TileQuarry.java

/**
 * Copyright (c) 2011-2015, SpaceToad and the BuildCraft Team
 * http://www.mod-buildcraft.com
 *
 * BuildCraft is distributed under the terms of the Minecraft Mod Public
 * License 1.0, or MMPL. Please check the contents of the license located in
 * http://www.mod-buildcraft.com/MMPL-1.0.txt
 */
package buildcraft.builders;

import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import io.netty.buffer.ByteBuf;

import net.minecraft.block.Block;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.ISidedInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.util.ChatComponentText;
import net.minecraft.util.MathHelper;
import net.minecraft.world.ChunkCoordIntPair;
import net.minecraftforge.common.ForgeChunkManager;
import net.minecraftforge.common.ForgeChunkManager.Ticket;
import net.minecraftforge.common.ForgeChunkManager.Type;
import net.minecraftforge.common.util.FakePlayer;
import net.minecraftforge.common.util.ForgeDirection;

import buildcraft.BuildCraftBuilders;
import buildcraft.BuildCraftCore;
import buildcraft.api.blueprints.BuilderAPI;
import buildcraft.api.core.BuildCraftAPI;
import buildcraft.api.core.IAreaProvider;
import buildcraft.api.core.SafeTimeTracker;
import buildcraft.api.filler.FillerManager;
import buildcraft.api.statements.IStatementParameter;
import buildcraft.api.tiles.IControllable;
import buildcraft.api.tiles.IHasWork;
import buildcraft.api.transport.IPipeConnection;
import buildcraft.api.transport.IPipeTile;
import buildcraft.core.Box;
import buildcraft.core.Box.Kind;
import buildcraft.core.CoreConstants;
import buildcraft.core.DefaultAreaProvider;
import buildcraft.core.blueprints.Blueprint;
import buildcraft.core.blueprints.BptBuilderBase;
import buildcraft.core.blueprints.BptBuilderBlueprint;
import buildcraft.core.builders.TileAbstractBuilder;
import buildcraft.core.builders.patterns.FillerPattern;
import buildcraft.core.internal.IDropControlInventory;
import buildcraft.core.lib.RFBattery;
import buildcraft.core.lib.utils.BlockMiner;
import buildcraft.core.lib.utils.BlockUtils;
import buildcraft.core.lib.utils.Utils;
import buildcraft.core.proxy.CoreProxy;

public class TileQuarry extends TileAbstractBuilder implements IHasWork, ISidedInventory, IDropControlInventory, IPipeConnection, IControllable {

	private static enum Stage {
		BUILDING,
		DIGGING,
		MOVING,
		IDLE,
		DONE
	}

	public EntityMechanicalArm arm;
	public EntityPlayer placedBy;

	protected Box box = new Box();
	private int targetX, targetY, targetZ;
	private double headPosX, headPosY, headPosZ;
	private double speed = 0.03;
	private Stage stage = Stage.BUILDING;
	private boolean movingHorizontally;
	private boolean movingVertically;
	private float headTrajectory;

	private SafeTimeTracker updateTracker = new SafeTimeTracker(BuildCraftCore.updateFactor);

	private BptBuilderBase builder;

	private final LinkedList<int[]> visitList = Lists.newLinkedList();

	private boolean loadDefaultBoundaries = false;
	private Ticket chunkTicket;

	private boolean frameProducer = true;

	private NBTTagCompound initNBT = null;

	private BlockMiner miner;

	private int ledState;

	public TileQuarry () {
		box.kind = Kind.STRIPES;
		this.setBattery(new RFBattery((int) (2 * 64 * BuilderAPI.BREAK_ENERGY * BuildCraftCore.miningMultiplier), (int) (1000 * BuildCraftCore.miningMultiplier), 0));
	}

	public void createUtilsIfNeeded() {
		if (!worldObj.isRemote) {
			if (builder == null) {
				if (!box.isInitialized()) {
					setBoundaries(loadDefaultBoundaries);
				}

				initializeBlueprintBuilder();
			}
		}

		if (stage != Stage.BUILDING) {
			box.isVisible = false;

