//
// TimeZoneTest.cs - NUnit Test Cases for the System.TimeZone struct
//
// Authors:
//	Martin Baulig (martin@gnome.org)
//	Sebastien Pouliot  <sebastien@ximian.com>
//
//   (C) 2002 Martin Baulig
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//

using NUnit.Framework;
using System;
using System.IO;
using System.Threading;
using System.Globalization;
using System.Runtime.Serialization.Formatters.Binary;

namespace MonoTests.System {

[TestFixture]
public class TimeZoneTest {

	private void CET (TimeZone t1) 
	{
		Assert.AreEqual("CET", t1.StandardName, "A01");
		Assert.AreEqual("CEST", t1.DaylightName, "A02");
	
		DaylightTime d1 = t1.GetDaylightChanges (2002);
		Assert.AreEqual("03/31/2002 02:00:00", d1.Start.ToString ("G"), "A03");
		Assert.AreEqual("10/27/2002 03:00:00", d1.End.ToString ("G"), "A04");
		Assert.AreEqual(36000000000L, d1.Delta.Ticks, "A05");
	
		DaylightTime d2 = t1.GetDaylightChanges (1996);
		Assert.AreEqual("03/31/1996 02:00:00", d2.Start.ToString ("G"), "A06");
		Assert.AreEqual("10/27/1996 03:00:00", d2.End.ToString ("G"), "A07");
		Assert.AreEqual(36000000000L, d2.Delta.Ticks, "A08");
	
		DateTime d3 = new DateTime (2002,2,25);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d3), "A09");
		DateTime d4 = new DateTime (2002,4,2);
		Assert.AreEqual(true, t1.IsDaylightSavingTime (d4), "A10");
		DateTime d5 = new DateTime (2002,11,4);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d5), "A11");
	
		Assert.AreEqual(36000000000L, t1.GetUtcOffset (d3).Ticks, "A12");
		Assert.AreEqual(72000000000L, t1.GetUtcOffset (d4).Ticks, "A13");
		Assert.AreEqual(36000000000L, t1.GetUtcOffset (d5).Ticks, "A14");
	}

	private void EST (TimeZone t1) 
	{
		// It could be EST though...
		//Assert.AreEqual("Eastern Standard Time", t1.StandardName, "B01");
		//Assert.AreEqual("Eastern Daylight Time", t1.DaylightName, "B02");

		DaylightTime d1 = t1.GetDaylightChanges (2002);
		Assert.AreEqual("04/07/2002 02:00:00", d1.Start.ToString ("G"), "B03");
		Assert.AreEqual("10/27/2002 02:00:00", d1.End.ToString ("G"), "B04");
		Assert.AreEqual(36000000000L, d1.Delta.Ticks, "B05");

		DaylightTime d2 = t1.GetDaylightChanges (1996);
		Assert.AreEqual("04/07/1996 02:00:00", d2.Start.ToString ("G"), "B06");
		Assert.AreEqual("10/27/1996 02:00:00", d2.End.ToString ("G"), "B07");
		Assert.AreEqual(36000000000L, d2.Delta.Ticks, "B08");

		DateTime d3 = new DateTime (2002,2,25);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d3), "B09");
		DateTime d4 = new DateTime (2002,4,8);
		Assert.AreEqual(true, t1.IsDaylightSavingTime (d4), "B10");
		DateTime d5 = new DateTime (2002,11,4);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d5), "B11");

		Assert.AreEqual(-180000000000L, t1.GetUtcOffset (d3).Ticks, "B12");
		Assert.AreEqual(-144000000000L, t1.GetUtcOffset (d4).Ticks, "B13");
		Assert.AreEqual(-180000000000L, t1.GetUtcOffset (d5).Ticks, "B14");
	}

	private void TST (TimeZone t1) 
	{
		Assert.AreEqual("Tokyo Standard Time", t1.StandardName, "C01");
		Assert.AreEqual("Tokyo Standard Time", t1.DaylightName, "C02");

