using System;
using System.IO;

namespace Swan {
  /// <summary>
  /// Provides utility methods to retrieve information about the current application.
  /// </summary>
  public static class SwanRuntime {
    // [Obsolete("NEED", false)]
    private static OperatingSystem? _oS;

    #region Properties
    /// <summary>
    /// Gets the current Operating System.
    /// </summary>
    /// <value>
    /// The os.
    /// </value>
    // [Obsolete("NEED", false)]
    public static OperatingSystem OS {
      get {
        if(_oS.HasValue == false) {
          String windowsDirectory = Environment.GetEnvironmentVariable("windir");
          _oS = String.IsNullOrEmpty(windowsDirectory) == false && windowsDirectory.Contains(@"\") && Directory.Exists(windowsDirectory)
            ? (OperatingSystem?)OperatingSystem.Windows
            : (OperatingSystem?)(File.Exists(@"/proc/sys/kernel/ostype") ? OperatingSystem.Unix : OperatingSystem.Osx);
        }

        return _oS ?? OperatingSystem.Unknown;
      }
    }

    #endregion
  }
}