using System;

namespace jive
{
  public static class Clock
  {
    private static Func<DateTime> time_provider;

    static Clock()
    {
      reset();
    }

    public static Date today()
    {
      return time_provider();
    }

    public static DateTime now()
    {
      return time_provider();
    }

#if DEBUG
    public static void change_time_provider_to(Func<DateTime> new_time_provider)
    {
      if (new_time_provider != null) time_provider = new_time_provider;
    }
#endif

    public static void reset()
    {
      time_provider = () => DateTime.Now;
    }
  }
}