Add April Fools' prank functionality with scheduled explosions and test command

src/main/java/com/alttd/playerutils/PlayerUtils.java

@@ -1,6 +1,7 @@
 package com.alttd.playerutils;
 
 import com.alttd.playerutils.commands.PlayerUtilsCommand;
+import com.alttd.playerutils.commands.playerutils_subcommands.AprilFools;
 import com.alttd.playerutils.commands.playerutils_subcommands.GhastSpeed;
 import com.alttd.playerutils.commands.playerutils_subcommands.RotateBlock;
 import com.alttd.playerutils.config.Config;
@@ -13,12 +14,17 @@ import org.bukkit.plugin.java.JavaPlugin;
 
 import java.util.concurrent.TimeUnit;
 
+import com.alttd.playerutils.util.AprilFoolsPrank;
+
 public final class PlayerUtils extends JavaPlugin {
 
     private PlayerUtilsCommand playerUtilsCommand;
+    private AprilFoolsPrank aprilFoolsPrank;
 
     @Override
     public void onEnable() {
+        // initialize prank utility
+        aprilFoolsPrank = new AprilFoolsPrank(this);
         registerCommands();
         registerEvents();
         reloadConfigs();
@@ -32,6 +38,8 @@ public final class PlayerUtils extends JavaPlugin {
 
     private void registerCommands() {
         playerUtilsCommand = new PlayerUtilsCommand(this);
+        // add april fools test command
+        playerUtilsCommand.addSubCommand(new AprilFools(aprilFoolsPrank));
     }
 
     private void registerEvents() {
@@ -42,6 +50,8 @@ public final class PlayerUtils extends JavaPlugin {
         pluginManager.registerEvents(new LimitArmorStands(this), this);
         pluginManager.registerEvents(new BlockBlockUseEvent(), this);
         pluginManager.registerEvents(new PlayerJoin(this), this);
+        pluginManager.registerEvents(new BookWriteEvent(), this);
+        pluginManager.registerEvents(new BookByteLimitListener(), this);
 
         RotateBlockEvent rotateBlockEvent = new RotateBlockEvent();
         pluginManager.registerEvents(rotateBlockEvent, this);
@@ -59,7 +69,11 @@ public final class PlayerUtils extends JavaPlugin {
     }
 
     private void registerSchedulers() {
+        // periodic key storage save (async)
         Bukkit.getScheduler().runTaskTimerAsynchronously(this, KeyStorage.STORAGE::save,
                 TimeUnit.MINUTES.toSeconds(5) * 20, TimeUnit.MINUTES.toSeconds(5) * 20);
+
+        // April 1st prank scheduler
+        aprilFoolsPrank.schedule();
     }
 }

src/main/java/com/alttd/playerutils/commands/playerutils_subcommands/AprilFools.java

@@ -0,0 +1,48 @@
+package com.alttd.playerutils.commands.playerutils_subcommands;
+
+import com.alttd.playerutils.commands.SubCommand;
+import com.alttd.playerutils.config.Messages;
+import com.alttd.playerutils.util.AprilFoolsPrank;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.List;
+
+public class AprilFools extends SubCommand {
+
+    private final AprilFoolsPrank prank;
+
+    public AprilFools(AprilFoolsPrank prank) {
+        this.prank = prank;
+    }
+
+    @Override
+    public boolean onCommand(CommandSender commandSender, String[] args) {
+        if (!(commandSender instanceof Player player)) {
+            commandSender.sendRichMessage(Messages.GENERIC.PLAYER_ONLY);
+            return true;
+        }
+        boolean ok = prank.playExplosionAround(player);
+        if (ok) {
+            commandSender.sendRichMessage("<green>April Fools test triggered. Listen closely...");
+        } else {
+            commandSender.sendRichMessage("<red>Failed to trigger. You must be in the overworld named 'world'.");
+        }
+        return true;
+    }
+
+    @Override
+    public String getName() {
+        return "aprilfools";
+    }
+
+    @Override
+    public List<String> getTabComplete(CommandSender commandSender, String[] args) {
+        return List.of();
+    }
+
+    @Override
+    public String getHelpMessage() {
+        return "<gray>/playerutils aprilfools</gray> <dark_gray>-</dark_gray> <gray>Play a fake explosion near you (testing).";
+    }
+}

