From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samsuik <kfian294ma4@gmail.com>
Date: Tue, 21 Sep 2021 23:54:25 +0100
Subject: [PATCH] Visibility API and Command


diff --git a/src/main/java/me/samsuik/sakura/command/SakuraCommands.java b/src/main/java/me/samsuik/sakura/command/SakuraCommands.java
index 3b08454cf7411d12bb33225df59800bd73312123..22676ec7a7ae9494b198e5e65e6be6d32e0feb85 100644
--- a/src/main/java/me/samsuik/sakura/command/SakuraCommands.java
+++ b/src/main/java/me/samsuik/sakura/command/SakuraCommands.java
@@ -2,6 +2,9 @@ package me.samsuik.sakura.command;
 
 import io.papermc.paper.command.PaperPluginsCommand;
 import me.samsuik.sakura.command.subcommands.ConfigCommand;
+import me.samsuik.sakura.command.subcommands.FPSCommand;
+import me.samsuik.sakura.command.subcommands.VisualCommand;
+import me.samsuik.sakura.player.visibility.Visibility;
 import net.minecraft.server.MinecraftServer;
 import org.bukkit.command.Command;
 
@@ -14,6 +17,10 @@ public final class SakuraCommands {
     static {
         COMMANDS.put("sakura", new SakuraCommand("sakura"));
         COMMANDS.put("config", new ConfigCommand("config"));
+        COMMANDS.put("fps", new FPSCommand("fps"));
+        COMMANDS.put("tntvisibility", new VisualCommand(Visibility.Setting.TNT_VISIBILITY, "tnttoggle"));
+        COMMANDS.put("sandvisibility", new VisualCommand(Visibility.Setting.SAND_VISIBILITY, "sandtoggle"));
+        COMMANDS.put("minimal", new VisualCommand(Visibility.Setting.MINIMAL, "minimaltnt", "tntlag"));
     }
 
