local Theme = { };

--

Theme.Settings = { };

-- Theme Settings

Theme.Settings.Color = { ['R'] = 255; ['G'] = 255; ['B'] = 255; ['A'] = 255; }; --// Red, Green, Blue, Alpha/Transparency.
Theme.Settings.Rainbow = true; --// If true then it will ignore Settings.Color. If false then the menus color will stick to Settings.Color.
Theme.Settings.TransitionSpeed = 10; --// Indicates how many secounds it should take to transition all the way through the colors.
Theme.Settings.Fps = 60; --// Just set your usual fps and it should alighn the transition speed pretty acuratly.

-- SetColor

function Theme:SetColor( Color )
    local R, G, B, Alpha = math.floor( tonumber( Color.R ) ), math.floor( tonumber( Color.G ) ), math.floor( tonumber( Color.B ) ), math.floor( tonumber( Color.A ) );

    menu.set_color(menu_color.FrameBgActive, R, G, B);

    menu.set_color(menu_color.SliderGrab, R, G, B);
    menu.set_color(menu_color.SliderGrabActive, R, G, B);

    menu.set_color(menu_color.CheckMark, R, G, B);

    menu.set_color(menu_color.ScrollbarGrab, R, G, B);
    menu.set_color(menu_color.ScrollbarGrabHovered, R, G, B);
    menu.set_color(menu_color.ScrollbarGrabActive, R, G, B);

    menu.set_widget_color(menu_widget_color.Icons, R, G, B, Alpha);
    menu.set_widget_color(menu_widget_color.ScrollbarGrab, R, G, B, Alpha );
    menu.set_widget_color(menu_widget_color.ScrollbarGrabHovered, R, G, B, Alpha);
    menu.set_widget_color(menu_widget_color.ScrollbarGrabActive, R, G, B, Alpha);

    menu.set_widget_color(menu_widget_color.TitleName, R, G, B, Alpha);
    menu.set_widget_color(menu_widget_color.NotifyRectLine, R, G, B, Alpha);
    menu.set_widget_color(menu_widget_color.NotifyIcon, R, G, B, Alpha);
    menu.set_widget_color(menu_widget_color.NotifyDefault, R, G, B, Alpha);
    menu.set_widget_color(menu_widget_color.NotifySuccess, R, G, B, Alpha);

    menu.set_alpha( Alpha );
end;

-- GetNextColor

function Theme:GetNextColor( InitPoint )
    local function GetPositiveAngleDiff( a, b )
        return a < b and a + 360 - b or a - b;
    end;

    local Angle = InitPoint * 360;
    local Color = { };

    for i = 1, 3 do
        local Start = ( ( i + 1 ) * 120 ) % 360;
        local DiffFromStart = GetPositiveAngleDiff( Angle, Start );

        if DiffFromStart < 60 then
            Color[i] = DiffFromStart / 60 * 255;
        elseif DiffFromStart <= 180 then
            Color[i] = 255;
        elseif DiffFromStart < 240 then
            Color[i] = ( 240 - DiffFromStart ) / 60 * 255;
        else
            Color[i] = 0;
        end;
    end;

    return Color[1], Color[2], Color[3];
end

-- OnDone

function OnDone( )
    menu.restore_styles( );
end;

-- OnFrame

function OnFrame()
    if Theme.Settings.Rainbow and menu.is_menu_opened( ) then
        local Hue = ( system.ticks( ) + _G.Seed ) % ( (Theme.Settings.Fps * Theme.Settings.TransitionSpeed) * (Theme.Settings.TransitionSpeed) ) / ( (Theme.Settings.Fps * Theme.Settings.TransitionSpeed) * (Theme.Settings.TransitionSpeed) );
        local R, G, B = Theme:GetNextColor( Hue );

        Theme.Settings.Color.R = R;
        Theme.Settings.Color.G = G;
        Theme.Settings.Color.B = B;

        Theme:SetColor( Theme.Settings.Color );
    end;
end;

-- OnInit

function OnInit( )
    menu.restore_styles( );

    _G.Seed = math.random( ) * 10;

    if not Theme.Settings.Rainbow then
        Theme:SetColor( Theme.Settings.Color );
    end;
end;