game.LoadSkinSample('song_transition_screen/transition_enter.wav');

local bgImage = gfx.CreateSkinImage("songtransition/bg.png", 0)


local difficultyNumbers;

local difficultyLabelImages = {
    gfx.CreateSkinImage("songtransition/difficulty_labels/nov.png", 0),
    gfx.CreateSkinImage("songtransition/difficulty_labels/adv.png", 0),
    gfx.CreateSkinImage("songtransition/difficulty_labels/exh.png", 0),
    gfx.CreateSkinImage("songtransition/difficulty_labels/mxm.png", 0),
    gfx.CreateSkinImage("songtransition/difficulty_labels/inf.png", 0),
    gfx.CreateSkinImage("songtransition/difficulty_labels/grv.png", 0),
    gfx.CreateSkinImage("songtransition/difficulty_labels/hvn.png", 0),
    gfx.CreateSkinImage("songtransition/difficulty_labels/vvd.png", 0),
}

local transitionTimer = 0;
local outTimer = 0

local resx, resy = game.GetResolution()
local desw, desh -- The resolution of the deisign
local scale;

local noJacket = gfx.CreateSkinImage("song_select/loading.png", 0)

local wasEnterSfxPlayed = false;

function resetLayoutInformation()
    resx, resy = game.GetResolution()
    -- portrait = resy > resx
    -- desw = portrait and 1080 or 1920
    -- desh = desw * (resy / resx)
    desw = 1080
    desh = 1920
    scale = resx / desw
end

function load_number_image(path)
    local images = {}
    for i = 0, 9 do
        images[i + 1] = gfx.CreateSkinImage(string.format("%s/%d.png", path, i), 0)
    end
    return images
end

function draw_number(x, y, alpha, num, digits, images, is_dim, scale, kern)
    scale = scale or 1;
	kern = kern or 1;
	local tw, th = gfx.ImageSize(images[1])
	tw = tw * scale;
	th = th * scale;
    x = x + (tw * (digits - 1)) / 2
    y = y - th / 2
    for i = 1, digits do
        local mul = 10 ^ (i - 1)
        local digit = math.floor(num / mul) % 10
        local a = alpha
        if is_dim and num < mul then
            a = 0.4
        end
        gfx.BeginPath()
        gfx.ImageRect(x, y, tw, th, images[digit + 1], a, 0)
        x = x - (tw * kern)
    end
end

function render(deltaTime)
    if not wasEnterSfxPlayed then 
        game.PlaySample('song_transition_screen/transition_enter.wav');
        wasEnterSfxPlayed = true;
    end
    if not difficultyNumbers then
        difficultyNumbers = load_number_image('diff_num')
    end

    resetLayoutInformation()
    gfx.ResetTransform();
    gfx.Scale(scale, scale);

    render_screen(transitionTimer);
    
    transitionTimer = transitionTimer + deltaTime * 0.2
    transitionTimer = math.min(transitionTimer,1)

    if transitionTimer < 0.25 then
        local whiteAlpha = math.max(0, (1-transitionTimer/0.25))

        gfx.BeginPath();
        gfx.FillColor(255,255,255,math.floor(255*whiteAlpha));
        gfx.Rect(0,0,desw,desh);
        gfx.Fill();
        gfx.ClosePath();
    end

    if transitionTimer > 0.85 then
        local blackAlpha = math.min(1, ((transitionTimer-0.85)/0.15))

        gfx.BeginPath();
        gfx.FillColor(0,0,0,math.floor(255*blackAlpha));
        gfx.Rect(0,0,desw,desh);
        gfx.Fill();
        gfx.ClosePath();
    end

    return transitionTimer >= 1
end

function render_out(deltaTime)
    outTimer = outTimer + deltaTime * 0.2
    outTimer = math.min(outTimer, 1)

    return outTimer >= 1;
end

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

function render_screen(progress)
    gfx.ImageRect(0, 0, 1080, 1920, bgImage,1,0);

    
    local jacket = song.jacket == 0 and noJacket or song.jacket
    gfx.BeginPath();
    gfx.ImageRect(235, 385, 608, 608, jacket, 1, 0)
    gfx.ClosePath();

    

	gfx.TextAlign(gfx.TEXT_ALIGN_CENTER + gfx.TEXT_ALIGN_MIDDLE)
    
    gfx.FontSize(55)
    gfx.Text(song.title,desw/2, 1114)
    
    gfx.FontSize(30)
    gfx.Text(song.artist, desw/2 , 1182)
    
    
    local EFFECTOR_LABEL_Y = 1288
    local ILLUSTRATOR_LABEL_Y = 1347
    
    gfx.FontSize(22)

    gfx.Text(song.effector, desw/2+70 , EFFECTOR_LABEL_Y-1)
    gfx.Text(song.illustrator, desw/2+70 , ILLUSTRATOR_LABEL_Y-3)

    -- Draw song diff level
    gfx.BeginPath();
    draw_number(933, 1140, 1.0, song.level, 2, difficultyNumbers, false, 1, 1)

    -- Draw song diff label (NOV/ADV/EXH/MXM/etc.)
    gfx.BeginPath();
    local diffLabelImage = difficultyLabelImages[song.difficulty+1];
    local diffLabelW, diffLabelH = gfx.ImageSize(diffLabelImage);
    gfx.ImageRect(952-diffLabelW/2, 1154-diffLabelH/2, diffLabelW, diffLabelH, diffLabelImage,1,0);
    gfx.ClosePath();

    gfx.Save();
    gfx.FontSize(24)
    gfx.LoadSkinFont('Digital-Serial-Bold.ttf')
	gfx.TextAlign(gfx.TEXT_ALIGN_CENTER + gfx.TEXT_ALIGN_MIDDLE)
    gfx.BeginPath();

    gfx.Text('BPM', 127, 1140)
    gfx.Text(song.bpm, 127, 1167)

    gfx.ClosePath();
    gfx.Restore();

--     for i=0,resx/50 do
--         local dir = sign((i % 2) - 0.5)
--         local yoff = dir * resy * (1 - progress)
--         gfx.Save()
--         gfx.Translate(0,yoff)
--         gfx.BeginPath()
--         gfx.Rect(60 * i, yoff, 60, resy)
--         gfx.FillColor(0,64, 150 + 25 * dir)
--         gfx.Fill()
--         gfx.Restore()
--     end
--     local y = (resy/2 + 100) * (math.sin(0.5 * progress * math.pi)^7) - 200
--     gfx.Save()
--     gfx.BeginPath()
--     gfx.Translate(resx/2, y)
--     gfx.Restore()
--     gfx.Translate(resx/2, resy - y - 50)
--     gfx.FillColor(255,255,255)
--     gfx.TextAlign(gfx.TEXT_ALIGN_CENTER + gfx.TEXT_ALIGN_TOP)
--     gfx.FontSize(80)
--     gfx.Text(song.title,0,0)
--     gfx.FontSize(55)
--     gfx.Text(song.artist,0,80)
end

function reset()
    transitionTimer = 0
    resx, resy = game.GetResolution()
    outTimer = 0
    wasEnterSfxPlayed = false;
end