//
// CaseInsensitiveHashCodeProviderTest
//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//

using System;
using System.Collections;
using System.Globalization;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;

using NUnit.Framework;

namespace MonoTests.System.Collections
{
	[TestFixture]
	public class CaseInsensitiveHashCodeProviderTest
	{
		private CultureInfo old_culture;

		[SetUp]
		public void SetUp ()
		{
			old_culture = Thread.CurrentThread.CurrentCulture;
		}

		[TearDown]
		public void TearDown ()
		{
			Thread.CurrentThread.CurrentCulture = old_culture;
		}

		[Test]
		public void Default ()
		{
			CaseInsensitiveHashCodeProvider cih = new CaseInsensitiveHashCodeProvider (
				CultureInfo.CurrentCulture);
			int h1 = cih.GetHashCode ("Test String");

			cih = CaseInsensitiveHashCodeProvider.Default;
			int h2 = cih.GetHashCode ("Test String");

			Assert.AreEqual (h1, h2, "#1");

			Thread.CurrentThread.CurrentCulture = new CultureInfo ("en-US");
			CaseInsensitiveHashCodeProvider cih1 = CaseInsensitiveHashCodeProvider.Default;
			Thread.CurrentThread.CurrentCulture = new CultureInfo ("nl-BE");
			CaseInsensitiveHashCodeProvider cih2 = CaseInsensitiveHashCodeProvider.Default;
			Assert.IsFalse (object.ReferenceEquals (cih1, cih2), "#2");
		}

		[Test]
		public void Default_MS ()
		{
			// MS always returns new instance
			CaseInsensitiveHashCodeProvider cih1 = CaseInsensitiveHashCodeProvider.Default;
			CaseInsensitiveHashCodeProvider cih2 = CaseInsensitiveHashCodeProvider.Default;
			Assert.IsFalse (object.ReferenceEquals (cih1, cih2));
		}

		[Test]
		public void DefaultInvariant ()
		{
			CaseInsensitiveHashCodeProvider cih = new CaseInsensitiveHashCodeProvider (
				CultureInfo.InvariantCulture);
			int h1 = cih.GetHashCode ("Test String");

			cih = CaseInsensitiveHashCodeProvider.DefaultInvariant;
			int h2 = cih.GetHashCode ("Test String");

			Assert.AreEqual (h1, h2, "#1");

			CaseInsensitiveHashCodeProvider cih1 = CaseInsensitiveHashCodeProvider.DefaultInvariant;
			CaseInsensitiveHashCodeProvider cih2 = CaseInsensitiveHashCodeProvider.DefaultInvariant;
			Assert.IsTrue (object.ReferenceEquals (cih1, cih2));
		}

		[Test]
		public void HashCode ()
		{
			CaseInsensitiveHashCodeProvider cih = new CaseInsensitiveHashCodeProvider ();
			int h1 = cih.GetHashCode ("Test String");
			int h2 = cih.GetHashCode ("test string");
			int h3 = cih.GetHashCode ("TEST STRING");

			Assert.IsTrue (h1 == h2, "Mixed Case != lower case");
			Assert.IsTrue (h1 == h3, "Mixed Case != UPPER CASE");

			h1 = cih.GetHashCode ("one");
			h2 = cih.GetHashCode ("another");
			// Actually this is quite possible.
			Assert.IsFalse (h1 == h2);
		}

		[Test]
		public void Constructor0_Serialization ()
		{
			CaseInsensitiveHashCodeProvider cihcp = new CaseInsensitiveHashCodeProvider ();
			BinaryFormatter bf = new BinaryFormatter ();
			MemoryStream ms = new MemoryStream ();
			bf.Serialize (ms, cihcp);
			byte[] ser1 = ms.ToArray ();

			cihcp = new CaseInsensitiveHashCodeProvider (CultureInfo.CurrentCulture);
			ms = new MemoryStream ();
			bf.Serialize (ms, cihcp);
			byte[] ser2 = ms.ToArray ();

			cihcp = CaseInsensitiveHashCodeProvider.Default;
			ms = new MemoryStream ();
			bf.Serialize (ms, cihcp);
			byte[] ser3 = ms.ToArray ();

			Assert.AreEqual (ser1, ser2, "#1");
			Assert.AreEqual (ser2, ser3, "#2");
		}

		[Test]
		public void Constructor1_Culture_Null ()
		{
			try {
				new CaseInsensitiveHashCodeProvider ((CultureInfo) null);
				Assert.Fail ("#1");
			} catch (ArgumentNullException ex) {
				Assert.AreEqual (typeof (ArgumentNullException), ex.GetType (), "#2");
				Assert.IsNull (ex.InnerException, "#3");
				Assert.IsNotNull (ex.Message, "#4");
				Assert.IsNotNull (ex.ParamName, "#5");
				Assert.AreEqual ("culture", ex.ParamName, "#6");
			}
		}

		[Test]
		public void Constructor1_Serialization ()
		{
			CaseInsensitiveHashCodeProvider cihcp = new CaseInsensitiveHashCodeProvider (CultureInfo.InvariantCulture);
			BinaryFormatter bf = new BinaryFormatter ();
			MemoryStream ms = new MemoryStream ();
			bf.Serialize (ms, cihcp);
			byte[] ser1 = ms.ToArray ();

			cihcp = CaseInsensitiveHashCodeProvider.DefaultInvariant;
			ms = new MemoryStream ();
			bf.Serialize (ms, cihcp);
			byte[] ser2 = ms.ToArray ();

			Assert.AreEqual (ser1, ser2, "#1");
		}

		[Test]
		public void SerializationRoundtrip ()
		{
			CaseInsensitiveHashCodeProvider enus = new CaseInsensitiveHashCodeProvider (new CultureInfo ("en-US"));
			BinaryFormatter bf = new BinaryFormatter ();
			MemoryStream ms = new MemoryStream ();
			bf.Serialize (ms, enus);

			ms.Position = 0;
			CaseInsensitiveHashCodeProvider clone = (CaseInsensitiveHashCodeProvider) bf.Deserialize (ms);
			Assert.AreEqual (enus.GetHashCode (String.Empty), clone.GetHashCode (String.Empty), "GetHashCode(string)");
			Assert.AreEqual (enus.GetHashCode (Int32.MinValue), clone.GetHashCode (Int32.MinValue), "GetHashCode(int)");
		}

		[Test]
		public void Deserialize ()
		{
			BinaryFormatter bf = new BinaryFormatter ();

			MemoryStream ms = new MemoryStream (serialized_en_us);
			CaseInsensitiveHashCodeProvider enus = (CaseInsensitiveHashCodeProvider) bf.Deserialize (ms);
			Assert.IsNotNull (enus, "en-US");

			ms = new MemoryStream (serialized_fr_ca);
			CaseInsensitiveHashCodeProvider frca = (CaseInsensitiveHashCodeProvider) bf.Deserialize (ms);
			Assert.IsNotNull (frca, "fr-CA");
		}

		private static byte [] serialized_en_us = new byte [] {
			0x00, 0x01, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x01, 0x00, 0x00, 0x00, 0x32, 0x53, 0x79, 0x73, 
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			0x00, 0x01, 0x09, 0x04, 0x00, 0x00, 0x0B 
		};

		private static byte [] serialized_fr_ca = new byte [] {
			0x00, 0x01, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x01, 0x00, 0x00, 0x00, 0x32, 0x53, 0x79, 0x73, 
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		};
	}
}