private DateTime GetVariableHoliday(HolidayConfiguration holidayConfiguration, int year)
{
var occurrenceFormat = holidayConfiguration.Occurrence.Split('|');
int month = int.Parse(occurrenceFormat[0]);
DayOfWeek dayOfWeek = DayOfWeek.Monday;
int occurrence = int.Parse(occurrenceFormat[2]);
return(Enumerable.Range(1, 7)
.Select(day => new DateTime(year, month, day))
.First(dateTime => (dateTime.DayOfWeek == dayOfWeek))
.AddDays(7 * (occurrence - 1)));
}
private DateTime GetFixedHoliday(HolidayConfiguration holidayConfiguration, int year)
{
var holidayDate = DateTime.ParseExact($"{holidayConfiguration.DayMonth}/{year}", "d/M/yyyy", CultureInfo.InvariantCulture);
if (holidayConfiguration.IsObserved)
{
if (holidayDate.DayOfWeek == DayOfWeek.Saturday)
{
holidayDate = holidayDate.AddDays(2);
}
else if (holidayDate.DayOfWeek == DayOfWeek.Sunday)
{
holidayDate = holidayDate.AddDays(1);
}
}
return(holidayDate);
}
private DateTime GetHoliday(HolidayConfiguration holidayConfiguration, int year)
{
if (!Utility.IsValidHolidayConfig(holidayConfiguration))
{
throw new InvalidOperationException("Invalid holiday configurations");
}
var holidayDate = new DateTime();
if (!string.IsNullOrEmpty(holidayConfiguration.DayMonth))
{
holidayDate = GetFixedHoliday(holidayConfiguration, year);
}
else if (!string.IsNullOrEmpty(holidayConfiguration.Occurrence))
{
holidayDate = GetVariableHoliday(holidayConfiguration, year);
}
return(holidayDate);
}
public static bool IsValidHolidayConfig(HolidayConfiguration holidayConfiguration)
{
if (holidayConfiguration == null)
{
return(false);
}
else if (!string.IsNullOrEmpty(holidayConfiguration.DayMonth))
{
return(DateTime.TryParseExact($"{holidayConfiguration.DayMonth}/2020", "d/M/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime _));
}
else if (string.IsNullOrEmpty(holidayConfiguration.Occurrence))
{
return(false);
}
else if (!string.IsNullOrEmpty(holidayConfiguration.Occurrence))
{
return(holidayConfiguration.Occurrence.Split('|').Length == 3);
}
return(true);
}