			if (arm == null) {
				createArm();
			}

			if (findTarget(false)) {
				if (box != null && ((headPosX < box.xMin || headPosX > box.xMax) || (headPosZ < box.zMin || headPosZ > box.zMax))) {
					setHead(box.xMin + 1, yCoord + 2, box.zMin + 1);
				}
			}
		} else {
			box.isVisible = true;
		}
	}

	private void createArm() {
		worldObj.spawnEntityInWorld
		(new EntityMechanicalArm(worldObj,
				box.xMin + CoreConstants.PIPE_MAX_POS,
				yCoord + box.sizeY () - 1 + CoreConstants.PIPE_MIN_POS,
				box.zMin + CoreConstants.PIPE_MAX_POS,
				box.sizeX () - 2 + CoreConstants.PIPE_MIN_POS * 2,
				box.sizeZ() - 2 + CoreConstants.PIPE_MIN_POS * 2,
				this));
	}

	// Callback from the arm once it's created
	public void setArm(EntityMechanicalArm arm) {
		this.arm = arm;
	}

	public boolean areChunksLoaded() {
		if (BuildCraftBuilders.quarryLoadsChunks) {
			// Small optimization
			return true;
		}

		// Each chunk covers the full height, so we only check one of them per height.
		return worldObj.blockExists(box.xMin, box.yMax, box.zMin)
				&& worldObj.blockExists(box.xMax, box.yMax, box.zMin)
				&& worldObj.blockExists(box.xMin, box.yMax, box.zMax)
				&& worldObj.blockExists(box.xMax, box.yMax, box.zMax);
	}
	@Override
	public void updateEntity() {
		super.updateEntity();

		if (worldObj.isRemote) {
			if (stage != Stage.DONE) {
				moveHead(speed);
			}

			return;
		}

		if (stage == Stage.DONE) {
			if (mode == Mode.Loop) {
				stage = Stage.IDLE;
			} else {
				return;
			}
		}

		if (!areChunksLoaded()) {
			return;
		}

		if (mode == Mode.Off && stage != Stage.MOVING) {
			return;
		}

		createUtilsIfNeeded();

		if (stage == Stage.BUILDING) {
			if (builder != null && !builder.isDone(this)) {
				builder.buildNextSlot(worldObj, this, xCoord, yCoord, zCoord);
			} else {
				stage = Stage.IDLE;
			}
		} else if (stage == Stage.DIGGING) {
			dig();
		} else if (stage == Stage.IDLE) {
			idling();

			// We are sending a network packet update ONLY below.
			// In this case, since idling() does it anyway, we should return.
			return;
		} else if (stage == Stage.MOVING) {
			int energyUsed = this.getBattery().useEnergy(20, (int) Math.ceil(20 + getBattery().getEnergyStored() / 10), false);

			if (energyUsed >= 20) {

				speed = 0.1 + energyUsed / 2000F;

				// If it's raining or snowing above the head, slow down.
				if (worldObj.isRaining()) {
					int headBPX = (int) headPosX;
					int headBPY = (int) headPosY;
					int headBPZ = (int) headPosZ;
					if (worldObj.getHeightValue(headBPX, headBPZ) < headBPY) {
						speed *= 0.7;
					}
				}

				moveHead(speed);
			}
		}

		if (updateTracker.markTimeIfDelay(worldObj)) {
			sendNetworkUpdate();
		}
	}

	protected void dig() {
		if (worldObj.isRemote) {
			return;
		}

		if (miner == null) {
			// Hmm.
			stage = Stage.IDLE;
			return;
		}

		int rfTaken = miner.acceptEnergy(getBattery().getEnergyStored());
		getBattery().useEnergy(rfTaken, rfTaken, false);

		if (miner.hasMined()) {
			// Collect any lost items laying around
			double[] head = getHead();
			AxisAlignedBB axis = AxisAlignedBB.getBoundingBox(head[0] - 2, head[1] - 2, head[2] - 2, head[0] + 3, head[1] + 3, head[2] + 3);
			List result = worldObj.getEntitiesWithinAABB(EntityItem.class, axis);
			for (int ii = 0; ii < result.size(); ii++) {
				if (result.get(ii) instanceof EntityItem) {
					EntityItem entity = (EntityItem) result.get(ii);
					if (entity.isDead) {
						continue;
					}

