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

namespace CCompressorXN_HelperLib
{
    /// <summary>
    /// 枚举操作类
    /// </summary>
    public class EnumHelper
    {
        /// <summary>
        /// 根据值获取枚举方法
        /// </summary>
        /// <param name="enumType">typeof(枚举)</param>
        /// <param name="value"></param>
        /// <returns></returns>
        public static Enum GetEnumByValue(Type enumType, int value)
        {
            return Enum.Parse(enumType, Enum.GetName(enumType, value)) as Enum;
        }

        /// <summary>
        /// 获取枚举的Description
        /// </summary>
        /// <param name="enumValue"></param>
        /// <returns></returns>
        public static string GetEnumDescription(Enum enumValue)
        {
            string value = enumValue.ToString();
            FieldInfo field = enumValue.GetType().GetField(value);
            object[] objs = field.GetCustomAttributes(typeof(DescriptionAttribute), false);  //获取描述属性
            if (objs == null || objs.Length == 0)  //当描述属性没有时，直接返回名称
                return value;
            DescriptionAttribute descriptionAttribute = (DescriptionAttribute)objs[0];
            return descriptionAttribute.Description;
        }

        /// <summary>
        /// 字符串转Enum
        /// </summary>
        /// <typeparam name="T">枚举</typeparam>
        /// <param name="str">字符串</param>
        /// <returns>转换的枚举</returns>
        public static T ToEnum<T>(string str)
        {
            return (T)Enum.Parse(typeof(T), str);
        }

        /// <summary>
        /// 枚举转集合
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        public static List<EnumItem> GetEnumItems<T>()
        {
            var result = new List<EnumItem>();

            Type enumType = typeof(T);

            if (!enumType.IsEnum)
            {
                return result;
            }

            string[] fieldstrs = Enum.GetNames(enumType);

            foreach (var item in fieldstrs)
            {
                var field = enumType.GetField(item);
                object[] arr = field.GetCustomAttributes(typeof(DescriptionAttribute), true); //获取属性字段数组
                string description;
                if (arr != null && arr.Length > 0)
                {
                    description = ((DescriptionAttribute)arr[0]).Description;   //属性描述
                }
                else
                {
                    description = item;  //描述不存在取字段名称
                }
                result.Add(new EnumItem
                {
                    Code = item,
                    Value = (int)Enum.Parse(enumType, item),
                    Descprtion = description,

                });
            }
            return result;
        }

        /// <summary>
        /// 根据字符串获取枚举值
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="name"></param>
        /// <returns></returns>
        public static int ConvertEnumToInt<T>(string name)
        {
            try
            {
                return (int)Enum.Parse(typeof(T), name);
            }
            catch (Exception)
            {

                throw;
            }
        }

    }

    public class EnumItem
    {
        /// <summary>
        /// 枚举值
        /// </summary>
        public string Code { get; set; }

        public int Value { get; set; }

        /// <summary>
        /// 描述
        /// </summary>
        public string Descprtion { get; set; }
    }
}