using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using Päevaküsimus.Models;

namespace Päevaküsimus
{
    public class SerializationService
    {
        static private string _fileName = "data.bin";

        public static void Serialize(object o)
        {
            using (Stream stream = new FileStream(_fileName, FileMode.Create, FileAccess.Write, FileShare.Write))
            {
                BinaryFormatter binaryFormatter = new BinaryFormatter();
                binaryFormatter.Serialize(stream, o);
            }
        }

        public static ObservableCollection<Question> DeSerialize ()
        {
            try
            { 
                using (Stream stream = new FileStream(_fileName, FileMode.OpenOrCreate, FileAccess.Read, FileShare.Read))
                {
                    BinaryFormatter binaryFormatter = new BinaryFormatter();
                    ObservableCollection<Question> questions = binaryFormatter.Deserialize(stream) as ObservableCollection<Question>;
                    return questions;
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine("Error: " + ex.Message);
                return null;
            }
        }
    }
}