From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: violetc <58360096+s-yh-china@users.noreply.github.com>
Date: Thu, 8 Dec 2022 19:40:00 +0800
Subject: [PATCH] Carpet alternative block placement Protocol


diff --git a/src/main/java/net/minecraft/world/level/block/Block.java b/src/main/java/net/minecraft/world/level/block/Block.java
index 2e65b44f10aeb44fd524a58e7eb815a566c1ad61..297362092ea445f885036b716aca2962c13ec12d 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -431,6 +431,14 @@ public class Block extends BlockBehaviour implements ItemLike {
 
     @Nullable
     public BlockState getStateForPlacement(BlockPlaceContext ctx) {
+        // Leaves start - carpetAlternativeBlockPlacement
+        if (top.leavesmc.leaves.LeavesConfig.carpetAlternativeBlockPlacement) {
+            BlockState tryState = top.leavesmc.leaves.protocol.CarpetAlternativeBlockPlacement.alternativeBlockPlacement(this, ctx);
+            if (tryState != null) {
+                return tryState;
+            }
+        }
+        // Leaves end - carpetAlternativeBlockPlacement
         return this.defaultBlockState();
     }
 
diff --git a/src/main/java/top/leavesmc/leaves/LeavesConfig.java b/src/main/java/top/leavesmc/leaves/LeavesConfig.java
index 88544d0972e0f1d4339b8a5da8085c0643b799d5..63c493186334a18d531e9319d79b81304d1c47c7 100644
--- a/src/main/java/top/leavesmc/leaves/LeavesConfig.java
+++ b/src/main/java/top/leavesmc/leaves/LeavesConfig.java
@@ -422,6 +422,11 @@ public final class LeavesConfig {
         jadeProtocol = getBoolean("settings.protocol.jade-protocol", jadeProtocol);
     }
 
+    public static boolean carpetAlternativeBlockPlacement = false;
+    private static void carpetAlternativeBlockPlacement() {
+        carpetAlternativeBlockPlacement = getBoolean("settings.protocol.carpet-alternative-block-placement", carpetAlternativeBlockPlacement);
+    }
+
     public static final class WorldConfig {
 
         public final String worldName;
diff --git a/src/main/java/top/leavesmc/leaves/protocol/CarpetAlternativeBlockPlacement.java b/src/main/java/top/leavesmc/leaves/protocol/CarpetAlternativeBlockPlacement.java
new file mode 100644
index 0000000000000000000000000000000000000000..0acf11f841a938aabb933c82b5e1bdf52a64d30c
--- /dev/null
+++ b/src/main/java/top/leavesmc/leaves/protocol/CarpetAlternativeBlockPlacement.java
@@ -0,0 +1,101 @@
+package top.leavesmc.leaves.protocol;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.block.BedBlock;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.ComparatorBlock;
+import net.minecraft.world.level.block.RepeaterBlock;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.block.state.properties.ComparatorMode;
+import net.minecraft.world.level.block.state.properties.DirectionProperty;
+import net.minecraft.world.level.block.state.properties.Half;
+import net.minecraft.world.level.block.state.properties.Property;
+import net.minecraft.world.level.block.state.properties.SlabType;
+import net.minecraft.world.phys.Vec3;
+import org.jetbrains.annotations.NotNull;
+
+import javax.annotation.Nullable;
+
+public class CarpetAlternativeBlockPlacement {
+
+    @Nullable
+    public static BlockState alternativeBlockPlacement(@NotNull Block block, @NotNull BlockPlaceContext context) {
+        Vec3 hitPos = context.getClickLocation();
+        BlockPos blockPos = context.getClickedPos();
+        double relativeHitX = hitPos.x - blockPos.getX();
+        BlockState state = block.getStateForPlacement(context);
+
+        if (relativeHitX < 2 || state == null) {
+            return null;
+        }
+
+        DirectionProperty directionProp = getFirstDirectionProperty(state);
+        int protocolValue = ((int) relativeHitX - 2) / 2;
+
+        if (directionProp != null) {
+            Direction origFacing = state.getValue(directionProp);
+            Direction facing = origFacing;
+            int facingIndex = protocolValue & 0xF;
+
+            if (facingIndex == 6) {
+                facing = facing.getOpposite();
+            } else if (facingIndex <= 5) {
+                facing = Direction.from3DDataValue(facingIndex);
+            }
+
+            if (!directionProp.getPossibleValues().contains(facing)) {
+                facing = context.getPlayer().getDirection().getOpposite(); // may
+            }
+
+            if (facing != origFacing && directionProp.getPossibleValues().contains(facing)) {
+                if (state.getBlock() instanceof BedBlock) {
+                    BlockPos headPos = blockPos.offset(facing.getNormal()); // really?
+
+                    if (!context.getLevel().getBlockState(headPos).canBeReplaced(context)) {
+                        return null;
+                    }
+                }
+
+                state = state.setValue(directionProp, facing);
+            }
+        } else if (state.hasProperty(BlockStateProperties.AXIS)) {
+            Direction.Axis axis = Direction.Axis.VALUES[protocolValue % 3];
+            state = state.setValue(BlockStateProperties.AXIS, axis);
+        }
+
+        protocolValue &= 0xFFFFFFF0;
+
+        if (protocolValue >= 16) {
+            if (block instanceof RepeaterBlock) {
+                Integer delay = (protocolValue / 16);
+
+                if (RepeaterBlock.DELAY.getPossibleValues().contains(delay)) {
+                    state = state.setValue(RepeaterBlock.DELAY, delay);
+                }
+            } else if (protocolValue == 16) {
+                if (block instanceof ComparatorBlock) {
+                    state = state.setValue(ComparatorBlock.MODE, ComparatorMode.SUBTRACT);
+                } else if (state.hasProperty(BlockStateProperties.HALF) && state.getValue(BlockStateProperties.HALF) == Half.BOTTOM) {
+                    state = state.setValue(BlockStateProperties.HALF, Half.TOP);
+                } else if (state.hasProperty(BlockStateProperties.SLAB_TYPE) && state.getValue(BlockStateProperties.SLAB_TYPE) == SlabType.BOTTOM) {
+                    state = state.setValue(BlockStateProperties.SLAB_TYPE, SlabType.TOP);
+                }
+            }
+        }
+
+        return state;
+    }
+
+    @Nullable
+    public static DirectionProperty getFirstDirectionProperty(@NotNull BlockState state) {
+        for (Property<?> prop : state.getProperties()) {
+            if (prop instanceof DirectionProperty) {
+                return (DirectionProperty) prop;
+            }
+        }
+        return null;
+    }
+}