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);
        }
    }