using System.IO;
using System.Security.Cryptography;
using System.Windows;

namespace Sai.Toolkit.Core.Helpers;

public static class FileEncryptHelper
{
	public static void DecryptFile(string strPath)
	{
		try
		{
			var intLent = strPath.LastIndexOf("\\", StringComparison.Ordinal) + 1; //设置截取的起始位置
			var intLong = strPath.Length; //设置截取的长度
			var strName = strPath.Substring(intLent, intLong - intLent); //要加密的文件名称
			var intTxt = strName.LastIndexOf(".", StringComparison.Ordinal); //设置截取的起始位置
			strName = strName.Substring(0, intTxt); //获取文件拓展名
			if (strName.LastIndexOf("Out", StringComparison.Ordinal) != -1)
			{
				strName = strName.Substring(0, strName.LastIndexOf("Out", StringComparison.Ordinal));
			}
			else
			{
				strName += "In";
			}

			var strInName = strPath.Substring(0, strPath.LastIndexOf("\\", StringComparison.Ordinal) + 1) + strName + ".txt"; //解密后的文件名及路径
			//解密文件密钥
			byte[] key =
			{
				24,
				55,
				102,
				24,
				98,
				26,
				67,
				29,
				84,
				19,
				37,
				118,
				104,
				85,
				121,
				27,
				93,
				86,
				24,
				55,
				102,
				24,
				98,
				26,
				67,
				29,
				9,
				2,
				49,
				69,
				73,
				92
			};
			byte[] iv = { 22, 56, 82, 77, 84, 31, 74, 24, 55, 102, 24, 98, 26, 67, 29, 99 };
#if NET8_0
            var myRijndael = Aes.Create(); //创建RijndaelManaged对象
#else
            var myRijndael = new RijndaelManaged();
#endif
            //创建RijndaelManaged对象
            var fsOut = File.Open(strPath, FileMode.Open, FileAccess.Read); //创建FileStream对象
			var csDecrypt = new CryptoStream(fsOut, myRijndael.CreateDecryptor(key, iv), CryptoStreamMode.Read);
			var sr = new StreamReader(csDecrypt); //把文件读出来
			var sw = new StreamWriter(strInName); //解密后写一个新文件
			sw.Write(sr.ReadToEnd());
			sw.Flush();
			sw.Close(); //关闭FileStream对象
			fsOut.Close(); //关闭FileStream对象
			if (MessageBox.Show("解密成功！解密后的文件名及路径为：\n" + strInName + ",是否删除文件", "提示信息", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
			{
				File.Delete(strPath); //清除指定文件
				//tbpathname.Text = "";//请空文本文件
			}
		}
		catch (Exception ex)
		{
			MessageBox.Show(ex.Message);
		}
	}

	public static void EncryptFile(string strPath)
	{
		try
		{
			var intLent = strPath.LastIndexOf("\\", StringComparison.Ordinal) + 1; //设置截取的起始位置
			var intLong = strPath.Length; //设置截取的长度
			var strName = strPath.Substring(intLent, intLong - intLent); //要加密的文件名称
			var intTxt = strName.LastIndexOf(".", StringComparison.Ordinal); //设置截取的起始位置
			var intTxtLeng = strName.Length; //设置截取的长度
			var strTxt = strName.Substring(intTxt, intTxtLeng - intTxt); //取出文件的拓展名
			strName = strName.Substring(0, intTxt);
			var strOutName = strPath.Substring(0, strPath.LastIndexOf("\\", StringComparison.Ordinal) + 1) + strName + "Out" + strTxt; //加密后的文件名及路径
			byte[] key =
			{
				24,
				55,
				102,
				24,
				98,
				26,
				67,
				29,
				84,
				19,
				37,
				118,
				104,
				85,
				121,
				27,
				93,
				86,
				24,
				55,
				102,
				24,
				98,
				26,
				67,
				29,
				9,
				2,
				49,
				69,
				73,
				92
			}; //加密文件密钥
			byte[] iv = { 22, 56, 82, 77, 84, 31, 74, 24, 55, 102, 24, 98, 26, 67, 29, 99 };
#if NET8_0
            var myRijndael = Aes.Create();
#else
            var myRijndael = new RijndaelManaged();
#endif
            var fsOut = File.Open(strOutName, FileMode.Create, FileAccess.Write);
			var fsIn = File.Open(strPath, FileMode.Open, FileAccess.Read);
			var csDecrypt = new CryptoStream(fsOut, myRijndael.CreateDecryptor(key, iv), CryptoStreamMode.Write); //写入加密文本文件
			var br = new BinaryReader(fsIn); //创建阅读器来加密文件
			csDecrypt.Write(br.ReadBytes((int)fsIn.Length), 0, (int)fsIn.Length); //将数据写入加密文件
			csDecrypt.Close(); //关闭CryptoStream对象
			fsIn.Close(); //关闭FileStream对象
			fsOut.Close(); //关闭FileStream对象
			if (MessageBox.Show("加密成功！加密后的文件名及路径为：\n" + strOutName + ",是否删除文件", "提示信息", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
			{
				File.Delete(strPath); //清除指定文件
				//tbpathname.Text = "";//请空文本文件
			}
		}
		catch (Exception ex)
		{
			MessageBox.Show(ex.Message);
		}
	}
}