					ItemStack mineable = entity.getEntityItem();
					if (mineable.stackSize <= 0) {
						continue;
					}
					CoreProxy.proxy.removeEntity(entity);
					miner.mineStack(mineable);
				}
			}

			stage = Stage.IDLE;
			miner = null;
		}
	}
	protected void idling() {
		if (!findTarget(true)) {
			// I believe the issue is box going null becuase of bad chunkloader positioning
			if (arm != null && box != null) {
				setTarget(box.xMin + 1, yCoord + 2, box.zMin + 1);
			}

			stage = Stage.DONE;
		} else {
			stage = Stage.MOVING;
		}

		movingHorizontally = true;
		movingVertically = true;
		double[] head = getHead();
		int[] target = getTarget();
		headTrajectory = (float) Math.atan2(target[2] - head[2], target[0] - head[0]);
		sendNetworkUpdate();
	}

	public boolean findTarget(boolean doSet) {
		if (worldObj.isRemote) {
			return false;
		}

		boolean columnVisitListIsUpdated = false;

		if (visitList.isEmpty()) {
			createColumnVisitList();
			columnVisitListIsUpdated = true;
		}

		if (!doSet) {
			return !visitList.isEmpty();
		}

		if (visitList.isEmpty()) {
			return false;
		}

		int[] nextTarget = visitList.removeFirst();

		if (!columnVisitListIsUpdated) { // nextTarget may not be accurate, at least search the target column for changes
			for (int y = nextTarget[1] + 1; y < yCoord + 3; y++) {
				Block block = worldObj.getBlock(nextTarget[0], y, nextTarget[2]);
				if (BlockUtils.isAnObstructingBlock(block, worldObj, nextTarget[0], y, nextTarget[2])
						|| !BuildCraftAPI.isSoftBlock(worldObj, nextTarget[0], y, nextTarget[2])) {
					createColumnVisitList();
					columnVisitListIsUpdated = true;
					nextTarget = null;
					break;
				}
			}
		}

		if (columnVisitListIsUpdated && nextTarget == null && !visitList.isEmpty()) {
			nextTarget = visitList.removeFirst();
		} else if (columnVisitListIsUpdated && nextTarget == null) {
			return false;
		}

		setTarget(nextTarget[0], nextTarget[1] + 1, nextTarget[2]);

		return true;
	}

	/**
	 * Make the column visit list: called once per layer
	 */
	private void createColumnVisitList() {
		visitList.clear();

		Integer[][] columnHeights = new Integer[builder.blueprint.sizeX - 2][builder.blueprint.sizeZ - 2];
		boolean[][] blockedColumns = new boolean[builder.blueprint.sizeX - 2][builder.blueprint.sizeZ - 2];

		for (int searchY = yCoord + 3; searchY >= 1; --searchY) {
			int startX, endX, incX;

			if (searchY % 2 == 0) {
				startX = 0;
				endX = builder.blueprint.sizeX - 2;
				incX = 1;
			} else {
				startX = builder.blueprint.sizeX - 3;
				endX = -1;
				incX = -1;
			}

			for (int searchX = startX; searchX != endX; searchX += incX) {
				int startZ, endZ, incZ;

				if (searchX % 2 == searchY % 2) {
					startZ = 0;
					endZ = builder.blueprint.sizeZ - 2;
					incZ = 1;
				} else {
					startZ = builder.blueprint.sizeZ - 3;
					endZ = -1;
					incZ = -1;
				}

				for (int searchZ = startZ; searchZ != endZ; searchZ += incZ) {
					if (!blockedColumns[searchX][searchZ]) {
						Integer height = columnHeights[searchX][searchZ];
						int bx = box.xMin + searchX + 1, by = searchY, bz = box.zMin + searchZ + 1;

						if (height == null) {
							columnHeights[searchX][searchZ] = height = worldObj.getHeightValue(bx, bz);
						}

						if (height > 0 && height < by && worldObj.provider.dimensionId != -1) {
							continue;
						}

