public virtual ItemStack SlotClick(int par1, int par2, bool par3, EntityPlayer par4EntityPlayer)
{
ItemStack itemstack = null;
if (par2 > 1)
{
return(null);
}
if (par2 == 0 || par2 == 1)
{
InventoryPlayer inventoryplayer = par4EntityPlayer.Inventory;
if (par1 == -999)
{
if (inventoryplayer.GetItemStack() != null && par1 == -999)
{
if (par2 == 0)
{
par4EntityPlayer.DropPlayerItem(inventoryplayer.GetItemStack());
inventoryplayer.SetItemStack(null);
}
if (par2 == 1)
{
par4EntityPlayer.DropPlayerItem(inventoryplayer.GetItemStack().SplitStack(1));
if (inventoryplayer.GetItemStack().StackSize == 0)
{
inventoryplayer.SetItemStack(null);
}
}
}
}
else if (par3)
{
ItemStack itemstack1 = TransferStackInSlot(par1);
if (itemstack1 != null)
{
int i = itemstack1.ItemID;
itemstack = itemstack1.Copy();
Slot slot1 = InventorySlots[par1];
if (slot1 != null && slot1.GetStack() != null && slot1.GetStack().ItemID == i)
{
RetrySlotClick(par1, par2, par3, par4EntityPlayer);
}
}
}
else
{
if (par1 < 0)
{
return(null);
}
Slot slot = InventorySlots[par1];
if (slot != null)
{
slot.OnSlotChanged();
ItemStack itemstack2 = slot.GetStack();
ItemStack itemstack4 = inventoryplayer.GetItemStack();
if (itemstack2 != null)
{
itemstack = itemstack2.Copy();
}
if (itemstack2 == null)
{
if (itemstack4 != null && slot.IsItemValid(itemstack4))
{
int j = par2 != 0 ? 1 : itemstack4.StackSize;
if (j > slot.GetSlotStackLimit())
{
j = slot.GetSlotStackLimit();
}
slot.PutStack(itemstack4.SplitStack(j));
if (itemstack4.StackSize == 0)
{
inventoryplayer.SetItemStack(null);
}
}
}
else if (itemstack4 == null)
{
int k = par2 != 0 ? (itemstack2.StackSize + 1) / 2 : itemstack2.StackSize;
ItemStack itemstack6 = slot.DecrStackSize(k);
inventoryplayer.SetItemStack(itemstack6);
if (itemstack2.StackSize == 0)
{
slot.PutStack(null);
}
slot.OnPickupFromSlot(inventoryplayer.GetItemStack());
}
else if (slot.IsItemValid(itemstack4))
{
if (itemstack2.ItemID != itemstack4.ItemID || itemstack2.GetHasSubtypes() && itemstack2.GetItemDamage() != itemstack4.GetItemDamage() || !ItemStack.Func_46154_a(itemstack2, itemstack4))
{
if (itemstack4.StackSize <= slot.GetSlotStackLimit())
{
ItemStack itemstack5 = itemstack2;
slot.PutStack(itemstack4);
inventoryplayer.SetItemStack(itemstack5);
}
}
else
{
int l = par2 != 0 ? 1 : itemstack4.StackSize;
if (l > slot.GetSlotStackLimit() - itemstack2.StackSize)
{
l = slot.GetSlotStackLimit() - itemstack2.StackSize;
}
if (l > itemstack4.GetMaxStackSize() - itemstack2.StackSize)
{
l = itemstack4.GetMaxStackSize() - itemstack2.StackSize;
}
itemstack4.SplitStack(l);
if (itemstack4.StackSize == 0)
{
inventoryplayer.SetItemStack(null);
}
itemstack2.StackSize += l;
}
}
else if (itemstack2.ItemID == itemstack4.ItemID && itemstack4.GetMaxStackSize() > 1 && (!itemstack2.GetHasSubtypes() || itemstack2.GetItemDamage() == itemstack4.GetItemDamage()) && ItemStack.Func_46154_a(itemstack2, itemstack4))
{
int i1 = itemstack2.StackSize;
if (i1 > 0 && i1 + itemstack4.StackSize <= itemstack4.GetMaxStackSize())
{
itemstack4.StackSize += i1;
ItemStack itemstack3 = slot.DecrStackSize(i1);
if (itemstack3.StackSize == 0)
{
slot.PutStack(null);
}
slot.OnPickupFromSlot(inventoryplayer.GetItemStack());
}
}
}
}
}
return(itemstack);
}