using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Store.Client.Helpers
{
    public class DataOpenSSL
    {
        public static byte[] key = new byte[32] { 145, 232, 156, 201, 201, 0, 42, 184, 222, 111, 109, 49, 226, 169, 9, 44, 151, 148, 143, 120, 62, 84, 30, 170, 127, 242, 20, 141, 231, 33, 230, 6 };
        public static byte[] iv = new byte[16] { 113, 6, 75, 177, 160, 112, 73, 39, 178, 147, 82, 107, 186, 58, 144, 187 };

        public static string EncryptString(string plainText)
        {
            try
            {

                // Instantiate a new Aes object to perform string symmetric encryption
                Aes encryptor = Aes.Create();

                encryptor.Mode = CipherMode.CBC;

                // Set key and IV
                byte[] aesKey = new byte[32];
                Array.Copy(key, 0, aesKey, 0, 32);
                encryptor.Key = aesKey;
                encryptor.IV = iv;

                // Instantiate a new MemoryStream object to contain the encrypted bytes
                MemoryStream memoryStream = new MemoryStream();

                // Instantiate a new encryptor from our Aes object
                ICryptoTransform aesEncryptor = encryptor.CreateEncryptor();

                // Instantiate a new CryptoStream object to process the data and write it to the 
                // memory stream
                CryptoStream cryptoStream = new CryptoStream(memoryStream, aesEncryptor, CryptoStreamMode.Write);

                // Convert the plainText string into a byte array
                byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);

                // Encrypt the input plaintext string
                cryptoStream.Write(plainBytes, 0, plainBytes.Length);

                // Complete the encryption process
                cryptoStream.FlushFinalBlock();

                // Convert the encrypted data from a MemoryStream to a byte array
                byte[] cipherBytes = memoryStream.ToArray();

                // Close both the MemoryStream and the CryptoStream
                memoryStream.Close();
                cryptoStream.Close();

                // Convert the encrypted byte array to a base64 encoded string
                string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length);


                cipherText = cipherText.Replace("+", "-").Replace("/", "_").Replace("=", "");

                // Return the encrypted data as a string
                return cipherText;

            }
            catch (Exception)
            {

                //throw;
            }
            return plainText;
        }

        public static string DecryptString(string cipherText)
        {
            cipherText = cipherText.Replace("-", "+").Replace("_", "/");
            var x1 = cipherText.Length % 4;
            if (x1 > 0)
            {
                cipherText = cipherText + "====".Substring(x1);
            }
            // Instantiate a new Aes object to perform string symmetric encryption
            Aes encryptor = Aes.Create();

            encryptor.Mode = CipherMode.CBC;

            // Set key and IV
            byte[] aesKey = new byte[32];
            Array.Copy(key, 0, aesKey, 0, 32);
            encryptor.Key = aesKey;
            encryptor.IV = iv;

            // Instantiate a new MemoryStream object to contain the encrypted bytes
            MemoryStream memoryStream = new MemoryStream();

            // Instantiate a new encryptor from our Aes object
            ICryptoTransform aesDecryptor = encryptor.CreateDecryptor();

            // Instantiate a new CryptoStream object to process the data and write it to the 
            // memory stream
            CryptoStream cryptoStream = new CryptoStream(memoryStream, aesDecryptor, CryptoStreamMode.Write);

            // Will contain decrypted plaintext
            string plainText = String.Empty;

            try
            {
                // Convert the ciphertext string into a byte array
                byte[] cipherBytes = Convert.FromBase64String(cipherText);

                // Decrypt the input ciphertext string
                cryptoStream.Write(cipherBytes, 0, cipherBytes.Length);

                // Complete the decryption process
                cryptoStream.FlushFinalBlock();

                // Convert the decrypted data from a MemoryStream to a byte array
                byte[] plainBytes = memoryStream.ToArray();

                // Convert the decrypted byte array to string
                plainText = Encoding.UTF8.GetString(plainBytes, 0, plainBytes.Length);
            }
            catch (Exception)
            {

                //throw;
            }
            finally
            {
                // Close both the MemoryStream and the CryptoStream
                memoryStream.Close();
                cryptoStream.Close();
            }

            // Return the decrypted data as a string
            return plainText;
        }



    }
}