/// <summary>
/// Get all available apartments with the desired capacity and a given time frame.
/// </summary>
/// <param name="minimalCapacity">Minimum capacity of the apartments.</param>
/// <param name="doubleBeds">Minimal number of double beds.</param>
/// <param name="from">Beginning date.</param>
/// <param name="to">Ending date.</param>
public static IEnumerable <ApartmentInfo> GetAvailableApartments(int minimalCapacity, int doubleBeds, DateTime from, DateTime to)
{
var apartments = GetApartmentsWithCapacityAtLeast(minimalCapacity)
.Where(apartment => apartment.DoubleBeds >= doubleBeds).ToList();
var reservations = ReservationProvider.GetAllReservationsFrom(from).Where(reservation => reservation.To <= to);
var occupiedApartments = new List <ApartmentInfo>();
foreach (var reservation in reservations)
{
if (!occupiedApartments.Contains(reservation.Apartment))
{
occupiedApartments.Add(reservation.Apartment);
}
}
return(apartments.Except(occupiedApartments));
}