--[[

	sl_controller
	=============

	Copyright (C) 2018-2019 Joachim Stolberg

	LGPLv2.1+
	See LICENSE.txt for more information

	terminal.lua:
	
]]--

local HELP = [[#### SmartLine Controller Terminal ####

Send commands to your Controller
and output text messages from your
Controller to the Terminal.

Commands can have up to 80 characters.
Local commands:
- cls        = clear screen
- help     = this message 
- pub      = switch to public use
- priv      = switch to private use
]]

local function formspec1()
	return "size[6,4]"..
	default.gui_bg..
	default.gui_bg_img..
	default.gui_slots..
	"field[0.5,1;5,1;number;SaferLua Controller number:;]" ..
	"button_exit[1.5,2.5;2,1;exit;Save]"
end

local function formspec2(meta)
	local output = meta:get_string("output")
	output = minetest.formspec_escape(output)
	output = output:gsub("\n", ",")
	return "size[9,8]"..
	default.gui_bg..
	default.gui_bg_img..
	default.gui_slots..
	"table[0.1,0.1;8.6,6.6;output;"..output..";200]"..
	"field[0.5,7.6;6,1;cmnd;Enter command;]" ..
	"field_close_on_enter[cmnd;false]"..
	"button[6.7,7.3;2,1;ok;Enter]"
end

local function output(pos, text)
	local meta = minetest.get_meta(pos)
	text = meta:get_string("output") .. "\n" .. (text or "")
	text = text:sub(-500,-1)
	meta:set_string("output", text)
	meta:set_string("formspec", formspec2(meta))

end

local function command(pos, cmnd, player)
	local meta = minetest.get_meta(pos)
	local owner = meta:get_string("owner") or ""
	if cmnd then
		cmnd = cmnd:sub(1,80)
		
		if cmnd == "cls" then
			meta:set_string("output", "")
			meta:set_string("formspec", formspec2(meta))
		elseif cmnd == "help" then
			local meta = minetest.get_meta(pos)
			meta:set_string("output", HELP)
			meta:set_string("formspec", formspec2(meta))
		elseif cmnd == "pub" and owner == player then
			meta:set_int("public", 1)
			output(pos, player..":$ "..cmnd)
			output(pos, "Switched to public use!")
		elseif cmnd == "priv" and owner == player then
			meta:set_int("public", 0)
			output(pos, player..":$ "..cmnd)
			output(pos, "Switched to private use!")
		elseif meta:get_int("public") == 1 or owner == player then
			local number = meta:get_string("number") or "0000"
			output(pos, player..":$ "..cmnd)
			tubelib.send_message(number, owner, nil, "term", cmnd)
		end
	end
end	

minetest.register_node("sl_controller:terminal", {
	description = "SaferLua Controller Terminal",
	tiles = {
		-- up, down, right, left, back, front
		'sl_controller_terminal_top.png',
		'sl_controller_terminal_bottom.png',
		'sl_controller_terminal_side.png',
		'sl_controller_terminal_side.png',
		'sl_controller_terminal_bottom.png',
		"sl_controller_terminal_front.png",
	},

	drawtype = "nodebox",
	node_box = {
		type = "fixed",
		fixed = {
			{-12/32, -16/32,  -8/32,  12/32, -14/32, 12/32},
			{-12/32, -14/32,  12/32,  12/32,   6/32, 14/32},
		},
	},
	
	after_place_node = function(pos, placer)
		local number = tubelib.add_node(pos, "sl_controller:terminal")
		local meta = minetest.get_meta(pos)
		meta:set_string("own_number", number)
		meta:set_string("formspec", formspec1())
		meta:set_string("owner", placer:get_player_name())
		meta:set_string("infotext", "SaferLua Controller Terminal "..number..": not connected")
	end,

	on_receive_fields = function(pos, formname, fields, player)
		local meta = minetest.get_meta(pos)
		if fields.number and fields.number ~= "" then
			if tubelib.check_numbers(fields.number) then
				meta:set_string("number", fields.number)
				local own_number = meta:get_string("own_number")
				meta:set_string("infotext", "SaferLua Controller Terminal "..own_number..": connected with "..fields.number)
				meta:set_string("formspec", formspec2(meta))
			end
		elseif (fields.key_enter == "true" or fields.ok == "Enter") and fields.cmnd ~= "" then
			command(pos, fields.cmnd, player:get_player_name())
		end
	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_metal_defaults(),
})


minetest.register_craft({
	output = "sl_controller:terminal",
	recipe = {
		{"", "smartline:display", ""},
		{"", "", ""},
		{"dye:black", "tubelib:wlanchip", "default:copper_ingot"},
	},
})

tubelib.register_node("sl_controller:terminal", {}, {
	on_recv_message = function(pos, topic, payload)
		if topic == "term" then
			output(pos, payload)
			return true
		end
	end,
})