equivalent-exchange-3/src/main/java/com/pahimar/ee3/inventory/ContainerAlchemicalBag.java

package com.pahimar.ee3.inventory;

import com.pahimar.ee3.helper.ItemStackNBTHelper;
import com.pahimar.ee3.item.ItemAlchemicalBag;
import com.pahimar.ee3.lib.Strings;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;

/**
 * Equivalent-Exchange-3
 * <p/>
 * ContainerAlchemicalBag
 *
 * @author pahimar
 */
public class ContainerAlchemicalBag extends Container
{
    private final EntityPlayer entityPlayer;
    private final InventoryAlchemicalBag inventoryAlchemicalBag;

    private int bagInventoryRows;
    private int bagInventoryColumns;

    // Small Bag
    public static final int SMALL_BAG_INVENTORY_ROWS = 4;
    public static final int SMALL_BAG_INVENTORY_COLUMNS = 12;

    // Medium Bag
    public static final int MEDIUM_BAG_INVENTORY_ROWS = 7;
    public static final int MEDIUM_BAG_INVENTORY_COLUMNS = 12;

    // Large Bag
    public static final int LARGE_BAG_INVENTORY_ROWS = 9;
    public static final int LARGE_BAG_INVENTORY_COLUMNS = 13;

    // Player Inventory
    private final int PLAYER_INVENTORY_ROWS = 3;
    private final int PLAYER_INVENTORY_COLUMNS = 9;

    public ContainerAlchemicalBag(EntityPlayer entityPlayer, InventoryAlchemicalBag inventoryAlchemicalBag)
    {
        this.entityPlayer = entityPlayer;
        this.inventoryAlchemicalBag = inventoryAlchemicalBag;

        if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 0)
        {
            bagInventoryRows = SMALL_BAG_INVENTORY_ROWS;
            bagInventoryColumns = SMALL_BAG_INVENTORY_COLUMNS;
        }
        else if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 1)
        {
            bagInventoryRows = MEDIUM_BAG_INVENTORY_ROWS;
            bagInventoryColumns = MEDIUM_BAG_INVENTORY_COLUMNS;
        }
        else if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 2)
        {
            bagInventoryRows = LARGE_BAG_INVENTORY_ROWS;
            bagInventoryColumns = LARGE_BAG_INVENTORY_COLUMNS;
        }

        // Add the Alchemical Chest slots to the container
        for (int bagRowIndex = 0; bagRowIndex < bagInventoryRows; ++bagRowIndex)
        {
            for (int bagColumnIndex = 0; bagColumnIndex < bagInventoryColumns; ++bagColumnIndex)
            {
                if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 0)
                {
                    this.addSlotToContainer(new SlotAlchemicalBag(this, inventoryAlchemicalBag, entityPlayer, bagColumnIndex + bagRowIndex * bagInventoryColumns, 8 + bagColumnIndex * 18, 18 + bagRowIndex * 18));
                }
                else if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 1)
                {
                    this.addSlotToContainer(new SlotAlchemicalBag(this, inventoryAlchemicalBag, entityPlayer, bagColumnIndex + bagRowIndex * bagInventoryColumns, 8 + bagColumnIndex * 18, 18 + bagRowIndex * 18));
                }
                else if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 2)
                {
                    this.addSlotToContainer(new SlotAlchemicalBag(this, inventoryAlchemicalBag, entityPlayer, bagColumnIndex + bagRowIndex * bagInventoryColumns, 8 + bagColumnIndex * 18, 8 + bagRowIndex * 18));
                }
            }
        }

        // Add the player's inventory slots to the container
        for (int inventoryRowIndex = 0; inventoryRowIndex < PLAYER_INVENTORY_ROWS; ++inventoryRowIndex)
        {
            for (int inventoryColumnIndex = 0; inventoryColumnIndex < PLAYER_INVENTORY_COLUMNS; ++inventoryColumnIndex)
            {
                if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 0)
                {
                    this.addSlotToContainer(new Slot(entityPlayer.inventory, inventoryColumnIndex + inventoryRowIndex * 9 + 9, 35 + inventoryColumnIndex * 18, 104 + inventoryRowIndex * 18));
                }
                else if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 1)
                {
                    this.addSlotToContainer(new Slot(entityPlayer.inventory, inventoryColumnIndex + inventoryRowIndex * 9 + 9, 35 + inventoryColumnIndex * 18, 158 + inventoryRowIndex * 18));
                }
                else if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 2)
                {
                    this.addSlotToContainer(new Slot(entityPlayer.inventory, inventoryColumnIndex + inventoryRowIndex * 9 + 9, 44 + inventoryColumnIndex * 18, 174 + inventoryRowIndex * 18));
                }
            }
        }

