using System;
using System.Globalization;
using System.Runtime.InteropServices;
public enum Location{
NewYork,
London,
Paris
}
public enum AlertLevel{
Early,
Standard,
Late
}
public static class Appointment{
private static bool isWindows = OperatingSystem.IsWindows();
public static DateTime ShowLocalTime(DateTime dtUtc) => dtUtc.ToLocalTime();
public static DateTime Schedule(string appointmentDateDescription, Location location){
DateTime localDateTimeIn = DateTime.Parse(appointmentDateDescription);
var timeZoneID = GetTimeZoneID(location);
var timeZone = TimeZoneInfo.FindSystemTimeZoneById(timeZoneID);
return TimeZoneInfo.ConvertTimeToUtc(localDateTimeIn, timeZone);
}
private static string GetTimeZoneID(Location location) => location switch {
Location.NewYork => isWindows ? "Eastern Standard Time" : "America/New\_York",
Location.London => isWindows ? "GMT Standard Time" : "Europe/London",
Location.Paris => isWindows ? "W. Europe Standard Time" : "Europe/Paris",
\_ => throw new ArgumentOutOfRangeException(),
};
public static DateTime GetAlertTime(DateTime appointment, AlertLevel alertLevel){
if(alertLevel == AlertLevel.Early){
return appointment.AddDays(-1);
}
else if(alertLevel == AlertLevel.Standard){
return appointment.AddHours(-1).AddMinutes(-45);
}
return appointment.AddMinutes(-30);
}
public static bool HasDaylightSavingChanged(DateTime dt, Location location){
var timeZoneID = GetTimeZoneID(location);
var timeZone = TimeZoneInfo.FindSystemTimeZoneById(timeZoneID);
return timeZone.IsDaylightSavingTime(dt.AddDays(-7)) != timeZone.IsDaylightSavingTime(dt);
}
public static DateTime NormalizeDateTime(string dtStr, Location location){
CultureInfo culture = CultureInfo.CreateSpecificCulture(location switch{
Location.NewYork =>"en-US",
Location.London => "en-GB",
Location.Paris => "fr-FR",
\_ => throw new ArgumentException()
});
return DateTime.TryParse(dtStr, culture, DateTimeStyles.None, out DateTime localDateTimeIn)? localDateTimeIn : new DateTime();
}
}
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