CustomNPC-Plus/src/main/java/noppes/npcs/NpcMiscInventory.java

package noppes.npcs;

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

import java.util.HashMap;

public class NpcMiscInventory implements IInventory {
    public HashMap<Integer, ItemStack> items = new HashMap<Integer, ItemStack>();
    public int stackLimit = 64;

    private int size;

    public NpcMiscInventory(int size) {
        this.size = size;
    }

    public NBTTagCompound getToNBT() {
        NBTTagCompound nbttagcompound = new NBTTagCompound();
        nbttagcompound.setTag("NpcMiscInv", NBTTags.nbtItemStackList(items));
        return nbttagcompound;
    }

    public void setFromNBT(NBTTagCompound nbttagcompound) {
        items = NBTTags.getItemStackList(nbttagcompound.getTagList("NpcMiscInv", 10));
    }

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

    @Override
    public ItemStack getStackInSlot(int var1) {
        return items.get(var1);
    }

    @Override
    public ItemStack decrStackSize(int par1, int par2) {
        if (items.get(par1) == null)
            return null;

        ItemStack var4 = null;
        if (items.get(par1).stackSize <= par2) {
            var4 = items.get(par1);
            items.put(par1, null);
        } else {
            var4 = items.get(par1).splitStack(par2);

            if (items.get(par1).stackSize == 0) {
                items.put(par1, null);
            }
        }

        return var4;
    }


    public boolean decrStackSize(ItemStack eating, int decrease) {
        for (int slot : items.keySet()) {
            ItemStack item = items.get(slot);
            if (items != null && eating == item && item.stackSize >= decrease) {
                item.splitStack(decrease);
                if (item.stackSize <= 0)
                    items.put(slot, null);
                return true;
            }
        }
        return false;
    }

    @Override
    public ItemStack getStackInSlotOnClosing(int var1) {
        if (items.get(var1) != null) {
            ItemStack var3 = items.get(var1);
            items.put(var1, null);
            return var3;
        }
        return null;
    }

    @Override
    public void setInventorySlotContents(int var1, ItemStack var2) {
        if (var1 >= getSizeInventory())
            return;
        items.put(var1, var2);
    }

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


    @Override
    public boolean isUseableByPlayer(EntityPlayer var1) {
        return true;
    }

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

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

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

    @Override
    public void markDirty() {

    }

    @Override
    public void openInventory() {

    }

    @Override
    public void closeInventory() {

    }

    public boolean addItemStack(ItemStack item) {
        ItemStack mergable;
        boolean merged = false;
        while ((mergable = getMergableItem(item)) != null && mergable.stackSize > 0) {
            int size = mergable.getMaxStackSize() - mergable.stackSize;
            if (size > item.stackSize) {
                mergable.stackSize = mergable.getMaxStackSize();
                item.stackSize -= size;
                merged = true;
            } else {
                mergable.stackSize += item.stackSize;
                item.stackSize = 0;
            }
        }
        if (item.stackSize <= 0)
            return true;
        int slot = firstFreeSlot();
        if (slot >= 0) {
            items.put(slot, item.copy());
            item.stackSize = 0;
            return true;
        }
        return merged;
    }

    public ItemStack getMergableItem(ItemStack item) {
        for (ItemStack is : items.values()) {
            if (NoppesUtilPlayer.compareItems(item, is, false, false) && is.stackSize < is.getMaxStackSize()) {
                return is;
            }
        }
        return null;
    }

    public int firstFreeSlot() {
        for (int i = 0; i < getSizeInventory(); i++) {
            if (items.get(i) == null)
                return i;
        }
        return -1;
    }

    public void setSize(int i) {
        size = i;
    }
}