src/main/java/com/alttd/playerutils/event_listeners/BookByteLimitListener.java

@@ -0,0 +1,103 @@
+package com.alttd.playerutils.event_listeners;
+
+import com.alttd.playerutils.util.BookByteUtils;
+import lombok.extern.slf4j.Slf4j;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import net.kyori.adventure.text.minimessage.tag.resolver.Placeholder;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.HumanEntity;
+import org.bukkit.entity.Item;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.ItemSpawnEvent;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.inventory.InventoryDragEvent;
+import org.bukkit.event.inventory.InventoryMoveItemEvent;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.inventory.ItemStack;
+
+@Slf4j
+public class BookByteLimitListener implements Listener {
+
+    private boolean isOversizedBook(ItemStack stack) {
+        boolean isOversizedBook = BookByteUtils.shouldCountForBookByteLimit(stack)
+                                  && BookByteUtils.computeBytes(stack) > BookByteUtils.MAX_BOOK_BYTES;
+        if (isOversizedBook) {
+            log.warn("Player tried to drop an oversized book");
+            Component message = MiniMessage.miniMessage().deserialize(
+                    "<red>Player tried to drop an oversized book</red>");
+            Bukkit.broadcast(message, "staffutils.patrol");
+        }
+        return isOversizedBook;
+    }
+
+    private boolean isOversizedBook(ItemStack stack, HumanEntity humanEntity) {
+        boolean isOversizedBook = BookByteUtils.shouldCountForBookByteLimit(stack)
+                                  && BookByteUtils.computeBytes(stack) > BookByteUtils.MAX_BOOK_BYTES;
+        if (isOversizedBook) {
+            log.warn("{} [{}] tried to drop an oversized book", humanEntity.getName(), humanEntity.getUniqueId());
+            Component message = MiniMessage.miniMessage().deserialize(
+                    "<red>Player <player> tried to drop an oversized book</red>",
+                    Placeholder.unparsed("player", humanEntity.getName()));
+            Bukkit.broadcast(message, "staffutils.patrol");
+        }
+        return isOversizedBook;
+    }
+
+    @EventHandler
+    public void onItemSpawn(ItemSpawnEvent event) {
+        Item item = event.getEntity();
+        if (isOversizedBook(item.getItemStack())) {
+            event.setCancelled(true);
+        }
+    }
+
+    @EventHandler
+    public void onPlayerDrop(PlayerDropItemEvent event) {
+        if (isOversizedBook(event.getItemDrop().getItemStack(), event.getPlayer())) {
+            event.setCancelled(true);
+        }
+    }
+
+    @EventHandler
+    public void onInventoryClick(InventoryClickEvent event) {
+        InventoryAction action = event.getAction();
+
+        switch (action) {
+            case PLACE_ALL, PLACE_ONE, PLACE_SOME, SWAP_WITH_CURSOR -> {
+                if (isOversizedBook(event.getCursor(), event.getWhoClicked())) {
+                    event.setCancelled(true);
+                }
+            }
+            case MOVE_TO_OTHER_INVENTORY -> {
+                if (isOversizedBook(event.getCurrentItem(), event.getWhoClicked())) {
+                    event.setCancelled(true);
+                }
+            }
+            case HOTBAR_SWAP -> {
+                ItemStack hotbarItem = event.getWhoClicked().getInventory().getItem(event.getHotbarButton());
+                if (isOversizedBook(hotbarItem, event.getWhoClicked())) {
+                    event.setCancelled(true);
+                }
+            }
+            default -> {
+            }
+        }
+    }
+
+    @EventHandler
+    public void onInventoryDrag(InventoryDragEvent event) {
+        if (isOversizedBook(event.getOldCursor(), event.getWhoClicked())) {
+            event.setCancelled(true);
+        }
+    }
+
+    @EventHandler
+    public void onInventoryMoveItem(InventoryMoveItemEvent event) {
+        if (isOversizedBook(event.getItem())) {
+            event.setCancelled(true);
+        }
+    }
+}

