using System;
using System.Linq;
using UnitTestSharp;

namespace Glass.UnitTests
{
    public class ExceptionEntryTests : TestFixture
    {
        public static readonly ExceptionSite SiteA = ExceptionLogTests.SiteA;
        public static readonly ExceptionSite SiteB = ExceptionLogTests.SiteB;

        public class CtorTests : TestFixture
        {
            public void StampsTheFrameAndTimeAsBothFirstAndLast()
            {
                var entry = new ExceptionEntry(new InvalidOperationException(), frame: 2,
                    time: TimeSpan.FromMilliseconds(20));

                CheckEqual(2L, entry.FirstFrame);
                CheckEqual(2L, entry.LastFrame);
                CheckEqual(TimeSpan.FromMilliseconds(20), entry.FirstTime);
                CheckEqual(TimeSpan.FromMilliseconds(20), entry.LastTime);
            }

            public void KeepsTheException()
            {
                var thrown = new InvalidOperationException();
                CheckEqual(thrown, new ExceptionEntry(thrown, frame: 0, time: TimeSpan.Zero).Exception);
            }

            public void StartsWithNoHits()
            {
                var entry = new ExceptionEntry(new InvalidOperationException(), frame: 0, time: TimeSpan.Zero);

                CheckEqual(0, entry.Count);
                CheckEqual(0, entry.Sites.Count);
            }

            public void StartsNeitherIgnoredNorSnoozed()
            {
                var entry = new ExceptionEntry(new InvalidOperationException(), frame: 0, time: TimeSpan.Zero);

                CheckFalse(entry.Ignored);
                CheckNull(entry.SnoozedUntil);
            }
        }

        public class RecordHitTests : TestFixture
        {
            private const string Pedigree = "window > okButton";

            private ExceptionEntry entry;

            public override void TestSetup()
            {
                entry = new ExceptionEntry(new InvalidOperationException(), frame: 0, time: TimeSpan.Zero);
            }

            public void Always_CountsTheHit()
            {
                entry.RecordHit(SiteA, Pedigree, frame: 0, time: TimeSpan.Zero);
                entry.RecordHit(SiteA, Pedigree, frame: 0, time: TimeSpan.Zero);

                CheckEqual(2, entry.Count);
            }

            public void Always_StampsTheFrameAndTimeAsLastOnly()
            {
                entry.RecordHit(SiteA, Pedigree, frame: 1, time: TimeSpan.FromMilliseconds(16));

                CheckEqual(0L, entry.FirstFrame);
                CheckEqual(TimeSpan.Zero, entry.FirstTime);
                CheckEqual(1L, entry.LastFrame);
                CheckEqual(TimeSpan.FromMilliseconds(16), entry.LastTime);
            }

            public void NewSite_IsAddedWithItsPedigreeAndReportedAsNew()
            {
                CheckTrue(entry.RecordHit(SiteA, Pedigree, frame: 0, time: TimeSpan.Zero));

                CheckEqual(new[] { SiteA }, entry.Sites.ToArray());
                CheckEqual(new[] { Pedigree }, entry.PedigreesOf(SiteA).ToArray());
            }

            public void RepeatedSiteAndPedigree_AreNeitherAddedAgainNorReportedAsNew()
            {
                entry.RecordHit(SiteA, Pedigree, frame: 0, time: TimeSpan.Zero);

                CheckFalse(entry.RecordHit(SiteA, Pedigree, frame: 0, time: TimeSpan.Zero));
                CheckEqual(new[] { SiteA }, entry.Sites.ToArray());
                CheckEqual(new[] { Pedigree }, entry.PedigreesOf(SiteA).ToArray());
            }

            public void RepeatedSiteByAnotherPath_KeepsBothPedigreesButIsNotReportedAsNew()
            {
                entry.RecordHit(SiteA, Pedigree, frame: 0, time: TimeSpan.Zero);

                CheckFalse(entry.RecordHit(SiteA, "dialog > okButton", frame: 0, time: TimeSpan.Zero));
                CheckEqualCommutative(new[] { Pedigree, "dialog > okButton" }, entry.PedigreesOf(SiteA));
            }

            public void SeveralSites_AreEachKeptOnce()
            {
                entry.RecordHit(SiteB, Pedigree, frame: 0, time: TimeSpan.Zero);
                entry.RecordHit(SiteA, Pedigree, frame: 0, time: TimeSpan.Zero);
                entry.RecordHit(SiteB, Pedigree, frame: 0, time: TimeSpan.Zero);

                CheckEqualCommutative(new[] { SiteA, SiteB }, entry.Sites);
            }
        }

        public class PedigreesOfTests : TestFixture
        {
            public void SiteThatNeverHit_HasNone()
            {
                var entry = new ExceptionEntry(new InvalidOperationException(), frame: 0, time: TimeSpan.Zero);
                entry.RecordHit(SiteA, "window > okButton", frame: 0, time: TimeSpan.Zero);

                CheckEqual(0, entry.PedigreesOf(SiteB).Count);
            }
        }

        public class IsSkippingAtTests : TestFixture
        {
            private static readonly TimeSpan Now = TimeSpan.FromMilliseconds(16);

            private ExceptionEntry entry;

            public override void TestSetup()
            {
                entry = new ExceptionEntry(new InvalidOperationException(), frame: 0, time: TimeSpan.Zero);
            }

            public void NeitherIgnoredNorSnoozed_IsNotSkipping()
            {
                CheckFalse(entry.IsSkippingAt(Now));
            }

            public void Ignored_IsSkipping()
            {
                entry.Ignored = true;
                CheckTrue(entry.IsSkippingAt(Now));
            }

            public void SnoozedUntilLater_IsSkipping()
            {
                entry.SnoozedUntil = Now + TimeSpan.FromTicks(1);
                CheckTrue(entry.IsSkippingAt(Now));
            }

            public void SnoozedUntilNow_IsNotSkipping()
            {
                entry.SnoozedUntil = Now;
                CheckFalse(entry.IsSkippingAt(Now));
            }

            public void IgnoredWithAnExpiredSnooze_IsSkipping()
            {
                entry.Ignored = true;
                entry.SnoozedUntil = TimeSpan.Zero;

                CheckTrue(entry.IsSkippingAt(Now));
            }
        }
    }
}