Fix revives; improve dungeon exit flow

src/main/java/emu/grasscutter/game/ability/AbilityManager.java

@@ -7,6 +7,7 @@
 import emu.grasscutter.data.binout.AbilityModifier.AbilityModifierAction;
 import emu.grasscutter.game.ability.actions.*;
 import emu.grasscutter.game.ability.mixins.*;
+import emu.grasscutter.game.entity.EntityAvatar;
 import emu.grasscutter.game.entity.GameEntity;
 import emu.grasscutter.game.player.*;
 import emu.grasscutter.game.props.FightProperty;
@@ -562,6 +563,14 @@ private void handleKillState(AbilityInvokeEntry invoke) throws InvalidProtocolBu
         if (killState.getKilled()) {
             scene.killEntity(entity);
         } else if (!entity.isAlive()) {
+            if (entity instanceof EntityAvatar) {
+                // TODO Should EntityAvatar act on this invocation?
+                // It bugs revival due to resetting HP to max when
+                // the avatar should just stay dead.
+                Grasscutter.getLogger()
+                        .trace("Entity of ID {} is EntityAvatar. Ignoring", invoke.getEntityId());
+                return;
+            }
             entity.setFightProperty(
                     FightProperty.FIGHT_PROP_CUR_HP,
                     entity.getFightProperty(FightProperty.FIGHT_PROP_MAX_HP));

src/main/java/emu/grasscutter/game/dungeons/DungeonSystem.java

@@ -168,13 +168,21 @@ public void exitDungeon(Player player) {
             dungeonManager.unsetTrialTeam(player);
         }
         // clean temp team if it has
-        player.getTeamManager().cleanTemporaryTeam();
+        if (!player.getTeamManager().cleanTemporaryTeam())
+        {
+            // no temp team. Will use real current team, but check
+            // for any dead avatar to prevent switching into them.
+            player.getTeamManager().checkCurrentAvatarIsAlive(null);
+        }
         player.getTowerManager().clearEntry();
         dungeonManager.setTowerDungeon(false);
 
-        // Transfer player back to world
-        player.getWorld().transferPlayerToScene(player, prevScene, prevPos);
-        player.sendPacket(new BasePacket(PacketOpcodes.PlayerQuitDungeonRsp));
+        // Transfer player back to world after a small delay.
+        // This wait is important for avoiding double teleports,
+        // which specifically happen when player quits a dungeon
+        // by teleporting to map waypoints.
+        // From testing, 200ms seem reasonable.
+        player.getWorld().queueTransferPlayerToScene(player, prevScene, prevPos, 200);
     }
 
     public void restartDungeon(Player player) {

src/main/java/emu/grasscutter/game/entity/EntityAvatar.java

@@ -67,6 +67,11 @@ public EntityAvatar(Scene scene, Avatar avatar) {
         }
 
         this.initAbilities();
+
+        // New EntityAvatar instances are created on every scene transition.
+        // Ensure that isDead is properly carried over between scenes.
+        // Otherwise avatars could have 0 HP but not considered dead.
+        this.checkIfDead();
     }
 
     @Override

src/main/java/emu/grasscutter/game/entity/GameEntity.java

@@ -174,13 +174,7 @@ public void damage(float amount, int killerId, ElementType attackType) {
         }
 
         this.lastAttackType = attackType;
-
-        // Check if dead
-        if (this.getFightProperty(FightProperty.FIGHT_PROP_CUR_HP) <= 0f) {
-            this.setFightProperty(FightProperty.FIGHT_PROP_CUR_HP, 0f);
-            this.isDead = true;
-        }
-
+        this.checkIfDead();
         this.runLuaCallbacks(event);
 
         // Packets
@@ -194,6 +188,17 @@ public void damage(float amount, int killerId, ElementType attackType) {
         }
     }
 
+    public void checkIfDead() {
+        if (this.getFightProperties() == null || !hasFightProperty(FightProperty.FIGHT_PROP_CUR_HP)) {
+            return;
+        }
+
+        if (this.getFightProperty(FightProperty.FIGHT_PROP_CUR_HP) <= 0f) {
+            this.setFightProperty(FightProperty.FIGHT_PROP_CUR_HP, 0f);
+            this.isDead = true;
+        }
+    }
+
     /**
      * Runs the Lua callbacks for {@link EntityDamageEvent}.
      *
@@ -333,6 +338,8 @@ public void onDeath(int killerId) {
         if (entityController != null) {
             entityController.onDie(this, getLastAttackType());
         }
+
+        this.isDead = true;
     }
 
