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

namespace DS.Module.Core;

/// <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;
        }
    }
}