local MAX_TP_DOWN = 100

mcl_anticheat = {
	positions = {}
}

function mcl_anticheat.set_pos(player, pos)
	player:set_pos(pos)

	if player:is_player() then
		mcl_anticheat.positions[player] = pos
	end
end

minetest.register_on_joinplayer(function(player)
	mcl_anticheat.positions[player] = player:get_pos()
end)

minetest.register_on_leaveplayer(function(player)
	mcl_anticheat.positions[player] = nil
end)

minetest.register_globalstep(function()
	for _, player in pairs(minetest.get_connected_players()) do
		local pos = player:get_pos()
		local old_pos = mcl_anticheat.positions[player]

		if old_pos.y - pos.y > MAX_TP_DOWN and not player:get_attach() then
			player:set_pos(old_pos)
		else
			mcl_anticheat.positions[player] = pos
		end
	end

end)