From 1c745f43a3547241f23b4b29bfe3596889b21f3f Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Fri, 15 Jan 2021 16:03:05 +0800
Subject: Implement MC-113809 (zero-tick plants farm) reintroduction (for
 cactus).

---
 .../mixin/Mc113809CactusBlockMixin.java            | 95 ++++++++++++++++++++++
 .../mixin/Mc113809SugarCaneBlockMixin.java         |  2 +-
 src/main/resources/ohmyvanillamc.mixins.json       |  3 +-
 3 files changed, 98 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/com/keuin/ohmyvanillamc/mixin/Mc113809CactusBlockMixin.java

diff --git a/src/main/java/com/keuin/ohmyvanillamc/mixin/Mc113809CactusBlockMixin.java b/src/main/java/com/keuin/ohmyvanillamc/mixin/Mc113809CactusBlockMixin.java
new file mode 100644
index 0000000..ea3ddf8
--- /dev/null
+++ b/src/main/java/com/keuin/ohmyvanillamc/mixin/Mc113809CactusBlockMixin.java
@@ -0,0 +1,95 @@
+package com.keuin.ohmyvanillamc.mixin;
+
+import com.keuin.ohmyvanillamc.OhMyVanillaMinecraft;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.CactusBlock;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.state.property.IntProperty;
+import net.minecraft.util.math.BlockPos;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import java.util.Random;
+
+@Mixin(CactusBlock.class)
+public abstract class Mc113809CactusBlockMixin extends Block {
+
+    public Mc113809CactusBlockMixin(Settings settings) {
+        super(settings);
+    }
+
+    @Shadow
+    @Final
+    public static IntProperty AGE;
+
+    /**
+     * Revert to base class (Block) implementation of randomTick: just simply call scheduledTick.
+     * (both 1.15.2 and 1.16.4 are the same)
+     *
+     * @author trueKeuin
+     * @reason revert to the base class `Block` implementation.
+     */
+    @Overwrite
+    public void randomTick(BlockState state, ServerWorld world, BlockPos pos, Random random) {
+        if (OhMyVanillaMinecraft.getConfiguration().isReintroduceZeroTickFarm()) {
+            scheduledTick(state, world, pos, random);
+        } else {
+            // here goes 1.16.4 version randomTick impl.
+            BlockPos blockPos = pos.up();
+            if (world.isAir(blockPos)) {
+                int i;
+                for (i = 1; world.getBlockState(pos.down(i)).isOf(this); ++i) {
+                }
+
+                if (i < 3) {
+                    int j = (Integer) state.get(AGE);
+                    if (j == 15) {
+                        world.setBlockState(blockPos, this.getDefaultState());
+                        BlockState blockState = (BlockState) state.with(AGE, 0);
+                        world.setBlockState(pos, blockState, 4);
+                        blockState.neighborUpdate(world, blockPos, this, pos, false);
+                    } else {
+                        world.setBlockState(pos, (BlockState) state.with(AGE, j + 1), 4);
+                    }
+
+                }
+            }
+        }
+    }
+
+    /**
+     * Reintroduce the MC-113809 glitch for cactus. The implementation is identical to Minecraft 1.15.2.
+     *
+     * @author trueKeuin
+     * @reason reintroduce MC-113809 for cactus.
+     */
+    @Overwrite
+    public void scheduledTick(BlockState state, ServerWorld world, BlockPos pos, Random random) {
+        if (!state.canPlaceAt(world, pos)) {
+            world.breakBlock(pos, true);
+        } else if (OhMyVanillaMinecraft.getConfiguration().isReintroduceZeroTickFarm()) {
+            BlockPos blockPos = pos.up();
+            if (world.isAir(blockPos)) {
+                int i;
+                for (i = 1; world.getBlockState(pos.down(i)).isOf(this); ++i) {
+                }
+
+                if (i < 3) {
+                    int j = (Integer) state.get(AGE);
+                    if (j == 15) {
+                        world.setBlockState(blockPos, this.getDefaultState());
+                        BlockState blockState = (BlockState) state.with(AGE, 0);
+                        world.setBlockState(pos, blockState, 4);
+                        blockState.neighborUpdate(world, blockPos, this, pos, false);
+                    } else {
+                        world.setBlockState(pos, (BlockState) state.with(AGE, j + 1), 4);
+                    }
+
+                }
+            }
+        }
+    }
+}
diff --git a/src/main/java/com/keuin/ohmyvanillamc/mixin/Mc113809SugarCaneBlockMixin.java b/src/main/java/com/keuin/ohmyvanillamc/mixin/Mc113809SugarCaneBlockMixin.java
index 23d4507..63874cc 100644
--- a/src/main/java/com/keuin/ohmyvanillamc/mixin/Mc113809SugarCaneBlockMixin.java
+++ b/src/main/java/com/keuin/ohmyvanillamc/mixin/Mc113809SugarCaneBlockMixin.java
@@ -36,7 +36,7 @@ public abstract class Mc113809SugarCaneBlockMixin extends Block {
     public void randomTick(BlockState state, ServerWorld world, BlockPos pos, Random random) {
         if (OhMyVanillaMinecraft.getConfiguration().isReintroduceZeroTickFarm()) {
             scheduledTick(state, world, pos, random);
-        } else if (world.isAir(pos.up())) {
+        } else if (world.isAir(pos.up())) { // here goes 1.16.4 version randomTick impl.
             int i;
             for (i = 1; world.getBlockState(pos.down(i)).isOf((SugarCaneBlock) (Object) this); ++i) {
             }
diff --git a/src/main/resources/ohmyvanillamc.mixins.json b/src/main/resources/ohmyvanillamc.mixins.json
index 86a0242..09a4bb6 100644
--- a/src/main/resources/ohmyvanillamc.mixins.json
+++ b/src/main/resources/ohmyvanillamc.mixins.json
@@ -9,7 +9,8 @@
     "DisablePhantomSpawning",
     "DisableWanderingTraderSpawning",
     "ReintroduceLlamaItemDuping",
-    "Mc113809SugarCaneBlockMixin"
+    "Mc113809SugarCaneBlockMixin",
+    "Mc113809CactusBlockMixin"
   ],
   "injectors": {
     "defaultRequire": 1
-- 
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