local ui_get, entity_get_local_player, entity_get_prop, bit_band, globals_realtime = ui.get, entity.get_local_player, entity.get_prop, bit.band, globals.realtime
local FL_ONGROUND = 1
local onground_prev = true

local DURATION = 0.1
local duck_until
local edge_jump_enabled_reference, edge_jump_hotkey_reference = ui.reference("MISC", "Miscellaneous", "Jump at edge")

client.set_event_callback("setup_command", function(cmd)
	if ui_get(edge_jump_enabled_reference) and ui_get(edge_jump_hotkey_reference) then
		local onground = bit_band(entity_get_prop(entity_get_local_player(), "m_fFlags"), FL_ONGROUND) == FL_ONGROUND
		if cmd.in_duck == 0 then
			if onground_prev and not onground then
				duck_until = globals_realtime()+DURATION
			end
			if duck_until ~= nil and duck_until > globals_realtime() then
				cmd.in_duck = 1
			end
		end
		onground_prev = onground
	end
end)