using FluentAssertions;
using Strata.ContinuousImprovement.Biz.Exploration;
using Strata.ContinuousImprovement.Biz.Exploration.CaseTypeFamilies;
using Strata.ContinuousImprovement.Biz.Exploration.Filters;
using Strata.ContinuousImprovement.Biz.Test.Unit.Utilities;
using System.Diagnostics.CodeAnalysis;

namespace Strata.ContinuousImprovement.Biz.Test.Integration.SnowflakeIntegrationTests
{
    [ExcludeFromCodeCoverage]
    [TestFixture, Category("Integration"), Category("CCI")]
    public class FlexibleExplorationSummaryTest : IntegrationTestBase
    {
        private static readonly Guid _configurationGuid = Guid.Parse("aa4cba4f-2506-462c-8e34-c45b21653988");
        private static int _totalCaseTypeFamilyCount;

        [OneTimeSetUp]
        public async Task SetupExploration()
        {
            var explorationInfo = CreateExplorationInfo();
            var summaries = await ExplorationService.GetCaseTypeFamilySummariesAsync(explorationInfo, CancellationToken.None);

            if (!summaries.Any())
                throw new InvalidOperationException("No Case Type Family summaries returned for setup.");

            _totalCaseTypeFamilyCount = summaries.Count();
        }

        [Test]
        public async Task GetCaseTypeFamilySummaries_WhenNoFilters_ReturnsAll()
        {
            //  arrange
            var explorationInfo = CreateExplorationInfo();

            // act
            var summaries = await ExplorationService.GetCaseTypeFamilySummariesAsync(explorationInfo, CancellationToken.None);

            // assert
            summaries.Should().HaveCount(_totalCaseTypeFamilyCount);
            await VerifySummaries(summaries);
        }

        [TestCaseSource(nameof(ExclusionCriteriaTestCases))]
        public async Task GetCaseTypeFamilySummaries_WithExclusions(ExclusionCriteria exclusions)
        {
            await RunExclusionSummaryTests(exclusions);
        }

        [Test]
        public async Task GetCaseTypeFamilySummaries_WithFilters_ReturnsFiltered()
        {
            // arrange - filtering on mortality (IsSelected = true => MortalityRate = 1)
            var booleanFilter = CreateBooleanFilter(ChipKey.Mortality);
            var explorationInfo = CreateExplorationInfo(booleanFilter);

            // act
            var summaries = await ExplorationService.GetCaseTypeFamilySummariesAsync(explorationInfo, CancellationToken.None);

            // assert
            summaries.Should().HaveCountGreaterThan(0);
            summaries.Should().HaveCountLessThan(_totalCaseTypeFamilyCount, "Filters should reduce data returned");
            // mortality rate only applies to included encounters
            summaries.Where(x => x.Data.IncludedEncounterCount > 0).Should().OnlyContain(s => s.Data.MortalityRate == 1);
            await VerifySummaries(summaries);
        }

        [Test]
        public async Task GetCaseTypeFamilySummaries_WithFiltersAndExclusions_ReturnsFilteredAndExcluded()
        {
            // arrange - iqr + mad exclusion combo with a boolean filter
            var booleanFilter = CreateBooleanFilter(ChipKey.Mortality);
            var exclusions = new ExclusionCriteria
            {
                CostExclusionType = ExclusionCriteriaType.Iqr,
                CostExclusionValue = 1.5,
                LosExclusionType = ExclusionCriteriaType.Mad,
                LosExclusionValue = 2
            };
            var explorationInfo = CreateExplorationInfo(booleanFilter, exclusions);

            // act
            var summaries = await ExplorationService.GetCaseTypeFamilySummariesAsync(explorationInfo, CancellationToken.None);

            // assert
            summaries.Should().HaveCountGreaterThan(0);
            summaries.Should().HaveCountLessThan(_totalCaseTypeFamilyCount);
            // mortality rate only applies to included encounters
            summaries.Where(x => x.Data.IncludedEncounterCount > 0).Should().OnlyContain(s => s.Data.MortalityRate == 1);
            summaries.Should().Contain(s => s.Data.ExcludedEncountersAboveMedian > 0);
            await VerifySummaries(summaries);
        }

        private FilterChipItem CreateDischargeDateFilter() => new()
        {
            ChipType = ChipType.DateRange,
            Filters = [],
            DateRange = [new DateTime(2024, 1, 1), new DateTime(2025, 1, 1)]
        };

        private FilterChipItem CreateBooleanFilter(ChipKey key)
        {
            if (key is ChipKey.Mortality)
            {
                return new FilterChipItem
                {
                    ChipType = ChipType.Boolean,
                    GlobalId = "Mortality",
                    IsSelected = true, // determines true/false of filter
                    Key = ChipKey.Mortality,
                    Operator = OperatorType.In,
                    Filters = new List<TreeNode>()
                {
                    new TreeNode
                    {
                         DisplayText = "Yes"
                    }},
                };
            }

            throw new ArgumentException($"Unsupported boolean filter: {key}", nameof(key));
        }

