public void Report(TextWriter writer, Conductor conductor, Patron patron)
{
//TODO: also putting a cap on the minutes: 23:59? see example ...
var earliestDepartureTimeMinutes
= DepartureTimeMinutes
+ conductor.GetStopIntervalsMinutes(patron).Sum();
writer.WriteLine(earliestDepartureTimeMinutes.FormatMinutes());
}
/// <summary>
/// Returns whether the <paramref name="trip"/> CanBeScheduled for the
/// <paramref name="patron"/>, taking into consideration any <paramref name="deltas"/>
/// incurred by boarding mid-line.
/// </summary>
/// <param name="trip"></param>
/// <param name="patron"></param>
/// <param name="deltas"></param>
/// <returns></returns>
public static bool CanBeScheduled(this Trip trip, Patron patron, GetStopIntervalsMinutesDelegate deltas)
{
// Deal with these couple of obvious criteria first.
if (trip == null || trip.Direction != patron.Direction)
return false;
var totalDeltaMinutes = deltas(patron).Sum();
/* Now we can deal with the next obvious condition. Do not normalize the Patron time
* after all. Not only is this acceptable as-is, I truly don't believe there is a way
* for us to know otherwise; unless we wanted to incorporate actual DateTime dates
* into the mix. */
return trip.DepartureTimeMinutes + totalDeltaMinutes >= patron.DepartureTimeMinutes;
}
private void ScheduleTrip(Patron patron)
{
Trip last;
/* Backfill the schedule until the Patron's request can be fulfilled,
* if at all possible given known set of constraints. */
while ((last = _scheduledTrips
.Where(t => t.IsNorthbound == patron.IsNorthbound)
.OrderBy(t => t.DepartureTimeMinutes).LastOrDefault())
.CannotBeScheduled(patron, GetStopIntervalsMinutes))
{
TripConstraint constraint;
var nextDepartureTimeMinutes = GetNextDepartureTimeMinutes(last, patron, out constraint);
// It is not possible to fulfill the Patron's itinerary given the allowable constraints.
if (nextDepartureTimeMinutes == null) break;
var trip = new Trip(constraint, nextDepartureTimeMinutes.Value);
_scheduledTrips.Add(trip);
}
// Because Patron may have jumped into the queue midstream.
patron.Itinerary = _scheduledTrips.First(
t => t.CanBeScheduled(patron, GetStopIntervalsMinutes));
}
// ReSharper disable SuggestBaseTypeForParameter
/// <summary>
///
/// </summary>
/// <param name="trip"></param>
/// <param name="patron"></param>
/// <param name="constraint"></param>
/// <returns></returns>
/// <remarks>This was another impacted area where not only calculating the desired
/// departure time, but also knowing about the associated constraint, was desirable.</remarks>
private int? GetNextDepartureTimeMinutes(Trip trip, Patron patron, out TripConstraint constraint)
{
// Should work for both Northbound (true/false), inverse of which is Southbound.
constraint = Constraints.Single(t => t.IsNorthbound == patron.IsNorthbound);
if (trip == null)
return constraint.FirstDepartureTimeMinutes;
var dtm = trip.DepartureTimeMinutes;
// Which closing the loop the refactor should be relatively painless after all.
var result = dtm + constraint.Frequencies.GetWaitTimeMinutes(dtm);
return result > constraint.MaxAllowableDepartureTimeMinutes
? (int?) null
: result;
}
/// <summary>
/// Returns a collection of stop intervals relevant from the <paramref name="patron"/>
/// <see cref="Patron.StopNumber"/> in the appropriate <see cref="IDirectional.IsNorthbound"/>.
/// This is a useful callback throughout the approach.
/// </summary>
/// <param name="patron"></param>
/// <returns></returns>
internal IEnumerable<int> GetStopIntervalsMinutes(Patron patron)
{
// No need to subtract one here just pass the StopNumber through in either case.
return patron.IsNorthbound
? StopIntervalMinutes.Take(patron.StopNumber)
: StopIntervalMinutes.Skip(patron.StopNumber);
}
/// <summary>
/// Returns whether the <paramref name="trip"/> CannotBeScheduled for the
/// <paramref name="patron"/>, taking into consideration any <paramref name="deltas"/>
/// incurred by boarding mid-line.
/// </summary>
/// <param name="trip"></param>
/// <param name="patron"></param>
/// <param name="deltas"></param>
/// <returns></returns>
public static bool CannotBeScheduled(this Trip trip, Patron patron, GetStopIntervalsMinutesDelegate deltas)
{
return !trip.CanBeScheduled(patron, deltas);
}
public void Report(TextWriter writer, Conductor conductor, Patron patron)
{
var earliestDepartureTimeMinutes
= DepartureTimeMinutes
+ conductor.GetStopIntervalsMinutes(patron).Sum();
writer.WriteLine(earliestDepartureTimeMinutes.FormatMinutes());
}