maraphon-app/tests/Marathon.Application.Tests/UseCases/GetPendingAnomalyNotificationsUseCaseTests.cs

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;

namespace Marathon.Application.Tests.UseCases;

public sealed class GetPendingAnomalyNotificationsUseCaseTests
{
    private readonly IAnomalyRepository _anomalies = Substitute.For<IAnomalyRepository>();
    private readonly IEventRepository _events = Substitute.For<IEventRepository>();

    private static readonly TimeSpan MoscowOffset = TimeSpan.FromHours(3);
    private static readonly DateTimeOffset BaseTime = new(2026, 5, 10, 18, 0, 0, MoscowOffset);

    public GetPendingAnomalyNotificationsUseCaseTests()
    {
        // Event titles are resolved via the batched GetManyAsync; route it through
        // the per-id GetAsync stubs each test configures.
        TestFixtures.BridgeGetMany(_events);
    }

    private GetPendingAnomalyNotificationsUseCase CreateSut() =>
        new(_anomalies, _events, NullLogger<GetPendingAnomalyNotificationsUseCase>.Instance);

    private static Anomaly MakeAnomaly(EventId id, decimal score, DateTimeOffset detectedAt) =>
        new(Guid.NewGuid(), id, detectedAt, AnomalyKind.SuspensionFlip, score, "{}");

    private static Event MakeEvent(EventId id) =>
        new(id, new SportCode(11), "BY", "L1", "Cat", BaseTime, "Team A", "Team B");

    private void StubAnomalies(params Anomaly[] anomalies) =>
        _anomalies.ListByDateRangeAsync(
                Arg.Any<DateTimeOffset?>(), Arg.Any<DateTimeOffset?>(), Arg.Any<CancellationToken>())
            .Returns(anomalies.ToList().AsReadOnly());

    [Fact]
    public async Task Should_ExcludeAnomaliesBelowMinScore()
    {
        var id = new EventId("11111111");
        StubAnomalies(
            MakeAnomaly(id, 0.30m, BaseTime),
            MakeAnomaly(id, 0.70m, BaseTime.AddMinutes(1)));
        _events.GetAsync(id, Arg.Any<CancellationToken>()).Returns(MakeEvent(id));

        var result = await CreateSut().ExecuteAsync(BaseTime.AddHours(-1), minScore: 0.45m, CancellationToken.None);

        result.Should().ContainSingle();
        result[0].Score.Should().Be(0.70m);
        result[0].EventTitle.Should().Be("Team A vs Team B");
    }

    [Fact]
    public async Task Should_OrderOldestFirst()
    {
        var id1 = new EventId("11111111");
        var id2 = new EventId("22222222");
        StubAnomalies(
            MakeAnomaly(id2, 0.60m, BaseTime.AddMinutes(5)),
            MakeAnomaly(id1, 0.50m, BaseTime));
        _events.GetAsync(id1, Arg.Any<CancellationToken>()).Returns(MakeEvent(id1));
        _events.GetAsync(id2, Arg.Any<CancellationToken>()).Returns(MakeEvent(id2));

        var result = await CreateSut().ExecuteAsync(BaseTime.AddHours(-1), 0.45m, CancellationToken.None);

        result.Select(n => n.DetectedAt).Should().BeInAscendingOrder();
    }

    [Fact]
    public async Task Should_FallBackToEventId_When_EventMissing()
    {
        var id = new EventId("orphan00");
        StubAnomalies(MakeAnomaly(id, 0.55m, BaseTime));
        _events.GetAsync(id, Arg.Any<CancellationToken>()).Returns((Event?)null);

        var result = await CreateSut().ExecuteAsync(BaseTime.AddHours(-1), 0.45m, CancellationToken.None);

        result.Should().ContainSingle();
        result[0].EventTitle.Should().Be("orphan00");
    }

    [Fact]
    public async Task Should_ReturnEmpty_When_NothingQualifies()
    {
        StubAnomalies(Array.Empty<Anomaly>());

        var result = await CreateSut().ExecuteAsync(BaseTime, 0.45m, CancellationToken.None);

        result.Should().BeEmpty();
    }
}