        private ExplorationInfo CreateExplorationInfo(FilterChipItem? additionalFilter = null, ExclusionCriteria? exclusion = null)
        {
            var dischargeDateFilter = CreateDischargeDateFilter();
            var filterChipItems = additionalFilter != null ?
                new List<FilterChipItem> { dischargeDateFilter, additionalFilter }
                : new List<FilterChipItem> { dischargeDateFilter };

            return new ExplorationInfo
            {
                ConfigurationGuid = _configurationGuid,
                ExclusionCriteria = exclusion ?? new ExclusionCriteria(),
                Filters = new Biz.Exploration.Filters.Filter
                {
                    DischargeDateStart = dischargeDateFilter.DateRange.First(),
                    DischargeDateEnd = dischargeDateFilter.DateRange.Last(),
                    FilterChipItems = filterChipItems
                }
            };
        }

        private async Task AssertExclusionsWereApplied(IEnumerable<CaseTypeFamilySummaryData> summaries)
        {
            summaries.Should().HaveCount(_totalCaseTypeFamilyCount);
            summaries.Should().Contain(s => s.Data.ExcludedEncountersAboveMedian > 0);
        }

        private Task VerifySummaries(IEnumerable<CaseTypeFamilySummaryData> summaries)
        {
            summaries.Should().NotBeNull().And.NotBeEmpty();
            summaries.Should().OnlyContain(s => !string.IsNullOrWhiteSpace(s.Key));
            summaries.Should().OnlyContain(s => !string.IsNullOrWhiteSpace(s.Name));
            summaries.Should().AllSatisfy(s => s.Key.Should().MatchRegex(@"^\d+-\d+$", "Key should follow format 'level-id'"));
            summaries.Should().AllSatisfy(s => s.Data.Should().NotBeNull("Each summary should have data"));
            summaries.Should().AllSatisfy(s => s.Data.Key.Should().MatchRegex(@"^\d+-\d+$", "Key should follow format 'level-id'"));
            summaries.Should().AllSatisfy(s => s.Data.Id.Should().BeGreaterThan(0, "Each summary data should have a valid ID"));
            summaries.Should().AllSatisfy(s => s.Data.TotalEncounters.Should().BeGreaterThanOrEqualTo(0, "Each summary data should have a valid TotalEncounters"));
            summaries.Should().AllSatisfy(s => s.Data.TotalVariationEncounters.Should().BeGreaterThanOrEqualTo(0, "Each summary data should have a valid TotalVariationEncounters"));
            summaries.Should().AllSatisfy(s => s.Data.IncludedEncounterCount.Should().BeGreaterThanOrEqualTo(0, "Each summary data should have a valid IncludedEncounterCount"));
            summaries.Should().AllSatisfy(s => s.Data.IdentifiedVariation.Should().BeGreaterThanOrEqualTo(0, "Each summary data should have a valid IdentifiedVariation"));
            summaries.Should().AllSatisfy(s => s.Data.MortalityRate.Should().BeInRange(0, 1, "MortalityRate should be between 0 and 1"));
            summaries.Should().AllSatisfy(s => s.Data.MedianLos.Should().BeGreaterOrEqualTo(0, "MedianLos should be non-negative"));
            summaries.Should().AllSatisfy(s => s.Data.MedianCost.Should().BeGreaterOrEqualTo(0, "MedianCost should be non-negative"));
            summaries.Should().AllSatisfy(s => s.Data.IncludedEncountersBelowMedian.Should().BeGreaterOrEqualTo(0, "IncludedEncountersBelowMedian should be non-negative"));
            summaries.Should().AllSatisfy(s => s.Data.IncludedEncountersAboveMedian.Should().BeGreaterOrEqualTo(0, "IncludedEncountersAboveMedian should be non-negative"));
            summaries.Should().AllSatisfy(s => s.Data.IncludedVariation.Should().BeGreaterOrEqualTo(0, "IncludedVariation should be non-negative"));
            return Verify(summaries, verifySettings)
               .UseDirectory("Exploration")
               .UseFileName(TestContext.CurrentContext.TestName());
        }

        private async Task RunExclusionSummaryTests(ExclusionCriteria exclusions)
        {
            // act
            var explorationInfo = CreateExplorationInfo(null, exclusions);
            var summaries = await ExplorationService.GetCaseTypeFamilySummariesAsync(explorationInfo, CancellationToken.None);

            // assert
            await AssertExclusionsWereApplied(summaries);
            await VerifySummaries(summaries);
        }

        private static IEnumerable<TestCaseData> ExclusionCriteriaTestCases()
        {
            yield return new TestCaseData(
                 new ExclusionCriteria
                 {
                     CostExclusionType = ExclusionCriteriaType.Mad,
                     CostExclusionValue = 2,
                     LosExclusionType = ExclusionCriteriaType.Mad,
                     LosExclusionValue = 2
                 }
            ).SetName("GetCaseTypeFamilySummaries_WithMADExclusions_ReturnsWithExclusions");

            yield return new TestCaseData(
                new ExclusionCriteria
                {
                    CostExclusionType = ExclusionCriteriaType.Iqr,
                    CostExclusionValue = 1.5,
                    LosExclusionType = ExclusionCriteriaType.Iqr,
                    LosExclusionValue = 1.5
                }
            ).SetName("GetCaseTypeFamilySummaries_WithIQRExclusions_ReturnsWithExclusions");
        }
    }
}