local doc_identifier = {}
doc_identifier.huds = {}
doc_identifier.countdown_ids = {}

doc_identifier.identify = function(itemstack, user, pointed_thing)
	local username = user:get_player_name()
	local show_error = function(username, itype)
		local message
		if itype == "item" then
			message = "The identification tool was unable to extract information from this item."
		elseif itype == "node" then
			message = "The identification tool was unable to extract information from this block."
		end
		minetest.show_formspec(
			username,
			"doc_identifier:error_missing_item_info",
			"size[12,2;]label[0,0.2;"..minetest.formspec_escape(message).."]button_exit[4.5,1.5;3,1;okay;OK]"
		)
	end
	if pointed_thing.type == "node" then
		local pos = pointed_thing.under
		local node = minetest.get_node(pos)
		if minetest.registered_nodes[node.name] ~= nil then
			local nodedef = minetest.registered_nodes[node.name]
			if(node.name == "ignore") then
				show_error(username, "node")
			end
			if doc.entry_exists("nodes", node.name) then
				doc.show_entry(username, "nodes", node.name)
			else
				show_error(username, "node")
			end
		end
	elseif pointed_thing.type == "object" then
		local object = pointed_thing.ref
		local le = object:get_luaentity()
		if object:is_player() then
			-- TODO: Players
		elseif le ~= nil then
			-- Dropped items
			if le.name == "__builtin:item" then
				local itemstring = ItemStack(minetest.deserialize(le:get_staticdata()).itemstring):get_name()
				if doc.entry_exists("nodes", itemstring) then
					doc.show_entry(username, "nodes", itemstring)
				elseif doc.entry_exists("tools", itemstring) then
					doc.show_entry(username, "tools", itemstring)
				elseif doc.entry_exists("craftitems", itemstring) then
					doc.show_entry(username, "craftitems", itemstring)
				else
					show_error(username, "item")
				end
			end
		end
	end
	return itemstack
end

function doc_identifier.solid_mode(itemstack, user, pointed_thing)
	return ItemStack("doc_identifier:identifier_solid")
end

function doc_identifier.liquid_mode(itemstack, user, pointed_thing)
	return ItemStack("doc_identifier:identifier_liquid")
end

minetest.register_tool("doc_identifier:identifier_solid", {
	description = "Identification tool",
	tool_capabilities = {},
	range = 10,
	wield_image = "doc_identifier_identifier.png",
	inventory_image = "doc_identifier_identifier.png",
	liquids_pointable = false,
	on_use = doc_identifier.identify,
	on_place = doc_identifier.liquid_mode,
	on_secondary_use = doc_identifier.liquid_mode,
})
minetest.register_tool("doc_identifier:identifier_liquid", {
	description = "Identification tool",
	tool_capabilities = {},
	range = 10,
	groups = { not_in_creative_inventory = 1 },
	wield_image = "doc_identifier_identifier_liquid.png",
	inventory_image = "doc_identifier_identifier_liquid.png",
	liquids_pointable = true,
	on_use = doc_identifier.identify,
	on_place = doc_identifier.solid_mode,
	on_secondary_use = doc_identifier.solid_mode,
})

minetest.register_craft({
	output = "doc_identifier:identifier_solid",
	recipe = { {"group:stick", "group:stick" },
		   {"", "group:stick"},
		   {"group:stick", ""} }
})

if minetest.get_modpath("default") ~= nil then
	minetest.register_craft({
		output = "doc_identifier:identifier_solid",
		recipe = { { "default:glass" }, 
			   { "group:stick" } }
	})
end

minetest.register_alias("doc_identifier:identifier", "doc_identifier:identifier_solid")

-- Add documentation
doc.sub.items.set_items_longdesc(
	{ ["doc_identifier:identifier_solid"] = "This useful little helper can be used to quickly learn more about about one's closer environment. It identifies and analyzes blocks and dropped items and it shows extensive information about the item on which it is used." })
doc.sub.items.set_items_usagehelp(
	{ ["doc_identifier:identifier_solid"] = "Punch any block or item about you wish to learn more about. This will open up the Documentation System entry of this particular item. The tool comes in two modes which are changed by a rightclick. In liquid mode (blue) this tool points to liquids as well while in solid mode (red) this is not the case. Liquid mode is required if you want to identify a liquid." })