						Block block = worldObj.getBlock(bx, by, bz);

						if (!BlockUtils.canChangeBlock(block, worldObj, bx, by, bz)) {
							blockedColumns[searchX][searchZ] = true;
						} else if (!BuildCraftAPI.isSoftBlock(worldObj, bx, by, bz)) {
							visitList.add(new int[]{bx, by, bz});
						}

						if (height == 0 && !worldObj.isAirBlock(bx, by, bz)) {
							columnHeights[searchX][searchZ] = by;
						}

						// Stop at two planes - generally any obstructions will have been found and will force a recompute prior to this

						if (visitList.size() > builder.blueprint.sizeZ * builder.blueprint.sizeX * 2) {
							return;
						}
					}
				}
			}
		}
	}

	@Override
	public void readFromNBT(NBTTagCompound nbttagcompound) {
		super.readFromNBT(nbttagcompound);

		if (nbttagcompound.hasKey("box")) {
			box.initialize(nbttagcompound.getCompoundTag("box"));

			loadDefaultBoundaries = false;
		} else if (nbttagcompound.hasKey("xSize")) {
			// This is a legacy save, get old data

			int xMin = nbttagcompound.getInteger("xMin");
			int zMin = nbttagcompound.getInteger("zMin");

			int xSize = nbttagcompound.getInteger("xSize");
			int ySize = nbttagcompound.getInteger("ySize");
			int zSize = nbttagcompound.getInteger("zSize");

			box.initialize(xMin, yCoord, zMin, xMin + xSize - 1, yCoord + ySize - 1, zMin + zSize - 1);

			loadDefaultBoundaries = false;
		} else {
			// This is a legacy save, compute boundaries

			loadDefaultBoundaries = true;
		}

		targetX = nbttagcompound.getInteger("targetX");
		targetY = nbttagcompound.getInteger("targetY");
		targetZ = nbttagcompound.getInteger("targetZ");
		headPosX = nbttagcompound.getDouble("headPosX");
		headPosY = nbttagcompound.getDouble("headPosY");
		headPosZ = nbttagcompound.getDouble("headPosZ");

		// The rest of load has to be done upon initialize.
		initNBT = (NBTTagCompound) nbttagcompound.getCompoundTag("bpt").copy();
	}

	@Override
	public void writeToNBT(NBTTagCompound nbttagcompound) {
		super.writeToNBT(nbttagcompound);

		nbttagcompound.setInteger("targetX", targetX);
		nbttagcompound.setInteger("targetY", targetY);
		nbttagcompound.setInteger("targetZ", targetZ);
		nbttagcompound.setDouble("headPosX", headPosX);
		nbttagcompound.setDouble("headPosY", headPosY);
		nbttagcompound.setDouble("headPosZ", headPosZ);

		NBTTagCompound boxTag = new NBTTagCompound();
		box.writeToNBT(boxTag);
		nbttagcompound.setTag("box", boxTag);

		NBTTagCompound bptNBT = new NBTTagCompound();

		if (builder != null) {
			NBTTagCompound builderCpt = new NBTTagCompound();
			builder.saveBuildStateToNBT(builderCpt, this);
			bptNBT.setTag("builderState", builderCpt);
		}

		nbttagcompound.setTag("bpt", bptNBT);
	}

	@SuppressWarnings("rawtypes")
	public void positionReached() {
		if (worldObj.isRemote) {
			return;
		}

		if (isQuarriableBlock(targetX, targetY - 1, targetZ)) {
			miner = new BlockMiner(worldObj, this, targetX, targetY - 1, targetZ);
			stage = Stage.DIGGING;
		} else {
			stage = Stage.IDLE;
		}
	}

	private boolean isQuarriableBlock(int bx, int by, int bz) {
		Block block = worldObj.getBlock(bx, by, bz);
		return BlockUtils.canChangeBlock(block, worldObj, bx, by, bz)
				&& !BuildCraftAPI.isSoftBlock(worldObj, bx, by, bz);
	}

