Shuffle floor colors each round, keep eliminated players out of spectator mode, add optional match music

README.md

@@ -114,6 +114,13 @@ work fine from console.
   configured palette) across the whole region and serializes it into the arena's yml file
   (`generated-layout`) so it can be restored exactly, every round, without re-scanning or
   re-randomizing the world.
+- By default the *positions* from that saved layout are reused every round, but which color
+  sits at which position is reshuffled (`floor.shuffle-each-round: true` in `config.yml`) at
+  the start of the match and before every round's restore — so the board isn't a static,
+  memorizable pattern for the whole game. The shuffle only permutes materials in memory; the
+  saved `generated-layout` itself is never modified, so a restart or another `/bp generate`
+  still starts from the original. Set `shuffle-each-round: false` to always restore the exact
+  saved layout unchanged instead.
 
 ### Billboards
 
@@ -149,7 +156,10 @@ nothing leaks.
   target block is placed in your hotbar (slot 9) as a visual reminder. A boss bar (if
   enabled) shows the remaining time as a shrinking progress bar.
 - Get eliminated by not standing on the target color when the floor clears, or by falling
-  off entirely. Eliminated players become spectators at the configured spectator location.
+  off entirely. Eliminated players are teleported to the configured spectator location and
+  marked as spectators for gameplay purposes (no damage, can't interfere), but stay in
+  adventure mode rather than true spectator mode — no noclip/flight, just watching from where
+  they landed.
 - Last player standing wins; rewards, stats and celebration effects (fireworks, titles,
   sounds) fire automatically.
 - **Solo play**: if a match starts with only one player (e.g. `min-players: 1` for testing),
@@ -166,14 +176,34 @@ nothing leaks.
   future/optional batched floor operations — round-end removal and each round's floor reset
   are always instantaneous, all blocks at once, by design),
   `defaults.*` (used only when `/bp create` seeds a new arena), `default-floor-materials`
-  (the full 16-color concrete palette by default), `rewards.winner.commands`, and
-  `integrations.placeholderapi`.
+  (the full 16-color concrete palette by default), `floor.shuffle-each-round`, `music.*`
+  (see "Music" below), `rewards.winner.commands`, and `integrations.placeholderapi`.
 - **`messages.yml`** — every user-facing string, in [MiniMessage](https://docs.advntr.dev/minimessage/format.html)
   format (Adventure, bundled with Paper). Placeholders like `%player%`, `%arena%`, `%round%`,
   `%time%`, `%color%` are substituted per-message.
 - **`arenas/<name>.yml`** — one file per arena; a broken file only disables that one arena
   (the rest still load) and the error is logged.
 
+### Music
+
+Optional background music for the duration of a match, off by default:
+
+```yaml
+music:
+  enabled: true
+  track: MUSIC_DISC_PIGSTEP
+  volume: 1.0
+```
+
+`track` is any Bukkit `Sound` enum name that's actually a track (one of the `MUSIC_DISC_*`
+sounds, or a `MUSIC_*` ambient track) — invalid names are logged and skipped, never crash the
+plugin. It plays on the client's dedicated **Music** volume slider (via `SoundCategory.MUSIC`),
+separately from sound effects, starting when a match begins. It's paused the instant the floor
+wipes each round and resumed once the floor has fully reset for the next round. Note this is a
+stop/replay-from-the-start rather than a true mid-track pause/resume — vanilla Minecraft's sound
+API has no seek/resume-from-position, so each "resume" restarts the track from the beginning.
+It's stopped entirely at match end, arena disable, or plugin shutdown.
+
 ### Reload behavior
 
 `/blockparty reload` re-reads `config.yml`, `messages.yml`, and every arena file. Arenas

src/main/java/us/tss3/blockparty/arena/Arena.java

@@ -117,6 +117,7 @@ public class Arena {
     public void disable() {
         cancelAllTasks();
         billboardManager.despawn();
+        pauseMusic();
         // Force reset players out regardless of state
         List<UUID> all = new ArrayList<>();
         all.addAll(players);
@@ -257,6 +258,9 @@ public class Arena {
         if (!floorManager.hasLayout()) {
             floorManager.generate(random);
         }
+        if (plugin.getConfigManager().isShuffleFloorEachRound()) {
+            floorManager.shuffle(random);
+        }
         floorManager.restoreFull(plugin.getConfigManager().getFloorBatchBlocksPerTick(), () -> {
             Location safeSpawn = safeSpawnLocation();
             for (UUID uuid : players) {
@@ -269,6 +273,7 @@ public class Arena {
                     p.teleport(safeSpawn);
                 }
             }
+            startMusic();
             startNextRound();
         });
     }
@@ -359,6 +364,7 @@ public class Arena {
 
