From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sat, 15 May 2021 10:04:43 -0700
Subject: [PATCH] Expand PlayerGameModeChangeEvent


diff --git a/src/main/java/net/minecraft/server/commands/DefaultGameModeCommands.java b/src/main/java/net/minecraft/server/commands/DefaultGameModeCommands.java
index b95a979f8f58f43e0becedcd843ff8bb992eb455..a046a0b1519806ff3d987e6402f152b60a3a6f4c 100644
--- a/src/main/java/net/minecraft/server/commands/DefaultGameModeCommands.java
+++ b/src/main/java/net/minecraft/server/commands/DefaultGameModeCommands.java
@@ -28,9 +28,13 @@ public class DefaultGameModeCommands {
         GameType gameType = minecraftServer.getForcedGameType();
         if (gameType != null) {
             for (ServerPlayer serverPlayer : minecraftServer.getPlayerList().getPlayers()) {
-                if (serverPlayer.setGameMode(gameType)) {
-                    i++;
+                // Paper start - Expand PlayerGameModeChangeEvent
+                org.bukkit.event.player.PlayerGameModeChangeEvent event = serverPlayer.setGameMode(gameType, org.bukkit.event.player.PlayerGameModeChangeEvent.Cause.DEFAULT_GAMEMODE, net.kyori.adventure.text.Component.empty());
+                if (event != null && event.isCancelled()) {
+                    source.sendSuccess(() -> io.papermc.paper.adventure.PaperAdventure.asVanilla(event.cancelMessage()), false);
                 }
+                // Paper end - Expand PlayerGameModeChangeEvent
+                    i++;
             }
         }
 
diff --git a/src/main/java/net/minecraft/server/commands/GameModeCommand.java b/src/main/java/net/minecraft/server/commands/GameModeCommand.java
index 7f09119bc7d661e08a960dd2bd46006efe752d3e..d1da3600dc07107309b20ebe6e7c0c4da0e8de76 100644
--- a/src/main/java/net/minecraft/server/commands/GameModeCommand.java
+++ b/src/main/java/net/minecraft/server/commands/GameModeCommand.java
@@ -60,9 +60,14 @@ public class GameModeCommand {
         int i = 0;
 
         for (ServerPlayer serverPlayer : targets) {
-            if (serverPlayer.setGameMode(gameMode)) {
+            // Paper start - Expand PlayerGameModeChangeEvent
+            org.bukkit.event.player.PlayerGameModeChangeEvent event = serverPlayer.setGameMode(gameMode, org.bukkit.event.player.PlayerGameModeChangeEvent.Cause.COMMAND, net.kyori.adventure.text.Component.empty());
+            if (event != null && !event.isCancelled()) {
                 logGamemodeChange(context.getSource(), serverPlayer, gameMode);
                 i++;
+            } else if (event != null && event.cancelMessage() != null) {
+                context.getSource().sendSuccess(() -> io.papermc.paper.adventure.PaperAdventure.asVanilla(event.cancelMessage()), true);
+                // Paper end - Expand PlayerGameModeChangeEvent
             }
         }
 
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 2db78d991ef0595a0d8806414a959479e289c0fc..50c6b668a8e915081007dfd9c9fc1aae179e16c9 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -2024,8 +2024,16 @@ public class ServerPlayer extends Player {
     }
 
     public boolean setGameMode(GameType gameMode) {
-        if (!this.gameMode.changeGameModeForPlayer(gameMode)) {
-            return false;
+        // Paper start - Expand PlayerGameModeChangeEvent
+        org.bukkit.event.player.PlayerGameModeChangeEvent event = this.setGameMode(gameMode, org.bukkit.event.player.PlayerGameModeChangeEvent.Cause.UNKNOWN, null);
+        return event == null ? false : event.isCancelled();
+    }
+    @Nullable
+    public org.bukkit.event.player.PlayerGameModeChangeEvent setGameMode(GameType gameMode, org.bukkit.event.player.PlayerGameModeChangeEvent.Cause cause, @Nullable net.kyori.adventure.text.Component message) {
+        org.bukkit.event.player.PlayerGameModeChangeEvent event = this.gameMode.changeGameModeForPlayer(gameMode, cause, message);
+        if (event == null || event.isCancelled()) {
+            return null;
+            // Paper end - Expand PlayerGameModeChangeEvent
         } else {
             this.connection.send(new ClientboundGameEventPacket(ClientboundGameEventPacket.CHANGE_GAME_MODE, (float) gameMode.getId()));
             if (gameMode == GameType.SPECTATOR) {
@@ -2037,7 +2045,7 @@ public class ServerPlayer extends Player {
 
             this.onUpdateAbilities();
             this.updateEffectVisibility();
-            return true;
+            return event; // Paper - Expand PlayerGameModeChangeEvent
         }
     }
 
