using System.Collections.Concurrent;
using System.ComponentModel;
using System.Reflection;
using JNPF.Common.Extension;

namespace Tnb.WarehouseMgr.Entities.Consts
{

    public class GenericEnumDicionary<T> where T : Enum
    {
        private static string tn = typeof(T).Name;
        private static ConcurrentDictionary<string, Dictionary<int, string>> enumDescMap = new();
        private static ConcurrentDictionary<string, FieldInfo[]?> enumMemberMap = new();

        static GenericEnumDicionary()
        {
            enumMemberMap.GetOrAdd(tn, f => typeof(T).GetFields(BindingFlags.Public | BindingFlags.Static));
            if (enumMemberMap[tn]?.All(f => f.GetCustomAttribute<DescriptionAttribute>() != null) ?? false)
            {
                enumDescMap.GetOrAdd(tn, dic => typeof(T).GetEnumDescDictionary());
            }
        }
        public static string GetEnumDesc(int enumVal)
        {
            return enumDescMap.ContainsKey(tn) ? enumDescMap[tn]?[enumVal] ?? string.Empty : string.Empty;
        }
    }
}