using System;
using System.Collections;
using System.Linq;

namespace Neo.Afx.ComponentModel
{
    /// <summary>
    /// Contains Enum extensions methods
    /// </summary>
    public static partial class Extensions
    {
        #region GetValues

        /// <summary>
        /// Retrieves an array of the values of the constants in a specified enumeration.
        /// </summary>
        /// <param name="enumType">The type of the enum.</param>
        /// <returns>
        /// An array that contains the values of the constants in enum type
        /// </returns>
        public static IEnumerable GetValues(this Enum enumType)
        {
            return enumType.GetType().GetValues();
        }

        /// <summary>
        /// Retrieves an array of the values of the constants in a specified enumeration.
        /// </summary>
        /// <param name="enumType">The type of the enum.</param>
        /// <returns>
        /// An array that contains the values of the constants in enum type
        /// </returns>
        public static IEnumerable GetValues(this Type enumType)
        {
            if(!enumType.IsEnum)
            {
                throw new ArgumentException("Type '" + enumType.Name + "' is not an enum");
            }

            var fields = from field in enumType.GetFields()
                         where field.IsLiteral
                         select field.GetValue(enumType);

            return fields.ToList();
        }

        #endregion
    }
}