package jalview.bin;

import java.awt.Toolkit;

public class HiDPISetting
{
  public static final int dpi;

  public static final int scale;

  private static final int hidpi = 110;

  private static final String scaleProperty = "sun.java2d.uiScale";

  private static final boolean isAMac = System.getProperty("os.name")
          .indexOf("Mac") > -1;

  private static final boolean isLinux = System.getProperty("os.name")
          .toLowerCase().indexOf("linux") > -1;

  private static final boolean isWindows = System.getProperty("os.name")
          .toLowerCase().indexOf("windows") > -1;

  static
  {
    dpi = Toolkit.getDefaultToolkit().getScreenResolution();
    scale = dpi / hidpi + 1;
    if (scale > 1 && isLinux)
    {
      System.out.println("DPI detected as " + dpi
              + ". Scaling factor set to " + scale + ".");
    }
  }

  public static String getScalePropertyArg()
  {
    // HiDPI setting. Just looking at Linux to start with. Test with Windows.
    if (!isLinux)
    {
      return null;
    }
    if (scale > 1)
    {
      return "-D" + scaleProperty + "=" + scale;
    }
    return null;
  }
}