	@Override
	public void invalidate() {
		if (chunkTicket != null) {
			ForgeChunkManager.releaseTicket(chunkTicket);
		}

		super.invalidate();
		destroy();
	}

	@Override
	public void onChunkUnload() {
		destroy();
	}

	@Override
	public void destroy() {
		if (arm != null) {
			arm.setDead();
		}

		arm = null;

		frameProducer = false;

		if (miner != null) {
			miner.invalidate();
		}
	}

	@Override
	public boolean hasWork() {
		return stage != Stage.DONE;
	}

	private void setBoundaries(boolean useDefaultI) {
		boolean useDefault = useDefaultI;

		if (BuildCraftBuilders.quarryLoadsChunks && chunkTicket == null) {
			chunkTicket = ForgeChunkManager.requestTicket(BuildCraftBuilders.instance, worldObj, Type.NORMAL);
		}
		if (chunkTicket != null) {
			chunkTicket.getModData().setInteger("quarryX", xCoord);
			chunkTicket.getModData().setInteger("quarryY", yCoord);
			chunkTicket.getModData().setInteger("quarryZ", zCoord);
			ForgeChunkManager.forceChunk(chunkTicket, new ChunkCoordIntPair(xCoord >> 4, zCoord >> 4));
		}

		IAreaProvider a = null;

		if (!useDefault) {
			a = Utils.getNearbyAreaProvider(worldObj, xCoord, yCoord, zCoord);
		}

		if (a == null) {
			a = new DefaultAreaProvider(xCoord, yCoord, zCoord, xCoord + 10, yCoord + 4, zCoord + 10);

			useDefault = true;
		}

		int xSize = a.xMax() - a.xMin() + 1;
		int zSize = a.zMax() - a.zMin() + 1;

		if (chunkTicket != null) {
			if (xSize < 3 || zSize < 3 || ((xSize * zSize) >> 8) >= chunkTicket.getMaxChunkListDepth()) {
				if (placedBy != null) {
					placedBy.addChatMessage(new ChatComponentText(
							String.format(
									"Quarry size is outside of chunkloading bounds or too small %d %d (%d)",
									xSize, zSize,
									chunkTicket.getMaxChunkListDepth())));
				}

				a = new DefaultAreaProvider(xCoord, yCoord, zCoord, xCoord + 10, yCoord + 4, zCoord + 10);
				useDefault = true;
			}
		}

		xSize = a.xMax() - a.xMin() + 1;
		int ySize = a.yMax() - a.yMin() + 1;
		zSize = a.zMax() - a.zMin() + 1;

		box.initialize(a);

		if (ySize < 5) {
			ySize = 5;
			box.yMax = box.yMin + ySize - 1;
		}

		if (useDefault) {
			int xMin, zMin;

			ForgeDirection o = ForgeDirection.values()[worldObj.getBlockMetadata(xCoord, yCoord, zCoord)].getOpposite();

			switch (o) {
			case EAST:
				xMin = xCoord + 1;
				zMin = zCoord - 4 - 1;
				break;
			case WEST:
				xMin = xCoord - 9 - 2;
				zMin = zCoord - 4 - 1;
				break;
			case SOUTH:
				xMin = xCoord - 4 - 1;
				zMin = zCoord + 1;
				break;
			case NORTH:
			default:
				xMin = xCoord - 4 - 1;
				zMin = zCoord - 9 - 2;
				break;
			}

			box.initialize(xMin, yCoord, zMin, xMin + xSize - 1, yCoord + ySize - 1, zMin + zSize - 1);
		}

		a.removeFromWorld();
		if (chunkTicket != null) {
			forceChunkLoading(chunkTicket);
		}

		sendNetworkUpdate();
	}

	private void initializeBlueprintBuilder() {
		Blueprint bpt = ((FillerPattern) FillerManager.registry.getPattern("buildcraft:frame"))
				.getBlueprint(box, worldObj, new IStatementParameter[0], BuildCraftBuilders.frameBlock, 0);

		if (bpt != null) {
			builder = new BptBuilderBlueprint(bpt, worldObj, box.xMin, yCoord, box.zMin);
			stage = Stage.BUILDING;
		}
	}

