private async Task UpdateExceptionsAsync(string id, IAppointmentSchedule schedule, bool force)
{
var exceptions = schedule.Recurrence.Exceptions.Where(kv => kv.Value != null);
foreach (var kv in exceptions)
{
using (Logger.Scope($"GoogleCalendar.UpdateException({kv.Key.Date})"))
{
EventsResource.InstancesRequest instancesRequest = _service.Events.Instances(CalendarId, id);
var originalStart = new DateTime(kv.Key.Year, kv.Key.Month, kv.Key.Day,
schedule.Start.Hour, schedule.Start.Minute, schedule.Start.Second);
TimeSpan utcOffset = schedule.StartTimeZone.GetUtcOffset(originalStart);
string offsetFormat = (utcOffset < TimeSpan.Zero ? "\\-" : "") + "hh\\:mm";
instancesRequest.OriginalStart = $"{originalStart:yyyy-MM-ddTHH:mm:ss}{utcOffset.ToString(offsetFormat)}";
Events instances = await instancesRequest.ExecuteAsync().ConfigureAwait(false);
Event instance = instances.Items.FirstOrDefault();
if (instance == null)
{
Logger.Warning($"Failed to find instance of \"{kv.Value}\" at {instancesRequest.OriginalStart} to create an exception");
continue;
}
if (force || kv.Value.LastModifiedDateTime > (instance.Updated ?? DateTime.MinValue))
{
await UpdateAppointmentAsync(instance.Id, instance.Sequence, kv.Value, force).ConfigureAwait(false);
}
}
}
}
public static IEnumerable <string> ToRfc5545Rules(this IAppointmentSchedule schedule)
{
var recurrence = schedule.Recurrence;
if (recurrence == null)
{
yield break;
}
var sb = new StringBuilder();
sb.Append("RRULE:FREQ=");
switch (recurrence.Frequency)
{
case RecurrenceFrequency.Daily:
sb.Append("DAILY");
break;
case RecurrenceFrequency.Weekly:
sb.Append("WEEKLY");
break;
case RecurrenceFrequency.Monthly:
sb.Append("MONTHLY");
break;
case RecurrenceFrequency.Yearly:
sb.Append("YEARLY");
break;
}
if (recurrence.Count.HasValue)
{
sb.Append($";COUNT={recurrence.Count.Value}");
}
if (recurrence.Interval.HasValue)
{
sb.Append($";INTERVAL={recurrence.Interval.Value}");
}
if (recurrence.Until.HasValue)
{
sb.Append($";UNTIL={recurrence.Until.Value.Date:yyyyMMddT000000Z}"); // TODO: is UTC okay?
}
if (recurrence.WeekDay.HasValue)
{
sb.Append($";BYDAY={ToRfc5545String(recurrence.WeekDay.Value)}");
}
if (recurrence.YearMonth.HasValue)
{
sb.Append($";BYMONTH={recurrence.YearMonth.Value}");
}
if (recurrence.MonthDay.HasValue)
{
sb.Append($";BYMONTHDAY={recurrence.MonthDay.Value}");
}
if (recurrence.Exceptions != null)
{
string startTime = schedule.Start.ToString("HHmmss");
string startTimezone = TZConvert.WindowsToIana(schedule.StartTimeZone.Id);
foreach (DateTime exceptionDate in recurrence.Exceptions.Where(kv => kv.Value == null).Select(kv => kv.Key))
{
yield return($"EXDATE;TZID={startTimezone}:{exceptionDate:yyyyMMdd}T{startTime}");
}
}
yield return(sb.ToString());
}
