Fix destruction behind permeable blocks

Fix destruction wand removing blocks not facing the player

gradle.properties

@@ -11,4 +11,4 @@ mcp_mappings=20200723-1.16.1
 botania=1.16-398
 
 version_major=2
-version_minor=2
+version_minor=4

src/main/java/thetadev/constructionwand/basics/WandUtil.java

@@ -7,12 +7,9 @@ import net.minecraft.entity.Entity;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.BlockItem;
-import net.minecraft.item.BlockItemUseContext;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
-import net.minecraft.state.Property;
-import net.minecraft.state.properties.BlockStateProperties;
-import net.minecraft.state.properties.SlabType;
+import net.minecraft.item.Items;
 import net.minecraft.stats.Stats;
 import net.minecraft.util.Direction;
 import net.minecraft.util.EntityPredicates;
@@ -208,13 +205,19 @@ public class WandUtil
 
     /**
      * Tests if a wand can place a block at a certain position.
-     * This check is independent from the used block.
+     * This check is independent of the used block.
      */
     public static boolean isPositionPlaceable(World world, PlayerEntity player, BlockPos pos, boolean replace) {
         if(!isPositionModifiable(world, player, pos)) return false;
 
         // If replace mode is off, target has to be air
-        return replace || world.isAirBlock(pos);
+        if(world.isAirBlock(pos)) return true;
+
+        // Otherwise, check if the block can be replaced by a generic block
+        return replace && world.getBlockState(pos).isReplaceable(
+                new WandItemUseContext(world, player,
+                        new BlockRayTraceResult(new Vector3d(0, 0, 0), Direction.DOWN, pos, false),
+                        pos, (BlockItem) Items.STONE));
     }
 
     public static boolean isBlockRemovable(World world, PlayerEntity player, BlockPos pos) {
@@ -226,6 +229,10 @@ public class WandUtil
         return true;
     }
 
+    public static boolean isBlockPermeable(World world, BlockPos pos) {
+        return world.isAirBlock(pos) || world.getBlockState(pos).getCollisionShape(world, pos).isEmpty();
+    }
+
     public static boolean entitiesCollidingWithBlock(World world, BlockState blockState, BlockPos pos) {
         VoxelShape shape = blockState.getCollisionShape(world, pos);
         if(!shape.isEmpty()) {

src/main/java/thetadev/constructionwand/wand/action/ActionDestruction.java

@@ -39,14 +39,14 @@ public class ActionDestruction implements IWandAction
         HashSet<BlockPos> allCandidates = new HashSet<>();
 
         // Block face the wand was pointed at
-        Direction breakDirection = rayTraceResult.getFace();
+        Direction breakFace = rayTraceResult.getFace();
         // Block the wand was pointed at
         BlockPos startingPoint = rayTraceResult.getPos();
         BlockState targetBlock = world.getBlockState(rayTraceResult.getPos());
 
         // Is break direction allowed by lock?
         // Tried to break blocks from top/bottom face, so the wand should allow breaking in NS/EW direction
-        if(breakDirection == Direction.UP || breakDirection == Direction.DOWN) {
+        if(breakFace == Direction.UP || breakFace == Direction.DOWN) {
             if(options.testLock(WandOptions.LOCK.NORTHSOUTH) || options.testLock(WandOptions.LOCK.EASTWEST))
                 candidates.add(startingPoint);
         }
@@ -57,6 +57,10 @@ public class ActionDestruction implements IWandAction
         // Process current candidates, stop when none are avaiable or block limit is reached
         while(!candidates.isEmpty() && destroySnapshots.size() < limit) {
             BlockPos currentCandidate = candidates.removeFirst();
+
+            // Only break blocks facing the player, with no collidable blocks in between
+            if(!WandUtil.isBlockPermeable(world, currentCandidate.offset(breakFace))) continue;
+
             try {
                 BlockState candidateBlock = world.getBlockState(currentCandidate);
 
@@ -67,7 +71,7 @@ public class ActionDestruction implements IWandAction
                     if(snapshot == null) continue;
                     destroySnapshots.add(snapshot);
 
-                    switch(breakDirection) {
+                    switch(breakFace) {
                         case DOWN:
                         case UP:
                             if(options.testLock(WandOptions.LOCK.NORTHSOUTH)) {

src/main/java/thetadev/constructionwand/wand/supplier/SupplierInventory.java

@@ -5,6 +5,7 @@ import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.BlockItem;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
 import net.minecraft.util.Hand;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.BlockRayTraceResult;
@@ -51,7 +52,7 @@ public class SupplierInventory implements IWandSupplier
             addBlockItem((BlockItem) offhandStack.getItem());
         }
         // Otherwise use target block
-        else {
+        else if(target != null && target != Items.AIR) {
             addBlockItem(target);
 
             // Add replacement items