     /** Invoked when a global ability value is updated. */

src/main/java/emu/grasscutter/game/player/Player.java

@@ -176,6 +176,7 @@ public class Player implements PlayerHook, FieldFetch {
     @Getter @Setter private Set<Date> moonCardGetTimes;
 
     @Transient @Getter private boolean paused;
+    @Transient @Getter @Setter private Future<?> queuedTeleport;
     @Transient @Getter @Setter private int enterSceneToken;
     @Transient @Getter @Setter private SceneLoadState sceneLoadState = SceneLoadState.NONE;
     @Transient private boolean hasSentLoginPackets;

src/main/java/emu/grasscutter/game/player/TeamManager.java

@@ -425,6 +425,30 @@ public void updateTeamEntities(BasePacket responsePacket) {
             this.getPlayer().sendPacket(responsePacket);
         }
 
+        // Ensure new selected character index is alive.
+        // If not, change to another alive one or revive.
+        checkCurrentAvatarIsAlive(currentEntity);
+    }
+
+    public void checkCurrentAvatarIsAlive(EntityAvatar currentEntity) {
+        if (currentEntity == null) {
+            currentEntity = this.getCurrentAvatarEntity();
+        }
+
+        // Ensure currently selected character is still alive
+        if (!this.getActiveTeam().get(this.currentCharacterIndex).isAlive()) {
+            // Character died in a dungeon challenge...
+            int replaceIndex = getDeadAvatarReplacement();
+            if (0 <= replaceIndex && replaceIndex < this.getActiveTeam().size()) {
+                this.currentCharacterIndex = replaceIndex;
+            } else {
+                // Team wiped in dungeon...
+                // Revive and change to first avatar.
+                this.currentCharacterIndex = 0;
+                this.reviveAvatar(this.getCurrentAvatarEntity().getAvatar());
+            }
+        }
+
         // Check if character changed
         var newAvatarEntity = this.getCurrentAvatarEntity();
         if (currentEntity != null && newAvatarEntity != null && currentEntity != newAvatarEntity) {
@@ -700,15 +724,16 @@ public void useTemporaryTeam(int index) {
         this.updateTeamEntities(null);
     }
 
-    public void cleanTemporaryTeam() {
+    public boolean cleanTemporaryTeam() {
         // check if using temporary team
         if (useTemporarilyTeamIndex < 0) {
-            return;
+            return false;
         }
 
         this.useTemporarilyTeamIndex = -1;
         this.temporaryTeam = null;
         this.updateTeamEntities(null);
+        return true;
     }
 
     public synchronized void setCurrentTeam(int teamId) {
@@ -810,38 +835,41 @@ public void onAvatarDie(long dieGuid) {
             // TODO: Perhaps find a way to get vanilla experience?
             this.getPlayer().sendPacket(new PacketWorldPlayerDieNotify(dieType, killedBy));
         } else {
-            // Replacement avatar
-            EntityAvatar replacement = null;
-            int replaceIndex = -1;
-
-            for (int i = 0; i < this.getActiveTeam().size(); i++) {
-                EntityAvatar entity = this.getActiveTeam().get(i);
-                if (entity.isAlive()) {
-                    replaceIndex = i;
-                    replacement = entity;
-                    break;
-                }
-            }
-
-            if (replacement == null) {
+            // Find replacement avatar
+            int replaceIndex = getDeadAvatarReplacement();
+            if (0 <= replaceIndex && replaceIndex < this.getActiveTeam().size()) {
+                // Set index and spawn replacement member
+                this.setCurrentCharacterIndex(replaceIndex);
+                this.getPlayer().getScene().addEntity(this.getActiveTeam().get(replaceIndex));
+            } else {
                 // No more living team members...
                 this.getPlayer().sendPacket(new PacketWorldPlayerDieNotify(dieType, killedBy));
                 // Invoke player team death event.
                 PlayerTeamDeathEvent event =
                         new PlayerTeamDeathEvent(
                                 this.getPlayer(), this.getActiveTeam().get(this.getCurrentCharacterIndex()));
                 event.call();
-            } else {
-                // Set index and spawn replacement member
-                this.setCurrentCharacterIndex(replaceIndex);
-                this.getPlayer().getScene().addEntity(replacement);
             }
         }
 
         // Response packet
         this.getPlayer().sendPacket(new PacketAvatarDieAnimationEndRsp(deadAvatar.getId(), 0));
     }
 
