using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security.Cryptography;

namespace BetterExplorer.Networks {

	/// <summary>
	/// This class manages all account-related information for Better Explorer.
	/// </summary>
	/// <remarks>
	/// this class will be used to manage the account information file, including anything security-related, 
	/// and will be a point of communication between the main UI and this information
	/// </remarks>
	[Obsolete("Never Actually Used. We should remove this!!!")]
	public class NetworkAccountManager : List<NetworkItem> {

		// Call this function to remove the key from memory after use for security.
		[System.Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
		private static extern bool ZeroMemory(ref string Destination, int Length);


		// TO_DO: Add code for storing and retrieving from file
		// TO_DO: Decide upon an encryption service (DES, Rjindael, etc.) and add code for
		//       "decrypt file to memory" and "encrypt memory to file".

		/*
		 * Account File Structure:
		 * 
		 * "
		 * ;account:key:secret:username:password;account:username:password;account:address:username:password;
		 * "
		 * 
		*/

		//private string _PassFile;
		//private string _DataFile;
		//private bool _MasterUsed;
		//private SecureString _MasterPW;
		private string _dataloc = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "\\BExplorer\\NetworkAccounts\\";

		public string DataLocation {
			get {
				return _dataloc;
			}
			set {
				_dataloc = value;
			}
		}



		// Function to Generate a 64 bits Key.
		static string GenerateKey() {
			// Create an instance of Symetric Algorithm. Key and IV is generated automatically.
			DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();

			// Use the Automatically generated key for Encryption. 
			return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
		}

		static void EncryptFile(string sInputFilename, string sOutputFilename, string sKey) {
			FileStream fsInput = new FileStream(sInputFilename,
				FileMode.Open,
				FileAccess.Read);

			FileStream fsEncrypted = new FileStream(sOutputFilename,
							FileMode.Create,
							FileAccess.Write);

			DESCryptoServiceProvider DES = new DESCryptoServiceProvider();

			DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
			DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

			ICryptoTransform desencrypt = DES.CreateEncryptor();
			CryptoStream cryptostream = new CryptoStream(fsEncrypted,
			   desencrypt,
			   CryptoStreamMode.Write);

			byte[] bytearrayinput = new byte[fsInput.Length];
			fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
			cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
			cryptostream.Close();
			fsInput.Close();
			fsEncrypted.Close();
		}

		static void DecryptFile(string sInputFilename, string sOutputFilename, string sKey) {
			DESCryptoServiceProvider DES = new DESCryptoServiceProvider();

			//A 64 bit key and IV is required for this provider.
			//Set secret key For DES algorithm.
			DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
			//Set initialization vector.
			DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

			//Create a file stream to read the encrypted file back.
			FileStream fsread = new FileStream(sInputFilename,
			   FileMode.Open,
			   FileAccess.Read);

			//Create a DES decryptor from the DES instance.
			ICryptoTransform desdecrypt = DES.CreateDecryptor();
			//Create crypto stream set to read and do a 
			//DES decryption transform on incoming bytes.
			CryptoStream cryptostreamDecr = new CryptoStream(fsread,
			   desdecrypt,
			   CryptoStreamMode.Read);
			//Print the contents of the decrypted file.
			StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
			fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
			fsDecrypted.Flush();
			fsDecrypted.Close();
		}

	}
}