using FluentAssertions;
using Marathon.Application.Abstractions;
using Marathon.Application.UseCases;
using Marathon.Domain.Entities;
using Marathon.Domain.Enums;
using Marathon.Domain.ValueObjects;
using Microsoft.Extensions.Logging.Abstractions;
using NSubstitute;
using NSubstitute.ExceptionExtensions;

namespace Marathon.Application.Tests.UseCases;

public sealed class PullLiveOddsUseCaseTests
{
    private readonly IOddsScraper _scraper = Substitute.For<IOddsScraper>();
    private readonly IEventRepository _eventRepo = Substitute.For<IEventRepository>();
    private readonly ISnapshotRepository _snapshotRepo = Substitute.For<ISnapshotRepository>();

    private PullLiveOddsUseCase CreateSut() =>
        new(_scraper, _eventRepo, _snapshotRepo,
            TestFixtures.Throttle(),
            NullLogger<PullLiveOddsUseCase>.Instance);

    [Fact]
    public async Task Should_CaptureOneSnapshotPerEvent_When_LiveListingReturnsTwoEvents()
    {
        // Arrange: 2 events from the live listing; both already known to the DB
        var ev1 = TestFixtures.MakeEvent("11111111");
        var ev2 = TestFixtures.MakeEvent("22222222");
        var live = new List<Event> { ev1, ev2 }.AsReadOnly();

        _scraper.ScrapeLiveAsync(Arg.Any<CancellationToken>()).Returns(live);
        _eventRepo.GetAsync(ev1.Id, Arg.Any<CancellationToken>()).Returns(ev1);
        _eventRepo.GetAsync(ev2.Id, Arg.Any<CancellationToken>()).Returns(ev2);

        _scraper.ScrapeEventOddsAsync(
                Arg.Is<Event>(e => e.Id == ev1.Id), OddsSource.Live, Arg.Any<CancellationToken>())
            .Returns(TestFixtures.MakeSnapshot(ev1.Id, OddsSource.Live));
        _scraper.ScrapeEventOddsAsync(
                Arg.Is<Event>(e => e.Id == ev2.Id), OddsSource.Live, Arg.Any<CancellationToken>())
            .Returns(TestFixtures.MakeSnapshot(ev2.Id, OddsSource.Live));

        var sut = CreateSut();

        // Act
        var snapshotsCaptured = await sut.ExecuteAsync(CancellationToken.None);

        // Assert
        snapshotsCaptured.Should().Be(2);

        await _eventRepo.DidNotReceive().AddAsync(Arg.Any<Event>(), Arg.Any<CancellationToken>());
        await _snapshotRepo.Received(2).AddAsync(Arg.Any<OddsSnapshot>(), Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Should_PersistNewLiveEvent_When_NotYetInDatabase()
    {
        // Arrange: live listing returns one event the DB has never seen
        var live = TestFixtures.MakeEvent("99999999");
        _scraper.ScrapeLiveAsync(Arg.Any<CancellationToken>())
            .Returns(new List<Event> { live }.AsReadOnly());
        _eventRepo.GetAsync(live.Id, Arg.Any<CancellationToken>()).Returns((Event?)null);
        _scraper.ScrapeEventOddsAsync(
                Arg.Is<Event>(e => e.Id == live.Id), OddsSource.Live, Arg.Any<CancellationToken>())
            .Returns(TestFixtures.MakeSnapshot(live.Id, OddsSource.Live));

        var sut = CreateSut();

        // Act
        var snapshotsCaptured = await sut.ExecuteAsync(CancellationToken.None);

        // Assert
        snapshotsCaptured.Should().Be(1);
        await _eventRepo.Received(1).AddAsync(live, Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Should_ContinueAfterSnapshotFailure_And_NotPropagateException()
    {
        // Arrange: 2 live events — scraping the first throws
        var ev1 = TestFixtures.MakeEvent("11111111");
        var ev2 = TestFixtures.MakeEvent("22222222");
        _scraper.ScrapeLiveAsync(Arg.Any<CancellationToken>())
            .Returns(new List<Event> { ev1, ev2 }.AsReadOnly());
        _eventRepo.GetAsync(ev1.Id, Arg.Any<CancellationToken>()).Returns(ev1);
        _eventRepo.GetAsync(ev2.Id, Arg.Any<CancellationToken>()).Returns(ev2);

        _scraper.ScrapeEventOddsAsync(
                Arg.Is<Event>(e => e.Id == ev1.Id), OddsSource.Live, Arg.Any<CancellationToken>())
            .ThrowsAsync(new HttpRequestException("timeout"));
        _scraper.ScrapeEventOddsAsync(
                Arg.Is<Event>(e => e.Id == ev2.Id), OddsSource.Live, Arg.Any<CancellationToken>())
            .Returns(TestFixtures.MakeSnapshot(ev2.Id, OddsSource.Live));

        var sut = CreateSut();

        // Act — must not throw
        var act = async () => await sut.ExecuteAsync(CancellationToken.None);
        await act.Should().NotThrowAsync();

        // Re-execute to assert the count (mocks are still primed)
        var result = await sut.ExecuteAsync(CancellationToken.None);
        result.Should().Be(1, "only ev2 succeeded; ev1 failed silently");
    }

    [Fact]
    public async Task Should_ReturnZero_When_LiveListingIsEmpty()
    {
        _scraper.ScrapeLiveAsync(Arg.Any<CancellationToken>())
            .Returns(Array.Empty<Event>());

        var sut = CreateSut();

        var result = await sut.ExecuteAsync(CancellationToken.None);

        result.Should().Be(0);
        await _scraper.DidNotReceive()
            .ScrapeEventOddsAsync(Arg.Any<Event>(), Arg.Any<OddsSource>(), Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Should_ReturnZeroAndSwallow_When_LiveListingFetchThrows()
    {
        _scraper.ScrapeLiveAsync(Arg.Any<CancellationToken>())
            .ThrowsAsync(new HttpRequestException("listing unavailable"));

        var sut = CreateSut();

        var result = await sut.ExecuteAsync(CancellationToken.None);

        result.Should().Be(0);
        await _scraper.DidNotReceive()
            .ScrapeEventOddsAsync(Arg.Any<Event>(), Arg.Any<OddsSource>(), Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Should_BackfillEventPath_When_ExistingRowMissedIt()
    {
        // Arrange: DB row pre-dates the EventPath column (EventPath = null);
        // live listing supplies a path.
        var withoutPath = TestFixtures.MakeEvent("55555555");
        var withPath    = withoutPath with { EventPath = "Football/Some+Path/Team+vs+Team+-+99" };

        _scraper.ScrapeLiveAsync(Arg.Any<CancellationToken>())
            .Returns(new List<Event> { withPath }.AsReadOnly());
        _eventRepo.GetAsync(withPath.Id, Arg.Any<CancellationToken>()).Returns(withoutPath);

        _scraper.ScrapeEventOddsAsync(
                Arg.Is<Event>(e => e.EventPath == withPath.EventPath),
                OddsSource.Live, Arg.Any<CancellationToken>())
            .Returns(TestFixtures.MakeSnapshot(withPath.Id, OddsSource.Live));

        var sut = CreateSut();

        // Act
        var result = await sut.ExecuteAsync(CancellationToken.None);

        // Assert — the DB row was updated with the new path before scraping odds
        result.Should().Be(1);
        await _eventRepo.Received(1).UpdateAsync(
            Arg.Is<Event>(e => e.Id == withPath.Id && e.EventPath == withPath.EventPath),
            Arg.Any<CancellationToken>());
    }
}