package com.halestormxv.inventory;

import com.halestormxv.item.CelestialCraft_items;
import com.halestormxv.item.keyPouch;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraftforge.common.util.Constants;

public class InventoryKeyPouch implements IInventory
{
		private String name = "Celestial Keypouch";

		/** Provides NBT Tag Compound to reference */
		private final ItemStack invItem;

		/** Defining your inventory size this way is handy */
		public static final int INV_SIZE = 12;

		/** Inventory's size must be same as number of slots you add to the Container class */
		private ItemStack[] inventory = new ItemStack[INV_SIZE];

		/**
		 * @param itemstack - the ItemStack to which this inventory belongs
		 */
		public InventoryKeyPouch(ItemStack stack)
		{
			invItem = stack;

			// Create a new NBT Tag Compound if one doesn't already exist, or you will crash
			if (!stack.hasTagCompound()) {
				stack.setTagCompound(new NBTTagCompound());
			}
			// note that it's okay to use stack instead of invItem right there
			// both reference the same memory location, so whatever you change using
			// either reference will change in the other

			// Read the inventory contents from NBT
			readFromNBT(stack.getTagCompound());
		}

		@Override
		public int getSizeInventory()
		{
			return inventory.length;
		}

		@Override
		public ItemStack getStackInSlot(int slot)
		{
			return inventory[slot];
		}

		@Override
		public ItemStack decrStackSize(int slot, int amount)
		{
			ItemStack stack = getStackInSlot(slot);
			if(stack != null)
			{
				if(stack.stackSize > amount)
				{
					stack = stack.splitStack(amount);
					// Don't forget this line or your inventory will not be saved!
					markDirty();
				}
				else
				{
					// this method also calls onInventoryChanged, so we don't need to call it again
					setInventorySlotContents(slot, null);
				}
			}
			return stack;
		}

		@Override
		public ItemStack getStackInSlotOnClosing(int slot)
		{
			ItemStack stack = getStackInSlot(slot);
			setInventorySlotContents(slot, null);
			return stack;
		}

		@Override
		public void setInventorySlotContents(int slot, ItemStack stack)
		{
			inventory[slot] = stack;

			if (stack != null && stack.stackSize > getInventoryStackLimit())
			{
				stack.stackSize = getInventoryStackLimit();
			}

			// Don't forget this line or your inventory will not be saved!
			markDirty();
		}

		// 1.7.2+ renamed to getInventoryName
		@Override
		public String getInventoryName()
		{
			return name;
		}

		// 1.7.2+ renamed to hasCustomInventoryName
		@Override
		public boolean hasCustomInventoryName()
		{
			return name.length() > 0;
		}

		@Override
		public int getInventoryStackLimit()
		{
			return 64;
		}

		/**
		 * This is the method that will handle saving the inventory contents, as it is called (or should be called!)
		 * anytime the inventory changes. Perfect. Much better than using onUpdate in an Item, as this will also
		 * let you change things in your inventory without ever opening a Gui, if you want.
		 */
		 // 1.7.2+ renamed to markDirty
		@Override
		public void markDirty()
		{
			for (int i = 0; i < getSizeInventory(); ++i)
			{
				if (getStackInSlot(i) != null && getStackInSlot(i).stackSize == 0) {
					inventory[i] = null;
				}
			}

			// This line here does the work:
			writeToNBT(invItem.getTagCompound());
		}

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

		// 1.7.2+ renamed to openInventory(EntityPlayer player)
		@Override
		public void openInventory() {}

		// 1.7.2+ renamed to closeInventory(EntityPlayer player)
		@Override
		public void closeInventory() {}

		/**
		 * This method doesn't seem to do what it claims to do, as
		 * items can still be left-clicked and placed in the inventory
		 * even when this returns false
		 */
		@Override
		public boolean isItemValidForSlot(int slot, ItemStack itemstack)
		{
			// Don't want to be able to store the inventory item within itself
			// Bad things will happen, like losing your inventory
			// Actually, this needs a custom Slot to work
			return !(itemstack.getItem() instanceof keyPouch);
		}

		/**
		 * A custom method to read our inventory from an ItemStack's NBT compound
		 */
		public void readFromNBT(NBTTagCompound compound)
		{
			// Gets the custom taglist we wrote to this compound, if any
			// 1.7.2+ change to compound.getTagList("ItemInventory", Constants.NBT.TAG_COMPOUND);
			NBTTagList items = compound.getTagList("ItemInventory", Constants.NBT.TAG_COMPOUND);

			for (int i = 0; i < items.tagCount(); ++i)
			{
				// 1.7.2+ change to items.getCompoundTagAt(i)
				NBTTagCompound item = (NBTTagCompound) items.getCompoundTagAt(i);
				int slot = item.getInteger("Slot");

				// Just double-checking that the saved slot index is within our inventory array bounds
				if (slot >= 0 && slot < getSizeInventory()) {
					inventory[slot] = ItemStack.loadItemStackFromNBT(item);
				}
			}
		}

		/**
		 * A custom method to write our inventory to an ItemStack's NBT compound
		 */
		public void writeToNBT(NBTTagCompound tagcompound)
		{
			// Create a new NBT Tag List to store itemstacks as NBT Tags
			NBTTagList items = new NBTTagList();

			for (int i = 0; i < getSizeInventory(); ++i)
			{
				// Only write stacks that contain items
				if (getStackInSlot(i) != null)
				{
					// Make a new NBT Tag Compound to write the itemstack and slot index to
					NBTTagCompound item = new NBTTagCompound();
					item.setInteger("Slot", i);
					// Writes the itemstack in slot(i) to the Tag Compound we just made
					getStackInSlot(i).writeToNBT(item);

					// add the tag compound to our tag list
					items.appendTag(item);
				}
			}
			// Add the TagList to the ItemStack's Tag Compound with the name "ItemInventory"
			tagcompound.setTag("ItemInventory", items);
		}
	}