# GLFW_TRANSPARENT_FRAMEBUFFER, seems to be unsupported by LibGLFW
GLFW_TRANSPARENT_FRAMEBUFFER = 0x0002000A
# GLFW_FOCUS_ON_SHOW, also unsupported by LibGLFW
GLFW_FOCUS_ON_SHOW = 0x0002000C

class Funfriend::WindowContext
  getter window : CrystGLFW::Window
  property closed : Bool = false

  DEFAULT_HINTS = {
    # supposedly required on MacOS
    Window::HintLabel::ContextVersionMajor => 3,
    Window::HintLabel::ContextVersionMinor => 3,
    Window::HintLabel::OpenGLForwardCompat => true,
    Window::HintLabel::OpenGLProfile       => OpenGLProfile::Core,
    Window::HintLabel::ClientAPI           => ClientAPI::OpenGL,

    Window::HintLabel::Resizable           => false,
    Window::HintLabel::Decorated           => false,
    Window::HintLabel::Floating            => true,
    Window::HintLabel::Focused             => false,
  }

  def initialize(title : String, width : Int32, height : Int32, transparent : Bool, hints = DEFAULT_HINTS)
    if transparent
      LibGLFW.window_hint(GLFW_TRANSPARENT_FRAMEBUFFER, 1)
    end
    LibGLFW.window_hint(GLFW_FOCUS_ON_SHOW, 0)

    @window = Window.new title: title, width: width, height: height, hints: hints

    LOG.info { "creating context #{self}" }
  end

  def update(dt : Float64)
    # let OpenGL draw to it
    window.make_context_current

    # nothing to draw; dummy out

    # idk why you need to do this but oh well
    window.swap_buffers
  end

  def close
    window.destroy
    @closed = true
  end

  def clean_up
  end

  def destroy
    close
    clean_up
  end
end