From f51aa3e3e1235d160f71fbfec8284c8327bf00ab Mon Sep 17 00:00:00 2001
From: Lulu13022002 <41980282+Lulu13022002@users.noreply.github.com>
Date: Thu, 26 Dec 2024 19:42:03 +0100
Subject: [PATCH] Fix BlockRedstoneEvent for tripwire hooks (#11791)

---
 .../level/block/TripWireHookBlock.java.patch  | 62 ++++++++++++++++---
 1 file changed, 53 insertions(+), 9 deletions(-)

diff --git a/paper-server/patches/sources/net/minecraft/world/level/block/TripWireHookBlock.java.patch b/paper-server/patches/sources/net/minecraft/world/level/block/TripWireHookBlock.java.patch
index 661176a03d..225f53b419 100644
--- a/paper-server/patches/sources/net/minecraft/world/level/block/TripWireHookBlock.java.patch
+++ b/paper-server/patches/sources/net/minecraft/world/level/block/TripWireHookBlock.java.patch
@@ -1,21 +1,65 @@
 --- a/net/minecraft/world/level/block/TripWireHookBlock.java
 +++ b/net/minecraft/world/level/block/TripWireHookBlock.java
-@@ -173,9 +_,18 @@
+@@ -127,10 +_,10 @@
+         if (optionalValue.isPresent()) {
+             Direction direction = optionalValue.get();
+             boolean flag = hookState.getOptionalValue(ATTACHED).orElse(false);
+-            boolean flag1 = hookState.getOptionalValue(POWERED).orElse(false);
++            boolean flag1 = hookState.getOptionalValue(POWERED).orElse(false); // Paper - diff on change, for event below
+             Block block = hookState.getBlock();
+             boolean flag2 = !attaching;
+-            boolean flag3 = false;
++            boolean flag3 = false; // Paper - diff on change, for event below
+             int i = 0;
+             BlockState[] blockStates = new BlockState[42];
+ 
+@@ -166,21 +_,48 @@
+             flag2 &= i > 1;
+             flag3 &= flag2;
+             BlockState blockState1 = block.defaultBlockState().trySetValue(ATTACHED, Boolean.valueOf(flag2)).trySetValue(POWERED, Boolean.valueOf(flag3));
++            boolean cancelledEmitterHook = false, cancelledReceiverHook = false; // Paper - Call BlockRedstoneEvent
++            boolean wasPowered = flag1, willBePowered = flag3; // Paper - OBFHELPER
+             if (i > 0) {
+                 BlockPos blockPosx = pos.relative(direction, i);
++                // Paper start - Call BlockRedstoneEvent
++                if (wasPowered != willBePowered) {
++                    int newCurrent = willBePowered ? 15 : 0;
++                    org.bukkit.event.block.BlockRedstoneEvent event = new org.bukkit.event.block.BlockRedstoneEvent(
++                        org.bukkit.craftbukkit.block.CraftBlock.at(level, blockPosx), wasPowered ? 15 : 0, newCurrent
++                    );
++                    event.callEvent();
++                    cancelledReceiverHook = event.getNewCurrent() != newCurrent;
++                }
++                if (!cancelledReceiverHook) { // always trigger two events even when the first hook current change is cancelled
++                // Paper end - Call BlockRedstoneEvent
+                 Direction opposite = direction.getOpposite();
+                 level.setBlock(blockPosx, blockState1.setValue(FACING, opposite), 3);
                  notifyNeighbors(block, level, blockPosx, opposite);
                  emitState(level, blockPosx, flag2, flag3, flag, flag1);
-             }
-+            // CraftBukkit start
-+            org.bukkit.event.block.BlockRedstoneEvent eventRedstone = new org.bukkit.event.block.BlockRedstoneEvent(org.bukkit.craftbukkit.block.CraftBlock.at(level, pos), 15, 0);
-+            level.getCraftServer().getPluginManager().callEvent(eventRedstone);
-+
-+            if (eventRedstone.getNewCurrent() > 0) {
-+                return;
+-            }
++                } // Paper - Call BlockRedstoneEvent
 +            }
-+            // CraftBukkit end
++            // Paper start - Call BlockRedstoneEvent
++            if (wasPowered != willBePowered) {
++                int newCurrent = willBePowered ? 15 : 0;
++                org.bukkit.event.block.BlockRedstoneEvent event = new org.bukkit.event.block.BlockRedstoneEvent(
++                    org.bukkit.craftbukkit.block.CraftBlock.at(level, pos), wasPowered ? 15 : 0, newCurrent
++                );
++                event.callEvent();
++                cancelledEmitterHook = event.getNewCurrent() != newCurrent;
++            }
++            // Paper end - Call BlockRedstoneEvent
  
++            if (!cancelledEmitterHook) { // Paper - Call BlockRedstoneEvent
              emitState(level, pos, flag2, flag3, flag, flag1);
              if (!attaching) {
 +                if (level.getBlockState(pos).is(Blocks.TRIPWIRE_HOOK)) // Paper - Validate tripwire hook placement before update
                  level.setBlock(pos, blockState1.setValue(FACING, direction), 3);
                  if (shouldNotifyNeighbours) {
                      notifyNeighbors(block, level, pos, direction);
+                 }
+             }
++            } // Paper - Call BlockRedstoneEvent
+ 
+             if (flag != flag2) {
+                 for (int i2 = 1; i2 < i; i2++) {