		DateTime d3 = new DateTime (2002,2,25);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d3), "C09");
		DateTime d4 = new DateTime (2002,4,8);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d4), "C10");
		DateTime d5 = new DateTime (2002,11,4);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d5), "C11");

		Assert.AreEqual(324000000000L, t1.GetUtcOffset (d3).Ticks, "C12");
		Assert.AreEqual(324000000000L, t1.GetUtcOffset (d4).Ticks, "C13");
		Assert.AreEqual(324000000000L, t1.GetUtcOffset (d5).Ticks, "C14");
	}

	private void GMT (TimeZone t1) {
		// Probably wont work on MS.NET, but is better than nothing. Where do
		// we change our implementation to match theirs?
		
		Assert.AreEqual("GMT", t1.StandardName, "D01");
		Assert.IsTrue("BST" == t1.DaylightName || "IST" == t1.DaylightName, "D02");
	
		DaylightTime d1 = t1.GetDaylightChanges (2002);
		Assert.AreEqual("03/31/2002 01:00:00", d1.Start.ToString ("G"), "D03");
		Assert.AreEqual("10/27/2002 02:00:00", d1.End.ToString ("G"), "D04");
		Assert.AreEqual(36000000000L, d1.Delta.Ticks, "D05");
	
		DaylightTime d2 = t1.GetDaylightChanges (1996);
		Assert.AreEqual("03/31/1996 01:00:00", d2.Start.ToString ("G"), "D06");
		Assert.AreEqual("10/27/1996 02:00:00", d2.End.ToString ("G"), "D07");
		Assert.AreEqual(36000000000L, d2.Delta.Ticks, "D08");
	
		DateTime d3 = new DateTime (2002,2,25);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d3), "D09");
		DateTime d4 = new DateTime (2002,4,2);
		Assert.AreEqual(true, t1.IsDaylightSavingTime (d4), "D10");
		DateTime d5 = new DateTime (2002,11,4);
		Assert.AreEqual(false, t1.IsDaylightSavingTime (d5), "D11");
	
		Assert.AreEqual(0L, t1.GetUtcOffset (d3).Ticks, "D12");
		Assert.AreEqual(36000000000L, t1.GetUtcOffset (d4).Ticks, "D13");
		Assert.AreEqual(0L, t1.GetUtcOffset (d5).Ticks, "D14");
	}

	[Test]
	[Culture ("")]
	public void TestCtors ()
	{
		TimeZone t1 = TimeZone.CurrentTimeZone;
		switch (t1.StandardName) {
			case "CET":
				CET (t1);
				break;
			case "Eastern Standard Time":
			case "EST":
				EST (t1);
				break;
			case "Tokyo Standard Time":
				TST (t1);
				break;
			case "GMT":
				GMT (t1);
				break;
			default:
				NUnit.Framework.Assert.Ignore ("Your time zone (" + t1.StandardName + ") isn't defined in the test case");
				break;
		}
        }

	[Test]
	[Category ("TargetJvmNotWorking")]
	public void CurrentTimeZone_SerializationRoundtrip ()
	{
		TimeZone tz = TimeZone.CurrentTimeZone;
		BinaryFormatter bf = new BinaryFormatter ();
		MemoryStream ms = new MemoryStream ();
		bf.Serialize (ms, tz);

		ms.Position = 0;
		TimeZone clone = (TimeZone) bf.Deserialize (ms);

		Assert.AreEqual (tz.DaylightName, clone.DaylightName, "DaylightName");
		Assert.AreEqual (tz.StandardName, clone.StandardName, "StandardName");
	}

	static private byte[] serialized_timezone = {
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#endif
	};

	[Test]
	[Category ("NotWorking")] 
	// 1.x - deserialize but strings are null
	// 2.x - eexception when creating a datetime with a negative value
	public void DeserializeKnownValue ()
	{
		MemoryStream ms = new MemoryStream (serialized_timezone);
		BinaryFormatter bf = new BinaryFormatter ();
		TimeZone tz = (TimeZone) bf.Deserialize (ms);
		Assert.AreEqual ("Eastern Daylight Time", tz.DaylightName, "DaylightName");
		Assert.AreEqual ("Eastern Standard Time", tz.StandardName, "StandardName");
	}

