-- Interval between movement checks (in seconds).
local INTERVAL = 5

-- Minimum distance to move to register as not AFK (in blocks).
local MINDIST = 0.2

-- If player does not move within this time, kick player (in seconds).
local TIMEOUT = 3600 -- 60 minutes

local time_afk = { }
local last_pos = { }

local function check_moved()
	for _, p in ipairs(minetest.get_connected_players()) do
		local plname = p:get_player_name()
		local pos = p:get_pos()
		local kicked
		if last_pos[plname] then
			local d = vector.distance(last_pos[plname], pos)
			--print("Player: "..plname..", Dist: "..d)
			if d < MINDIST then
				time_afk[plname] = (time_afk[plname] or 0) + INTERVAL
				if time_afk[plname] >= TIMEOUT then
					minetest.kick_player(plname, "Inactive for "..TIMEOUT.." seconds.")
					kicked = true
				end
			else
				time_afk[plname] = 0
			end
		end
		if not kicked then
			last_pos[plname] = pos
		end
	end
	minetest.after(INTERVAL, check_moved)
end
minetest.after(INTERVAL, check_moved)

minetest.register_on_leaveplayer(
	function(player)
		local plname = player:get_player_name()
		time_afk[plname] = nil
		last_pos[plname] = nil
	end)

minetest.log("action", "[player_inactive] loaded.")