local transitionEnterAnimation;
local transitionLeaveAnimation;

local resx, resy = game.GetResolution()

local timer = 0;
local outTimer = 0;

local wasEnterSfxPlayed = false;
local wasLeaveSfxPlayed = false;

game.LoadSkinSample('transition_screen/transition_enter.wav');
game.LoadSkinSample('transition_screen/transition_leave.wav');

function loadAnimations()
    transitionEnterAnimation = gfx.LoadSkinAnimation('transition/transition_frames/enter', 1/60, 1, false);
    transitionLeaveAnimation = gfx.LoadSkinAnimation('transition/transition_frames/leave', 1/60, 1, false);
end

function render(deltaTime)
    if not transitionEnterAnimation then
        loadAnimations()
    end

    if not wasEnterSfxPlayed then 
        game.PlaySample('transition_screen/transition_enter.wav');
        wasEnterSfxPlayed = true;
    end

    BREAKPOINT_INVISIBLE = 0.27;
    BREAKPOINT_VISIBLE = BREAKPOINT_INVISIBLE + 0.05;

    
    if timer < BREAKPOINT_INVISIBLE then
        gfx.GlobalAlpha(0);
    elseif (timer >= BREAKPOINT_INVISIBLE and timer < BREAKPOINT_VISIBLE) then
        gfx.GlobalAlpha((timer-BREAKPOINT_INVISIBLE) * (1/(BREAKPOINT_VISIBLE-BREAKPOINT_INVISIBLE)));
    else
        gfx.GlobalAlpha(1);
    end
    
	gfx.ImageRect(0, 0, resx, resy, transitionEnterAnimation, 1, 0);
    gfx.TickAnimation(transitionEnterAnimation, deltaTime);
    gfx.GlobalAlpha(1);
    
    -- debug
    -- gfx.Text('DELTA: ' .. deltaTime .. ' // TIMER: ' .. timer .. ' // TIMER_OUT: ' .. outTimer, 255,255);
    timer = timer + (deltaTime / 3);

    if timer >= 1 then return true end;
end

function render_out(deltaTime)
    if not wasLeaveSfxPlayed then 
        game.PlaySample('transition_screen/transition_leave.wav');
        wasLeaveSfxPlayed = true;
    end

	gfx.ImageRect(0, 0, resx, resy, transitionLeaveAnimation, 1, 0);
    gfx.TickAnimation(transitionLeaveAnimation, deltaTime);

    outTimer = outTimer + (1/60) / 0.5

    if outTimer >= 1 then
        return true;
    end

end

function sign(x)
  return x>0 and 1 or x<0 and -1 or 0
end


function reset()
    resx, resy = game.GetResolution();
    timer = 0;
    outTimer = 0;

    transitionEnterAnimation = nil;
    transitionLeaveAnimation = nil;

    wasEnterSfxPlayed = false;
    wasLeaveSfxPlayed = false;
end