	@Override
	public void writeData(ByteBuf stream) {
		super.writeData(stream);
		box.writeData(stream);
		stream.writeInt(targetX);
		stream.writeShort(targetY);
		stream.writeInt(targetZ);
		stream.writeDouble(headPosX);
		stream.writeDouble(headPosY);
		stream.writeDouble(headPosZ);
		stream.writeFloat((float) speed);
		stream.writeFloat((float) headTrajectory);
		int flags = stage.ordinal();
		flags |= movingHorizontally ? 0x10 : 0;
		flags |= movingVertically ? 0x20 : 0;
		stream.writeByte(flags);

		ledState = (hasWork() && mode != Mode.Off && getTicksSinceEnergyReceived() < 12 ? 16 : 0) | (getBattery().getEnergyStored() * 15 / getBattery().getMaxEnergyStored());
		stream.writeByte(ledState);
	}

	@Override
	public void readData(ByteBuf stream) {
		super.readData(stream);
		box.readData(stream);
		targetX = stream.readInt();
		targetY = stream.readUnsignedShort();
		targetZ = stream.readInt();
		headPosX = stream.readDouble();
		headPosY = stream.readDouble();
		headPosZ = stream.readDouble();
		speed = stream.readFloat();
		headTrajectory = stream.readFloat();
		int flags = stream.readUnsignedByte();
		stage = Stage.values()[flags & 0x07];
		movingHorizontally = (flags & 0x10) != 0;
		movingVertically = (flags & 0x20) != 0;
		int newLedState = stream.readUnsignedByte();
		if (newLedState != ledState) {
			ledState = newLedState;
			worldObj.markBlockRangeForRenderUpdate(xCoord, yCoord, zCoord, xCoord, yCoord, zCoord);
		}

		createUtilsIfNeeded();

		if (arm != null) {
			arm.setHead(headPosX, headPosY, headPosZ);
			arm.updatePosition();
		}
	}

	@Override
	public void initialize() {
		super.initialize();

		if (!this.getWorldObj().isRemote && !box.initialized) {
			setBoundaries(false);
		}

		createUtilsIfNeeded();

		if (initNBT != null && builder != null) {
			builder.loadBuildStateToNBT(
					initNBT.getCompoundTag("builderState"), this);
		}

		initNBT = null;

		sendNetworkUpdate();
	}

	public void reinitalize() {
		initializeBlueprintBuilder();
	}

	@Override
	public int getSizeInventory() {
		return 1;
	}

	@Override
	public ItemStack getStackInSlot(int i) {
		if (frameProducer) {
			return new ItemStack(BuildCraftBuilders.frameBlock);
		} else {
			return null;
		}
	}

	@Override
	public ItemStack decrStackSize(int i, int j) {
		if (frameProducer) {
			return new ItemStack(BuildCraftBuilders.frameBlock, j);
		} else {
			return null;
		}
	}

	@Override
	public void setInventorySlotContents(int i, ItemStack itemstack) {
	}

	@Override
	public ItemStack getStackInSlotOnClosing(int slot) {
		return null;
	}

	@Override
	public String getInventoryName() {
		return "";
	}

	@Override
	public int getInventoryStackLimit() {
		return 0;
	}

	@Override
	public boolean isItemValidForSlot(int i, ItemStack itemstack) {
		return false;
	}

	@Override
	public boolean isUseableByPlayer(EntityPlayer entityplayer) {
		return false;
	}

	@Override
	public void openInventory() {
	}

	@Override
	public void closeInventory() {
	}

	@Override
	public boolean isBuildingMaterialSlot(int i) {
		return true;
	}
	
	public void moveHead(double instantSpeed) {
		int[] target = getTarget();
		double[] head = getHead();

		if (movingHorizontally) {
			if (Math.abs(target[0] - head[0]) < instantSpeed * 2 && Math.abs(target[2] - head[2]) < instantSpeed * 2) {
				head[0] = target[0];
				head[2] = target[2];

				movingHorizontally = false;

