From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <Blake.Galbreath@GMail.com>
Date: Mon, 3 Sep 2018 18:20:03 -0500
Subject: [PATCH] Add ray tracing methods to LivingEntity


diff --git a/src/main/java/net/minecraft/server/MCUtil.java b/src/main/java/net/minecraft/server/MCUtil.java
index 0cf818fceddd76e7704fdc6625456787856b2815..ccdee183f02ab55723e16f41efce55dc51e96297 100644
--- a/src/main/java/net/minecraft/server/MCUtil.java
+++ b/src/main/java/net/minecraft/server/MCUtil.java
@@ -493,6 +493,18 @@ public final class MCUtil {
         return getNMSWorld(entity.getWorld());
     }
 
+    public static ClipContext.Fluid getNMSFluidCollisionOption(com.destroystokyo.paper.block.TargetBlockInfo.FluidMode fluidMode) {
+        switch (fluidMode) {
+            case NEVER:
+                return ClipContext.Fluid.NONE;
+            case SOURCE_ONLY:
+                return ClipContext.Fluid.SOURCE_ONLY;
+            case ALWAYS:
+                return ClipContext.Fluid.ANY;
+        }
+        return null;
+    }
+
     public static BlockFace toBukkitBlockFace(Direction enumDirection) {
         switch (enumDirection) {
             case DOWN:
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index f7a535c35dde266e82369a8cee67c6e58c178731..75f1d666d7e15cfad3935ba3aff6b68b6b6f992a 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3721,6 +3721,23 @@ public abstract class LivingEntity extends Entity {
     }
 
     // Paper start
+    public HitResult getRayTrace(int maxDistance) {
+        return getRayTrace(maxDistance, ClipContext.Fluid.NONE);
+    }
+
+    public HitResult getRayTrace(int maxDistance, ClipContext.Fluid fluidCollisionOption) {
+        if (maxDistance < 1 || maxDistance > 120) {
+            throw new IllegalArgumentException("maxDistance must be between 1-120");
+        }
+
+        Vec3 start = new Vec3(getX(), getY() + getEyeHeight(), getZ());
+        org.bukkit.util.Vector dir = getBukkitEntity().getLocation().getDirection().multiply(maxDistance);
+        Vec3 end = new Vec3(start.x + dir.getX(), start.y + dir.getY(), start.z + dir.getZ());
+        ClipContext raytrace = new ClipContext(start, end, ClipContext.Block.OUTLINE, fluidCollisionOption, this);
+
+        return level.clip(raytrace);
+    }
+
     public int shieldBlockingDelay = level.paperConfig().misc.shieldBlockingDelay;
 
     public int getShieldBlockingDelay() {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
index 5c517025576461b426b4a73eea4369f00aeeee41..9c024b46522e2984ed662538302fbac68a77fd86 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -198,6 +198,28 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         return blocks.get(0);
     }
 
+    // Paper start
+    @Override
+    public Block getTargetBlock(int maxDistance, com.destroystokyo.paper.block.TargetBlockInfo.FluidMode fluidMode) {
+        net.minecraft.world.phys.HitResult rayTrace = getHandle().getRayTrace(maxDistance, net.minecraft.server.MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof net.minecraft.world.phys.BlockHitResult) ? null : org.bukkit.craftbukkit.block.CraftBlock.at(getHandle().level, ((net.minecraft.world.phys.BlockHitResult)rayTrace).getBlockPos());
+    }
+
+    @Override
+    public org.bukkit.block.BlockFace getTargetBlockFace(int maxDistance, com.destroystokyo.paper.block.TargetBlockInfo.FluidMode fluidMode) {
+        net.minecraft.world.phys.HitResult rayTrace = getHandle().getRayTrace(maxDistance, net.minecraft.server.MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof net.minecraft.world.phys.BlockHitResult) ? null : net.minecraft.server.MCUtil.toBukkitBlockFace(((net.minecraft.world.phys.BlockHitResult)rayTrace).getDirection());
+    }
+
+    @Override
+    public com.destroystokyo.paper.block.TargetBlockInfo getTargetBlockInfo(int maxDistance, com.destroystokyo.paper.block.TargetBlockInfo.FluidMode fluidMode) {
+        net.minecraft.world.phys.HitResult rayTrace = getHandle().getRayTrace(maxDistance, net.minecraft.server.MCUtil.getNMSFluidCollisionOption(fluidMode));
+        return !(rayTrace instanceof net.minecraft.world.phys.BlockHitResult) ? null :
+            new com.destroystokyo.paper.block.TargetBlockInfo(org.bukkit.craftbukkit.block.CraftBlock.at(getHandle().level, ((net.minecraft.world.phys.BlockHitResult)rayTrace).getBlockPos()),
+                net.minecraft.server.MCUtil.toBukkitBlockFace(((net.minecraft.world.phys.BlockHitResult)rayTrace).getDirection()));
+    }
+    // Paper end
+
     @Override
     public List<Block> getLastTwoTargetBlocks(Set<Material> transparent, int maxDistance) {
         return this.getLineOfSight(transparent, maxDistance, 2);