using System;

namespace SCMA
{

  public static class EnumerationExtensions
  {

    /// <summary>
    /// checks if the value contains the provided type
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="type"></param>
    /// <param name="value"></param>
    /// <returns></returns>
    public static bool Has<T>(this System.Enum type, T value)
    {
      try
      {
        return (((int)(object)type & (int)(object)value) == (int)(object)value);
      }
      catch
      {
        return false;
      }
    }

    /// <summary>
    /// checks if the value is only the provided type
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="type"></param>
    /// <param name="value"></param>
    /// <returns></returns>
    public static bool Is<T>(this System.Enum type, T value)
    {
      try
      {
        return (int)(object)type == (int)(object)value;
      }
      catch
      {
        return false;
      }
    }

    /// <summary>
    /// appends a value
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="type"></param>
    /// <param name="value"></param>
    /// <returns></returns>
    public static T Add<T>(this System.Enum type, T value)
    {
      try
      {
        return (T)(object)(((int)(object)type | (int)(object)value));
      }
      catch (Exception ex)
      {
        throw new ArgumentException(
            string.Format(
                "Could not append value from enumerated type '{0}'.",
                typeof(T).Name
                ), ex);
      }
    }

    /// <summary>
    /// completely removes the value
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="type"></param>
    /// <param name="value"></param>
    /// <returns></returns>
    public static T Remove<T>(this System.Enum type, T value)
    {
      try
      {
        return (T)(object)(((int)(object)type & ~(int)(object)value));
      }
      catch (Exception ex)
      {
        throw new ArgumentException(
            string.Format(
                "Could not remove value from enumerated type '{0}'.",
                typeof(T).Name
                ), ex);
      }
    }

  }
}