	[Test]
	public void ToLocalTimeAtDSTBoundaries ()
	{
		TimeZone tz = TimeZone.CurrentTimeZone;
		DateTime dst_start_utc = tz.GetDaylightChanges(2007).Start.ToUniversalTime ();

		if (dst_start_utc == DateTime.MinValue)
			return;
		Assert.IsTrue (tz.ToLocalTime (dst_start_utc.Subtract (new TimeSpan (0, 1, 0))) < tz.ToLocalTime (dst_start_utc), "0:1:59 < 0:3:00");
		Assert.IsTrue (tz.ToLocalTime (dst_start_utc) < tz.ToLocalTime (dst_start_utc.Add (new TimeSpan (0, 1, 0))), "0:3:00 < 0:3:01");
		Assert.IsTrue (tz.ToLocalTime (dst_start_utc.Add (new TimeSpan (0, 1, 0))) < tz.ToLocalTime (dst_start_utc.Add (new TimeSpan (0, 59, 0))), "0:3:01 < 0:3:59");
		Assert.IsTrue (tz.ToLocalTime (dst_start_utc.Add (new TimeSpan (0, 59, 0))) < tz.ToLocalTime (dst_start_utc.Add (new TimeSpan (1, 0, 0))), "0:3:59 < 0:4:00");
		Assert.IsTrue (tz.ToLocalTime (dst_start_utc.Add (new TimeSpan (1, 0, 0))) < tz.ToLocalTime (dst_start_utc.Add (new TimeSpan (1, 1, 0))), "0:4:00 < 0:4:01");
	}

		[Test]
		public void StaticProperties ()
		{
			Assert.IsNotNull (TimeZoneInfo.Local, "Local");
			Assert.IsNotNull (TimeZoneInfo.Utc, "Utc");
		}
		
		[Test]
		public void FindSystemTimeZoneById ()
		{
			TimeZoneInfo tzi = TimeZoneInfo.FindSystemTimeZoneById ("Canada/Eastern");
			Assert.AreEqual ("EDT", tzi.DaylightName, "DaylightName");
			Assert.AreEqual ("EST", tzi.StandardName, "StandardName");
			Assert.IsTrue (tzi.SupportsDaylightSavingTime, "SupportsDaylightSavingTime");
		}

#if MOBILE
		// On device we cannot read the OS file system to look for /etc/localtime
		// and /usr/share/zoneinfo - so we must initialize the BCL TimeZoneInfo
		// from NSTimeZoneInfo. The tests here check the code paths between the
		// two types - if they break then TimeZoneInfo work work at all
		// ref: http://bugzilla.xamarin.com/show_bug.cgi?id=1790
		
		bool incomplete_data_on_simulator_only_bug;

		[Test]
		public void GetSystemTimeZones ()
		{
			// if test is executed a second time then it report less than 400 (about 127) items available
			if (incomplete_data_on_simulator_only_bug)
				Assert.Ignore ("known to fail on some iOS simulator versions - see source comments");
			
			try {
				Assert.That (TimeZoneInfo.GetSystemTimeZones ().Count, Is.GreaterThan (400), "GetSystemTimeZones");
			} catch (NullReferenceException) {
				// that's a weird one. It failed on iOS 5.1 *beta* simulator (on Lion) but it worked on *final*
				// now it fails on Snow Leopard the same way (incomplete data) with iOS5 simulator (OS update ?)
				// but it *never*ever* failed on devices
				incomplete_data_on_simulator_only_bug = true;
				if (MonoTouch.ObjCRuntime.Runtime.Arch == MonoTouch.ObjCRuntime.Arch.SIMULATOR)
					Assert.Ignore ("known to fail on some iOS simulator versions - see source comments");
			}
		}
#endif
	}
}