#if !(UNITY_4_5 || UNITY_4_6 || UNITY_4_7 || UNITY_5_0 || UNITY_5_1 || UNITY_5_2)
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine.UI;
using UnityEngine.Scripting;
using UniRx;
using UniRx.Async;
using UnityEngine.SceneManagement;
#if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
using System.Threading.Tasks;
#endif
using UnityEngine.Networking;

#if !UNITY_2019_3_OR_NEWER
using UnityEngine.Experimental.LowLevel;
#else
using UnityEngine.LowLevel;
#endif

#if !UNITY_WSA
using Unity.Jobs;
#endif
using Unity.Collections;
using System.Threading;
using NUnit.Framework;
using UnityEngine.TestTools;
using FluentAssertions;

namespace UniRx.AsyncTests
{
    public class AsyncTest
    {
#if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
#if !UNITY_WSA

        public struct MyJob : IJob
        {
            public int loopCount;
            public NativeArray<int> inOut;
            public int result;

            public void Execute()
            {
                result = 0;
                for (int i = 0; i < loopCount; i++)
                {
                    result++;
                }
                inOut[0] = result;
            }
        }

        [UnityTest]
        public IEnumerator DelayAnd() => UniTask.ToCoroutine(async () =>
        {
            await UniTask.Yield(PlayerLoopTiming.PostLateUpdate);

            var time = Time.realtimeSinceStartup;

            Time.timeScale = 0.5f;
            try
            {
                await UniTask.Delay(TimeSpan.FromSeconds(3));

                var elapsed = Time.realtimeSinceStartup - time;
                ((int)Math.Round(TimeSpan.FromSeconds(elapsed).TotalSeconds, MidpointRounding.ToEven)).Should().Be(6);
            }
            finally
            {
                Time.timeScale = 1.0f;
            }
        });

        [UnityTest]
        public IEnumerator DelayIgnore() => UniTask.ToCoroutine(async () =>
        {
            var time = Time.realtimeSinceStartup;

            Time.timeScale = 0.5f;
            try
            {
                await UniTask.Delay(TimeSpan.FromSeconds(3), ignoreTimeScale: true);

                var elapsed = Time.realtimeSinceStartup - time;
                ((int)Math.Round(TimeSpan.FromSeconds(elapsed).TotalSeconds, MidpointRounding.ToEven)).Should().Be(3);
            }
            finally
            {
                Time.timeScale = 1.0f;
            }
        });

        [UnityTest]
        public IEnumerator WhenAll() => UniTask.ToCoroutine(async () =>
        {
            var a = UniTask.FromResult(999);
            var b = UniTask.Yield(PlayerLoopTiming.Update, CancellationToken.None).AsAsyncUnitUniTask();
            var c = UniTask.DelayFrame(99);

            var (a2, b2, c2) = await UniTask.WhenAll(a, b, c);
            a2.Should().Be(999);
            b2.Should().Be(AsyncUnit.Default);
            c2.Should().Be(99);
        });

        [UnityTest]
        public IEnumerator WhenAny() => UniTask.ToCoroutine(async () =>
        {
            var a = UniTask.FromResult(999);
            var b = UniTask.Yield(PlayerLoopTiming.Update, CancellationToken.None).AsAsyncUnitUniTask();
            var c = UniTask.DelayFrame(99);

            var (win, a2, b2, c2) = await UniTask.WhenAny(a, b, c);
            win.Should().Be(0);
            a2.hasResult.Should().Be(true);
            a2.result0.Should().Be(999);
            b2.hasResult.Should().Be(false);
            c2.hasResult.Should().Be(false);
        });

        [UnityTest]
        public IEnumerator BothEnumeratorCheck() => UniTask.ToCoroutine(async () =>
        {
            await ToaruCoroutineEnumerator(); // wait 5 frame:)
            await ToaruCoroutineEnumerator().ConfigureAwait(PlayerLoopTiming.PostLateUpdate);
        });