				if (!movingVertically) {
					positionReached();
					head[1] = target[1];
				}
			} else {
				head[0] += MathHelper.cos(headTrajectory) * instantSpeed;
				head[2] += MathHelper.sin(headTrajectory) * instantSpeed;
			}
			setHead(head[0], head[1], head[2]);
		}

		if (movingVertically) {
			if (Math.abs(target[1] - head[1]) < instantSpeed * 2) {
				head[1] = target[1];

				movingVertically = false;
				if (!movingHorizontally) {
					positionReached();
					head[0] = target[0];
					head[2] = target[2];
				}
			} else {
				if (target[1] > head[1]) {
					head[1] += instantSpeed;
				} else {
					head[1] -= instantSpeed;
				}
			}
			setHead(head[0], head[1], head[2]);
		}

		updatePosition();
	}

	private void updatePosition() {
		if (arm != null && worldObj.isRemote) {
			arm.setHead(headPosX, headPosY, headPosZ);
			arm.updatePosition();
		}
	}

	private void setHead(double x, double y, double z) {
		this.headPosX = x;
		this.headPosY = y;
		this.headPosZ = z;
	}

	private double[] getHead() {
		return new double[]{headPosX, headPosY, headPosZ};
	}

	private int[] getTarget() {
		return new int[]{targetX, targetY, targetZ};
	}

	private void setTarget(int x, int y, int z) {
		this.targetX = x;
		this.targetY = y;
		this.targetZ = z;
	}

	public void forceChunkLoading(Ticket ticket) {
		if (chunkTicket == null) {
			chunkTicket = ticket;
		}

		Set<ChunkCoordIntPair> chunks = Sets.newHashSet();
		ChunkCoordIntPair quarryChunk = new ChunkCoordIntPair(xCoord >> 4, zCoord >> 4);
		chunks.add(quarryChunk);
		ForgeChunkManager.forceChunk(ticket, quarryChunk);

		for (int chunkX = box.xMin >> 4; chunkX <= box.xMax >> 4; chunkX++) {
			for (int chunkZ = box.zMin >> 4; chunkZ <= box.zMax >> 4; chunkZ++) {
				ChunkCoordIntPair chunk = new ChunkCoordIntPair(chunkX, chunkZ);
				ForgeChunkManager.forceChunk(ticket, chunk);
				chunks.add(chunk);
			}
		}

		if (placedBy != null && !(placedBy instanceof FakePlayer)) {
			placedBy.addChatMessage(new ChatComponentText(
					String.format(
							"[BUILDCRAFT] The quarry at %d %d %d will keep %d chunks loaded",
							xCoord, yCoord, zCoord, chunks.size())));
		}
	}

	public int getIconGlowLevel(int renderPass) {
		if (renderPass == 2) { // Red LED
			return ledState & 15;
		} else if (renderPass == 3) { // Green LED
			return (ledState >> 4) > 0 ? 15 : 0;
		} else {
			return -1;
		}
	}

	@Override
	public boolean hasCustomInventoryName() {
		return false;
	}

	@Override
	public AxisAlignedBB getRenderBoundingBox() {
		return new Box (this).extendToEncompass(box).expand(50).getBoundingBox();
	}

	@Override
	public Box getBox() {
		return box;
	}

	@Override
	public int[] getAccessibleSlotsFromSide(int side) {
		return new int[] {};
	}

	@Override
	public boolean canInsertItem(int p1, ItemStack p2, int p3) {
		return false;
	}

	@Override
	public boolean canExtractItem(int p1, ItemStack p2, int p3) {
		return false;
	}

	@Override
	public boolean acceptsControlMode(Mode mode) {
		return mode == Mode.Off || mode == Mode.On || mode == Mode.Loop;
	}

	@Override
	public boolean doDrop() {
		return false;
	}

	@Override
	public ConnectOverride overridePipeConnection(IPipeTile.PipeType type, ForgeDirection with) {
		if (with.ordinal() == worldObj.getBlockMetadata(xCoord, yCoord, zCoord)) {
			return ConnectOverride.DISCONNECT;
		}
		return type == IPipeTile.PipeType.ITEM ? ConnectOverride.CONNECT : ConnectOverride.DEFAULT;
	}
}