@@ -2447,6 +2455,16 @@ public class ServerPlayer extends Player {
     }
 
     public void loadGameTypes(@Nullable CompoundTag nbt) {
+        // Paper start - Expand PlayerGameModeChangeEvent
+        if (this.server.getForcedGameType() != null && this.server.getForcedGameType() != ServerPlayer.readPlayerMode(nbt, "playerGameType")) {
+            if (new org.bukkit.event.player.PlayerGameModeChangeEvent(this.getBukkitEntity(), org.bukkit.GameMode.getByValue(this.server.getDefaultGameType().getId()), org.bukkit.event.player.PlayerGameModeChangeEvent.Cause.DEFAULT_GAMEMODE, null).callEvent()) {
+                this.gameMode.setGameModeForPlayer(this.server.getForcedGameType(), GameType.DEFAULT_MODE);
+            } else {
+                this.gameMode.setGameModeForPlayer(ServerPlayer.readPlayerMode(nbt,"playerGameType"), ServerPlayer.readPlayerMode(nbt, "previousPlayerGameType"));
+            }
+            return;
+        }
+        // Paper end - Expand PlayerGameModeChangeEvent
         this.gameMode.setGameModeForPlayer(this.calculateGameModeForNewPlayer(ServerPlayer.readPlayerMode(nbt, "playerGameType")), ServerPlayer.readPlayerMode(nbt, "previousPlayerGameType"));
     }
 
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
index 486d9c4dbe3ee23198eba7f34ea8b5f4e9048c0b..f080322bc766361b9d2d8b1214c3dff1c3df9ae8 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -72,14 +72,21 @@ public class ServerPlayerGameMode {
     }
 
     public boolean changeGameModeForPlayer(GameType gameMode) {
+        // Paper start - Expand PlayerGameModeChangeEvent
+        PlayerGameModeChangeEvent event = this.changeGameModeForPlayer(gameMode, org.bukkit.event.player.PlayerGameModeChangeEvent.Cause.UNKNOWN, null);
+        return event != null && event.isCancelled();
+    }
+    @Nullable
+    public PlayerGameModeChangeEvent changeGameModeForPlayer(GameType gameMode, org.bukkit.event.player.PlayerGameModeChangeEvent.Cause cause, @Nullable net.kyori.adventure.text.Component cancelMessage) {
+        // Paper end - Expand PlayerGameModeChangeEvent
         if (gameMode == this.gameModeForPlayer) {
-            return false;
+            return null; // Paper - Expand PlayerGameModeChangeEvent
         } else {
             // CraftBukkit start
-            PlayerGameModeChangeEvent event = new PlayerGameModeChangeEvent(this.player.getBukkitEntity(), GameMode.getByValue(gameMode.getId()));
+            PlayerGameModeChangeEvent event = new PlayerGameModeChangeEvent(this.player.getBukkitEntity(), GameMode.getByValue(gameMode.getId()), cause, cancelMessage); // Paper
             this.level.getCraftServer().getPluginManager().callEvent(event);
             if (event.isCancelled()) {
-                return false;
+                return event; // Paper - Expand PlayerGameModeChangeEvent
             }
             // CraftBukkit end
             this.setGameModeForPlayer(gameMode, this.previousGameModeForPlayer);
@@ -90,7 +97,7 @@ public class ServerPlayerGameMode {
                 this.player.resetCurrentImpulseContext();
             }
 
-            return true;
+            return event; // Paper - Expand PlayerGameModeChangeEvent
         }
     }
 
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index f84a6f1ec9d1081b05ab44dd99659918aa0f1874..806f16a183ff1abae4cc21409bf8d26e0803483d 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2719,7 +2719,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
 
                     this.player = this.server.getPlayerList().respawn(this.player, false, RespawnReason.DEATH);
                     if (this.server.isHardcore()) {
-                        this.player.setGameMode(GameType.SPECTATOR);
+                        this.player.setGameMode(GameType.SPECTATOR, org.bukkit.event.player.PlayerGameModeChangeEvent.Cause.HARDCORE_DEATH, null); // Paper - Expand PlayerGameModeChangeEvent
                         ((GameRules.BooleanValue) this.player.level().getGameRules().getRule(GameRules.RULE_SPECTATORSGENERATECHUNKS)).set(false, this.player.serverLevel()); // CraftBukkit - per-world
                     }
                 }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index ca046ab01c39546b0f4abb95a50045c48e850a6c..69013e355fe5a846d825fa07c37c28aaabd04585 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -1640,7 +1640,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         Preconditions.checkArgument(mode != null, "GameMode cannot be null");
         if (this.getHandle().connection == null) return;
 
-        this.getHandle().setGameMode(GameType.byId(mode.getValue()));
+        this.getHandle().setGameMode(GameType.byId(mode.getValue()), org.bukkit.event.player.PlayerGameModeChangeEvent.Cause.PLUGIN, null); // Paper - Expand PlayerGameModeChangeEvent
     }
 
     @Override