     private void processRoundEnd() {
         playToParticipants("floor-disappear");
+        pauseMusic();
         floorManager.removeNonTarget(currentTarget, plugin.getConfigManager().getFloorBatchBlocksPerTick(), () -> {
             BukkitTask delay = plugin.getServer().getScheduler().runTaskLater(plugin, this::evaluateEliminations,
                     config.getFloorRemoveDelaySeconds() * 20L);
@@ -379,6 +385,36 @@ public class Arena {
         }
     }
 
+    /** Starts the configured background music (if enabled) for every current player/spectator,
+     *  from the beginning of the track — Bukkit has no true "resume from position" API, so
+     *  pause/resume below is implemented as stop/replay-from-start rather than a real seek. */
+    private void startMusic() {
+        if (!plugin.getConfigManager().isMusicEnabled()) {
+            return;
+        }
+        String track = plugin.getConfigManager().getMusicTrack();
+        float volume = plugin.getConfigManager().getMusicVolume();
+        for (UUID uuid : allParticipants()) {
+            Player p = plugin.getServer().getPlayer(uuid);
+            if (p != null) {
+                plugin.getSoundUtil().playMusic(p, track, volume);
+            }
+        }
+    }
+
+    private void pauseMusic() {
+        if (!plugin.getConfigManager().isMusicEnabled()) {
+            return;
+        }
+        String track = plugin.getConfigManager().getMusicTrack();
+        for (UUID uuid : allParticipants()) {
+            Player p = plugin.getServer().getPlayer(uuid);
+            if (p != null) {
+                plugin.getSoundUtil().stopMusic(p, track);
+            }
+        }
+    }
+
     private void evaluateEliminations() {
         List<EliminationLogic.PlayerFloorState<UUID, Material>> states = new ArrayList<>();
         for (UUID uuid : players) {
@@ -418,11 +454,16 @@ public class Arena {
             return;
         }
 
-        BukkitTask restoreDelay = plugin.getServer().getScheduler().runTaskLater(plugin, () ->
+        BukkitTask restoreDelay = plugin.getServer().getScheduler().runTaskLater(plugin, () -> {
+                    if (plugin.getConfigManager().isShuffleFloorEachRound()) {
+                        floorManager.shuffle(random);
+                    }
                     floorManager.restoreFull(plugin.getConfigManager().getFloorBatchBlocksPerTick(), () -> {
                         playToParticipants("round-complete");
+                        startMusic();
                         startNextRound();
-                }),
+                    });
+                },
                 config.getFloorRestoreDelaySeconds() * 20L);
         tasks.add(restoreDelay);
     }
@@ -437,7 +478,11 @@ public class Arena {
             session.setEliminated(true);
         }
         if (p != null) {
-            p.setGameMode(GameMode.SPECTATOR);
+            // Stay in adventure mode rather than true spectator mode (no noclip/flight) -
+            // being physically placed at the spectator location plus the gameplay
+            // restriction listener's damage-cancel for the SPECTATOR role is enough for
+            // them to safely watch without interacting.
+            p.setGameMode(GameMode.ADVENTURE);
             if (config.getSpectator() != null) {
                 p.teleport(config.getSpectator());
             }
@@ -453,6 +498,7 @@ public class Arena {
     private void endMatch(UUID winner) {
         stateMachine.transition(ArenaPhase.ENDING);
         cancelAllTasks();
+        pauseMusic();
         if (winner != null) {
             Player winnerPlayer = plugin.getServer().getPlayer(winner);
             String winnerName = winnerPlayer != null ? winnerPlayer.getName() : "Unknown";
@@ -551,6 +597,7 @@ public class Arena {
     public void shutdown() {
         cancelAllTasks();
         billboardManager.despawn();
+        pauseMusic();
         List<UUID> all = allParticipants();
         for (UUID uuid : all) {
             Player p = plugin.getServer().getPlayer(uuid);

src/main/java/us/tss3/blockparty/config/ConfigManager.java

@@ -93,6 +93,22 @@ public class ConfigManager {
         return config.getInt("performance.floor-blocks-per-tick", 200);
     }
 
