Paper/patches/server/0691-Add-methods-to-find-targets-for-lightning-strikes.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jakub Zacek <dawon@dawon.eu>
Date: Mon, 4 Oct 2021 10:16:44 +0200
Subject: [PATCH] Add methods to find targets for lightning strikes

== AT ==
public net.minecraft.server.level.ServerLevel findLightningRod(Lnet/minecraft/core/BlockPos;)Ljava/util/Optional;

diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 0fcee6adcb99f142bd35d57a65026fc7175c8168..b1f0d64d8d40e7f9b2b0e7702e70853cd70387ac 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -815,6 +815,11 @@ public class ServerLevel extends Level implements WorldGenLevel {
     }
 
     protected BlockPos findLightningTargetAround(BlockPos pos) {
+        // Paper start
+        return this.findLightningTargetAround(pos, false);
+    }
+    public BlockPos findLightningTargetAround(BlockPos pos, boolean returnNullWhenNoTarget) {
+        // Paper end
         BlockPos blockposition1 = this.getHeightmapPos(Heightmap.Types.MOTION_BLOCKING, pos);
         Optional<BlockPos> optional = this.findLightningRod(blockposition1);
 
@@ -829,6 +834,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
             if (!list.isEmpty()) {
                 return ((LivingEntity) list.get(this.random.nextInt(list.size()))).blockPosition();
             } else {
+                if (returnNullWhenNoTarget) return null; // Paper
                 if (blockposition1.getY() == this.getMinBuildHeight() - 1) {
                     blockposition1 = blockposition1.above(2);
                 }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 684e091e7eb68a3e9157e7b945248821553a03df..ef1b84c52722e33f1f3d346df60c11d5bb805a0b 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -686,6 +686,23 @@ public class CraftWorld extends CraftRegionAccessor implements World {
         return (LightningStrike) lightning.getBukkitEntity();
     }
 
+    // Paper start
+    @Override
+    public Location findLightningRod(Location location) {
+        return this.world.findLightningRod(io.papermc.paper.util.MCUtil.toBlockPosition(location))
+            .map(blockPos -> io.papermc.paper.util.MCUtil.toLocation(this.world, blockPos)
+                // get the actual rod pos
+                .subtract(0, 1, 0))
+            .orElse(null);
+    }
+
+    @Override
+    public Location findLightningTarget(Location location) {
+        final BlockPos pos = this.world.findLightningTargetAround(io.papermc.paper.util.MCUtil.toBlockPosition(location), true);
+        return pos == null ? null : io.papermc.paper.util.MCUtil.toLocation(this.world, pos);
+    }
+    // Paper end
+
     @Override
     public boolean generateTree(Location loc, TreeType type) {
         return generateTree(loc, CraftWorld.rand, type);