/* Copyright (c) Citrix Systems, Inc. 
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
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 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
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 */

using System;
using NUnit.Framework;
using XenAdmin;

namespace XenAdminTests.UnitTests
{
    [TestFixture, Category(TestCategories.Unit)]
    class TimeUtilTests
    {
        [Test]
        public void TicksBefore1970Check()
        {
            Assert.AreEqual(621355968000000000, Util.TicksBefore1970);
        }

        [Test]
        public void TicksToSecondsSince1970Conversion()
        {
            Assert.AreEqual((-1 * Util.TicksBefore1970 / TimeSpan.TicksPerSecond), Util.TicksToSecondsSince1970(0));
            Assert.AreEqual(0, Util.TicksToSecondsSince1970(Util.TicksBefore1970));
            Assert.AreEqual(1324771200, Util.TicksToSecondsSince1970(new DateTime(2011, 12, 25).Ticks));
        }

        [Test]
        public void ISODateTimeParse()
        {
            Assert.True(Util.TryParseIso8601DateTime("20111225T10:20:37Z", out var derived));
            Assert.AreEqual(new DateTime(2011, 12, 25, 10, 20, 37), derived);
            Assert.AreEqual(DateTimeKind.Utc, derived.Kind);
        }

        [Test]
        public void ISODateTimeParseWithBadFormat()
        {
            Assert.False(Util.TryParseIso8601DateTime("20111225T1020:37Z", out _));
        }

        [Test]
        public void ISODateTimeParseWithNullArg()
        {
            Assert.False(Util.TryParseIso8601DateTime(null, out _));
        }

        [Test]
        public void ToISODateTime()
        {
            string derived = Util.ToISO8601DateTime(new DateTime(2011, 12, 25, 10, 20, 37, DateTimeKind.Utc));
            Assert.AreEqual("20111225T10:20:37Z", derived);
        }

        [Test]
        public void ISODateTimeRoundTrip()
        {
            const string dateToParse = "20111225T10:20:37Z";

            string derived = Util.TryParseIso8601DateTime(dateToParse, out var result)
                ? Util.ToISO8601DateTime(result)
                : string.Empty;
            Assert.AreEqual(dateToParse, derived);
        }
    }
}