techpack/tubelib_addons2/mesecons_converter.lua

--[[

	Tubelib Addons 2
	================

	Copyright (C) 2017 Joachim Stolberg

	LGPLv2.1+
	See LICENSE.txt for more information

	mesecons_converter.lua:
	
]]--

local OVER_LOAD_MAX = 5

local function formspec(meta)
	local numbers = meta:get_string("numbers")
	return "size[7,5]"..
		"field[0.5,2;6,1;number;Destination node numbers;"..numbers.."]" ..
		"button_exit[1,3;2,1;exit;Save]"
end	

local function send_message(pos, topic, payload)
	local meta = minetest.get_meta(pos)
	local owner = meta:get_string("owner")
	local numbers = meta:get_string("numbers")
	local overload_cnt = meta:get_int("overload_cnt") + 1
	meta:set_int("overload_cnt", overload_cnt)
	if overload_cnt > OVER_LOAD_MAX then
		local own_number = meta:get_string("own_number")
		meta:set_string("infotext", "Tubelib Mesecons Converter "..own_number..": fault (overloaded)")
		minetest.get_node_timer(pos):stop()
		return
	else
		if topic == "change" then
			topic = meta:get_string("state") == "on" and "off" or "on"
		end
		tubelib.send_message(numbers, owner, nil, topic, payload)
	end
	meta:set_string("state", topic)
end

minetest.register_node("tubelib_addons2:mesecons_converter", {
	description = "Tubelib Mesecons Converter",
	tiles = {
		-- up, down, right, left, back, front
		'tubelib_front.png',
		'tubelib_front.png',
		'tubelib_front.png^tubelib_addon2_mesecons_converter.png',
	},

	after_place_node = function(pos, placer)
		local meta = minetest.get_meta(pos)
		local own_number = tubelib.add_node(pos, "tubelib_addons2:mesecons_converter")
		meta:set_string("own_number", own_number)
		meta:set_string("formspec", formspec(meta))
		meta:set_string("infotext", "Tubelib Mesecons Converter "..own_number..": not connected")
		meta:set_string("owner", placer:get_player_name())
		-- send_message is called 24 times after the node is placed
		meta:set_int("overload_cnt", -24)
		minetest.get_node_timer(pos):start(1)
	end,

	on_receive_fields = function(pos, formname, fields, player)
		local meta = minetest.get_meta(pos)
		local owner = meta:get_string("owner")
		if owner ~= player:get_player_name() then
			return
		end
		
		if tubelib.check_numbers(fields.number) then
			meta:set_string("numbers", fields.number)
			local own_number = meta:get_string("own_number")
			meta:set_string("infotext", "Tubelib Mesecons Converter "..own_number..": connected with "..fields.number)
			meta:set_string("formspec", formspec(meta))
		end
		
		local timer = minetest.get_node_timer(pos)
		if not timer:is_started() then
			timer:start(1)
		end
	end,
	
	mesecons = {
		receptor = {
			state = mesecon.state.off,
			rules = mesecon.rules.default,
		},
		effector = {
			rules = mesecon.rules.default,
			action_on = function (pos, node)
				local meta = minetest.get_meta(pos)
				local own_number = meta:get_string("own_number")
				send_message(pos, "on", own_number)
			end,
			action_off = function (pos, node)
				local meta = minetest.get_meta(pos)
				local own_number = meta:get_string("own_number")
				send_message(pos, "off", own_number)
			end,
			action_change = function (pos, node)
				local meta = minetest.get_meta(pos)
				local own_number = meta:get_string("own_number")
				send_message(pos, "change", own_number)
			end,
		}
	},
	
	on_timer = function(pos,elapsed)
		local meta = minetest.get_meta(pos)
		meta:set_int("overload_cnt", 0)
		return true
	end,
	
	after_dig_node = function(pos)
		tubelib.remove_node(pos)
	end,

	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	groups = {choppy=2, cracky=2, crumbly=2},
	is_ground_content = false,
	sounds = default.node_sound_stone_defaults(),
})


minetest.register_craft({
	output = "tubelib_addons2:mesecons_converter",
	recipe = {
		{"tubelib:button", "mesecons:wire_00000000_off"},
	},
})

tubelib.register_node("tubelib_addons2:mesecons_converter", {}, {
	on_recv_message = function(pos, topic, payload)
		if topic == "on" then
			mesecon.receptor_on(pos, mesecon.rules.default)
		elseif topic == "off" then
			mesecon.receptor_off(pos, mesecon.rules.default)
		elseif topic == "set_numbers" then
			local meta = minetest.get_meta(pos)
			local own_number = meta:get_string("own_number")
			meta:set_string("infotext", "Tubelib Mesecons Converter "..own_number..": connected with "..payload)
			meta:set_string("numbers", payload)
			meta:set_string("formspec", formspec(meta))
		end
		return true
	end,
})