     public static void registerCommands(final MinecraftServer server) {
diff --git a/src/main/java/me/samsuik/sakura/command/subcommands/FPSCommand.java b/src/main/java/me/samsuik/sakura/command/subcommands/FPSCommand.java
new file mode 100644
index 0000000000000000000000000000000000000000..aa5ddf696b09226a0bd3d967d2ac2b11fc2deb32
--- /dev/null
+++ b/src/main/java/me/samsuik/sakura/command/subcommands/FPSCommand.java
@@ -0,0 +1,26 @@
+package me.samsuik.sakura.command.subcommands;
+
+import me.samsuik.sakura.command.BaseSubCommand;
+import me.samsuik.sakura.player.visibility.VisibilityGUI;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+@DefaultQualifier(NonNull.class)
+public final class FPSCommand extends BaseSubCommand {
+
+    private final VisibilityGUI VISIBILITY_GUI = new VisibilityGUI();
+
+    public FPSCommand(String name) {
+        super(name);
+    }
+
+    @Override
+    public void execute(CommandSender sender, String[] args) {
+        if (sender instanceof Player player) {
+            VISIBILITY_GUI.showTo(player);
+        }
+    }
+
+}
diff --git a/src/main/java/me/samsuik/sakura/command/subcommands/VisualCommand.java b/src/main/java/me/samsuik/sakura/command/subcommands/VisualCommand.java
new file mode 100644
index 0000000000000000000000000000000000000000..148a583279333eeb3e5db16652623082cd5e0e60
--- /dev/null
+++ b/src/main/java/me/samsuik/sakura/command/subcommands/VisualCommand.java
@@ -0,0 +1,45 @@
+package me.samsuik.sakura.command.subcommands;
+
+import me.samsuik.sakura.command.BaseSubCommand;
+import me.samsuik.sakura.configuration.GlobalConfiguration;
+import me.samsuik.sakura.player.visibility.Visibility;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import net.kyori.adventure.text.minimessage.tag.resolver.Placeholder;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import java.util.Arrays;
+
+@DefaultQualifier(NonNull.class)
+public final class VisualCommand extends BaseSubCommand {
+
+    private final Visibility.Setting type;
+
+    public VisualCommand(Visibility.Setting type, String... aliases) {
+        super(type.basicName());
+        this.setAliases(Arrays.asList(aliases));
+        this.type = type;
+    }
+
+    @Override
+    public void execute(CommandSender sender, String[] args) {
+        if (!(sender instanceof Player player)) {
+            return;
+        }
+
+        var visibility = player.getVisibility();
+
+        // Toggle clicked setting visibility
+        visibility.toggle(type);
+
+        // Send message to player
+        var state = visibility.isEnabled(type) ? "Enabled" : "Disabled";
+        player.sendMessage(MiniMessage.miniMessage().deserialize(GlobalConfiguration.get().fps.message,
+            Placeholder.unparsed("name", type.friendlyName()),
+            Placeholder.unparsed("state", state))
+        );
+    }
+
+}
diff --git a/src/main/java/me/samsuik/sakura/player/visibility/VisibilityGUI.java b/src/main/java/me/samsuik/sakura/player/visibility/VisibilityGUI.java
new file mode 100644
index 0000000000000000000000000000000000000000..6f74429456e78f17fa3e4426d9d9b5f008d8df42
--- /dev/null
+++ b/src/main/java/me/samsuik/sakura/player/visibility/VisibilityGUI.java
@@ -0,0 +1,123 @@
+package me.samsuik.sakura.player.visibility;
+
+import me.samsuik.sakura.configuration.GlobalConfiguration;
+import me.samsuik.sakura.player.gui.ItemIcon;
+import me.samsuik.sakura.player.gui.PlayerGUI;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.text.format.TextDecoration;
+import net.kyori.adventure.text.minimessage.tag.resolver.Placeholder;
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+
+import java.util.function.BiFunction;
+
+public final class VisibilityGUI extends PlayerGUI {
+
+    private static final BiFunction<Player, Holder, Inventory> CREATE_INVENTORY = (player, holder) -> {
+        Inventory inventory = Bukkit.createInventory(holder, 45, Component.text("FPS GUI"));
+
+        for (int i = 0; i < inventory.getSize(); ++i) {
+            int column = i % 9;
+            int row    = (i + 1) / 9;
+
+            Material background = column > 0 && column < 8 ? (row > 0 && row < 4 || column > 1 && column < 7)
+                ? Material.matchMaterial(GlobalConfiguration.get().fps.material)
