CC-Tweaked/src/main/java/dan200/computercraft/shared/turtle/core/TurtleDetectCommand.java

/*
 * This file is part of ComputerCraft - http://www.computercraft.info
 * Copyright Daniel Ratcliffe, 2011-2019. Do not distribute without permission.
 * Send enquiries to dratcliffe@gmail.com
 */

package dan200.computercraft.shared.turtle.core;

import dan200.computercraft.api.turtle.ITurtleAccess;
import dan200.computercraft.api.turtle.ITurtleCommand;
import dan200.computercraft.api.turtle.TurtleCommandResult;
import dan200.computercraft.shared.util.WorldUtil;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

import javax.annotation.Nonnull;

public class TurtleDetectCommand implements ITurtleCommand
{
    private final InteractDirection m_direction;

    public TurtleDetectCommand( InteractDirection direction )
    {
        m_direction = direction;
    }

    @Nonnull
    @Override
    public TurtleCommandResult execute( @Nonnull ITurtleAccess turtle )
    {
        // Get world direction from direction
        EnumFacing direction = m_direction.toWorldDir( turtle );

        // Check if thing in front is air or not
        World world = turtle.getWorld();
        BlockPos oldPosition = turtle.getPosition();
        BlockPos newPosition = oldPosition.offset( direction );

        if( !WorldUtil.isLiquidBlock( world, newPosition ) && !world.isAirBlock( newPosition ) )
        {
            return TurtleCommandResult.success();
        }

        return TurtleCommandResult.failure();
    }
}