+    public int getDeadAvatarReplacement() {
+        int replaceIndex = -1;
+
+        for (int i = 0; i < this.getActiveTeam().size(); i++) {
+            EntityAvatar entity = this.getActiveTeam().get(i);
+            if (entity.isAlive()) {
+                replaceIndex = i;
+                break;
+            }
+        }
+
+        return replaceIndex;
+    }
+
     public boolean reviveAvatar(Avatar avatar) {
         for (EntityAvatar entity : this.getActiveTeam()) {
             if (entity.getAvatar() == avatar) {

src/main/java/emu/grasscutter/game/world/World.java

@@ -2,6 +2,7 @@
 
 import static emu.grasscutter.server.event.player.PlayerTeleportEvent.TeleportType.SCRIPT;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.data.GameData;
 import emu.grasscutter.data.excels.dungeon.DungeonData;
 import emu.grasscutter.game.entity.*;
@@ -19,8 +20,10 @@
 import emu.grasscutter.server.game.GameServer;
 import emu.grasscutter.server.packet.send.*;
 import emu.grasscutter.utils.ConversionUtils;
+import io.netty.util.concurrent.FastThreadLocalThread;
 import it.unimi.dsi.fastutil.ints.*;
 import java.util.*;
+import java.util.concurrent.*;
 import lombok.*;
 import org.jetbrains.annotations.NotNull;
 
@@ -43,6 +46,16 @@ public class World implements Iterable<Player> {
     @Getter private boolean isPaused = false;
     @Getter private long currentWorldTime;
 
+    private static final ExecutorService eventExecutor =
+            new ThreadPoolExecutor(
+                    4,
+                    4,
+                    60,
+                    TimeUnit.SECONDS,
+                    new LinkedBlockingDeque<>(1000),
+                    FastThreadLocalThread::new,
+                    new ThreadPoolExecutor.AbortPolicy());
+
     public World(Player player) {
         this(player, false);
     }
@@ -311,6 +324,17 @@ public void save() {
         this.getScenes().values().forEach(Scene::saveGroups);
     }
 
+    public void queueTransferPlayerToScene(Player player, int sceneId, Position pos, int delayMs) {
+        player.setQueuedTeleport(eventExecutor.submit(() -> {
+            try {
+                Thread.sleep(delayMs);
+                transferPlayerToScene(player, sceneId, pos);
+            } catch (InterruptedException e) {
+                Grasscutter.getLogger().trace("queueTransferPlayerToScene: teleport to scene {} is interrupted", sceneId);
+            }
+        }));
+    }
+
     public boolean transferPlayerToScene(Player player, int sceneId, Position pos) {
         return this.transferPlayerToScene(player, sceneId, TeleportType.INTERNAL, null, pos);
     }
@@ -381,6 +405,16 @@ public boolean transferPlayerToScene(
     }
 
     public boolean transferPlayerToScene(Player player, TeleportProperties teleportProperties) {
+        // If a queued teleport already exists, cancel it. This prevents the player from
+        // becoming stranded in a dungeon due to quitting it by teleporting to a map waypoint.
+        synchronized (player) {
+            var queuedTeleport = player.getQueuedTeleport();
+            if (queuedTeleport != null) {
+                player.setQueuedTeleport(null);
+                queuedTeleport.cancel(true);
+            }
+        }
+
         // Check if the teleport properties are valid.
         if (teleportProperties.getTeleportTo() == null)
             teleportProperties.setTeleportTo(player.getPosition());

src/main/java/emu/grasscutter/server/packet/recv/HandlerDungeonDieOptionReq.java

@@ -0,0 +1,22 @@
+package emu.grasscutter.server.packet.recv;
+
+import emu.grasscutter.net.packet.*;
+import emu.grasscutter.net.proto.DungeonDieOptionReqOuterClass.DungeonDieOptionReq;
+import emu.grasscutter.net.proto.PlayerDieOptionOuterClass.PlayerDieOption;
+import emu.grasscutter.server.game.GameSession;
+
+@Opcodes(PacketOpcodes.DungeonDieOptionReq)
+public class HandlerDungeonDieOptionReq extends PacketHandler {
+
+    @Override
+    public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
+        DungeonDieOptionReq req = DungeonDieOptionReq.parseFrom(payload);
+        var dieOption = req.getDieOption();
+        // TODO Handle other die options
+        if (req.getIsQuitImmediately()) {
+            session.getPlayer().getServer().getDungeonSystem().exitDungeon(session.getPlayer());
+        }
+        session.getPlayer().sendPacket(new BasePacket(PacketOpcodes.DungeonDieOptionRsp));
+    }
+}
+