using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using tool.ViewModels;

namespace tool.Actions
{
    public class SyncEditAction : IUndoItem
    {
        public SyncEditAction(IUndoContext _context)
        {
            Context = _context;
            m_OldDataStream = new MemoryStream();
            m_OldDataWriter = new StreamWriter(m_OldDataStream);
            m_OldDataReader = new StreamReader(m_OldDataStream);
            ((SyncViewModel)Context).Save(m_OldDataWriter);
        }

        public bool CanRedo {  get { return true; } }

        public bool CanUndo { get { return true; } }

        public IUndoContext Context
        {
            get;
            private set;
        }

        public string Description { get { return "Edit cell value"; } }

        public void Redo()
        {
            if (m_NewDataStream == null)
            {
                m_NewDataStream = new MemoryStream();
                m_NewDataWriter = new StreamWriter(m_OldDataStream);
                m_NewDataReader = new StreamReader(m_OldDataStream);
                ((SyncViewModel)Context).Save(m_NewDataWriter);
            }
            else
            {
                ((SyncViewModel)Context).Load(m_NewDataReader);
            }
        }

        public void Undo()
        {
            ((SyncViewModel)Context).Load(m_OldDataReader);
        }

        private MemoryStream m_OldDataStream;
        private MemoryStream m_NewDataStream;
        private StreamWriter m_OldDataWriter;
        private StreamWriter m_NewDataWriter;
        private StreamReader m_OldDataReader;
        private StreamReader m_NewDataReader;
    }
}