// A full-viewport overlay shown while app_exit_shutdown_start is running shutdown in the
// background (exit_shutdown.jai), so the window stays live and visibly busy instead of looking
// hung while the app finishes saving, with what it is waiting on.

app_exit_shutdown_overlay_ui :: () { using ImGui;
  if !app_exit_shutdown_started()  return;

  text, elapsed, detail := app_exit_shutdown_status();
  seconds := FormatFloat.{value = elapsed, trailing_width = 1, zero_removal = .NO};
  label := tprint("%1 (%2 s)", text, seconds);
  if detail  label = tprint("%\n%", label, detail);   // what it is waiting on

  viewport  := GetMainViewport();
  draw_list := GetForegroundDrawList(viewport);

  draw_list.AddRectFilled(draw_list, viewport.Pos, viewport.Pos + viewport.Size, GetColorU32(.{0, 0, 0, 0.55}));

  padding   := Vector2.{imgui_scale(18.0), imgui_scale(12.0)};
  text_size := imgui_text_size(label);
  box_size  := text_size + 2 * padding;
  box_min   := Vector2.{
    viewport.Pos.x + (viewport.Size.x - box_size.x) * 0.5,
    viewport.Pos.y + (viewport.Size.y - box_size.y) * 0.5,
  };
  box_max := box_min + box_size;

  background := GetStyleColorVec4(.PopupBg).*;
  border     := app_theme.palette.accent;
  text_color := GetStyleColorVec4(.Text).*;
  rounding   := GetStyle().WindowRounding;

  draw_list.AddRectFilled(draw_list, box_min, box_max, GetColorU32(background), rounding);
  draw_list.AddRect(draw_list, box_min, box_max, GetColorU32(border), rounding, imgui_scale(1.5));
  draw_list.AddText(draw_list, box_min + padding, GetColorU32(text_color), label);
}