using System.Text;
using System.Text.RegularExpressions;

namespace WX.Core.Utils.WinAPI
{
  public enum WindowsThemes
  {
    Classic,
    Aero,
    Luna,
    Zune,
    Royale
  }

  public static class ThemeInfo
  {
    public static WindowsThemes CurrentTheme
    {
      get
      {
        var themeFile = new StringBuilder(0x200);
        var res = Defs.GetCurrentThemeName(themeFile, 0x200, null, 0, null, 0);
        if (res!=0)
          return WindowsThemes.Classic;
        var fn = themeFile.ToString();
        var rx = new Regex(@"(?<=\\)([^\\]+)(?=\.msstyles)", RegexOptions.IgnoreCase);
        if (!rx.IsMatch(fn)) return WindowsThemes.Classic;
        switch (rx.Match(fn).Groups[0].Value.ToUpperInvariant())
        {
          case "AERO":
            return WindowsThemes.Aero;
          case "LUNA":
            return WindowsThemes.Luna;
          case "ZUNE":
            return WindowsThemes.Zune;
          case "ROYALE":
            return WindowsThemes.Royale;
          default:
            return WindowsThemes.Classic;
        }
      }
    }

    [DllImport("uxtheme.dll", CharSet = CharSet.Auto)]
    extern static Int32 GetCurrentThemeName(
      StringBuilder stringThemeName,
      int lengthThemeName,
      StringBuilder stringColorName,
      int lengthColorName,
      StringBuilder stringSizeName,
      int lengthSizeName
    );
  }
}