public static async Task<List<FavoriteStopViewModel>> GetFavoritesViewModel(ITransitRepository repository,
ITransitClient client, DateTimeOffset currentTime, IEnumerable<int> stopIds, LatLong? optionalUserLocation)
{
var staticData = await repository.GetStaticDataAsync();
var favoriteStops = GetFavoriteStops(staticData, stopIds, optionalUserLocation);
var scheduleTask = GetSchedule(repository, client, currentTime, favoriteStops.Select(f => f.Id));
var schedule = await scheduleTask;
var result = favoriteStops.Select(favorite => ToViewModel(favorite, staticData, schedule, currentTime))
.ToList();
return result;
}
private static List<FavoriteStop> GetFavoriteStops(BusStaticData staticData, IEnumerable<int> stopIds, LatLong? optionalUserLocation)
{
var favoriteStops = stopIds.Where(staticData.Stops.ContainsKey).Select(id =>
{
var stop = staticData.Stops[id];
var distanceFromUser = optionalUserLocation != null
? DistanceTo(optionalUserLocation.Value.Lat, optionalUserLocation.Value.Lon, stop.Lat, stop.Long, 'M')
: double.NaN;
return new FavoriteStop(stop.ID, stop.Name, stop.RouteNames, distanceFromUser, isNearestStop: false);
})
.ToList();
var nearestStop = optionalUserLocation != null
? staticData.Stops.Values
.Aggregate((s1, s2) =>
DistanceTo(optionalUserLocation.Value.Lat, optionalUserLocation.Value.Lon, s1.Lat, s1.Long, 'M') <
DistanceTo(optionalUserLocation.Value.Lat, optionalUserLocation.Value.Lon, s2.Lat, s2.Long, 'M') ? s1 : s2)
: null;
if (nearestStop != null && !favoriteStops.Any(f => f.Id == nearestStop.ID))
{
var distanceFromUser = optionalUserLocation != null
? DistanceTo(optionalUserLocation.Value.Lat, optionalUserLocation.Value.Lon, nearestStop.Lat, nearestStop.Long, 'M')
: double.NaN;
favoriteStops.Add(new FavoriteStop(nearestStop.ID, nearestStop.Name, nearestStop.RouteNames,
distanceFromUser, isNearestStop: true));
}
favoriteStops.Sort((f1, f2) => f1.DistanceFromUser.CompareTo(f2.DistanceFromUser));
return favoriteStops;
}