state_menu=klass()
function state_menu:init()
 self.selection=1
 self.frame=0
 self.options={
  menu_option:new(function() return "excavate" end,function() 
   main.state_manager:push(state_excavate_menu:new(self))
  end),
  menu_option:new(function() return "archaeology" end,function() 
   main.state_manager:push(state_archaeology:new())
  end),
  menu_option:new(),
  menu_option:new(function() 
   local pref=completion_tracker:get_music_preference()
   if (pref) return "stop music"
   return "start music"
  end,function()
   completion_tracker:set_music_preference(not completion_tracker:get_music_preference())
  end),
  menu_option:new(function() return "reset data" end,function()
   main.state_manager:push(state_reset_menu:new(self))
  end)
 }
end
function state_menu:enter() end
function state_menu:exit() end

function state_menu:reenter() 
 self.selection=1
end
function state_menu:suspend() 
 self.selection=nil
end

function state_menu:update()
 self.frame+=1
 self.frame%=1024
 if (btnp(1) or btnp(4)) sounds:menu() self.options[self.selection]:cb() return

 local vel=0
 if (btnp(2)) vel-=1
 if (btnp(3)) vel+=1
 if vel!=0 then
  while true do
   self.selection=(self.selection+vel-1)%#self.options+1
   if (self.options[self.selection].cb!=nil) break
  end
 end
end
function state_menu:draw()
 cls(13)
 self:draw_bg()
 local optionsh=1
 for o in all(self.options) do
  optionsh+=2
  if (o.cb) optionsh+=4
 end
 local totalh=optionsh+32
 local y=128-totalh-1--64-totalh\2
 -- rectfill(68,y,126,y+totalh-1,13)
 local y0=y
 spr(64,68,y,7,3)
 y+=22
 line(68,y,126,y,15)
 y+=2
 local optionsy=y+1
 rectfill(68,y,126,y+optionsh-1,4)
 y+=optionsh+1
 line(68,y,126,y,15)
 y+=2
 print("by pyrex & nyeo",68,y,15)

 local y1=y

 local x=69
 y=optionsy
 for i=1,#self.options do
  local o=self.options[i]
  if (self.selection==i) spr(71,x-7+cos(time())*0.5,y)
  local fg=13
  if (o.cb) fg=15
  if o.name then 
   print(o.name(),x,y,fg)
   y+=6
  else
   line(x-1,y,x+57,y,fg)
   y+=2
  end
 end

 -- metascore
 local metascore=completion_tracker:get_metascore()
 if metascore>0 then
  spr(72,66,y0-9,2,1)
  print("="..tostr(metascore,2),79,y0-6,6)
 end
end

function state_menu:draw_bg()
 pal(7,1)
 pal(13,1)
 local m=128-(self.frame/2)%128
 for col=-8,7 do
  for row=-3,7 do
   local realx=flr(col*32-row*16)+m
   local realy=flr(row*30-col*12)
   spr(76,realx,realy,4,4)
  end
 end
 pal()
end

menu_option=klass()
function menu_option:init(name,cb)
 self.name=name
 self.cb=cb
end