using LMS.Common.Attributes;

namespace LMS.Common.Extensions
{
    public static class EnumExtensions
    {
        /// <summary>
        /// 判断是否为有效的权限类型
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static bool IsValidPermissionType(Type enumType, object value)
        {
            if (enumType == null || !enumType.IsEnum)
            {
                return false;
            }

            if (value == null)
            {
                return false;
            }

            // 处理整数类型
            if (value is int intValue)
            {
                return Enum.IsDefined(enumType, intValue);
            }

            // 处理字符串类型
            if (value is string stringValue)
            {
                return Enum.TryParse(enumType, stringValue, true, out _);
            }

            // 如果不是整数或字符串，尝试转换为枚举底层类型
            try
            {
                var underlyingType = Enum.GetUnderlyingType(enumType);
                var convertedValue = Convert.ChangeType(value, underlyingType);
                return Enum.IsDefined(enumType, convertedValue);
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 获取对应的枚举的描述
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string GetDescription(this Enum value)
        {
            var field = value.GetType().GetField(value.ToString());
            var attribute = Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute)) as DescriptionAttribute;
            return attribute == null ? value.ToString() : attribute.Description;
        }

        /// <summary>
        /// 获取对应的枚举的结果
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string GetResult(this Enum value)
        {
            var field = value.GetType().GetField(value.ToString());
            var attribute = Attribute.GetCustomAttribute(field, typeof(ResultAttribute)) as ResultAttribute;
            return attribute == null ? value.ToString() : attribute.Result;
        }
    }
}