        // Add the player's action bar slots to the container
        for (int actionBarSlotIndex = 0; actionBarSlotIndex < PLAYER_INVENTORY_COLUMNS; ++actionBarSlotIndex)
        {
            if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 0)
            {
                this.addSlotToContainer(new Slot(entityPlayer.inventory, actionBarSlotIndex, 35 + actionBarSlotIndex * 18, 162));
            }
            else if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 1)
            {
                this.addSlotToContainer(new Slot(entityPlayer.inventory, actionBarSlotIndex, 35 + actionBarSlotIndex * 18, 216));
            }
            else if (inventoryAlchemicalBag.parentItemStack.getItemDamage() == 2)
            {
                this.addSlotToContainer(new Slot(entityPlayer.inventory, actionBarSlotIndex, 44 + actionBarSlotIndex * 18, 232));
            }
        }
    }

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

    @Override
    public void onContainerClosed(EntityPlayer entityPlayer)
    {
        super.onContainerClosed(entityPlayer);

        if (!entityPlayer.worldObj.isRemote)
        {
            // We can probably do this better now considering the InventoryAlchemicalBag has a findParent method
            InventoryPlayer invPlayer = entityPlayer.inventory;
            for (ItemStack itemStack : invPlayer.mainInventory)
            {
                if (itemStack != null)
                {
                    if (ItemStackNBTHelper.hasTag(itemStack, Strings.NBT_ITEM_ALCHEMICAL_BAG_GUI_OPEN))
                    {
                        ItemStackNBTHelper.removeTag(itemStack, Strings.NBT_ITEM_ALCHEMICAL_BAG_GUI_OPEN);
                    }
                }
            }

            saveInventory(entityPlayer);
        }
    }

    @Override
    public ItemStack transferStackInSlot(EntityPlayer entityPlayer, int slotIndex)
    {
        ItemStack newItemStack = null;
        Slot slot = (Slot) inventorySlots.get(slotIndex);

        if (slot != null && slot.getHasStack())
        {
            ItemStack itemStack = slot.getStack();
            newItemStack = itemStack.copy();

            // Attempt to shift click something from the bag inventory into the player inventory
            if (slotIndex < bagInventoryRows * bagInventoryColumns)
            {
                if (!this.mergeItemStack(itemStack, bagInventoryRows * bagInventoryColumns, inventorySlots.size(), false))
                {
                    return null;
                }
            }
            // Special case if we are dealing with an Alchemical Bag being shift clicked
            else if (itemStack.getItem() instanceof ItemAlchemicalBag)
            {
                // Attempt to shift click a bag from the player inventory into the hot bar inventory
                if (slotIndex < (bagInventoryRows * bagInventoryColumns) + (PLAYER_INVENTORY_ROWS * PLAYER_INVENTORY_COLUMNS))
                {
                    if (!this.mergeItemStack(itemStack, (bagInventoryRows * bagInventoryColumns) + (PLAYER_INVENTORY_ROWS * PLAYER_INVENTORY_COLUMNS), inventorySlots.size(), false))
                    {
                        return null;
                    }
                }
                // Attempt to shift click a bag from the hot bar inventory into the player inventory
                else if (!this.mergeItemStack(itemStack, bagInventoryRows * bagInventoryColumns, (bagInventoryRows * bagInventoryColumns) + (PLAYER_INVENTORY_ROWS * PLAYER_INVENTORY_COLUMNS), false))
                {
                    return null;
                }
            }
            // Attempt to shift click a non-Alchemical Bag into the bag inventory
            else if (!this.mergeItemStack(itemStack, 0, bagInventoryRows * bagInventoryColumns, false))
            {
                return null;
            }


            if (itemStack.stackSize == 0)
            {
                slot.putStack(null);
            }
            else
            {
                slot.onSlotChanged();
            }
        }

        return newItemStack;
    }

    public void saveInventory(EntityPlayer entityPlayer)
    {
        inventoryAlchemicalBag.onGuiSaved(entityPlayer);
    }
}