// ReSharper disable RedundantUsingDirective

using System.Linq;
using System;
using System.Collections.Generic;
using System.Threading;
using FluentAssertions;
using NUnit.Framework;
using NzbDrone.Core.Model;
using NzbDrone.Core.Providers.Jobs;
using NzbDrone.Core.Test.Framework;
using NzbDrone.Test.Common;
using NzbDrone.Test.Common.AutoMoq;

namespace NzbDrone.Core.Test.ProviderTests.JobProviderTests
{
    [TestFixture]
    // ReSharper disable InconsistentNaming
    public class JobProviderFixture : CoreTest
    {

        FakeJob fakeJob;
        SlowJob slowJob;
        BrokenJob brokenJob;
        DisabledJob disabledJob;

        [SetUp]
        public void Setup()
        {
            WithRealDb();
            fakeJob = new FakeJob();
            slowJob = new SlowJob();
            brokenJob = new BrokenJob();
            disabledJob = new DisabledJob();
        }

        [TearDown]
        public void TearDown()
        {
            Mocker.Resolve<JobProvider>().Queue.Should().BeEmpty();
        }

        private void WaitForQueue()
        {
            Console.WriteLine("Waiting for queue to clear.");
            var stopWatch = Mocker.Resolve<JobProvider>().StopWatch;

            while (stopWatch.IsRunning)
            {
                Thread.Sleep(100);
            }
        }

        [Test]
        public void running_scheduled_jobs_should_updates_last_execution_time()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { fakeJob };
            Mocker.SetConstant(BaseFakeJobs);

            //Act
            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.QueueScheduled();

            //Assert
            WaitForQueue();
            var settings = jobProvider.All();
            settings.First().LastExecution.Should().BeWithin(TimeSpan.FromSeconds(10));
            fakeJob.ExecutionCount.Should().Be(1);
        }

        [Test]
        public void failing_scheduled_job_should_mark_job_as_failed()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { brokenJob };
            Mocker.SetConstant(BaseFakeJobs);

            //Act
            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.QueueScheduled();

            //Assert
            WaitForQueue();
            var settings = jobProvider.All();
            settings.First().LastExecution.Should().BeWithin(TimeSpan.FromSeconds(10));
            settings.First().Success.Should().BeFalse();
            brokenJob.ExecutionCount.Should().Be(1);
            ExceptionVerification.ExcpectedErrors(1);
        }

        [Test]
        public void scheduler_skips_jobs_that_arent_mature_yet()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { fakeJob };
            Mocker.SetConstant(BaseFakeJobs);

            //Act
            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.QueueScheduled();
            WaitForQueue();
            jobProvider.QueueScheduled();
            WaitForQueue();

            //Assert
            fakeJob.ExecutionCount.Should().Be(1);
        }

        [Test]
        //This test will confirm that the concurrency checks are rest
        //after execution so the job can successfully run.
        public void can_run_async_job_again()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { fakeJob };
            Mocker.SetConstant(BaseFakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();

            //Act
            jobProvider.QueueJob(typeof(FakeJob));
            WaitForQueue();
            jobProvider.QueueJob(typeof(FakeJob));
            WaitForQueue();

            //Assert
            jobProvider.Queue.Should().BeEmpty();
            fakeJob.ExecutionCount.Should().Be(2);
        }

        [Test]
        public void no_concurent_jobs()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { slowJob };
            Mocker.SetConstant(BaseFakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.QueueJob(typeof(SlowJob), 1);
            jobProvider.QueueJob(typeof(SlowJob), 2);
            jobProvider.QueueJob(typeof(SlowJob), 3);

            WaitForQueue();

            jobProvider.Queue.Should().BeEmpty();
            slowJob.ExecutionCount.Should().Be(3);
            ExceptionVerification.AssertNoUnexcpectedLogs();
        }


        [Test]
        public void can_run_broken_job_again()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { brokenJob };

            Mocker.SetConstant(BaseFakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();

            //Act
            jobProvider.QueueJob(typeof(BrokenJob));
            WaitForQueue();

            jobProvider.QueueJob(typeof(BrokenJob));
            WaitForQueue();

            //Assert
            brokenJob.ExecutionCount.Should().Be(2);
            ExceptionVerification.ExcpectedErrors(2);
        }

        [Test]
        public void schedule_hit_should_be_ignored_if_queue_is_running()
        {
            IList<IJob> fakeJobs = new List<IJob> { slowJob, fakeJob };

            Mocker.SetConstant(fakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();


            //Act
            jobProvider.QueueJob(typeof(SlowJob));
            jobProvider.QueueScheduled();
            WaitForQueue();

            //Assert
            slowJob.ExecutionCount.Should().Be(1);
            fakeJob.ExecutionCount.Should().Be(0);
        }


        [Test]
        public void can_queue_jobs_at_the_same_time()
        {

            IList<IJob> BaseFakeJobs = new List<IJob> { slowJob, fakeJob };
            Mocker.SetConstant(BaseFakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();


            jobProvider.QueueJob(typeof(SlowJob));
            var thread1 = new Thread(() => jobProvider.QueueJob(typeof(FakeJob)));
            var thread2 = new Thread(() => jobProvider.QueueJob(typeof(FakeJob)));

            thread1.Start();
            thread2.Start();

            thread1.Join();
            thread2.Join();