+                : Material.WHITE_STAINED_GLASS_PANE
+                : Material.BLACK_STAINED_GLASS_PANE;
+
+            ItemStack itemstack = new ItemStack(background);
+            ItemMeta meta = itemstack.getItemMeta();
+            meta.displayName(Component.space());
+            itemstack.setItemMeta(meta);
+
+            inventory.setItem(i, itemstack);
+        }
+
+        return inventory;
+    };
+
+    public VisibilityGUI() {
+        super(CREATE_INVENTORY);
+    }
+
+    @Override
+    protected void register() {
+        registerFPSIcon(Visibility.Setting.TNT_VISIBILITY, 12);
+        registerFPSIcon(Visibility.Setting.SAND_VISIBILITY, 14);
+        registerFPSIcon(Visibility.Setting.MINIMAL, 13);
+        registerFPSIcon(Visibility.Setting.SPAWNERS, 20);
+        // ...22
+        registerFPSIcon(Visibility.Setting.EXPLOSIONS, 24);
+        registerFPSIcon(Visibility.Setting.PISTONS, 30);
+        registerFPSIcon(Visibility.Setting.REDSTONE, 31);
+        registerFPSIcon(Visibility.Setting.ENCHANTMENT_GLINT, 32);
+
+        registerIcon(new ItemIcon(player -> {
+            Visibility.State state = player.getVisibility().getState();
+            ItemStack itemstack = new ItemStack(state.material());
+
+            itemstack.editMeta(meta -> {
+                Component title = Component.text("Toggle all", state.colour());
+
+                // italic is default
+                title = title.decoration(TextDecoration.ITALIC, false);
+
+                meta.displayName(title.append(Component.space())
+                    .append(Component.text(state.title(), NamedTextColor.GRAY)));
+            });
+
+            return itemstack;
+        }, player -> {
+            player.getVisibility().toggleAll();
+            // refresh icons after toggling
+            this.refresh(player);
+        }, 26));
+    }
+
+    private void registerFPSIcon(Visibility.Setting setting, int slot) {
+        registerIcon(new ItemIcon(player -> {
+            Visibility visibility = player.getVisibility();
+            ItemStack itemstack = new ItemStack(setting.material());
+
+            itemstack.editMeta(meta -> {
+                // Get the current state as a string
+                String state = visibility.isEnabled(setting) ? "Enabled" : "Disabled";
+
+                // Friendly name as a component
+                Component title = Component.text(setting.friendlyName(), setting.colour());
+
+                // Display names are italic by default
+                title = title.decoration(TextDecoration.ITALIC, false);
+
+                // Set the display name
+                meta.displayName(title.append(Component.space())
+                    .append(Component.text(state, NamedTextColor.GRAY)));
+            });
+
+            return itemstack;
+        }, player -> {
+            Visibility visibility = player.getVisibility();
+
+            // Toggle clicked setting visibility
+            visibility.toggle(setting);
+
+            // Get the current state as a string
+            String state = visibility.isEnabled(setting) ? "Enabled" : "Disabled";
+
+            // Send message to player
+            player.sendRichMessage(GlobalConfiguration.get().fps.message,
+                Placeholder.unparsed("name", setting.friendlyName()),
+                Placeholder.unparsed("state", state)
+            );
+
+            // Update toggle all icon
+            this.refreshSlot(player, 26);
+        }, slot));
+    }
+
+}
diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundSectionBlocksUpdatePacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundSectionBlocksUpdatePacket.java
index 1a37654aff9a9c86c9f7af10a1cf721371f0c5ec..82644b34a77dc5e5af38260b7b07b3ec9aceae33 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundSectionBlocksUpdatePacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundSectionBlocksUpdatePacket.java
@@ -19,7 +19,7 @@ public class ClientboundSectionBlocksUpdatePacket implements Packet<ClientGamePa
     private static final int POS_IN_SECTION_BITS = 12;
     private final SectionPos sectionPos;
     private final short[] positions;
-    private final BlockState[] states;
+    public final BlockState[] states; // Sakura - private -> public
 
