// Copyright (c) 2023- schick Informatik
// Description: Enum description string conversion helper

using System.ComponentModel;

namespace brecal.model
{
    public static class EnumHelper
    {
        public static string Description(this Enum eValue)
        {
            var nAttributes = eValue.GetType().GetField(eValue.ToString())?.GetCustomAttributes(typeof(DescriptionAttribute), false);
            if (nAttributes != null)
            {
                if (nAttributes.Any() && nAttributes.First() != null && (nAttributes.First() is DescriptionAttribute da))
                {                    
                    return da.Description;
                }                    
            }
            return eValue.ToString();
        }

        public static IEnumerable<KeyValuePair<string, string>> GetAllValuesAndDescription(Type t)
        {
            if (!t.IsEnum)
                throw new ArgumentException("t must be an enum");
            return from e in Enum.GetValues(t).Cast<Enum>()
                   select new KeyValuePair<string, string>(e.ToString(), e.Description());
        }

    }
}