            WaitForQueue();

            fakeJob.ExecutionCount.Should().Be(1);
            slowJob.ExecutionCount.Should().Be(1);
            jobProvider.Queue.Should().BeEmpty();
        }

        [Test]
        public void Init_Jobs()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { fakeJob };

            Mocker.SetConstant(BaseFakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();

            //Act
            jobProvider.Initialize();

            //assert
            var timers = jobProvider.All();
            timers.Should().HaveCount(1);
            timers[0].Interval.Should().Be(fakeJob.DefaultInterval);
            timers[0].Name.Should().Be(fakeJob.Name);
            timers[0].TypeName.Should().Be(fakeJob.GetType().ToString());
            timers[0].LastExecution.Should().HaveYear(2000);
            timers[0].Enable.Should().BeTrue();
        }

        [Test]
        public void Init_Timers_only_registers_once()
        {
            for (int i = 0; i < 2; i++)
            {
                var fakeTimer = new FakeJob();
                IList<IJob> BaseFakeJobs = new List<IJob> { fakeTimer };

                Mocker.SetConstant(BaseFakeJobs);

                var jobProvider = Mocker.Resolve<JobProvider>();
                jobProvider.Initialize();
            }

            var Mocker2 = new AutoMoqer();

            Mocker2.SetConstant(Db);
            var assertjobProvider = Mocker2.Resolve<JobProvider>();
            var timers = assertjobProvider.All();

            //Assert
            timers.Should().HaveCount(1);
            timers[0].Enable.Should().BeTrue();
        }

        [Test]
        public void jobs_with_zero_interval_are_registered_as_disabled()
        {
            IList<IJob> fakeJobs = new List<IJob> { disabledJob };
            Mocker.SetConstant(fakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();

            //Assert
            jobProvider.All().Should().HaveCount(1);
            jobProvider.All().First().Enable.Should().BeFalse();
        }

        [Test]
        public void Get_Next_Execution_Time()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { fakeJob };
            Mocker.SetConstant(BaseFakeJobs);

            //Act
            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.QueueScheduled();
            WaitForQueue();

            //Assert
            var next = jobProvider.NextScheduledRun(typeof(FakeJob));
            jobProvider.All().Should().HaveCount(1);
            jobProvider.All().First().LastExecution.Should().Be(next.AddMinutes(-fakeJob.DefaultInterval));
        }

        [Test]
        public void disabled_jobs_arent_run_by_scheduler()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { disabledJob };
            Mocker.SetConstant(BaseFakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.QueueScheduled();

            WaitForQueue();

            //Assert
            disabledJob.ExecutionCount.Should().Be(0);
        }

        [Test]
        public void job_with_specific_target_should_not_update_last_execution()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { fakeJob };
            Mocker.SetConstant(BaseFakeJobs);

            //Act
            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.QueueJob(typeof(FakeJob), 10);

            WaitForQueue();

            //Assert
            jobProvider.All().First().LastExecution.Should().HaveYear(2000);
        }

        [Test]
        public void job_with_specific_target_should_not_set_success_flag()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { fakeJob };
            Mocker.SetConstant(BaseFakeJobs);

            //Act
            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.QueueJob(typeof(FakeJob), 10);

            WaitForQueue();

            //Assert
            jobProvider.All().First().Success.Should().BeFalse();
        }


        [Test]
        public void duplicated_queue_item_should_start_queue_if_its_not_running()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { fakeJob };
            Mocker.SetConstant(BaseFakeJobs);

            var stuckQueueItem = new JobQueueItem
                                    {
                                        JobType = fakeJob.GetType(),
                                        TargetId = 12,
                                        SecondaryTargetId = 0
                                    };

            //Act
            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();
            jobProvider.Queue.Add(stuckQueueItem);

            WaitForQueue();
            jobProvider.QueueJob(stuckQueueItem.JobType, stuckQueueItem.TargetId, stuckQueueItem.SecondaryTargetId);
            WaitForQueue();

            //Assert
            fakeJob.ExecutionCount.Should().Be(1);
        }


        [Test]
        public void Item_added_to_queue_while_scheduler_runs_should_be_executed()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { slowJob, disabledJob };
            Mocker.SetConstant(BaseFakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();
            jobProvider.Initialize();

            var _jobThread = new Thread(jobProvider.QueueScheduled);
            _jobThread.Start();

            Thread.Sleep(200);

            jobProvider.QueueJob(typeof(DisabledJob), 12);

            WaitForQueue();

            //Assert
            slowJob.ExecutionCount.Should().Be(1);
            disabledJob.ExecutionCount.Should().Be(1);
        }

        [Test]
        public void trygin_to_queue_unregistered_job_should_fail()
        {
            IList<IJob> BaseFakeJobs = new List<IJob> { slowJob, disabledJob };
            Mocker.SetConstant(BaseFakeJobs);

            var jobProvider = Mocker.Resolve<JobProvider>();

            jobProvider.Initialize();
            jobProvider.QueueJob(typeof(string));

            WaitForQueue();
            ExceptionVerification.ExcpectedErrors(1);
        }

    }


}