/// <summary>
/// Возвращает приблизительное количество дней, за которое наберется ресурс remains с заданной среднестатистической наработкой
/// </summary>
/// <param name="from"></param>
/// <param name="remains"></param>
/// <param name="average"></param>
/// <param name="conditionType"></param>
/// <returns></returns>
public static Double?GetApproximateDays(DateTime from,
Lifelength remains, AverageUtilization average,
ThresholdConditionType conditionType = ThresholdConditionType.WhicheverFirst)
{
//
if (remains == null || average == null)
{
return(null);
}
if (remains.CalendarValue != null && remains.CalendarValue != 0)
{
DateTime to = from.AddCalendarSpan(remains.CalendarSpan);
return((to - from).Days);
}
Double?d1 = average.CyclesPerMonth != 0 && remains.Cycles != null ? new Double?(remains.Cycles.Value / (average.Hours / average.Cycles)) : null;
Double?d2 = average.HoursPerMonth != 0 && remains.Hours != null ? remains.Hours * 30 / average.HoursPerMonth : null;
Double?d3 = remains.Days;
// Whichever First vs. Whichever Later
if (conditionType == ThresholdConditionType.WhicheverFirst)
{
// Выбираем минимум
Double?min = null;
if (d1 != null)
{
min = d1;
}
if (d2 != null && (min == null || d2 < min))
{
min = d2;
}
if (d3 != null && (min == null || d3 < min))
{
min = d3;
}
// Возвращаем результат
return(min);
}
// Выбираем максимум
Double?max = null;
if (d1 != null)
{
max = d1;
}
if (d2 != null && (max == null || d2 > max))
{
max = d2;
}
if (d3 != null && (max == null || d3 > max))
{
max = d3;
}
// Возвращаем результат
return(max);
}
/// <summary>
/// Представляет условие выполения директивы в виде строки
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
private string ThresholdConditionToString(ThresholdConditionType type)
{
if (type == ThresholdConditionType.WhicheverFirst)
{
return("w.f.");
}
if (type == ThresholdConditionType.WhicheverLater)
{
return("w.l.");
}
throw new Exception("1525: Failed to specify directive threshold condition type");
}
/// <summary>
/// Возвращает дату, когда наберется ресурс remains с заданной среднестатистической наработкой
/// </summary>
/// <param name="remains"></param>
/// <param name="average"></param>
/// <param name="conditionType"></param>
/// <returns></returns>
public static DateTime?GetApproximateDate(Lifelength remains, AverageUtilization average, ThresholdConditionType conditionType = ThresholdConditionType.WhicheverFirst)
{
//
if (remains == null || average == null)
{
return(null);
}
// расчитываем количество дней
Double?days = GetApproximateDays(DateTime.Today, remains, average, conditionType);
if (days == null)
{
return(null);
}
// возвращаем дату
return(DateTime.Today.AddDays(days.Value));
}
