public DateTime GetEndDate(DateTime assignmentDate, int minutes)
{
var holidaysCalendar = new HolidaysCalendar(assignmentDate);
//Validating start date
assignmentDate = ValidateDateAndPostponeTillTomorrow(assignmentDate, holidaysCalendar);
//Validating if it's within working hours
assignmentDate = ValidateAndMoveWorkingHours(assignmentDate, holidaysCalendar);
//Calculating hours from minutes
var assignmentHours = minutes / 60;
//Looping through calculated hours
//If more or equals to 8 hours we will add full day(24 hours),
//but will subtract 8 hours from calculated hours to take in consideration only 1 working day, which is 8 hours
const int dayHour = 8;
while (assignmentHours >= dayHour)
{
assignmentHours -= dayHour;
assignmentDate = assignmentDate.AddHours(24);
assignmentDate = ValidateDateAndPostponeTillTomorrow(assignmentDate, holidaysCalendar);
}
var remainderHours = assignmentHours % dayHour;
var remainderMinutes = minutes - (assignmentHours * 60);
assignmentDate = assignmentDate.AddHours(remainderHours);
assignmentDate = assignmentDate.AddMinutes(remainderMinutes);
assignmentDate = MoveToNextDayIfAfterHours(assignmentDate, holidaysCalendar);
return(assignmentDate);
}
private static DateTime MoveToNextDayIfAfterHours(DateTime assignmentDate, HolidaysCalendar holiday)
{
//Checks if after working hours
if (assignmentDate.Hour >= 17)
{
//Calcultes the remainder of hours to append to the next day
var nextDayHours = 8 + (assignmentDate.Hour - 17);
var nextDay = assignmentDate.AddDays(1).Day;
assignmentDate = new DateTime(assignmentDate.Year, assignmentDate.Month, nextDay, nextDayHours, assignmentDate.Minute, 0); //assignmentDate.AddDays(1).AddHours(nextDayHours);
//Validate if next day is not weekend/holiday
assignmentDate = ValidateDateAndPostponeTillTomorrow(assignmentDate, holiday);
//Validate lunch hours
assignmentDate = ValidateLunchHours(assignmentDate);
}
assignmentDate = ValidateLunchHours(assignmentDate);
return(assignmentDate);
}
/// <summary>
/// Method validates working hours from 8 am till 5 pm
/// Will also vadidate lunch from 12 pm to 1 pm
/// </summary>
/// <param name="assignmentDate"></param>
/// <param name="holiday"></param>
/// <returns></returns>
private static DateTime ValidateAndMoveWorkingHours(DateTime assignmentDate, HolidaysCalendar holiday)
{
const int workingStartTime = 8;
const int workingEndTime = 17;
if (assignmentDate.Hour >= workingEndTime)
{
Console.WriteLine($"Date: {assignmentDate} is after working hours.");
assignmentDate = assignmentDate.AddDays(1);
assignmentDate = new DateTime(assignmentDate.Year, assignmentDate.Month, assignmentDate.Day, workingStartTime, 0, 0);
//Need to make sure that the next day is not a weekend/holiday
assignmentDate = ValidateDateAndPostponeTillTomorrow(assignmentDate, holiday);
}
else if (assignmentDate.Hour < workingStartTime)
{
Console.WriteLine($"Date: {assignmentDate} is before working hours.");
assignmentDate = new DateTime(assignmentDate.Year, assignmentDate.Month, assignmentDate.Day, workingStartTime, 0, 0);
}
//Validate for lunch hours
assignmentDate = ValidateLunchHours(assignmentDate);
return(assignmentDate);
}
/// <summary>
/// Method validates whether given date is a holiday or a weekend
/// Will call itself again if needed
/// </summary>
/// <param name="assignmentDate"></param>
/// <param name="holiday"></param>
/// <returns></returns>
private static DateTime ValidateDateAndPostponeTillTomorrow(DateTime assignmentDate, HolidaysCalendar holiday)
{
//Checking whether if it's a weekend or holiday and if yes, adds 1 day
//Recursively calls itself again if condition is true
if (assignmentDate.DayOfWeek == DayOfWeek.Saturday || assignmentDate.DayOfWeek == DayOfWeek.Sunday || holiday.IsHoliday(assignmentDate))
{
Console.WriteLine($"Date: {assignmentDate} is a holiday or weekend.");
assignmentDate = assignmentDate.AddDays(1);
assignmentDate = ValidateDateAndPostponeTillTomorrow(assignmentDate, holiday);
}
return(assignmentDate);
}