        [UnityTest]
        public IEnumerator JobSystem() => UniTask.ToCoroutine(async () =>
        {
            var job = new MyJob() { loopCount = 999, inOut = new NativeArray<int>(1, Allocator.TempJob) };
            JobHandle.ScheduleBatchedJobs();
            await job.Schedule();
            job.inOut[0].Should().Be(999);
            job.inOut.Dispose();
        });

        class MyMyClass
        {
            public int MyProperty { get; set; }
        }

        [UnityTest]
        public IEnumerator WaitUntil() => UniTask.ToCoroutine(async () =>
        {
            bool t = false;

            UniTask.DelayFrame(10, PlayerLoopTiming.PostLateUpdate).ContinueWith(_ => t = true).Forget();

            var startFrame = Time.frameCount;
            await UniTask.WaitUntil(() => t, PlayerLoopTiming.EarlyUpdate);

            var diff = Time.frameCount - startFrame;
            diff.Should().Be(11);
        });

        [UnityTest]
        public IEnumerator WaitWhile() => UniTask.ToCoroutine(async () =>
        {
            bool t = true;

            UniTask.DelayFrame(10, PlayerLoopTiming.PostLateUpdate).ContinueWith(_ => t = false).Forget();

            var startFrame = Time.frameCount;
            await UniTask.WaitWhile(() => t, PlayerLoopTiming.EarlyUpdate);

            var diff = Time.frameCount - startFrame;
            diff.Should().Be(11);
        });

        [UnityTest]
        public IEnumerator WaitUntilValueChanged() => UniTask.ToCoroutine(async () =>
        {
            var v = new MyMyClass { MyProperty = 99 };

            UniTask.DelayFrame(10, PlayerLoopTiming.PostLateUpdate).ContinueWith(_ => v.MyProperty = 1000).Forget();

            var startFrame = Time.frameCount;
            await UniTask.WaitUntilValueChanged(v, x => x.MyProperty, PlayerLoopTiming.EarlyUpdate);

            var diff = Time.frameCount - startFrame;
            diff.Should().Be(11);
        });

        [UnityTest]
        public IEnumerator SwitchTo() => UniTask.ToCoroutine(async () =>
        {
            await UniTask.Yield();

            var currentThreadId = Thread.CurrentThread.ManagedThreadId;

            UnityEngine.Debug.Log("Before:" + currentThreadId);


            await UniTask.SwitchToThreadPool();
            //await UniTask.SwitchToThreadPool();
            //await UniTask.SwitchToThreadPool();


            



            var switchedThreadId = Thread.CurrentThread.ManagedThreadId;

            UnityEngine.Debug.Log("After:" + switchedThreadId);


            currentThreadId.Should().NotBe(switchedThreadId);


            await UniTask.Yield();

            var switchedThreadId2 = Thread.CurrentThread.ManagedThreadId;

            currentThreadId.Should().Be(switchedThreadId2);
        });

        //[UnityTest]
        //public IEnumerator ObservableConversion() => UniTask.ToCoroutine(async () =>
        //{
        //    var v = await Observable.Range(1, 10).ToUniTask();
        //    v.Is(10);

        //    v = await Observable.Range(1, 10).ToUniTask(useFirstValue: true);
        //    v.Is(1);

        //    v = await UniTask.DelayFrame(10).ToObservable().ToTask();
        //    v.Is(10);

        //    v = await UniTask.FromResult(99).ToObservable();
        //    v.Is(99);
        //});

        //[UnityTest]
        //public IEnumerator AwaitableReactiveProperty() => UniTask.ToCoroutine(async () =>
        //{
        //    var rp1 = new ReactiveProperty<int>(99);

        //    UniTask.DelayFrame(100).ContinueWith(x => rp1.Value = x).Forget();

        //    await rp1;

        //    rp1.Value.Is(100);

