local maxStackSize = tonumber(minetest.settings:get("default_stack_max"))
local maxIncrement = function(stack1)
	return (maxStackSize - stack1:get_count()) * -1
end


local combineStack = function(stack1, stack2)
	if stack1:get_name() == stack2:get_name() then
		local count1 = stack1:get_count()
		local count2 = stack2:get_count()
		local newcount1 = count1 + count2
		local newcount2 = 0
		if newcount1 > maxStackSize then
			newcount2 = newcount1 - maxStackSize
			newcount1 = maxStackSize
		end
		minetest.debug(newcount1, newcount2)
		stack1:set_count(newcount1)
		stack2:set_count(newcount2)
		return stack1, stack2
	elseif stack1:get_name() == "" then
		return stack2, stack1
	else
		return stack1, stack2
	end
end


minetest.register_on_punchnode(function(position, node, puncher, pointed)
	local nodemeta = minetest.get_meta(position)
	local noderef = minetest.registered_nodes[node.name]
	if not noderef then return false end
	local wieldItem = puncher:get_wielded_item()
	local inventory = nodemeta:get_inventory()
	if not inventory then return false end
	
	local putfunc = noderef.allow_metadata_inventory_put
	for listName in pairs(inventory:get_lists()) do
		local transstack
		if putfunc then
			transstack = putfunc(position, listName, nil, wieldItem, puncher)
		else
			transstack = wieldItem:get_count()
		end
		if transstack ~= 0 then
			local leftover = inventory:add_item(listName, wieldItem)
			puncher:set_wielded_item(leftover)
			noderef.on_metadata_inventory_put(position, listName, nil, wieldItem, puncher)
			return
		end
	end
	
	local takefunc = noderef.allow_metadata_inventory_take
	for listName in pairs(inventory:get_lists()) do
		for index = 1, inventory:get_size(listName) do
			wieldItem = puncher:get_wielded_item()
			local item = inventory:get_stack(listName, index)
			if (wieldItem:get_name() == "" and item:get_name() ~= "") or wieldItem:get_name() == item:get_name() then
				local maxAmmount
				if not takefunc then
					maxAmmount = inventory:get_stack(listname, index):get_count()
				else
					maxAmmount = takefunc(position, listName, index, item, puncher)
				end
				local ammount = math.min(maxAmmount, maxIncrement(wieldItem))
				if ammount ~= 0 then
					local stack1, stack2 = combineStack(wieldItem, item)
					puncher:set_wielded_item(stack1)
					inventory:set_stack(listName, index, stack2)
					return
				end
			end
		end
	end
end)