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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

#if !NO_REMOTING
using System;
using System.IO;
using System.Reactive.Concurrency;
using System.Reactive.PlatformServices;
using System.Runtime.CompilerServices;
using System.Threading;
#if NUNIT
using NUnit.Framework;
using TestClassAttribute = NUnit.Framework.TestFixtureAttribute;
using TestMethodAttribute = NUnit.Framework.TestAttribute;
using TestInitializeAttribute = NUnit.Framework.SetUpAttribute;
#else
using Microsoft.VisualStudio.TestTools.UnitTesting;
#endif

namespace ReactiveTests.Tests
{
    [TestClass]
    [Serializable]
    public class DefaultConcurrencyAbstractionLayerTest
    {
        private AppDomain _domain;

        [TestInitialize]
        public void Init()
        {
            if (_domain == null)
            {
                var cur = Utils.GetTestBaseDirectory();
                var sub = Path.Combine(cur, "NoCAL");

                if (!Directory.Exists(sub))
                {
                    Directory.CreateDirectory(sub);

                    foreach (var file in Directory.GetFiles(cur))
                    {
                        var fn = Path.GetFileName(file);
                        if (!file.Contains("PlatformServices"))
                            File.Copy(Path.Combine(cur, fn), Path.Combine(sub, fn));
                    }
                }

                _domain = AppDomain.CreateDomain("Default_CAL", null, new AppDomainSetup { ApplicationBase = sub });
            }
        }

        private void Run(CrossAppDomainDelegate a)
        {
            _domain.DoCallBack(a);
        }

        [TestMethod]
        public void Sleep()
        {
            var ran = new MarshalByRefCell<bool>();
            _domain.SetData("state", ran);

            Run(() =>
            {
                Scheduler.Immediate.Schedule(TimeSpan.FromMilliseconds(1), () =>
                {
                    var state = (MarshalByRefCell<bool>)_domain.GetData("state");
                    state.Value = true;
                });
            });

            Assert.IsTrue(ran.Value);
        }

        [TestMethod]
        public void QueueUserWorkItem()
        {
            var e = new MarshalByRefCell<ManualResetEvent> { Value = new ManualResetEvent(false) };
            _domain.SetData("state", e);

            Run(() =>
            {
                Scheduler.Default.Schedule(() =>
                {
                    var state = (MarshalByRefCell<ManualResetEvent>)_domain.GetData("state");
                    state.Value.Set();
                });
            });

            e.Value.WaitOne();
        }

        [TestMethod]
        public void StartTimer()
        {
            var e = new MarshalByRefCell<ManualResetEvent> { Value = new ManualResetEvent(false) };
            _domain.SetData("state", e);

            Run(() =>
            {
                Scheduler.Default.Schedule(TimeSpan.FromMilliseconds(10), () =>
                {
                    var state = (MarshalByRefCell<ManualResetEvent>)_domain.GetData("state");
                    state.Value.Set();
                });
            });

            e.Value.WaitOne();
        }

        [TestMethod]
        public void StartTimer_Cancel()
        {
            Run(() =>
            {
                Scheduler.Default.Schedule(TimeSpan.FromSeconds(60), () =>
                {
                    throw new InvalidOperationException("This shouldn't have happened!");
                }).Dispose();
            });
        }

        [TestMethod]
        public void StartPeriodicTimer()
        {
            var e = new MarshalByRefCell<ManualResetEvent> { Value = new ManualResetEvent(false) };
            _domain.SetData("state", e);

            Run(() =>
            {
                var n = 0;

                Scheduler.Default.SchedulePeriodic(TimeSpan.FromMilliseconds(10), () =>
                {
                    var state = (MarshalByRefCell<ManualResetEvent>)_domain.GetData("state");

                    if (n++ == 10)
                        state.Value.Set();
                });
            });

            e.Value.WaitOne();
        }

        [TestMethod]
        public void StartPeriodicTimer_Cancel()
        {
            Run(() =>
            {
                Scheduler.Default.SchedulePeriodic(TimeSpan.FromSeconds(60), () =>
                {
                    throw new InvalidOperationException("This shouldn't have happened!");
                }).Dispose();
            });
        }

        [TestMethod]
        public void CreateThread()
        {
            var e = new MarshalByRefCell<ManualResetEvent> { Value = new ManualResetEvent(false) };
            _domain.SetData("state", e);

            var r = new MarshalByRefCell<string> { Value = "" };
            _domain.SetData("res", r);

            Run(() =>
            {
                var state = (MarshalByRefCell<ManualResetEvent>)_domain.GetData("state");
                var res = (MarshalByRefCell<string>)_domain.GetData("res");

                var svc = (IServiceProvider)Scheduler.Default;

                var per = (ISchedulerPeriodic)svc.GetService(typeof(ISchedulerPeriodic));
                if (per == null)
                {
                    res.Value = "Failed to get ISchedulerPeriodic.";
                    state.Value.Set();
                    return;
                }

                var slr = (ISchedulerLongRunning)svc.GetService(typeof(ISchedulerLongRunning));
                if (slr == null)
                {
                    res.Value = "Failed to get ISchedulerLongRunning.";
                    state.Value.Set();
                    return;
                }

                var success = false;
                try
                {
                    slr.ScheduleLongRunning(42, null);
                }
                catch (ArgumentNullException)
                {
                    success = true;
                }

                if (!success)
                {
                    res.Value = "Failed null check ScheduleLongRunnign.";
                    state.Value.Set();
                    return;
                }

                state.Value.Set();
#if !NO_THREAD
                var w = new ManualResetEvent(false);

                var d = slr.ScheduleLongRunning(cancel =>
                {
                    while (!cancel.IsDisposed)
                        ;

                    w.Set();
                });

                Thread.Sleep(50);
                d.Dispose();
                w.WaitOne();
#else
                state.Value.Set();
#endif
            });

            e.Value.WaitOne();
            Assert.IsTrue(string.IsNullOrEmpty(r.Value));
        }

#if !NO_TPL
        [TestMethod]
        public void Cant_Locate_Scheduler()
        {
            if (!Utils.IsRunningWithPortableLibraryBinaries())
            {
                Cant_Locate_Scheduler_NoPlib();
            }
        }

        [MethodImpl(MethodImplOptions.NoInlining)]
        private void Cant_Locate_Scheduler_NoPlib()
        {
            var e = new MarshalByRefCell<Exception>();
            _domain.SetData("state", e);

            Run(() =>
            {
                var state = (MarshalByRefCell<Exception>)_domain.GetData("state");
                try
                {
                    Scheduler.TaskPool.Schedule(() => { });
                }
                catch (Exception ex)
                {
                    state.Value = ex;
                }
            });

            Assert.IsTrue(e.Value != null && e.Value is NotSupportedException);
        }
#endif

#if !NO_PERF && !NO_STOPWATCH
        [TestMethod]
        public void Stopwatch()
        {
            var e = new MarshalByRefCell<bool>();
            _domain.SetData("state", e);

            Run(() =>
            {
                var state = (MarshalByRefCell<bool>)_domain.GetData("state");

                var sw = Scheduler.Default.StartStopwatch();

                var fst = sw.Elapsed;
                Thread.Sleep(100);
                var snd = sw.Elapsed;

                state.Value = snd > fst;
            });

            Assert.IsTrue(e.Value);
        }
#endif

        [TestMethod]
        public void EnsureLoaded()
        {
            Assert.IsTrue(EnlightenmentProvider.EnsureLoaded());
        }
    }

    public class MarshalByRefCell<T> : MarshalByRefObject
    {
        public T Value;
    }
}
#endif