        //    // var delay2 = UniTask.DelayFrame(10);
        //    // var (a, b ) = await UniTask.WhenAll(rp1.WaitUntilValueChangedAsync(), delay2);

        //});

        //[UnityTest]
        //public IEnumerator AwaitableReactiveCommand() => UniTask.ToCoroutine(async () =>
        //{
        //    var rc = new ReactiveCommand<int>();

        //    UniTask.DelayFrame(100).ContinueWith(x => rc.Execute(x)).Forget();

        //    var v = await rc;

        //    v.Is(100);
        //});

        [UnityTest]
        public IEnumerator ExceptionlessCancellation() => UniTask.ToCoroutine(async () =>
        {
            var cts = new CancellationTokenSource();

            UniTask.DelayFrame(10).ContinueWith(_ => cts.Cancel()).Forget();

            var first = Time.frameCount;
            var (canceled, value) = await UniTask.DelayFrame(100, cancellationToken: cts.Token).SuppressCancellationThrow();

            (Time.frameCount - first).Should().Be(11); // 10 frame canceled
            canceled.Should().Be(true);
        });

        [UnityTest]
        public IEnumerator ExceptionCancellation() => UniTask.ToCoroutine(async () =>
        {
            var cts = new CancellationTokenSource();

            UniTask.DelayFrame(10).ContinueWith(_ => cts.Cancel()).Forget();

            bool occur = false;
            try
            {
                var value = await UniTask.DelayFrame(100, cancellationToken: cts.Token);
            }
            catch (OperationCanceledException)
            {
                occur = true;
            }
            occur.Should().BeTrue();
        });

        IEnumerator ToaruCoroutineEnumerator()
        {
            yield return null;
            yield return null;
            yield return null;
            yield return null;
            yield return null;
        }

        [UnityTest]
        public IEnumerator ExceptionUnobserved1() => UniTask.ToCoroutine(async () =>
        {
            bool calledEx = false;
            Action<Exception> action = exx =>
            {
                calledEx = true;
                exx.Message.Should().Be("MyException");
            };

            UniTaskScheduler.UnobservedTaskException += action;

            var ex = InException1();
            ex = default(UniTask);

            await UniTask.DelayFrame(3);

            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();

            await UniTask.DelayFrame(1);

            calledEx.Should().BeTrue();

            UniTaskScheduler.UnobservedTaskException -= action;
        });

        [UnityTest]
        public IEnumerator ExceptionUnobserved2() => UniTask.ToCoroutine(async () =>
        {
            bool calledEx = false;
            Action<Exception> action = exx =>
            {
                calledEx = true;
                exx.Message.Should().Be("MyException");
            };

            UniTaskScheduler.UnobservedTaskException += action;

            var ex = InException2();
            ex = default(UniTask<int>);

            await UniTask.DelayFrame(3);

            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();

            await UniTask.DelayFrame(1);

            calledEx.Should().BeTrue();

            UniTaskScheduler.UnobservedTaskException -= action;
        });

        async UniTask InException1()
        {
            await UniTask.Yield();
            throw new Exception("MyException");
        }

        async UniTask<int> InException2()
        {
            await UniTask.Yield();
            throw new Exception("MyException");
        }

        [UnityTest]
        public IEnumerator NestedEnumerator() => UniTask.ToCoroutine(async () =>
        {
            var time = Time.realtimeSinceStartup;

            await ParentCoroutineEnumerator();

            var elapsed = Time.realtimeSinceStartup - time;
            ((int)Math.Round(TimeSpan.FromSeconds(elapsed).TotalSeconds, MidpointRounding.ToEven)).Should().Be(3);
        });

        IEnumerator ParentCoroutineEnumerator()
        {
            yield return ChildCoroutineEnumerator();
        }

        IEnumerator ChildCoroutineEnumerator()
        {
            yield return new WaitForSeconds(3);
        }

#endif
#endif
    }
}

#endif