     public ClientboundSectionBlocksUpdatePacket(SectionPos sectionPos, ShortSet positions, LevelChunkSection section) {
         this.sectionPos = sectionPos;
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index aae93a7f1b7c7744e4cd354b6d070d4f2d4d8843..dd5994f65ef31a41d0f4f06f4990078d4c20a450 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1799,6 +1799,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             this.profiler.pop();
             worldserver.explosionDensityCache.clear(); // Paper - Optimize explosions
             worldserver.localConfig().expire(currentTickLong); // Sakura - add local config
+            worldserver.minimalTNT.clear(); // Sakura - visibility api
         }
         this.isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
 
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index 7fb9ba3dadb1eca4a1000ea8cf4d13fed2b7db1e..7fb48e8924e7f6acfcaaecf284f9bf1925612a16 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -1438,6 +1438,22 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
                 }
                 // Paper end - Configurable entity tracking range by Y
 
+                // Sakura start - visibility api
+                if (this.entity.isPrimedTNT && player.visibility.isToggled(me.samsuik.sakura.player.visibility.Visibility.Setting.TNT_VISIBILITY)
+                    || this.entity.isFallingBlock && player.visibility.isToggled(me.samsuik.sakura.player.visibility.Visibility.Setting.SAND_VISIBILITY)) {
+                    flag = false;
+                }
+
+                if (flag && (this.entity.isPrimedTNT || this.entity.isFallingBlock) && player.visibility.isToggled(me.samsuik.sakura.player.visibility.Visibility.Setting.MINIMAL)) {
+                    long key = entity.blockPosition().asLong();
+
+                    if (level.minimalTNT.containsKey(key)) {
+                        flag = level.minimalTNT.get(key) == entity.getId();
+                    } else {
+                        level.minimalTNT.put(key, entity.getId());
+                    }
+                }
+                // Sakura end
                 // CraftBukkit start - respect vanish API
                 if (flag && !player.getBukkitEntity().canSee(this.entity.getBukkitEntity())) { // Paper - only consider hits
                     flag = false;
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index b5a66132f7ec10feb4682db38c80e5064e78f9f3..35ec5faff8a1cad4c35ee075885889844534efc9 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1960,7 +1960,19 @@ public class ServerLevel extends Level implements WorldGenLevel {
             ServerPlayer entityplayer = (ServerPlayer) iterator.next();
 
             if (entityplayer.distanceToSqr(x, y, z) < 4096.0D) {
-                entityplayer.connection.send(new ClientboundExplodePacket(x, y, z, power, explosion.getToBlow(), (Vec3) explosion.getHitPlayers().get(entityplayer), explosion.getBlockInteraction(), explosion.getSmallExplosionParticles(), explosion.getLargeExplosionParticles(), explosion.getExplosionSound()));
+                // Sakura start - visibility api; let players toggle explosion particles
+                ParticleOptions smallParticle = explosion.getSmallExplosionParticles();
+                ParticleOptions largeParticle = explosion.getLargeExplosionParticles();
+                Vec3 position = new Vec3(x, y, z);
+                // In 1.22 and later this should be replaced with sending the motion through a PlayerPositionPacket.
+                // The problem here is SetEntityMotion is capped to 3.9 b/pt and the only other alternate mean was
+                // implemented in 1.21.3. I believe it's best to just wait on this issue and deal with this hack.
+                if (entityplayer.visibility.isToggled(me.samsuik.sakura.player.visibility.Visibility.Setting.EXPLOSIONS)) {
+                    position = new Vec3(0.0, -1024.0, 0.0);
+                    smallParticle = largeParticle = net.minecraft.core.particles.ParticleTypes.SMOKE;
+                }
+                entityplayer.connection.send(new ClientboundExplodePacket(position.x(), position.y(), position.z(), power, explosion.getToBlow(), (Vec3) explosion.getHitPlayers().get(entityplayer), explosion.getBlockInteraction(), smallParticle, largeParticle, explosion.getExplosionSound()));
+                // Sakura end - visibility api; let players toggle explosion particles
             }
         }
 
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 6a4637eef14cbd84bbe26ef16f004b8f93367a3d..bed136477493365d62d1b82e8f7802513a394991 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -277,6 +277,7 @@ public class ServerPlayer extends Player {
     public final int[] mobCounts = new int[MOBCATEGORY_TOTAL_ENUMS]; // Paper
     // Paper end - Optional per player mob spawns
     public final int[] mobBackoffCounts = new int[MOBCATEGORY_TOTAL_ENUMS]; // Paper - per player mob count backoff
+    public final me.samsuik.sakura.player.visibility.Visibility visibility = new me.samsuik.sakura.player.visibility.Visibility(); // Sakura - visiblity api
 
