From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samsuik <kfian294ma4@gmail.com>
Date: Sun, 9 Feb 2025 17:52:59 +0000
Subject: [PATCH] Track block changes and level tick scheduler


diff --git a/net/minecraft/server/MinecraftServer.java b/net/minecraft/server/MinecraftServer.java
index 40c906959d2708bf3e589f8e8d541d47106a8465..b234215e59ac303ef7979031ab1b042ff6692b7a 100644
--- a/net/minecraft/server/MinecraftServer.java
+++ b/net/minecraft/server/MinecraftServer.java
@@ -1747,6 +1747,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             profilerFiller.pop();
             profilerFiller.pop();
             serverLevel.explosionDensityCache.clear(); // Paper - Optimize explosions
+            serverLevel.levelTickScheduler.levelTick(serverLevel); // Sakura - level tick and block change listeners
         }
         this.isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
 
diff --git a/net/minecraft/world/level/Level.java b/net/minecraft/world/level/Level.java
index 787d7a76af7dfcaaa4b329df2cbe7cfcaa83d572..8aea98378fccb14f3eadab72a38e5661806b96c0 100644
--- a/net/minecraft/world/level/Level.java
+++ b/net/minecraft/world/level/Level.java
@@ -824,6 +824,10 @@ public abstract class Level implements LevelAccessor, UUIDLookup<Entity>, AutoCl
         return chunk != null ? chunk.getNoiseBiome(x, y, z) : this.getUncachedNoiseBiome(x, y, z);
     }
     // Paper end - optimise random ticking
+    // Sakura start - track block changes and tick scheduler
+    public final me.samsuik.sakura.listener.LevelTickScheduler levelTickScheduler = new me.samsuik.sakura.listener.LevelTickScheduler();
+    public final me.samsuik.sakura.listener.BlockChangeTracker blockChangeTracker = new me.samsuik.sakura.listener.BlockChangeTracker(this);
+    // Sakura end - track block changes and tick scheduler
 
     protected Level(
         WritableLevelData levelData,
diff --git a/net/minecraft/world/level/chunk/LevelChunk.java b/net/minecraft/world/level/chunk/LevelChunk.java
index 5d3fc807221392d378fec283bfdefb8747fb8376..cfc125d43cf3702d46c221f4e7b0d66a15c5d690 100644
--- a/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/net/minecraft/world/level/chunk/LevelChunk.java
@@ -127,6 +127,21 @@ public class LevelChunk extends ChunkAccess implements ca.spottedleaf.moonrise.p
         return this.getBlockStateFinal(x, y, z);
     }
     // Paper end - get block chunk optimisation
+    // Sakura start - track block changes and tick scheduler
+    private java.util.List<me.samsuik.sakura.listener.BlockChangeTracker.Listener> blockChangeListeners;
+
+    public final void updateBlockChangeListeners(java.util.List<me.samsuik.sakura.listener.BlockChangeTracker.Listener> listeners) {
+        this.blockChangeListeners = listeners;
+    }
+
+    private void blockChange(BlockPos pos, BlockState newBlock, BlockState oldBlock) {
+        for (me.samsuik.sakura.listener.BlockChangeTracker.Listener listener : this.blockChangeListeners) {
+            if (listener.test(this.level, pos, newBlock, oldBlock)) {
+                listener.call();
+            }
+        }
+    }
+    // Sakura end - track block changes and tick scheduler
 
     public LevelChunk(Level level, ChunkPos pos) {
         this(level, pos, UpgradeData.EMPTY, new LevelChunkTicks<>(), new LevelChunkTicks<>(), 0L, null, null, null);
@@ -164,6 +179,7 @@ public class LevelChunk extends ChunkAccess implements ca.spottedleaf.moonrise.p
         this.debug = !empty && this.level.isDebug();
         this.defaultBlockState = empty ? VOID_AIR_BLOCKSTATE : AIR_BLOCKSTATE;
         // Paper end - get block chunk optimisation
+        this.blockChangeListeners = level.blockChangeTracker.getListenersForChunk(pos); // Sakura - track block changes and tick scheduler
     }
 
     public LevelChunk(ServerLevel level, ProtoChunk chunk, @Nullable LevelChunk.PostLoadProcessor postLoad) {
@@ -412,6 +428,11 @@ public class LevelChunk extends ChunkAccess implements ca.spottedleaf.moonrise.p
                 if (!section.getBlockState(i, i1, i2).is(block)) {
                     return null;
                 } else {
+                    // Sakura start - track block changes and tick scheduler
+                    if (state.getBlock() != blockState.getBlock()) {
+                        this.blockChange(pos, state, blockState);
+                    }
+                    // Sakura end - track block changes and tick scheduler
                     if (!this.level.isClientSide && (flags & 512) == 0 && (!this.level.captureBlockStates || block instanceof net.minecraft.world.level.block.BaseEntityBlock)) { // CraftBukkit - Don't place while processing the BlockPlaceEvent, unless it's a BlockContainer. Prevents blocks such as TNT from activating when cancelled.
                         state.onPlace(this.level, pos, blockState, flag1);
                     }