using OASystem.Domain.Attributes;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace OASystem.Domain.AesEncryption
{
    /// <summary>
    /// AES 加密/解密
    /// </summary>
    public static class EncryptionProcessor
    {
       
        /// <summary>
        /// aes 加密
        /// </summary>
        /// <param name="obj"></param>
        public static void EncryptProperties(object obj)
        {
            if (obj == null) return;

            var properties = obj.GetType()
                .GetProperties(BindingFlags.Public | BindingFlags.Instance)
                .Where(p => p.IsDefined(typeof(EncryptedAttribute), false) && p.CanWrite && p.CanRead);

            foreach (var property in properties)
            {
                var value = property.GetValue(obj) as string;
                if (!string.IsNullOrEmpty(value))
                {
                    var encryptedValue = AesEncryptionHelper.Encrypt(value);
                    property.SetValue(obj, encryptedValue);
                }
            }
        }

        /// <summary>
        /// aes 解密
        /// </summary>
        /// <param name="obj"></param>
        public static void DecryptProperties(object obj)
        {
            if (obj == null) return;

            var properties = obj.GetType()
                .GetProperties(BindingFlags.Public | BindingFlags.Instance)
                .Where(p => p.IsDefined(typeof(EncryptedAttribute), false) && p.CanWrite && p.CanRead);

            foreach (var property in properties)
            {
                var value = property.GetValue(obj) as string;
                if (!string.IsNullOrEmpty(value))
                {
                    var decryptedValue = AesEncryptionHelper.Decrypt(value);
                    property.SetValue(obj, decryptedValue);
                }
            }
        }

        /// <summary>
        /// 验证字符串是否是有效的加密格式
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static bool IsEncrypted(string value)
        {
            try
            {
                // 尝试从 Base64 解码
                var bytes = Convert.FromBase64String(value);

                // AES 加密后的数据通常会是 16 字节的倍数
                return bytes.Length % 16 == 0;
            }
            catch
            {
                return false; // 如果 Base64 解码失败，说明字段未加密
            }
        }
    }
}