--[[

	Tube Library
	============

	Copyright (C) 2017 Joachim Stolberg

	LGPLv2.1+
	See LICENSE.txt for more information

	pusher.lua:
	Simple node for push/pull operation of StackItems from chests or other
	inventory/server nodes to tubes or other inventory/server nodes.
	The Pusher supports the following messages:
	 - topic = "start", payload  = nil
	 - topic = "stop" , payload  = nil

]]--

local function switch_on(pos, node)
	local meta = minetest.get_meta(pos)
	local number = meta:get_string("number")
	meta:set_int("running", 1)
	meta:set_string("infotext", "Pusher "..number..": running")
	node.name = "tubelib:pusher_active"
	minetest.swap_node(pos, node)
	minetest.get_node_timer(pos):start(2)
end	

local function switch_off(pos, node)
	local meta = minetest.get_meta(pos)
	local number = meta:get_string("number")
	meta:set_int("running", 0)
	meta:set_string("infotext", "Pusher "..number..": stopped")
	node.name = "tubelib:pusher"
	minetest.swap_node(pos, node)
	minetest.get_node_timer(pos):stop()
end	


local function keep_running(pos, elapsed)
	local meta = minetest.get_meta(pos)
	local number = meta:get_string("number")
	local facedir = meta:get_int("facedir")
	local items = tubelib.pull_items(pos, facedir, "L")						-- <<=== tubelib
	if items ~= nil then
		if tubelib.push_items(pos, facedir, "R", items) == false then		-- <<=== tubelib
			-- place item back
			tubelib.push_items(pos, facedir, "L", items)					-- <<=== tubelib
			meta:set_string("infotext", "Pusher "..number..": blocked")
		else
			meta:set_string("infotext", "Pusher "..number..": running")
		end
	else
		meta:set_string("infotext", "Pusher "..number..": unloaded")
	end
	return true
end

minetest.register_node("tubelib:pusher", {
	description = "Tubelib Pusher",
	tiles = {
		-- up, down, right, left, back, front
		'tubelib_pusher1.png',
		'tubelib_pusher1.png',
		'tubelib_outp.png',
		'tubelib_inp.png',
		"tubelib_pusher1.png^[transformR180]",
		"tubelib_pusher1.png",
	},

	after_place_node = function(pos, placer)
		local meta = minetest.get_meta(pos)
		local number = tubelib.get_node_number(pos, "tubelib:pusher")			-- <<=== tubelib
		local facedir = minetest.dir_to_facedir(placer:get_look_dir(), false)
		meta:set_int("facedir", facedir)
		meta:set_string("number", number)
		meta:set_string("infotext", "Pusher "..number..": stopped")
	end,

	on_rightclick = function(pos, node, clicker)
		if not minetest.is_protected(pos, clicker:get_player_name()) then
			switch_on(pos, node)
		end
	end,

	after_dig_node = function(pos)
		tubelib.remove_node(pos)												-- <<=== tubelib
	end,

	paramtype2 = "facedir",
	groups = {cracky=1},
	is_ground_content = false,
})


minetest.register_node("tubelib:pusher_active", {
	description = "Tubelib Pusher",
	tiles = {
		-- up, down, right, left, back, front
		{
			image = "tubelib_pusher.png",
			backface_culling = false,
			animation = {
				type = "vertical_frames",
				aspect_w = 32,
				aspect_h = 32,
				length = 2.0,
			},
		},
		{
			image = "tubelib_pusher.png",
			backface_culling = false,
			animation = {
				type = "vertical_frames",
				aspect_w = 32,
				aspect_h = 32,
				length = 2.0,
			},
		},
		'tubelib_outp.png',
		'tubelib_inp.png',
		{
			image = "tubelib_pusher.png^[transformR180]",
			backface_culling = false,
			animation = {
				type = "vertical_frames",
				aspect_w = 32,
				aspect_h = 32,
				length = 2.0,
			},
		},
		{
			image = "tubelib_pusher.png",
			backface_culling = false,
			animation = {
				type = "vertical_frames",
				aspect_w = 32,
				aspect_h = 32,
				length = 2.0,
			},
		},
	},

	on_rightclick = function(pos, node, clicker)
		if not minetest.is_protected(pos, clicker:get_player_name()) then
			switch_off(pos, node)
		end
	end,
	
	on_timer = keep_running,
	
	paramtype2 = "facedir",
	groups = {crumbly=0, not_in_creative_inventory=1},
	is_ground_content = false,
})

minetest.register_craft({
	output = "tubelib:pusher 2",
	recipe = {
		{"group:wood", 		"wool:dark_green",   	"group:wood"},
		{"tubelib:tube1", 	"default:mese_crystal",	"tubelib:tube1"},
		{"group:wood", 		"wool:dark_green",   	"group:wood"},
	},
})

--------------------------------------------------------------- tubelib
tubelib.register_node("tubelib:pusher", {"tubelib:pusher_active"}, {
	on_pull_item = nil,
	on_push_item = nil,
	on_recv_message = function(pos, topic, payload)
		local node = minetest.get_node(pos)
		if topic == "start" then
			switch_on(pos, node)
		elseif topic == "stop" then
			switch_off(pos, node)
		end
	end,
})	
--------------------------------------------------------------- tubelib