public static MergedBusinessDay Create(IEnumerable<IBusinessDay> businessDays)
{
if (businessDays == null)
throw new ArgumentNullException(nameof(businessDays));
var dayArray = businessDays.ToArray();
if (dayArray.Length == 0)
throw new ArgumentException(nameof(businessDays) + " is empty.");
var firstBusinessDayDate = dayArray[0].Identifier.Date;
if (dayArray.Any(day => !day.Identifier.Date.Equals(firstBusinessDayDate)))
throw new ArgumentException(nameof(businessDays) + " contains objects with different dates.");
var allAttendances = businessDays.SelectMany(x => x.Attendances);
var groupedAttendances = allAttendances.GroupBy(x => x.Attendee).OrderBy(x => x.Key.Identifier).ToArray();
var documents = groupedAttendances.Select(x => x.Key.Identifier.Document).ToArray();
var attendedTimes = groupedAttendances.Select(group => group.SelectMany(attendance => attendance.AttendedTimes).ToArray()).ToArray();
var sameDateBusinessDay = new MergedBusinessDay(firstBusinessDayDate, documents, attendedTimes);
return sameDateBusinessDay;
}
public Report(DateTime[] sortedDays, MergedBusinessDay[] sortedBusinessDays)
{
SortedDays = sortedDays;
SortedBusinessDays = sortedBusinessDays;
}