     // CraftBukkit start
     public CraftPlayer.TransferCookieConnection transferCookieConnection;
@@ -596,6 +597,15 @@ public class ServerPlayer extends Player {
                 this.respawnDimension = (ResourceKey) dataresult1.resultOrPartial(logger1::error).orElse(Level.OVERWORLD);
             }
         }
+        // Sakura start - visibility api
+        CompoundTag tag = nbt.getCompound("Sakura.Visuals");
+
+        for (me.samsuik.sakura.player.visibility.Visibility.Setting setting : me.samsuik.sakura.player.visibility.Visibility.Setting.values()) {
+            if (tag.getBoolean(setting.name())) {
+                visibility.toggle(setting);
+            }
+        }
+        // Sakura end - visibility api
 
         this.spawnExtraParticlesOnFall = nbt.getBoolean("spawn_extra_particles_on_fall");
         Tag nbtbase = nbt.get("raid_omen_position");
@@ -674,6 +684,13 @@ public class ServerPlayer extends Player {
             });
         }
         this.getBukkitEntity().setExtraData(nbt); // CraftBukkit
+        // Sakura start - visibility api
+        CompoundTag tag = new CompoundTag();
+        for (me.samsuik.sakura.player.visibility.Visibility.Setting setting : me.samsuik.sakura.player.visibility.Visibility.Setting.values()) {
+            tag.putBoolean(setting.name(), visibility.isToggled(setting));
+        }
+        nbt.put("Sakura.Visuals", tag);
+        // Sakura end - visibility api
 
         nbt.putBoolean("spawn_extra_particles_on_fall", this.spawnExtraParticlesOnFall);
         if (this.raidOmenPosition != null) {
diff --git a/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
index 308aef9c4933b2bcdd622a34b68efab4a220fe4d..2aee1167e7c4f47f3fe82d135904beac0374bdfd 100644
--- a/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
@@ -42,6 +42,23 @@ import org.bukkit.craftbukkit.util.CraftLocation;
 import org.bukkit.craftbukkit.util.Waitable;
 import org.bukkit.event.player.PlayerKickEvent;
 import org.bukkit.event.player.PlayerResourcePackStatusEvent;
+// Sakura start
+import com.mojang.datafixers.util.Pair;
+import me.samsuik.sakura.player.visibility.Visibility.Setting;
+import net.minecraft.core.component.DataComponents;
+import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
+import net.minecraft.network.protocol.game.ClientboundBlockEventPacket;
+import net.minecraft.network.protocol.game.ClientboundBlockUpdatePacket;
+import net.minecraft.network.protocol.game.ClientboundSectionBlocksUpdatePacket;
+import net.minecraft.network.protocol.game.ClientboundSetEquipmentPacket;
+import net.minecraft.world.entity.EquipmentSlot;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.DiodeBlock;
+import net.minecraft.world.level.block.RedStoneWireBlock;
+import net.minecraft.world.level.block.piston.PistonBaseBlock;
+import net.minecraft.world.level.block.piston.PistonHeadBlock;
+// Sakura end
 
 public abstract class ServerCommonPacketListenerImpl implements ServerCommonPacketListener, CraftPlayer.TransferCookieConnection {
 
@@ -94,6 +111,65 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
     protected final org.bukkit.craftbukkit.CraftServer cserver;
     public boolean processedDisconnect;
 
