using System;
using System.ComponentModel;
using System.Reflection;

namespace DS.WMS.PrintApi.Utils
{
    /// <summary>
    /// 枚举工具类
    /// </summary>
    public static class EnumUtil
    {
        /// <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>(this string str)
        {
            try
            {
                return (T)Enum.Parse(typeof(T), str);
            }
            catch
            {
                return default(T);
            }
        }

        /// <summary>
        /// 获取到对应枚举的描述-没有描述信息，返回枚举值
        /// </summary>
        /// <param name="enum"></param>
        /// <returns></returns>
        public static string EnumDescription(this Enum @enum)
        {
            Type type = @enum.GetType();
            string name = Enum.GetName(type, @enum);
            if (name == null)
            {
                return null;
            }
            FieldInfo field = type.GetField(name);
            if (!(Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute)) is DescriptionAttribute attribute))
            {
                return name;
            }
            return attribute?.Description;
        }

        public static int ToEnumInt(this Enum e)
        {
            try
            {
                return e.GetHashCode();
            }
            catch (Exception)
            {
                return 0;
            }
        } 
    }
}