using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection;

namespace Kreta.Ellenorzo.WebApi.VN.Logic
{
    /// <summary>
    /// Author: Kovács Kornél (DevKornél) Created On: 2019.06.
    /// </summary>
    internal static class EnumLogic
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
        public static IEnumerable<(int Id, string Nev, string Leiras)> GetEnumWithDisplayNameAttribute(Type enumType)
        {
            foreach (object item in Enum.GetValues(enumType))
            {
                (int Id, string Nev, string Leiras) returnObject = ((int)item, item.ToString(), null);
                FieldInfo fieldInfo = item.GetType().GetField(returnObject.Nev);

                if (fieldInfo != null)
                {
                    DisplayAttribute attributes = (DisplayAttribute)fieldInfo.GetCustomAttributes(typeof(DisplayAttribute), false).FirstOrDefault();

                    if (attributes != null)
                    {
                        returnObject.Leiras = attributes.GetName();
                    }
                }

                yield return returnObject;
            }
        }

        public static string GetDisplayNameAttribute<T>(T enumValue)
        {
            string nev = enumValue.ToString();
            if (string.IsNullOrWhiteSpace(nev))
            {
                return null;
            }

            FieldInfo fieldInfo = typeof(T).GetField(nev);

            if (fieldInfo != null)
            {
                DisplayAttribute attributes = (DisplayAttribute)fieldInfo.GetCustomAttributes(typeof(DisplayAttribute), false).FirstOrDefault();

                if (attributes != null)
                {
                    return attributes.GetName();
                }
            }

            return null;
        }
    }
}