ActuallyAdditions/src/main/java/de/ellpeck/actuallyadditions/common/inventory/ContainerDrill.java

package de.ellpeck.actuallyadditions.common.inventory;

import de.ellpeck.actuallyadditions.common.inventory.slot.SlotImmovable;
import de.ellpeck.actuallyadditions.common.inventory.slot.SlotItemHandlerUnconditioned;
import de.ellpeck.actuallyadditions.common.items.ItemDrill;
import de.ellpeck.actuallyadditions.common.items.ItemDrillUpgrade;
import de.ellpeck.actuallyadditions.common.util.ItemStackHandlerAA;
import de.ellpeck.actuallyadditions.common.util.StackUtil;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.inventory.ClickType;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;

public class ContainerDrill extends Container {

    public static final int SLOT_AMOUNT = 5;

    private final ItemStackHandlerAA drillInventory = new ItemStackHandlerAA(SLOT_AMOUNT);
    private final InventoryPlayer inventory;

    public ContainerDrill(InventoryPlayer inventory) {
        this.inventory = inventory;

        for (int i = 0; i < SLOT_AMOUNT; i++) {
            this.addSlotToContainer(new SlotItemHandlerUnconditioned(this.drillInventory, i, 44 + i * 18, 19) {
                @Override
                public boolean isItemValid(ItemStack stack) {
                    return stack.getItem() instanceof ItemDrillUpgrade;
                }
            });
        }

        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 9; j++) {
                this.addSlotToContainer(new Slot(inventory, j + i * 9 + 9, 8 + j * 18, 58 + i * 18));
            }
        }
        for (int i = 0; i < 9; i++) {
            if (i == inventory.currentItem) {
                this.addSlotToContainer(new SlotImmovable(inventory, i, 8 + i * 18, 116));
            } else {
                this.addSlotToContainer(new Slot(inventory, i, 8 + i * 18, 116));
            }
        }

        ItemStack stack = inventory.getCurrentItem();
        if (StackUtil.isValid(stack) && stack.getItem() instanceof ItemDrill) {
            ItemDrill.loadSlotsFromNBT(this.drillInventory, inventory.getCurrentItem());
        }
    }

    @Override
    public ItemStack transferStackInSlot(EntityPlayer player, int slot) {
        int inventoryStart = 5;
        int inventoryEnd = inventoryStart + 26;
        int hotbarStart = inventoryEnd + 1;
        int hotbarEnd = hotbarStart + 8;

        Slot theSlot = this.inventorySlots.get(slot);

        if (theSlot != null && theSlot.getHasStack()) {
            ItemStack newStack = theSlot.getStack();
            ItemStack currentStack = newStack.copy();

            //Other Slots in Inventory excluded
            if (slot >= inventoryStart) {
                //Shift from Inventory
                if (newStack.getItem() instanceof ItemDrillUpgrade) {
                    if (!this.mergeItemStack(newStack, 0, 5, false)) { return StackUtil.getEmpty(); }
                }
                //

                else if (slot >= inventoryStart && slot <= inventoryEnd) {
                    if (!this.mergeItemStack(newStack, hotbarStart, hotbarEnd + 1, false)) { return StackUtil.getEmpty(); }
                } else if (slot >= inventoryEnd + 1 && slot < hotbarEnd + 1 && !this.mergeItemStack(newStack, inventoryStart, inventoryEnd + 1, false)) { return StackUtil.getEmpty(); }
            } else if (!this.mergeItemStack(newStack, inventoryStart, hotbarEnd + 1, false)) { return StackUtil.getEmpty(); }

            if (!StackUtil.isValid(newStack)) {
                theSlot.putStack(StackUtil.getEmpty());
            } else {
                theSlot.onSlotChanged();
            }

            if (newStack.getCount() == currentStack.getCount()) { return StackUtil.getEmpty(); }
            theSlot.onTake(player, newStack);

            return currentStack;
        }
        return StackUtil.getEmpty();
    }

    @Override
    public ItemStack slotClick(int slotId, int dragType, ClickType clickTypeIn, EntityPlayer player) {
        if (clickTypeIn == ClickType.SWAP && dragType == this.inventory.currentItem) {
            return ItemStack.EMPTY;
        } else {
            return super.slotClick(slotId, dragType, clickTypeIn, player);
        }
    }

    @Override
    public void onContainerClosed(EntityPlayer player) {
        ItemStack stack = this.inventory.getCurrentItem();
        if (StackUtil.isValid(stack) && stack.getItem() instanceof ItemDrill) {
            ItemDrill.writeSlotsToNBT(this.drillInventory, this.inventory.getCurrentItem());
        }
        super.onContainerClosed(player);
    }

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