using System.Collections.Generic;
using System.Linq;
using FluentAssertions;
using Moq;
using NUnit.Framework;
using NzbDrone.Core.DecisionEngine;
using NzbDrone.Core.DecisionEngine.Specifications;
using NzbDrone.Core.IndexerSearch.Definitions;
using NzbDrone.Core.Movies;
using NzbDrone.Core.Parser;
using NzbDrone.Core.Parser.Model;
using NzbDrone.Core.Test.Framework;
using NzbDrone.Test.Common;

namespace NzbDrone.Core.Test.DecisionEngineTests
{
    [TestFixture]
    public class DownloadDecisionMakerFixture : CoreTest<DownloadDecisionMaker>
    {
        private List<ReleaseInfo> _reports;
        private RemoteMovie _remoteEpisode;
        private MappingResult _mappingResult;

        private Mock<IDecisionEngineSpecification> _pass1;
        private Mock<IDecisionEngineSpecification> _pass2;
        private Mock<IDecisionEngineSpecification> _pass3;

        private Mock<IDecisionEngineSpecification> _fail1;
        private Mock<IDecisionEngineSpecification> _fail2;
        private Mock<IDecisionEngineSpecification> _fail3;

        [SetUp]
        public void Setup()
        {
            ParseMovieTitle();

            _pass1 = new Mock<IDecisionEngineSpecification>();
            _pass2 = new Mock<IDecisionEngineSpecification>();
            _pass3 = new Mock<IDecisionEngineSpecification>();

            _fail1 = new Mock<IDecisionEngineSpecification>();
            _fail2 = new Mock<IDecisionEngineSpecification>();
            _fail3 = new Mock<IDecisionEngineSpecification>();

            _pass1.Setup(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null)).Returns(Decision.Accept);
            _pass2.Setup(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null)).Returns(Decision.Accept);
            _pass3.Setup(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null)).Returns(Decision.Accept);

            _fail1.Setup(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null)).Returns(Decision.Reject("fail1"));
            _fail2.Setup(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null)).Returns(Decision.Reject("fail2"));
            _fail3.Setup(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null)).Returns(Decision.Reject("fail3"));

            _reports = new List<ReleaseInfo> { new ReleaseInfo { Title = "Trolls.2016.720p.WEB-DL.DD5.1.H264-FGT" } };
            _remoteEpisode = new RemoteMovie
            {
                Movie = new Movie(),
                ParsedMovieInfo = new ParsedMovieInfo()
            };

            _mappingResult = new MappingResult { Movie = new Movie(), MappingResultType = MappingResultType.Success };
            _mappingResult.RemoteMovie = _remoteEpisode;

            Mocker.GetMock<IParsingService>()
                  .Setup(c => c.Map(It.IsAny<ParsedMovieInfo>(), It.IsAny<string>(), It.IsAny<SearchCriteriaBase>())).Returns(_mappingResult);
        }

        private void GivenSpecifications(params Mock<IDecisionEngineSpecification>[] mocks)
        {
            Mocker.SetConstant<IEnumerable<IDecisionEngineSpecification>>(mocks.Select(c => c.Object));
        }

        [Test]
        public void should_call_all_specifications()
        {
            GivenSpecifications(_pass1, _pass2, _pass3, _fail1, _fail2, _fail3);

            Subject.GetRssDecision(_reports).ToList();

            _fail1.Verify(c => c.IsSatisfiedBy(_remoteEpisode, null), Times.Once());
            _fail2.Verify(c => c.IsSatisfiedBy(_remoteEpisode, null), Times.Once());
            _fail3.Verify(c => c.IsSatisfiedBy(_remoteEpisode, null), Times.Once());
            _pass1.Verify(c => c.IsSatisfiedBy(_remoteEpisode, null), Times.Once());
            _pass2.Verify(c => c.IsSatisfiedBy(_remoteEpisode, null), Times.Once());
            _pass3.Verify(c => c.IsSatisfiedBy(_remoteEpisode, null), Times.Once());
        }

        [Test]
        public void should_return_rejected_if_single_specs_fail()
        {
            GivenSpecifications(_fail1);

            var result = Subject.GetRssDecision(_reports);

            result.Single().Approved.Should().BeFalse();
        }

        [Test]
        public void should_return_rejected_if_one_of_specs_fail()
        {
            GivenSpecifications(_pass1, _fail1, _pass2, _pass3);

            var result = Subject.GetRssDecision(_reports);

            result.Single().Approved.Should().BeFalse();
        }

        [Test]
        public void should_return_pass_if_all_specs_pass()
        {
            GivenSpecifications(_pass1, _pass2, _pass3);

            var result = Subject.GetRssDecision(_reports);

            result.Single().Approved.Should().BeTrue();
        }

        [Test]
        public void should_have_same_number_of_rejections_as_specs_that_failed()
        {
            GivenSpecifications(_pass1, _pass2, _pass3, _fail1, _fail2, _fail3);

            var result = Subject.GetRssDecision(_reports);
            result.Single().Rejections.Should().HaveCount(3);
        }

        [Test]
        public void should_not_attempt_to_map_episode_if_not_parsable()
        {
            GivenSpecifications(_pass1, _pass2, _pass3);
            _reports[0].Title = "Not parsable";
            _mappingResult.MappingResultType = MappingResultType.NotParsable;

