using NSubstitute;
using ScadaLink.CentralUI.Services;
using ScadaLink.Commons.Entities.Audit;
using ScadaLink.Commons.Interfaces.Repositories;
using ScadaLink.Commons.Types.Audit;
using ScadaLink.Commons.Types.Enums;

namespace ScadaLink.CentralUI.Tests.Services;

/// <summary>
/// Service-level tests for <see cref="AuditLogQueryService"/> (#23 M7-T3). The
/// service is a thin pass-through over <see cref="IAuditLogRepository.QueryAsync"/>;
/// these tests pin the filter forwarding contract and the 100-row default-page-size
/// rule the grid relies on.
/// </summary>
public class AuditLogQueryServiceTests
{
    [Fact]
    public async Task QueryAsync_ForwardsFilterAndPaging_ToRepository()
    {
        var repo = Substitute.For<IAuditLogRepository>();
        var filter = new AuditLogQueryFilter(Channel: AuditChannel.ApiOutbound);
        var paging = new AuditLogPaging(PageSize: 25);
        var expected = new List<AuditEvent>
        {
            new() { EventId = Guid.NewGuid(), OccurredAtUtc = DateTime.UtcNow, Channel = AuditChannel.ApiOutbound, Kind = AuditKind.ApiCall, Status = AuditStatus.Delivered }
        };
        repo.QueryAsync(filter, paging, Arg.Any<CancellationToken>())
            .Returns(Task.FromResult<IReadOnlyList<AuditEvent>>(expected));

        var sut = new AuditLogQueryService(repo);

        var result = await sut.QueryAsync(filter, paging);

        Assert.Same(expected, result);
        await repo.Received(1).QueryAsync(filter, paging, Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task QueryAsync_AppliesDefaultPageSize_WhenNotSpecified()
    {
        var repo = Substitute.For<IAuditLogRepository>();
        AuditLogPaging? observed = null;
        repo.QueryAsync(Arg.Any<AuditLogQueryFilter>(), Arg.Do<AuditLogPaging>(p => observed = p), Arg.Any<CancellationToken>())
            .Returns(Task.FromResult<IReadOnlyList<AuditEvent>>(Array.Empty<AuditEvent>()));

        var sut = new AuditLogQueryService(repo);

        await sut.QueryAsync(new AuditLogQueryFilter(), paging: null);

        Assert.NotNull(observed);
        Assert.Equal(sut.DefaultPageSize, observed!.PageSize);
        Assert.Equal(100, sut.DefaultPageSize);
        Assert.Null(observed.AfterOccurredAtUtc);
        Assert.Null(observed.AfterEventId);
    }
}