/**
 * Copyright (c) 2011-2015, SpaceToad and the BuildCraft Team
 * http://www.mod-buildcraft.com
 * <p/>
 * 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.core.lib.inventory;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;

/**
 * Wrapper class used to specify part of an existing inventory to be treated as
 * a complete inventory. Used primarily to map a side of an ISidedInventory, but
 * it is also helpful for complex inventories such as the Tunnel Bore.
 */
public class InventoryMapper implements IInventory {

	private final IInventory inv;
	private final int start;
	private final int size;
	private int stackSizeLimit = -1;
	private boolean checkItems = true;

	/**
	 * Creates a new InventoryMapper
	 *
	 * @param inv The backing inventory
	 * @param start The starting index
	 * @param size The size of the new inventory, take care not to exceed the
	 * end of the backing inventory
	 */
	public InventoryMapper(IInventory inv, int start, int size) {
		this(inv, start, size, true);
	}

	public InventoryMapper(IInventory inv, int start, int size, boolean checkItems) {
		this.inv = inv;
		this.start = start;
		this.size = size;
		this.checkItems = checkItems;
	}

	public IInventory getBaseInventory() {
		return inv;
	}

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

	@Override
	public ItemStack getStackInSlot(int slot) {
		return inv.getStackInSlot(start + slot);
	}

	@Override
	public ItemStack decrStackSize(int slot, int amount) {
		return inv.decrStackSize(start + slot, amount);
	}

	@Override
	public void setInventorySlotContents(int slot, ItemStack itemstack) {
		inv.setInventorySlotContents(start + slot, itemstack);
	}

	@Override
	public String getInventoryName() {
		return inv.getInventoryName();
	}

	public void setStackSizeLimit(int limit) {
		stackSizeLimit = limit;
	}

	@Override
	public int getInventoryStackLimit() {
		return stackSizeLimit > 0 ? stackSizeLimit : inv.getInventoryStackLimit();
	}

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

	@Override
	public void openInventory() {
		inv.openInventory();
	}

	@Override
	public void closeInventory() {
		inv.closeInventory();
	}

	@Override
	public ItemStack getStackInSlotOnClosing(int slot) {
		return inv.getStackInSlotOnClosing(start + slot);
	}

	@Override
	public boolean isItemValidForSlot(int slot, ItemStack stack) {
		if (checkItems) {
			return inv.isItemValidForSlot(start + slot, stack);
		}
		return true;
	}

	@Override
	public boolean hasCustomInventoryName() {
		return inv.hasCustomInventoryName();
	}

	@Override
	public void markDirty() {
		inv.markDirty();
	}
}