/// <summary>
/// First unboard, then board passengers
/// </summary>
/// <param name="tram"></param>
/// <returns></returns>
public (int pOut, int pIn, List <int> entrances) UnboardAndBoard(Tram tram, int maxUnboard)
{
// First empty the tram
int pOut = tram.EmptyPassengers(maxUnboard);
// Then board the passengers
var(pIn, entrances) = BoardPassengers(tram);
return(pOut, pIn, entrances);
}
/// <summary>
/// Get platform corresponding to occupant
/// </summary>
/// <param name="tram">Tram</param>
/// <returns>Platform at which the tram is stationed</returns>
private Platform PlatformForOccupant(Tram tram)
{
if (tram == occupant)
{
return(Platform.A);
}
else if (tram == occupant2)
{
return(Platform.B);
}
throw new Exception($"Tried to find platform corresponding to tram {tram.id}, but none was found.");
}
/// <summary>
/// Try enter the station
/// </summary>
/// <param name="tram"></param>
/// <returns>True if tram could arrive at station</returns>
public void Occupy(Tram tram)
{
if (occupant is null)
{
occupant = tram;
Trace.Assert(lastOccupantId < 0 || occupant.id - 1 == lastOccupantId || occupant.id == 6001,
$"Tram arrived in wrong order, {occupant.id} arrived after {lastOccupantId} at {name} ({direction})");
lastOccupantId = occupant.id;
}
else
{
throw new Exception($"{tram.id} tried to occupy {name} in direction {direction}, but the station was full.");
}
}
/// <summary>
/// Remove passengers from station
/// </summary>
/// <param name="maxPassengers">Maximum amount that will still fit in the tram</param>
/// <returns>The amount of boarded passengers, and their arrival times</returns>
public (int, List <int>) BoardPassengers(Tram tram)
{
List <int> entrances = new List <int>();
int maxPassengers = tram.PassengerSpace();
int count = 0;
while (count < maxPassengers && waitingPassengers.Count > 0)
{
entrances.Add(waitingPassengers.Dequeue());
count++;
}
tram.AddPassengers(count);
return(count, entrances);
}
internal Tram OccupyFromDepotQueue(Platform platform)
{
Trace.Assert(IsFree(platform), $"Tried to occupy {platform} from queue, but platform was already taken.");
Tram tram = depotQueue.Dequeue();
if (platform == Platform.A)
{
occupant = tram;
}
else
{
occupant2 = tram;
}
// No tram yet, so first arrival
if (first == Platform.None)
{
first = platform;
}
return(tram);
}
/// <summary>
/// Occupy a platform of the station
/// </summary>
/// <param name="tram">The new occupant</param>
/// <param name="platform">The target platform</param>
internal void Occupy(Tram tram, Platform platform)
{
if (platform == Platform.A)
{
Trace.Assert(occupant == null, $"Tram {tram.id} tried to occupy {name} with platform {platform} but that platform was already occupied by {occupant?.id}");
occupant = tram;
}
else if (platform == Platform.B)
{
Trace.Assert(occupant2 == null, $"Tram {tram.id} tried to occupy {name} with platform {platform} but that platform was already occupied by {occupant2?.id}");
occupant2 = tram;
}
else
{
throw new Exception($"Unknown platform {platform}.");
}
// No tram yet, so first arrival
if (first == Platform.None)
{
first = platform;
}
}
// Put tram in station queue
public void Enqueue(Tram tram)
{
incomingTrams.Enqueue(tram);
}