cool stuff i think

src/main/java/pl/piecuu/invisninja/InvisNinja.java

@@ -1,5 +1,8 @@
 package pl.piecuu.invisninja;
 
+import java.util.Random;
+import java.util.UUID;
+
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Player;
@@ -11,11 +14,55 @@ import org.bukkit.potion.PotionEffectType;
 
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TextReplacementConfig;
+import net.kyori.adventure.text.format.TextColor;
 import net.kyori.adventure.text.format.TextDecoration;
+import net.kyori.adventure.util.HSVLike;
 
 public class InvisNinja extends JavaPlugin implements Listener {
+  private long bootSeed = 0L;
+  public long getBootSeed() {
+    return this.bootSeed;
+  }
+
+  private static long fmix64(long k) {
+    k ^= k >>> 33;
+    k *= 0xff51afd7ed558ccdL;
+    k ^= k >>> 33;
+    k *= 0xc4ceb9fe1a85ec53L;
+    k ^= k >>> 33;
+    return k;
+  }
+
+  private static long combineMurmur(long a, long b, long c) {
+    long h = a;
+    h = h * 0x9E3779B97F4A7C15L + b;
+    h = fmix64(h ^ c);
+    return h;
+  }
+
+  public static long getPerPlayerSeed(UUID playerUniqueId, long seed) {
+    final long lower = playerUniqueId.getLeastSignificantBits();
+    final long higher = playerUniqueId.getMostSignificantBits();
+
+    return combineMurmur(lower, higher, seed);
+  }
+
+  private static HSVLike hsvFromLong(long seed) {
+    long mix = seed ^ (seed >>> 32);
+    int hueDeg = (int)Math.floorMod(mix, 360L);
+    int b1 = (int)((mix >>> 8) & 0xFF);
+    int b2 = (int)((mix >>> 16) & 0xFF);
+
+    float hue = hueDeg / 360f;
+    float sat = 0.6f + (b1 / 255f) * 0.35f;
+    float val = 0.75f + (b2 / 255f) * 0.25f;
+
+    return HSVLike.hsvLike(hue, sat, val);
+  }
+
   @Override
   public void onEnable() {
+    this.bootSeed = new java.security.SecureRandom().nextLong();
     Bukkit.getPluginManager().registerEvents(this, this);
   }
 
@@ -24,11 +71,22 @@ public class InvisNinja extends JavaPlugin implements Listener {
     Entity en = e.getDamageSource().getCausingEntity();
     if(!(en instanceof Player p)) return;
     if(!isPlayerInvisible(p)) return;
+    
+    long seed = InvisNinja.getPerPlayerSeed(p.getUniqueId(), this.getBootSeed());
+    Random rand = new Random(seed);
+
+    final int max = 16;
+    final int min = 5;
+    final int randomNameLength = rand.nextInt((max - min) + 1) + min; // 5-16
 
     Component newMessage = e.deathMessage()
       .replaceText(TextReplacementConfig.builder()
         .match(p.getName())
-        .replacement(Component.text("aaaaaaaaaaaaa").decoration(TextDecoration.OBFUSCATED, true))
+        .replacement(
+          Component.text("a".repeat(randomNameLength))
+          .decoration(TextDecoration.OBFUSCATED, true)
+          .color(TextColor.color(InvisNinja.hsvFromLong(seed)))
+        )
         .build()
       );
     e.deathMessage(newMessage);