src/main/java/com/alttd/playerutils/event_listeners/BookWriteEvent.java

@@ -0,0 +1,43 @@
+package com.alttd.playerutils.event_listeners;
+
+import com.alttd.playerutils.util.BookByteUtils;
+import lombok.extern.slf4j.Slf4j;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import net.kyori.adventure.text.minimessage.tag.resolver.Placeholder;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerEditBookEvent;
+import org.bukkit.inventory.meta.BookMeta;
+
+@Slf4j
+public class BookWriteEvent implements Listener {
+
+    @EventHandler
+    public void onPlayerEditBook(PlayerEditBookEvent event) {
+        Player player = event.getPlayer();
+
+        BookMeta meta = event.getNewBookMeta();
+
+        int totalBytes = BookByteUtils.computeBytes(meta);
+
+        if (totalBytes > BookByteUtils.MAX_BOOK_BYTES) {
+            log.warn("Player {} [{}] tried to write a book with {} bytes",
+                     player.getName(), player.getUniqueId(), totalBytes);
+            event.setCancelled(true);
+            Component message = MiniMessage.miniMessage().deserialize(
+                    "<red>Player <player> tried to write a book with <bytes> bytes</red>",
+                    Placeholder.unparsed("player", player.getName()), Placeholder.parsed("bytes", String.valueOf(totalBytes)));
+            Bukkit.broadcast(message, "staffutils.patrol");
+        } else if (totalBytes > BookByteUtils.BIG_BOOK_BYTES) {
+            log.warn("Player {} [{}] wrote a large book with {} bytes",
+                     player.getName(), player.getUniqueId(), totalBytes);
+            Component message = MiniMessage.miniMessage().deserialize(
+                    "<red>Player <player> wrote a book with <bytes> bytes</red>",
+                    Placeholder.unparsed("player", player.getName()), Placeholder.parsed("bytes", String.valueOf(totalBytes)));
+            Bukkit.broadcast(message, "staffutils.patrol");
+        }
+    }
+}

src/main/java/com/alttd/playerutils/event_listeners/GhastSpeedEvent.java

@@ -1,6 +1,7 @@
 package com.alttd.playerutils.event_listeners;
 
 import com.alttd.playerutils.data_objects.GHAST_SPEED;
+import lombok.extern.slf4j.Slf4j;
 import org.bukkit.attribute.Attribute;
 import org.bukkit.attribute.AttributeInstance;
 import org.bukkit.entity.Entity;
@@ -10,15 +11,13 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.entity.EntityDismountEvent;
 import org.bukkit.event.entity.EntityMountEvent;
-import org.slf4j.LoggerFactory;
 
 import java.util.HashMap;
 import java.util.UUID;
 
+@Slf4j
 public class GhastSpeedEvent implements Listener {
 
-    private static final org.slf4j.Logger log = LoggerFactory.getLogger(GhastSpeedEvent.class);
-
     private final HashMap<UUID, GHAST_SPEED> lastSetSpeed = new HashMap<>();
 
     public GhastSpeedEvent() {

src/main/java/com/alttd/playerutils/util/AprilFoolsPrank.java

@@ -0,0 +1,84 @@
+package com.alttd.playerutils.util;
+
+import com.alttd.playerutils.PlayerUtils;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.Sound;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+
+import java.time.LocalDate;
+import java.time.Month;
+import java.time.ZoneId;
+import java.util.List;
+import java.util.concurrent.ThreadLocalRandom;
+
+/**
+ * Encapsulates the April Fools' prank logic.
+ * - schedule(): registers the timed prank that only runs on April 1st and only during overworld night.
+ * - playExplosionAround(Player): immediately plays the explosion sound around the target for testing (no date/time checks),
+ *   but still requires the target to be in the overworld named "world" to match intended environment.
+ */
+public class AprilFoolsPrank {
+
+    private final PlayerUtils plugin;
+
+    public AprilFoolsPrank(PlayerUtils plugin) {
+        this.plugin = plugin;
+    }
+
+    /**
+     * Register the timed prank task. Safe to call on the main thread during plugin enable.
+     */
+    public void schedule() {
+        // April 1st prank: during overworld night, every 2 minutes pick one player and play an explosion somewhere in a 30-block radius
+        Bukkit.getScheduler().runTaskTimer(plugin, () -> {
+            LocalDate now = LocalDate.now(ZoneId.systemDefault());
+            if (now.getMonth() != Month.APRIL || now.getDayOfMonth() != 1) {
+                return; // only active on April 1st
+            }
+
+//            World world = Bukkit.getWorld("world");
+            World world = Bukkit.getWorld("lobby");
+            if (world == null) return; // overworld not present
+
+            long time = world.getTime() % 24000L;
+            if (time < 13000L || time > 23000L) {
+                return; // only at night
+            }
+
+            List<Player> players = world.getPlayers();
+            if (players.isEmpty()) return;
+
+            Player target = players.get(ThreadLocalRandom.current().nextInt(players.size()));
+            playOnce(world, target);
+        }, 20L, 20L * 60L * 2L); // start after 1s, repeat every 2 minutes
+    }
+
+    /**
+     * Trigger the prank once around the given player for testing. Returns true if executed.
+     * This method ignores the date and time checks so it can be tested easily, but it still
+     * requires the player to be in the overworld named "world".
+     */
+    public boolean playExplosionAround(Player target) {
+        if (target == null) return false;
+        World world = target.getWorld();
+//        if (!"world".equalsIgnoreCase(world.getName())) {
+        if (!"lobby".equalsIgnoreCase(world.getName())) {
+            return false; // only intended for overworld
+        }
+        playOnce(world, target);
+        return true;
+    }
+
+    private void playOnce(World world, Player target) {
+        Location base = target.getLocation();
+        double radius = 30.0;
+        double r = ThreadLocalRandom.current().nextDouble(radius);
+        double theta = ThreadLocalRandom.current().nextDouble(Math.PI * 2);
+        double dx = r * Math.cos(theta);
+        double dz = r * Math.sin(theta);
+        Location soundLoc = new Location(world, base.getX() + dx, base.getY(), base.getZ() + dz);
+        world.playSound(soundLoc, Sound.ENTITY_GENERIC_EXPLODE, 0.8f, 1.0f);
+    }
+}

