-- LUALOCALS < ---------------------------------------------------------
local minetest, pairs, tonumber
    = minetest, pairs, tonumber
-- LUALOCALS > ---------------------------------------------------------

local modname = minetest.get_current_modname()

local invert = minetest.settings:get_bool(modname .. "_invert")
local timeout = tonumber(minetest.settings:get(modname .. "_timeout")) or 600
local reason = minetest.settings:get(modname .. "_reason") or "idle timeout"

minetest.register_privilege(modname, {
		description = (invert and "Kick" or "Do not kick") .. " this player when idle",
		give_to_singleplayer = false,
		give_to_admin = false
	})

local times = {}

local function now() return minetest.get_us_time() / 1000000 end
local function bumpn(pname) times[pname] = now() return pname end
local function bump(player)
	if not (player and player.get_player_name) then return end
	local pname = player:get_player_name()
	if not pname then return end
	return bumpn(pname)
end

minetest.register_on_joinplayer(function(player) return bump(player) end)
minetest.register_on_placenode(function(_, _, player)
		--do not return
		bump(player)
	end)
minetest.register_on_dignode(function(_, _, player) return bump(player) end)
minetest.register_on_punchnode(function(_, _, player) return bump(player) end)
minetest.register_on_chat_message(function(pname) bumpn(pname) end)
minetest.register_on_player_receive_fields(function(player) return bump(player) end)
minetest.register_on_craft(function(_, player) bump(player) end)
minetest.register_on_player_inventory_action(function(player) return bump(player) end)

local looks = {}
local ctlbits = {}
local function checkplayer(player)
	local pname = player:get_player_name()
	local bits = player:get_player_control_bits()
	local oldbits = ctlbits[pname]
	ctlbits[pname] = bits
	local look = player:get_look_dir()
	local oldlook = looks[pname]
	looks[pname] = oldlook
	if not (oldbits == bits and oldlook and vector.distance(look, oldlook) < 0.001)
	then return bumpn(pname) end
	return pname
end
minetest.register_globalstep(function()
		for _, player in pairs(minetest.get_connected_players()) do
			if (not minetest.check_player_privs(player, modname)) ~= (not invert) then return end
			local pname = checkplayer(player)
			if times[pname] < now() - timeout then
				minetest.kick_player(pname, reason)
			end
		end
	end)