From 83a6307788361ec39d1a81c903776bb380dcd7cb Mon Sep 17 00:00:00 2001
From: Bjarne Koll <git@lynxplay.dev>
Date: Sat, 6 Nov 2021 23:15:20 +0100
Subject: [PATCH] Fix setPatternColor on tropical fish bucket meta

Prior to this commit, the tropical fish bucket meta would set the body
color to the previous metas pattern colour when updating the pattern
colour.

This commit hence simply fixes this by using the proper body colour
value when updating the pattern color.
---
 .../CraftMetaTropicalFishBucket.java          |  2 +-
 .../CraftMetaTropicalFishBucketTest.java      | 41 +++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 paper-server/src/test/java/io/papermc/paper/inventory/CraftMetaTropicalFishBucketTest.java

diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaTropicalFishBucket.java b/paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaTropicalFishBucket.java
index 8169d08c1..a514fe98d 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaTropicalFishBucket.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaTropicalFishBucket.java
@@ -128,7 +128,7 @@ class CraftMetaTropicalFishBucket extends CraftMetaItem implements TropicalFishB
         if (this.variant == null) {
             this.variant = 0;
         }
-        this.variant = CraftTropicalFish.getData(color, this.getPatternColor(), this.getPattern());
+        this.variant = CraftTropicalFish.getData(color, this.getBodyColor(), this.getPattern()); // Paper - properly set tropical fish pattern color without mutating body color
     }
 
     @Override
diff --git a/paper-server/src/test/java/io/papermc/paper/inventory/CraftMetaTropicalFishBucketTest.java b/paper-server/src/test/java/io/papermc/paper/inventory/CraftMetaTropicalFishBucketTest.java
new file mode 100644
index 000000000..68a557ced
--- /dev/null
+++ b/paper-server/src/test/java/io/papermc/paper/inventory/CraftMetaTropicalFishBucketTest.java
@@ -0,0 +1,41 @@
+package io.papermc.paper.inventory;
+
+import org.bukkit.DyeColor;
+import org.bukkit.Material;
+import org.bukkit.entity.TropicalFish;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.TropicalFishBucketMeta;
+import org.bukkit.support.environment.AllFeatures;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+@AllFeatures
+public class CraftMetaTropicalFishBucketTest {
+
+    @Test
+    public void testAllCombinations() {
+        final var rawMeta = new ItemStack(Material.TROPICAL_FISH_BUCKET).getItemMeta();
+        Assertions.assertTrue(rawMeta instanceof TropicalFishBucketMeta, "Meta was not a tropical fish bucket");
+
+        final var meta = (TropicalFishBucketMeta) rawMeta;
+
+        for (final var bodyColor : DyeColor.values()) {
+            for (final var pattern : TropicalFish.Pattern.values()) {
+                for (final var patternColor : DyeColor.values()) {
+                    meta.setBodyColor(bodyColor);
+                    Assertions.assertEquals(bodyColor, meta.getBodyColor(), "Body color did not match post body color!");
+
+                    meta.setPattern(pattern);
+                    Assertions.assertEquals(pattern, meta.getPattern(), "Pattern did not match post pattern!");
+                    Assertions.assertEquals(bodyColor, meta.getBodyColor(), "Body color did not match post pattern!");
+
+                    meta.setPatternColor(patternColor);
+                    Assertions.assertEquals(pattern, meta.getPattern(), "Pattern did not match post pattern color!");
+                    Assertions.assertEquals(bodyColor, meta.getBodyColor(), "Body color did not match post pattern color!");
+                    Assertions.assertEquals(patternColor, meta.getPatternColor(), "Pattern color did not match post pattern color!");
+                }
+            }
+        }
+    }
+
+}