package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.tags.FluidTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.context.BlockPlaceContext;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.LevelAccessor;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.ScheduledTickAccess;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.StateDefinition;
import net.minecraft.world.level.block.state.properties.BlockStateProperties;
import net.minecraft.world.level.block.state.properties.BooleanProperty;
import net.minecraft.world.level.block.state.properties.EnumProperty;
import net.minecraft.world.level.block.state.properties.SlabType;
import net.minecraft.world.level.material.Fluid;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.material.Fluids;
import net.minecraft.world.level.pathfinder.PathComputationType;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.Shapes;
import net.minecraft.world.phys.shapes.VoxelShape;
import org.jspecify.annotations.Nullable;

public class SlabBlock extends Block implements SimpleWaterloggedBlock {
	public static final MapCodec<SlabBlock> CODEC = simpleCodec(SlabBlock::new);
	public static final EnumProperty<SlabType> TYPE = BlockStateProperties.SLAB_TYPE;
	public static final BooleanProperty WATERLOGGED = BlockStateProperties.WATERLOGGED;
	private static final VoxelShape SHAPE_BOTTOM = Block.column(16.0, 0.0, 8.0);
	private static final VoxelShape SHAPE_TOP = Block.column(16.0, 8.0, 16.0);

	@Override
	public MapCodec<? extends SlabBlock> codec() {
		return CODEC;
	}

	public SlabBlock(final BlockBehaviour.Properties properties) {
		super(properties);
		this.registerDefaultState(this.defaultBlockState().setValue(TYPE, SlabType.BOTTOM).setValue(WATERLOGGED, false));
	}

	@Override
	protected boolean useShapeForLightOcclusion(final BlockState state) {
		return state.getValue(TYPE) != SlabType.DOUBLE;
	}

	@Override
	protected void createBlockStateDefinition(final StateDefinition.Builder<Block, BlockState> builder) {
		builder.add(TYPE, WATERLOGGED);
	}

	@Override
	protected VoxelShape getShape(final BlockState state, final BlockGetter level, final BlockPos pos, final CollisionContext context) {
		return switch ((SlabType)state.getValue(TYPE)) {
			case TOP -> SHAPE_TOP;
			case BOTTOM -> SHAPE_BOTTOM;
			case DOUBLE -> Shapes.block();
		};
	}

	@Nullable
	@Override
	public BlockState getStateForPlacement(final BlockPlaceContext context) {
		BlockPos pos = context.getClickedPos();
		BlockState replacedBlockState = context.getLevel().getBlockState(pos);
		if (replacedBlockState.is(this)) {
			return replacedBlockState.setValue(TYPE, SlabType.DOUBLE).setValue(WATERLOGGED, false);
		} else {
			FluidState replacedFluidState = context.getLevel().getFluidState(pos);
			BlockState result = this.defaultBlockState().setValue(TYPE, SlabType.BOTTOM).setValue(WATERLOGGED, replacedFluidState.is(Fluids.WATER));
			Direction clickedFace = context.getClickedFace();
			return clickedFace != Direction.DOWN && (clickedFace == Direction.UP || !(context.getClickLocation().y - pos.getY() > 0.5))
				? result
				: result.setValue(TYPE, SlabType.TOP);
		}
	}

	@Override
	protected boolean canBeReplaced(final BlockState state, final BlockPlaceContext context) {
		ItemStack itemStack = context.getItemInHand();
		SlabType type = state.getValue(TYPE);
		if (type == SlabType.DOUBLE || !itemStack.is(this.asItem())) {
			return false;
		} else if (context.replacingClickedOnBlock()) {
			boolean above = context.getClickLocation().y - context.getClickedPos().getY() > 0.5;
			Direction clickedFace = context.getClickedFace();
			return type == SlabType.BOTTOM
				? clickedFace == Direction.UP || above && clickedFace.getAxis().isHorizontal()
				: clickedFace == Direction.DOWN || !above && clickedFace.getAxis().isHorizontal();
		} else {
			return true;
		}
	}

	@Override
	protected FluidState getFluidState(final BlockState state) {
		return state.getValue(WATERLOGGED) ? Fluids.WATER.getSource(false) : super.getFluidState(state);
	}

	@Override
	public boolean placeLiquid(final LevelAccessor level, final BlockPos pos, final BlockState state, final FluidState fluidState) {
		return state.getValue(TYPE) != SlabType.DOUBLE ? SimpleWaterloggedBlock.super.placeLiquid(level, pos, state, fluidState) : false;
	}

	@Override
	public boolean canPlaceLiquid(@Nullable final LivingEntity user, final BlockGetter level, final BlockPos pos, final BlockState state, final Fluid type) {
		return state.getValue(TYPE) != SlabType.DOUBLE ? SimpleWaterloggedBlock.super.canPlaceLiquid(user, level, pos, state, type) : false;
	}

	@Override
	protected BlockState updateShape(
		final BlockState state,
		final LevelReader level,
		final ScheduledTickAccess ticks,
		final BlockPos pos,
		final Direction directionToNeighbour,
		final BlockPos neighbourPos,
		final BlockState neighbourState,
		final RandomSource random
	) {
		if ((Boolean)state.getValue(WATERLOGGED)) {
			ticks.scheduleTick(pos, Fluids.WATER, Fluids.WATER.getTickDelay(level));
		}

		return super.updateShape(state, level, ticks, pos, directionToNeighbour, neighbourPos, neighbourState, random);
	}

	@Override
	protected boolean isPathfindable(final BlockState state, final PathComputationType type) {
		return switch (type) {
			case LAND -> false;
			case WATER -> state.getFluidState().is(FluidTags.WATER);
			case AIR -> false;
			default -> false;
		};
	}
}