+    public boolean isShuffleFloorEachRound() {
+        return config.getBoolean("floor.shuffle-each-round", true);
+    }
+
+    public boolean isMusicEnabled() {
+        return config.getBoolean("music.enabled", false);
+    }
+
+    public String getMusicTrack() {
+        return config.getString("music.track", "MUSIC_DISC_PIGSTEP");
+    }
+
+    public float getMusicVolume() {
+        return (float) config.getDouble("music.volume", 1.0);
+    }
+
     public boolean isPlaceholderApiEnabled() {
         return config.getBoolean("integrations.placeholderapi", true);
     }

src/main/java/us/tss3/blockparty/floor/FloorManager.java

@@ -9,6 +9,7 @@ import us.tss3.blockparty.config.ArenaConfig;
 
 import java.util.ArrayDeque;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Deque;
 import java.util.HashMap;
 import java.util.List;
@@ -89,6 +90,26 @@ public class FloorManager {
         return new ArrayList<>(layout.values());
     }
 
+    /**
+     * Randomly permutes which material sits at which position, without changing the set of
+     * positions or how many blocks of each material exist (so target-color counts/fairness
+     * from {@link #generate} are preserved) — used so the board looks different each round
+     * instead of always restoring to the exact same static pattern. Purely in-memory: the
+     * arena's persisted {@code generated-layout} is left untouched, so a restart or
+     * `/bp generate` still starts from the original saved layout.
+     */
+    public void shuffle(Random random) {
+        if (layout.size() < 2) {
+            return;
+        }
+        List<Material> materials = new ArrayList<>(layout.values());
+        Collections.shuffle(materials, random);
+        List<String> keys = new ArrayList<>(layout.keySet());
+        for (int i = 0; i < keys.size(); i++) {
+            layout.put(keys.get(i), materials.get(i));
+        }
+    }
+
     /**
      * Places every block from the stored layout, all within a single tick, so the floor
      * visibly resets instantly at the start of each round instead of filling in gradually.

src/main/java/us/tss3/blockparty/util/SoundUtil.java

@@ -2,6 +2,7 @@ package us.tss3.blockparty.util;
 
 import org.bukkit.Location;
 import org.bukkit.Sound;
+import org.bukkit.SoundCategory;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.Plugin;
 
@@ -36,6 +37,25 @@ public final class SoundUtil {
         location.getWorld().playSound(location, sound, volume, pitch);
     }
 
+    /** Plays a configured track to a player on the MUSIC category (respects their music
+     *  volume slider independently of SFX), from the start. */
+    public void playMusic(Player player, String soundName, float volume) {
+        Sound sound = resolve(soundName);
+        if (sound == null) {
+            return;
+        }
+        player.playSound(player.getLocation(), sound, SoundCategory.MUSIC, volume, 1f);
+    }
+
+    /** Stops a configured track for a player on the MUSIC category, if currently playing. */
+    public void stopMusic(Player player, String soundName) {
+        Sound sound = resolve(soundName);
+        if (sound == null) {
+            return;
+        }
+        player.stopSound(sound, SoundCategory.MUSIC);
+    }
+
     private Sound resolve(String name) {
         if (name == null || name.isBlank()) {
             return null;

src/main/resources/config.yml

@@ -21,10 +21,27 @@ sounds:
   round-complete: BLOCK_NOTE_BLOCK_BELL
   victory: UI_TOAST_CHALLENGE_COMPLETE
 
+music:
+  # Optional background music for the duration of a match, played on the client's MUSIC
+  # volume slider (separate from sound effects). Off by default since it's a matter of taste.
+  enabled: false
+  # Any Bukkit Sound enum name that's actually a track, e.g. one of the MUSIC_DISC_* sounds
+  # or a MUSIC_* ambient track. Invalid names are logged and skipped, never crash the plugin.
+  track: MUSIC_DISC_PIGSTEP
+  volume: 1.0
+
 performance:
   # blocks processed per server tick when generating/removing/restoring the floor
   floor-blocks-per-tick: 200
 
+floor:
+  # If true (default), the floor's material-to-position layout is randomly reshuffled
+  # (same set of positions and same count of each material, just rearranged) at the start
+  # of the match and before every round restore, so the board isn't a static, memorizable
+  # pattern across the whole game. Purely in-memory - the arena's saved generated-layout
+  # (from /bp generate) is never modified by shuffling.
+  shuffle-each-round: true
+
 # example/default timings used when creating a brand-new arena via /blockparty create
 defaults:
   countdown-duration: 15