using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using NSubstitute;
using ZB.MOM.WW.ScadaBridge.AuditLog.Site;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
using ZB.MOM.WW.ScadaBridge.HealthMonitoring;

namespace ZB.MOM.WW.ScadaBridge.AuditLog.Tests.Site;

/// <summary>
/// Deferred-work #21: the backlog reporter's poll cadence is configurable via
/// <see cref="SqliteAuditWriterOptions.BacklogPollIntervalSeconds"/> instead of the
/// old hard-coded 30 s constant.
/// </summary>
public class SiteAuditBacklogReporterCadenceTests
{
    private static SiteAuditBacklogReporter Create(
        IOptions<SqliteAuditWriterOptions>? options, TimeSpan? explicitInterval = null) =>
        new(
            Substitute.For<ISiteAuditQueue>(),
            Substitute.For<ISiteHealthCollector>(),
            NullLogger<SiteAuditBacklogReporter>.Instance,
            explicitInterval,
            options);

    [Fact]
    public void Cadence_ComesFromOptions_WhenConfigured()
    {
        var options = Options.Create(new SqliteAuditWriterOptions { BacklogPollIntervalSeconds = 12 });

        var reporter = Create(options);

        Assert.Equal(TimeSpan.FromSeconds(12), reporter.RefreshInterval);
    }

    [Fact]
    public void Cadence_FallsBackToDefault_WhenOptionsNonPositive()
    {
        var options = Options.Create(new SqliteAuditWriterOptions { BacklogPollIntervalSeconds = 0 });

        var reporter = Create(options);

        Assert.Equal(SiteAuditBacklogReporter.DefaultRefreshInterval, reporter.RefreshInterval);
    }

    [Fact]
    public void Cadence_FallsBackToDefault_WhenNoOptions()
    {
        var reporter = Create(options: null);

        Assert.Equal(SiteAuditBacklogReporter.DefaultRefreshInterval, reporter.RefreshInterval);
    }

    [Fact]
    public void ExplicitInterval_WinsOverOptions()
    {
        var options = Options.Create(new SqliteAuditWriterOptions { BacklogPollIntervalSeconds = 12 });

        var reporter = Create(options, explicitInterval: TimeSpan.FromSeconds(3));

        Assert.Equal(TimeSpan.FromSeconds(3), reporter.RefreshInterval);
    }
}