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

    local enterAnimTickRes = gfx.TickAnimation(transitionEnterAnimation, deltaTime);
    
    if enterAnimTickRes == 0 then
        gfx.GlobalAlpha(0);
    else
        if not wasEnterSfxPlayed then 
            game.PlaySample('transition_screen/transition_enter.wav');
            wasEnterSfxPlayed = true;
        end
        gfx.BeginPath();
        gfx.ImageRect(0, 0, resx, resy, transitionEnterAnimation, 1, 0);
        gfx.GlobalAlpha(1);
        
        -- debug
        -- gfx.Text('DELTA: ' .. deltaTime .. ' // TIMER: ' .. timer .. ' // TIMER_OUT: ' .. outTimer, 255,255);
        timer = timer + (deltaTime / 3);
    end
    

    if timer >= 1 then return true end;
end

function render_out(deltaTime)
    local leaveAnimeTickRes = gfx.TickAnimation(transitionLeaveAnimation, deltaTime);

    if leaveAnimeTickRes == 0 then
        gfx.BeginPath();
	    gfx.ImageRect(0, 0, resx, resy, transitionEnterAnimation, 1, 0);
    else
        if not wasLeaveSfxPlayed then 
            game.PlaySample('transition_screen/transition_leave.wav');
            wasLeaveSfxPlayed = true;
        end

        gfx.BeginPath();
        gfx.ImageRect(0, 0, resx, resy, transitionLeaveAnimation, 1, 0);
        outTimer = outTimer + (1/60) / 0.5
    end


    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