server_tournament.cpp

@@ -57,7 +57,8 @@ void Server_Tournament::removePlayer(int playerId)
     byeGivenPlayers.remove(playerId);
 }
 
-void Server_Tournament::dropPlayer(int playerId)
+void Server_Tournament::dropPlayer(int playerId, GameEventStorage &ges)
+{
     {
         QMutexLocker locker(&tournamentMutex);
         if (!players.contains(playerId)) {
@@ -89,6 +90,9 @@ void Server_Tournament::dropPlayer(int playerId)
             allPreviousPairings.append(qMakePair(pairing.player1Id, pairing.player2Id));
         }
     }
+    // A drop can decide the last open pairing of the round; advance when complete.
+    checkAndAdvanceRound(ges);
+}
 
 void Server_Tournament::startTournament()
 {
@@ -332,6 +336,7 @@ void Server_Tournament::createMatchGame(int player1Id, int player2Id)
     QString deck2Native;
     int round = 0;
     int gameNumber = 1;
+    bool settledWithoutGame = false;
     {
         QMutexLocker locker(&tournamentMutex);
         player1Name = players.value(player1Id).playerName;
@@ -363,11 +368,42 @@ void Server_Tournament::createMatchGame(int player1Id, int player2Id)
 
         // Bail out if either participant is no longer connected: a match game with
         // zero or one connected player can never finish and would stall the round.
-        if (!matchGameFactory->getUserInterface(player1Name) || !matchGameFactory->getUserInterface(player2Name)) {
+        // Settle the pairing like dropPlayer does so the round can still advance.
+        auto *ui1 = matchGameFactory->getUserInterface(player1Name);
+        auto *ui2 = matchGameFactory->getUserInterface(player2Name);
+        if (!ui1 || !ui2) {
             qCWarning(TournamentLog) << "Skipping match creation: a player in pairing" << player1Id << player2Id
                                      << "is no longer connected";
-            return;
+            for (auto &pairing : currentPairings) {
+                if (pairing.player1Id == player1Id && pairing.player2Id == player2Id && pairing.winnerId == -2) {
+                    if (ui1 && !ui2) {
+                        pairing.winnerId = player1Id;
+                        players[player1Id].wins += 1;
+                        players[player2Id].losses += 1;
+                    } else if (ui2 && !ui1) {
+                        pairing.winnerId = player2Id;
+                        players[player2Id].wins += 1;
+                        players[player1Id].losses += 1;
+                    } else {
+                        pairing.winnerId = -1;
+                        players[player1Id].draws += 1;
+                        players[player2Id].draws += 1;
                     }
+                    allPreviousPairings.append(qMakePair(player1Id, player2Id));
+                    break;
+                }
+            }
+            settledWithoutGame = true;
+        }
+    }
+
+    if (settledWithoutGame) {
+        GameEventStorage ges;
+        broadcastTournamentState(ges);
+        checkAndAdvanceRound(ges);
+        broadcastTournamentState(ges);
+        ges.sendToGame(parentGame);
+        return;
     }
 
     // Create a sub-game for this match via the factory, copying the real
@@ -543,10 +579,14 @@ bool Server_Tournament::recordMatchResultByGameId(int gameId, int winnerId, Game
         }
 
         // If the match is already decided, ignore further sub-game results
+        // but still check whether the round can advance (e.g. a drop decided
+        // the last pairing and this late result is the first chance to notice).
         if (pairingPtr->winnerId != -2) {
-            return true;
-        }
-
+            broadcastTournamentState(ges);
+            // Fall through to checkAndAdvanceRound below.
+            matchDecided = true;
+            seriesContinues = false;
+        } else {
             // Increment per-match wins
             if (winnerId == pairingPtr->player1Id) {
                 pairingPtr->player1MatchWins += 1;
@@ -560,11 +600,13 @@ bool Server_Tournament::recordMatchResultByGameId(int gameId, int winnerId, Game
             const int gamesPlayed = pairingPtr->matchGameIds.size();
             const int gamesNeeded = static_cast<int>(gamesPerMatch / 2 + 1);
             const int gamesRemaining = static_cast<int>(gamesPerMatch) - gamesPlayed;
-        matchDecided = (pairingPtr->player1MatchWins >= gamesNeeded) || (pairingPtr->player2MatchWins >= gamesNeeded);
-        if (!matchDecided) {
-            // Series exhausted without a strict-majority winner (e.g. a drawn Bo3
-            // leaves it 1-1): record the match as a draw so the round always advances.
-            matchDecided = (gamesRemaining <= 0) && (pairingPtr->player1MatchWins == pairingPtr->player2MatchWins);
+            matchDecided =
+                (pairingPtr->player1MatchWins >= gamesNeeded) || (pairingPtr->player2MatchWins >= gamesNeeded);
+            if (!matchDecided && gamesRemaining <= 0) {
+                // Series exhausted: draws can leave the wins unequal without either
+                // side reaching a majority (e.g. Bo3 going win/draw/draw for 1-0).
+                // Decide by game wins, draw only on a tie, so the round advances.
+                matchDecided = true;
             }
 
             if (matchDecided) {
@@ -574,6 +616,12 @@ bool Server_Tournament::recordMatchResultByGameId(int gameId, int winnerId, Game
                     matchWinnerId = pairingPtr->player1Id;
                 } else if (pairingPtr->player2MatchWins >= gamesNeeded) {
                     matchWinnerId = pairingPtr->player2Id;
+                } else if (gamesRemaining <= 0) {
+                    if (pairingPtr->player1MatchWins > pairingPtr->player2MatchWins) {
+                        matchWinnerId = pairingPtr->player1Id;
+                    } else if (pairingPtr->player2MatchWins > pairingPtr->player1MatchWins) {
+                        matchWinnerId = pairingPtr->player2Id;
+                    }
                 }
                 // Otherwise the series was exhausted evenly — matchWinnerId stays -1 (a draw).
 
@@ -602,6 +650,7 @@ bool Server_Tournament::recordMatchResultByGameId(int gameId, int winnerId, Game
             }
 
             broadcastTournamentState(ges);
+        } // else (undecided pairing)
     }
 
     if (seriesContinues) {

libcockatrice_network/libcockatrice/network/server/remote/game/server_tournament.h

@@ -30,7 +30,7 @@ public:
     void removePlayer(int playerId);
     // Marks an already-starting/started tournament player as dropped: they stop
     // being paired and their outstanding unstarted match is awarded as a loss.
-    void dropPlayer(int playerId);
+    void dropPlayer(int playerId, GameEventStorage &ges);
     void startTournament();
     void advanceRound(GameEventStorage &ges);
     void recordMatchResult(int playerId1, int playerId2, int winnerId, GameEventStorage &ges);