using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Threading.Tasks;

namespace Calender
{
    public class AccountDatabase
    {
        private List<String> account = new List<String>();
        private FileStream fs = new FileStream("c:/dev/cds.txt", FileMode.Open);

        public AccountDatabase()
        {

        }

        public void AddAccount()
        {
            bool keepGoing = true;

            while (keepGoing)
            {
                try
                {
                    //Reads the File Database//
                    IFormatter formatter = new BinaryFormatter();
                    Account d = (Account)formatter.Deserialize(fs);
                    String tre = d.ToString();
                    account.Add(tre);
                }
                catch (SerializationException e)
                {
                    keepGoing = false;
                }
            }
            //Request for Registry//
            bool isNotValid = true;
            Console.Write("Enter Username: ");
            String username = Console.ReadLine();
            //Checks for the Validity of the Username//
            while (isNotValid)
            {
                if (account.Contains(username))
                {
                    Console.WriteLine("Username Already Taken");
                }
                else
                {
                    isNotValid = false;
                }
            }
                Console.Write("Enter Password: ");
                String password = Console.ReadLine();
                Account newA = new Account(username, password);
                //Adds new Account to the Database
                MemoryStream stream = SerializeToStream(newA);
                byte[] Mem = stream.ToArray();
                fs.Seek(fs.Length, SeekOrigin.Begin);
                fs.Write(Mem, 0, Mem.Length);


        }


        public static MemoryStream SerializeToStream(Account o)
        {
            MemoryStream stream = new MemoryStream();
            IFormatter formatter = new BinaryFormatter();
            formatter.Serialize(stream, o);
            Console.WriteLine(stream);
            return stream;
        }
    }
}