using System;
using AltNetHispano.Agendas.Domain.Exceptions;

namespace AltNetHispano.Agendas.Domain
{
  public class EventoNullState : EventoState
  {
    private EventoNullState()
    {
    }

    private static readonly EventoState _instance = new EventoNullState();
    public static EventoState GetInstance()
    {
      return _instance;
    }

    private const string Descripcion = "NullState";

    public override void Promover(Evento evento, Accion accion)
    {
      switch (accion)
      {
        case Accion.Proponer:
          evento.SetEstado(EventoPropuestoState.GetInstance());
          evento.AddTrack(new Track(evento, Accion.Proponer));
          break;
        case Accion.Agendar:
          evento.SetEstado(EventoAgendadoState.GetInstance());
          evento.AddTrack(new Track(evento, Accion.Agendar));
          break;
        default:
          throw new AccionNoSoportadaException(this.GetType(), accion);
      }
    }

    public override string GetDescripcion()
    {
      return Descripcion;
    }

  	public override bool PuedePromover(Accion accion)
  	{
  		return accion == Accion.Proponer || accion == Accion.Agendar;
  	}
  }
}