+    // Sakura start - visibility api
+    private @Nullable Packet<?> recreatePacket(Packet<?> packet) {
+        me.samsuik.sakura.player.visibility.Visibility visibility = this.player.visibility;
+        if (packet instanceof ClientboundSetEquipmentPacket equipment && visibility.isToggled(Setting.ENCHANTMENT_GLINT)) {
+            java.util.List<Pair<EquipmentSlot, ItemStack>> slots = new java.util.ArrayList<>();
+
+            for (int i = 0; i < equipment.getSlots().size(); i++) {
+                Pair<EquipmentSlot, ItemStack> pair = equipment.getSlots().get(i);
+                ItemStack itemstack = pair.getSecond();
+
+                if (itemstack.isEnchanted()) {
+                    ItemStack copy = itemstack.copy();
+                    copy.remove(DataComponents.ENCHANTMENTS);
+                    itemstack = copy;
+                }
+
+                slots.add(new Pair<>(pair.getFirst(), itemstack));
+            }
+
+            packet = new ClientboundSetEquipmentPacket(equipment.getEntity(), slots);
+        } else if (packet instanceof ClientboundBlockEntityDataPacket blockdata
+            && visibility.isToggled(Setting.SPAWNERS)
+            && this.player.level().getBlockIfLoaded(blockdata.getPos()) == Blocks.SPAWNER) {
+            packet = new ClientboundBlockUpdatePacket(blockdata.getPos(), Blocks.BLACK_STAINED_GLASS.defaultBlockState());
+        } else if (packet instanceof ClientboundBlockUpdatePacket updatePacket) {
+            if (visibility.isToggled(Setting.SPAWNERS) && updatePacket.blockState.getBlock() == Blocks.SPAWNER) {
+                packet = new ClientboundBlockUpdatePacket(updatePacket.getPos(), Blocks.BLACK_STAINED_GLASS.defaultBlockState());
+            } else if (visibility.isToggled(Setting.REDSTONE)
+                && (updatePacket.blockState.getBlock() instanceof DiodeBlock
+                || updatePacket.blockState.getBlock() instanceof RedStoneWireBlock)) {
+                return null;
+            } else if (visibility.isToggled(Setting.PISTONS)
+                && (updatePacket.blockState.getBlock() instanceof PistonBaseBlock
+                || updatePacket.blockState.getBlock() instanceof PistonHeadBlock)) {
+                return null;
+            }
+        } else if (packet instanceof ClientboundSectionBlocksUpdatePacket sectionPacket) {
+            for (net.minecraft.world.level.block.state.BlockState state : sectionPacket.states) {
+                if (visibility.isToggled(Setting.REDSTONE)
+                    && (state.getBlock() instanceof DiodeBlock
+                    || state.getBlock() instanceof RedStoneWireBlock)) {
+                    return null;
+                } else if (visibility.isToggled(Setting.PISTONS)
+                    && (state.getBlock() instanceof PistonBaseBlock
+                    || state.getBlock() instanceof PistonHeadBlock)) {
+                    return null;
+                }
+            }
+        } else if (packet instanceof ClientboundBlockEventPacket blockevent
+            && visibility.isToggled(Setting.PISTONS)
+            && (blockevent.getBlock() instanceof PistonBaseBlock
+            || blockevent.getBlock() instanceof PistonHeadBlock)) {
+            return null;
+        }
+
+        return packet;
+    }
+    // Sakura end - visibility api
+
     public CraftPlayer getCraftPlayer() {
         return (this.player == null) ? null : (CraftPlayer) this.player.getBukkitEntity();
         // CraftBukkit end
@@ -300,6 +376,12 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
             ClientboundSetDefaultSpawnPositionPacket packet6 = (ClientboundSetDefaultSpawnPositionPacket) packet;
             this.player.compassTarget = CraftLocation.toBukkit(packet6.pos, this.getCraftPlayer().getWorld());
         }
+        // Sakura start - visibility api
+        if (this.player.visibility.isModified()) {
+            packet = this.recreatePacket(packet);
+            if (packet == null) return;
+        }
+        // Sakura end - visibility api
         // CraftBukkit end
         if (packet.isTerminal()) {
             this.close();
@@ -313,8 +395,11 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
             CrashReport crashreport = CrashReport.forThrowable(throwable, "Sending packet");
             CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Packet being sent");
 
+            // Sakura start - this has to be effectively final as we're modifying the packet above
+            var packetFinal = packet;
             crashreportsystemdetails.setDetail("Packet class", () -> {
-                return packet.getClass().getCanonicalName();
+                return packetFinal.getClass().getCanonicalName();
+                // Sakura end
             });
             throw new ReportedException(crashreport);
         }
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index dd0610104822bee532542c87ecc9cd16ccf3c216..e513380ae2988d466056fcedc7529b363544337e 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3172,6 +3172,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
 
