content: package org.allaymc.server.block.component;
  
  import com.google.common.collect.BiMap;
  import com.google.common.collect.EnumBiMap;
  import org.allaymc.api.block.BlockBehavior;
  import org.allaymc.api.block.data.BlockFace;
  import org.allaymc.api.block.dto.Block;
  import org.allaymc.api.block.dto.PlayerInteractInfo;
  import org.allaymc.api.block.property.enums.TorchFacingDirection;
  import org.allaymc.api.block.property.type.BlockPropertyTypes;
  import org.allaymc.api.block.type.BlockState;
  import org.allaymc.api.block.type.BlockType;
  import org.allaymc.api.world.Dimension;
  import org.joml.Vector3ic;
  
  /**
   * @author daoge_cmd
   */
  public class BlockTorchBaseComponentImpl extends BlockBaseComponentImpl {
      private static final BiMap<BlockFace, TorchFacingDirection> TORCH_FACING_DIRECTION_MAPPER = EnumBiMap.create(BlockFace.class, TorchFacingDirection.class);
  
      static {
          TORCH_FACING_DIRECTION_MAPPER.put(BlockFace.DOWN, TorchFacingDirection.UNKNOWN);
          TORCH_FACING_DIRECTION_MAPPER.put(BlockFace.UP, TorchFacingDirection.TOP);
          TORCH_FACING_DIRECTION_MAPPER.put(BlockFace.NORTH, TorchFacingDirection.SOUTH);
          TORCH_FACING_DIRECTION_MAPPER.put(BlockFace.SOUTH, TorchFacingDirection.NORTH);
          TORCH_FACING_DIRECTION_MAPPER.put(BlockFace.WEST, TorchFacingDirection.EAST);
          TORCH_FACING_DIRECTION_MAPPER.put(BlockFace.EAST, TorchFacingDirection.WEST);
      }
  
      public BlockTorchBaseComponentImpl(BlockType<? extends BlockBehavior> blockType) {
          super(blockType);
      }
  
      @Override
      public void onNeighborUpdate(Block block, Block neighbor, BlockFace face) {
          super.onNeighborUpdate(block, neighbor, face);
  
          if (face == BlockFace.UP) {
              return;
          }
  
          var torchFacingDirection = block.getPropertyValue(BlockPropertyTypes.TORCH_FACING_DIRECTION);
          var blockFace = TORCH_FACING_DIRECTION_MAPPER.inverse().get(torchFacingDirection);
          if (!canBeSupportedAt(block.offsetPos(blockFace.opposite()).getBlockState(), blockFace)) {
              block.breakBlock();
          }
      }
  
      @Override
      public boolean place(Dimension dimension, BlockState blockState, Vector3ic placeBlockPos, PlayerInteractInfo placementInfo) {
          if (placementInfo == null) {
              return dimension.setBlockState(placeBlockPos.x(), placeBlockPos.y(), placeBlockPos.z(), blockState);
          }
  
          var face = placementInfo.blockFace();
          if (face == BlockFace.DOWN || !canBeSupportedAt(placementInfo.getClickedBlock().getBlockState(), face)) {
              face = findValidFace(dimension, placeBlockPos);
          }
  
          if (face == null) {
              return false;
          }
  
          blockState = blockState.setPropertyValue(BlockPropertyTypes.TORCH_FACING_DIRECTION, TORCH_FACING_DIRECTION_MAPPER.get(face));
          return dimension.setBlockState(placeBlockPos.x(), placeBlockPos.y(), placeBlockPos.z(), blockState, placementInfo);
      }
  
      private BlockFace findValidFace(Dimension dimension, Vector3ic placeBlockPos) {
          for (var face : new BlockFace[]{BlockFace.SOUTH, BlockFace.WEST, BlockFace.NORTH, BlockFace.EAST, BlockFace.DOWN}) {
              if (canBeSupportedAt(dimension.getBlockState(face.offsetPos(placeBlockPos)), face.opposite())) {
                  return face.opposite();
              }
          }
  
          return null;
      }
  
      private boolean canBeSupportedAt(BlockState blockState, BlockFace face) {
          var shape = blockState.getBlockStateData().collisionShape();
          return face == BlockFace.UP ? shape.isCenterFull(BlockFace.UP) : shape.isFull(face);
      }
  }
  