using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace Elight.Utility.Enum
{
    /// <summary>
    ///
    /// </summary>
    /// Author:mxg
    /// CreatedTimed:2022-05-13 06:00 PM
    public static class EnumExtension
    {
        public static string? ToDescription(this System.Enum item)
        {
            string? name = item.ToString();
            var desc = item.GetType().GetField(name)?.GetCustomAttribute<DescriptionAttribute>();
            return desc?.Description ?? name;
        }

        public static long ToInt64(this System.Enum item)
        {
            return Convert.ToInt64(item);
        }

        public static List<Dictionary<string, object>> ToList(this System.Enum value, bool ignoreNull = false)
        {
            var enumType = value.GetType();

            if (!enumType.IsEnum)
                return null;

            return System.Enum.GetValues(enumType).Cast<System.Enum>()
                .Where(m => !ignoreNull || !m.ToString().Equals("Null")).Select(x => new Dictionary<string, object?>
                {
                    ["Label"] = x.ToDescription(),
                    ["Value"] = x
                }).ToList();
        }

        public static List<Dictionary<string, object>> ToList<T>(bool ignoreNull = false)
        {
            var enumType = typeof(T);

            if (!enumType.IsEnum)
                return null;

            return System.Enum.GetValues(enumType).Cast<System.Enum>()
                 .Where(m => !ignoreNull || !m.ToString().Equals("Null")).Select(x => new Dictionary<string, object?>
                 {
                     ["Label"] = x.ToDescription(),
                     ["Value"] = x
                 }).ToList();
        }
    }
}