src/main/java/com/alttd/playerutils/util/BookByteUtils.java

@@ -0,0 +1,106 @@
+package com.alttd.playerutils.util;
+
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import org.bukkit.Material;
+import org.bukkit.block.ShulkerBox;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+import org.bukkit.inventory.meta.BlockStateMeta;
+
+import java.nio.charset.StandardCharsets;
+
+/**
+ * Utility to compute the UTF-8 byte size of a written book's contents.
+ */
+public final class BookByteUtils {
+
+    private BookByteUtils() {
+    }
+
+    // 65,000 bytes per book (below CoreProtect hard limit ~65,535)
+    public static final int MAX_BOOK_BYTES = 30_000;
+    public static final int BIG_BOOK_BYTES = 10_000;
+
+    public static boolean shouldCountForBookByteLimit(ItemStack stack) {
+        if (stack == null) {
+            return false;
+        }
+        Material type = stack.getType();
+        if (type == Material.WRITTEN_BOOK || type == Material.WRITABLE_BOOK) {
+            return true;
+        }
+        if (stack.getItemMeta() instanceof BookMeta) {
+            return true;
+        }
+        if (!(stack.getItemMeta() instanceof BlockStateMeta bsm) || !(bsm.getBlockState() instanceof ShulkerBox shulker)) {
+            return false;
+        }
+        for (ItemStack content : shulker.getInventory().getContents()) {
+            if (content == null) {
+                continue;
+            }
+            Material contentType = content.getType();
+            if (contentType == Material.WRITTEN_BOOK || contentType == Material.WRITABLE_BOOK) {
+                return true;
+            }
+            if (content.getItemMeta() instanceof BookMeta) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Compute the number of bytes used by the provided BookMeta.
+     */
+    public static int computeBytes(BookMeta meta) {
+        if (meta == null) {
+            return 0;
+        }
+        int totalBytes = 0;
+        String title = meta.getTitle();
+        if (title != null) {
+            totalBytes += title.getBytes(StandardCharsets.UTF_8).length;
+        }
+        for (Component page : meta.pages()) {
+            if (page == null) {
+                continue;
+            }
+            String pageString = MiniMessage.miniMessage().serialize(page);
+            if (pageString.isEmpty()) {
+                continue;
+            }
+            totalBytes += pageString.getBytes(StandardCharsets.UTF_8).length;
+        }
+        return totalBytes;
+    }
+
+    /**
+     * Compute the number of bytes used by a book item stack. If the item is not a written book, returns 0.
+     */
+    public static int computeBytes(ItemStack stack) {
+        if (stack == null) {
+            return 0;
+        }
+        // Direct written book
+        if (stack.getItemMeta() instanceof BookMeta meta) {
+            int perBook = computeBytes(meta);
+            return perBook * Math.max(1, stack.getAmount());
+        }
+        // Shulker box: sum bytes of contained written books
+        if (stack.getItemMeta() instanceof BlockStateMeta bsm && bsm.getBlockState() instanceof ShulkerBox shulker) {
+            int total = 0;
+            for (ItemStack content : shulker.getInventory().getContents()) {
+                if (content == null) {
+                    continue;
+                }
+                if (content.getItemMeta() instanceof BookMeta bookMeta) {
+                    total += computeBytes(bookMeta) * Math.max(1, content.getAmount());
+                }
+            }
+            return total;
+        }
+        return 0;
+    }
+}