            Subject.GetRssDecision(_reports).ToList();

            Mocker.GetMock<IParsingService>().Verify(c => c.Map(It.IsAny<ParsedMovieInfo>(), It.IsAny<string>(), It.IsAny<SearchCriteriaBase>()), Times.Never());

            _pass1.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
            _pass2.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
            _pass3.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
        }

        [Test]
        public void should_not_attempt_to_map_episode_if_series_title_is_blank()
        {
            GivenSpecifications(_pass1, _pass2, _pass3);
            _reports[0].Title = "1937 - Snow White and the Seven Dwarves";
            _mappingResult.MappingResultType = MappingResultType.NotParsable;

            var results = Subject.GetRssDecision(_reports).ToList();

            Mocker.GetMock<IParsingService>().Verify(c => c.Map(It.IsAny<ParsedMovieInfo>(), It.IsAny<string>(), It.IsAny<SearchCriteriaBase>()), Times.Never());

            _pass1.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
            _pass2.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
            _pass3.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());

            results.Should().NotBeEmpty();
        }

        [Test]
        public void should_return_rejected_result_for_unparsable_search()
        {
            GivenSpecifications(_pass1, _pass2, _pass3);
            _reports[0].Title = "1937 - Snow White and the Seven Dwarves";
            _mappingResult.MappingResultType = MappingResultType.NotParsable;

            Subject.GetSearchDecision(_reports, new MovieSearchCriteria()).ToList();

            Mocker.GetMock<IParsingService>().Verify(c => c.Map(It.IsAny<ParsedMovieInfo>(), It.IsAny<string>(), It.IsAny<SearchCriteriaBase>()), Times.Never());

            _pass1.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
            _pass2.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
            _pass3.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
        }

        [Test]
        public void should_not_attempt_to_make_decision_if_series_is_unknown()
        {
            GivenSpecifications(_pass1, _pass2, _pass3);

            _remoteEpisode.Movie = null;
            _mappingResult.MappingResultType = MappingResultType.TitleNotFound;

            Subject.GetRssDecision(_reports);

            _pass1.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
            _pass2.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
            _pass3.Verify(c => c.IsSatisfiedBy(It.IsAny<RemoteMovie>(), null), Times.Never());
        }

        [Test]
        public void broken_report_shouldnt_blowup_the_process()
        {
            GivenSpecifications(_pass1);

            Mocker.GetMock<IParsingService>().Setup(c => c.Map(It.IsAny<ParsedMovieInfo>(), It.IsAny<string>(), It.IsAny<SearchCriteriaBase>()))
                     .Throws<TestException>();

            _reports = new List<ReleaseInfo>
                {
                    new ReleaseInfo { Title = "Trolls.2016.720p.WEB-DL.DD5.1.H264-FGT" },
                    new ReleaseInfo { Title = "Trolls.2016.720p.WEB-DL.DD5.1.H264-FGT" },
                    new ReleaseInfo { Title = "Trolls.2016.720p.WEB-DL.DD5.1.H264-FGT" }
                };

            Subject.GetRssDecision(_reports);

            Mocker.GetMock<IParsingService>().Verify(c => c.Map(It.IsAny<ParsedMovieInfo>(), It.IsAny<string>(), It.IsAny<SearchCriteriaBase>()), Times.Exactly(_reports.Count));

            ExceptionVerification.ExpectedErrors(3);
        }

        [Test]
        public void should_return_unknown_series_rejection_if_series_is_unknown()
        {
            GivenSpecifications(_pass1, _pass2, _pass3);

            _remoteEpisode.Movie = null;

            var result = Subject.GetRssDecision(_reports);

            result.Should().HaveCount(1);
        }

        [Test]
        public void should_not_allow_download_if_series_is_unknown()
        {
            GivenSpecifications(_pass1, _pass2, _pass3);

            _remoteEpisode.Movie = null;
            _mappingResult.MappingResultType = MappingResultType.TitleNotFound;

            var result = Subject.GetRssDecision(_reports);

            result.Should().HaveCount(1);

            // result.First().RemoteMovie.DownloadAllowed.Should().BeFalse();
        }

        [Test]
        [Ignore("Series")]
        public void should_not_allow_download_if_no_episodes_found()
        {
            GivenSpecifications(_pass1, _pass2, _pass3);

            _remoteEpisode.Movie = null;

            var result = Subject.GetRssDecision(_reports);

            result.Should().HaveCount(1);

            // result.First().RemoteMovie.DownloadAllowed.Should().BeFalse();
        }

        [Test]
        public void should_return_a_decision_when_exception_is_caught()
        {
            GivenSpecifications(_pass1);

            Mocker.GetMock<IParsingService>().Setup(c => c.Map(It.IsAny<ParsedMovieInfo>(), It.IsAny<string>(), It.IsAny<SearchCriteriaBase>()))
                     .Throws<TestException>();

            _reports = new List<ReleaseInfo>
                {
                    new ReleaseInfo { Title = "Trolls.2016.720p.WEB-DL.DD5.1.H264-FGT" },
                };

            Subject.GetRssDecision(_reports).Should().HaveCount(1);

            ExceptionVerification.ExpectedErrors(1);
        }
    }
}