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

namespace WMS.Util
{
    public static class FuncEnum
    {
        /// <summary>
        /// 获取枚举名称、值集合
        /// </summary>
        /// <param name="enunType"></param>
        /// <returns></returns>
        public static Dictionary<int, string> ToDicByValue(this Type enunType)
        {
            Dictionary<int, string> dicEnums = new Dictionary<int, string>();
            var strList = Enum.GetNames(enunType).ToList();
            foreach (string key in strList)
            {
                string val = Enum.Format(enunType, Enum.Parse(enunType, key), "d");
                dicEnums.Add(int.Parse(val), key);
            }
            return dicEnums;
        }
        /// <summary>
        /// 获取枚举名称、描述集合
        /// </summary>
        /// <param name="enunType"></param>
        /// <returns></returns>
        public static Dictionary<string, string> ToDicByDescription(this Type enunType)
        {
            Dictionary<string, string> dicEnums = new Dictionary<string, string>();

            foreach (FieldInfo field in enunType.GetFields(BindingFlags.Static | BindingFlags.Public))
            {
                object[] attrs = field.GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), false);
                if (attrs != null && attrs.Length > 0)
                {
                    dicEnums.Add(field.Name, ((DescriptionAttribute)attrs[0]).Description);
                }
            }
            return dicEnums;
        }
        /// <summary>
        /// 获取枚举名称、描述集合
        /// </summary>
        /// <param name="enunType"></param>
        /// <returns></returns>
        public static string ToDicByDescription(this Type enunType,string enumValue)
        {
            Dictionary<string, string> dicEnums = new Dictionary<string, string>();
            var descValue = "";
            foreach (FieldInfo field in enunType.GetFields(BindingFlags.Static | BindingFlags.Public))
            {
                object[] attrs = field.GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), false);
                if (attrs != null && attrs.Length > 0)
                {
                    if (field.Name == enumValue)
                    {
                        descValue = ((DescriptionAttribute) attrs[0]).Description;
                        break;
                    } 
                }
            }
            return descValue;
        }
        /// <summary>
        /// 获取枚举描述
        /// </summary>
        /// <param name="enumValue"></param>
        /// <returns></returns>
        public static string ToStringByDesc(this Enum enumValue)
        {
            string value = enumValue.ToString();
            FieldInfo field = enumValue.GetType().GetField(value);
            object[] objs = field.GetCustomAttributes(typeof(DescriptionAttribute), false);     
            if (objs.Length == 0)
                return value;
            DescriptionAttribute descriptionAttribute = (DescriptionAttribute)objs[0];
            return descriptionAttribute.Description;
        }
        /// <summary>
        /// 获取枚举名称、值、描述集合
        /// </summary>
        /// <param name="enunType"></param>
        /// <returns></returns>
        public static List<Tuple<string,string,string>> EnumToTuple(this Type enunType)
        {
            List<Tuple<string, string, string>> tuples = new List<Tuple<string, string, string>>();
            foreach (FieldInfo field in enunType.GetFields(BindingFlags.Static | BindingFlags.Public))
            {
                object[] attrs = field.GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), false);
                string description = string.Empty;
                if (attrs != null && attrs.Length > 0)
                    description=((DescriptionAttribute)attrs[0]).Description;
                string val = Enum.Format(enunType, Enum.Parse(enunType, field.Name), "d");
                tuples.Add(new Tuple<string, string, string>(field.Name,val, description));
            }
            return tuples;
        }
    }
}