                         event.setCancelled(cancelled);
                         AbstractContainerMenu oldContainer = this.player.containerMenu; // SPIGOT-1224
+                        me.samsuik.sakura.player.gui.PlayerGUI.onWindowClick(event); // Sakura - visibility gui
                         this.cserver.getPluginManager().callEvent(event);
                         if (this.player.containerMenu != oldContainer) {
                             return;
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 7ef9f67d27cc240191dd5d07e8dcf5fbdebe1049..c33e325d7eb4584986de338f966a79e868ef300e 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -568,6 +568,10 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
 
     public boolean updatingSectionStatus = false;
     // Paper end
+    // Sakura start - visibility api and command
+    public boolean isPrimedTNT;
+    public boolean isFallingBlock;
+    // Sakura end - visibility api and command
 
     public Entity(EntityType<?> type, Level world) {
         this.id = Entity.ENTITY_COUNTER.incrementAndGet();
diff --git a/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java b/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
index d504d10fbe45dfe3f2f3d08d2473df6cd18f6dcf..28b8efdd224e4dbb32f3eac1c9e2c512e2695dc8 100644
--- a/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
+++ b/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
@@ -74,6 +74,7 @@ public class FallingBlockEntity extends Entity {
         this.blockState = Blocks.SAND.defaultBlockState();
         this.dropItem = true;
         this.fallDamageMax = 40;
+        this.isFallingBlock = true; // Sakura
     }
 
     public FallingBlockEntity(Level world, double x, double y, double z, BlockState block) {
diff --git a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
index f1f352ec0e51f5db59254841a06c176c5a876fc9..dace8dc0c051ce9355d878154466ee3a548a3832 100644
--- a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
+++ b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
@@ -37,6 +37,7 @@ public class PrimedTnt extends Entity implements TraceableEntity {
     public PrimedTnt(EntityType<? extends PrimedTnt> type, Level world) {
         super(type, world);
         this.blocksBuilding = true;
+        this.isPrimedTNT = true; // Sakura
     }
 
     public PrimedTnt(Level world, double x, double y, double z, @Nullable LivingEntity igniter) {
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 1059530bb6f817352c8304f6a1544aeb5ac14b30..5a43957309019bec27b9624e5268d6a8c50c165d 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -217,6 +217,8 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
 
     public abstract ResourceKey<LevelStem> getTypeKey();
 
+    public final it.unimi.dsi.fastutil.longs.Long2IntMap minimalTNT = new it.unimi.dsi.fastutil.longs.Long2IntOpenHashMap(); // Sakura - visibility api
+
     protected Level(WritableLevelData worlddatamutable, ResourceKey<Level> resourcekey, RegistryAccess iregistrycustom, Holder<DimensionType> holder, Supplier<ProfilerFiller> supplier, boolean flag, boolean flag1, long i, int j, org.bukkit.generator.ChunkGenerator gen, org.bukkit.generator.BiomeProvider biomeProvider, org.bukkit.World.Environment env, java.util.function.Function<org.spigotmc.SpigotWorldConfig, io.papermc.paper.configuration.WorldConfiguration> paperWorldConfigCreator, Supplier<me.samsuik.sakura.configuration.WorldConfiguration> sakuraWorldConfigCreator, java.util.concurrent.Executor executor) { // Sakura - sakura configuration files // Paper - create paper world config; Async-Anti-Xray: Pass executor
         this.spigotConfig = new org.spigotmc.SpigotWorldConfig(((net.minecraft.world.level.storage.PrimaryLevelData) worlddatamutable).getLevelName()); // Spigot
         this.paperConfig = paperWorldConfigCreator.apply(this.spigotConfig); // Paper - create paper world config
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 32c3c2c6b2eaa90b149d9b425341e75b85bd9764..549d4c45d072e95b741ceb79779cd8fac65bf185 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -543,6 +543,13 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         this.getHandle().displayName = name == null ? this.getName() : name;
     }
 
+    // Sakura start - visiblity api
+    @Override
+    public me.samsuik.sakura.player.visibility.Visibility getVisibility() {
+        return getHandle().visibility;
+    }
+    // Sakura end
+
     // Paper start
     @Override
     public void playerListName(net.kyori.adventure.text.Component name) {