using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Input;
using System.Windows.Shapes;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Modes;
using Org.BouncyCastle.Crypto.Paddings;
using Org.BouncyCastle.Crypto.Parameters;
using Path = System.IO.Path;

namespace ArchivesCenter3
{
    /// <summary>
    /// Login.xaml 的交互逻辑
    /// </summary>
    public partial class Login : Window
    {
        public Login()
        {
            InitializeComponent();
            if (Settings1.Default.IsOOBEPassed)
                LoginButton.IsEnabled = true;
            else
            {
                reg reg = new reg();
                reg.ShowDialog();
                LoginButton.IsEnabled = true;
            }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            string documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            string targetFolderPath = Path.Combine(documentsPath, "ArchivesCenter");
            if (LoginKeyBox.Text == Settings1.Default.Password)
            {
                DecryptFolder(targetFolderPath);
                MainWindow mainWindow = new MainWindow();
                mainWindow.Show();
                this.Close();
            }
        }

        private static byte[] key = Encoding.UTF8.GetBytes("8f4a3b5c6d7e9f1a2b3c4d5e6f7a8b9c");

        // 定义一个固定的初始化向量（IV），长度为 16 字节
        private static readonly byte[] iv = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F };

        public static void DecryptFolder(string folderPath)
        {
            foreach (string filePath in Directory.GetFiles(folderPath, "*.*", SearchOption.AllDirectories))
            {
                byte[] encryptedContent = File.ReadAllBytes(filePath);
                byte[] decryptedContent = Decrypt(encryptedContent);
                File.WriteAllBytes(filePath, decryptedContent);
                Console.WriteLine($"Decrypted: {filePath}");
            }
        }

        private static byte[] Decrypt(byte[] ciphertext)
        {
            var cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(new AesEngine()), new Pkcs7Padding());
            var keyParam = new KeyParameter(key);
            var parameters = new ParametersWithIV(keyParam, iv);
            cipher.Init(false, parameters);

            byte[] output = new byte[cipher.GetOutputSize(ciphertext.Length)];
            int length = cipher.ProcessBytes(ciphertext, 0, ciphertext.Length, output, 0);
            cipher.DoFinal(output, length);
            return output;
        }
    }
}