import net.minecraft.block.Block;
import net.minecraft.block.BlockState;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.util.Direction;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.BlockRayTraceResult;
import net.minecraft.util.math.RayTraceContext;
import net.minecraft.util.math.Vec3d;
import net.minecraft.world.World;

public class RayTraceUtil {

    public static BlockState getTargetBlock(PlayerEntity player,World world, int maxdistance){
        BlockPos blockpos = getTargetBlockPos(player,world, maxdistance);
        if(blockpos == null) {
            return null;
        }
        BlockState blockstate= world.getBlockState(blockpos);
        return blockstate;
    }

    public static BlockPos getTargetBlockPos(PlayerEntity player,World world, int maxdistance){
        BlockRayTraceResult rayTraceResult = getTargetBlockResult(player,world, maxdistance);
        if(rayTraceResult!=null){
            return new BlockPos(rayTraceResult.getHitVec().getX(),rayTraceResult.getHitVec().getY(),rayTraceResult.getHitVec().getZ());
        }
        return null;
    }

    public static BlockRayTraceResult getTargetBlockResult(PlayerEntity player,World world, int maxdistance){
        Vec3d vec = player.getPositionVector();
        Vec3d vec3 = new Vec3d(vec.x,vec.y+player.getEyeHeight(),vec.z);
        Vec3d vec3a = player.getLook(1.0F);
        Vec3d vec3b = vec3.add(vec3a.getX() * maxdistance, vec3a.getY()*  maxdistance, vec3a.getZ()*  maxdistance);

        BlockRayTraceResult rayTraceResult = world.rayTraceBlocks(new RayTraceContext(vec3, vec3b,RayTraceContext.BlockMode.OUTLINE,  RayTraceContext.FluidMode.ANY, player));


        if(rayTraceResult!=null)
        {
            double xm=rayTraceResult.getHitVec().getX();
            double ym=rayTraceResult.getHitVec().getY();
            double zm=rayTraceResult.getHitVec().getZ();


            //playerIn.sendMessage(new StringTextComponent(rayTraceResult.getFace().toString()));
            if(rayTraceResult.getFace() == Direction.SOUTH) {
                zm--;
            }
            if(rayTraceResult.getFace() == Direction.EAST) {
                xm--;
            }
            if(rayTraceResult.getFace() == Direction.UP) {
                ym--;
            }

            return new BlockRayTraceResult(rayTraceResult.getHitVec(), rayTraceResult.getFace(), new BlockPos(xm,ym,zm), false);
        }
        return null;
    }

}