using System;
using System.Threading;
using Amphora;
using UnitTestSharp;

namespace Ariadne.UnitTests
{
    public class TickTimeTests : TestFixture
    {
        public class DeadlineAfterTests : TestFixture
        {
            private static readonly TickTime Now =
                new TickTime(Duration.FromMilliseconds(16), Duration.FromSeconds(10));

            public void Span_IsAddedToTheGameTime()
            {
                CheckEqual(Duration.FromSeconds(13), Now.DeadlineAfter(Duration.FromSeconds(3)));
            }

            public void ZeroSpan_IsTheGameTime()
            {
                CheckEqual(Duration.FromSeconds(10), Now.DeadlineAfter(Duration.Zero));
            }

            public void NegativeSpan_IsBeforeTheGameTime()
            {
                CheckEqual(Duration.FromSeconds(7), Now.DeadlineAfter(Duration.FromSeconds(-3)));
            }

            public void Forever_IsForever()
            {
                CheckEqual(Duration.Forever, Now.DeadlineAfter(Duration.Forever));
            }

            public void NegativeForever_IsNegativeForeverSoTheWaitDoesNotPause()
            {
                CheckEqual(-Duration.Forever, Now.DeadlineAfter(-Duration.Forever));
                CheckTrue(Now.DeadlineAfter(-Duration.Forever) <= Now.GameTime);
            }

            public void InfiniteTimeSpan_IsForever()
            {
                CheckEqual(Duration.Forever, Now.DeadlineAfter(Timeout.InfiniteTimeSpan));
            }

            public void OtherNegativeTimeSpan_IsAnOrdinaryNegativeSpan()
            {
                CheckEqual(Duration.FromMilliseconds(9998), Now.DeadlineAfter(TimeSpan.FromMilliseconds(-2)));
            }

            public void SpanTooLongToAdd_IsTheLongestFiniteDuration()
            {
                CheckEqual(Duration.MaxValue, Now.DeadlineAfter(Duration.MaxValue));
                CheckEqual(Duration.MaxValue, Now.DeadlineAfter(TimeSpan.MaxValue));
                CheckTrue(Now.DeadlineAfter(Duration.MaxValue).IsFinite);
            }
        }
    }
}