public async Task RecalculateShiftWorkItemAssignments(List <ScheduledShiftAssignmentDto> scheduledShiftAssignments)
{
var scheduledShiftsForRecalc = scheduledShiftAssignments
.GroupBy(x => x.Id)
.Select(x => x.First())
.GroupBy(x => new { x.ScheduledShiftId, x.StartsAt, x.EndsAt })
.OrderBy(x => x.Key.StartsAt);
var scheduledShiftIds = scheduledShiftsForRecalc.Select(x => x.Key.ScheduledShiftId).Distinct().ToList();
var allWorkItems = (await _workItemRepository.GetWorkItemsForShifts(scheduledShiftIds)).ToList();
var allWorkItemAssignments = (await _workItemRepository.GetWorkItemAssignmentsForShifts(scheduledShiftIds)).ToList();
var allRecurringWorkItems = (await _workItemRepository.GetRecurringWorkItemsForShifts(scheduledShiftIds)).ToList();
var allShiftRecurringWorkItems = (await _workItemRepository.GetShiftRecurringWorkItemsForShifts(scheduledShiftIds)).ToList();
foreach (var scheduledShift in scheduledShiftsForRecalc)
{
await RecalculateSingleShiftWorkItemAssignments(scheduledShift.Key.ScheduledShiftId, scheduledShift.ToList(), allWorkItems, allWorkItemAssignments, allRecurringWorkItems, allShiftRecurringWorkItems);
}
}