function init_menu()
   -- add pause menu items first
   menuitem(1, "save game", save_game)
   menuitem(2, "erase save data", clear_save)

   menu_cursor = 0

   menu_map = {
      [0] = nil,
      [1] = nil,
      [2] = save_game
   }
end

function menu_input()
   if btnp(5) then
      menu_mode = false
   end

    -- todo: implement an actual menu control
end

function draw_menu()
   menu_draw_inventory()

   menu_draw_options()
end

function menu_draw_inventory()
   rectfill(0,0,64,64,1)
   rect(0,0,64,64,5)

   local inv_cursor = 0
   for k,v in pairs(inventory) do
      if v > 0 then
         spr(k, 8, 8+inv_cursor*8)
         print(v, 18, 8+inv_cursor*8, 15)
      end
   end
end

function menu_draw_options()
   rectfill(80, 0, 127, 64, 1)
   rect(80, 0, 127, 64, 5)
   cursor(96, 8)
   color(15)
   print("eat")
   print("build")
   print("save")

   -- cursor
   print("->", 84, 8+menu_cursor*6)
end