using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using StellaOps.AirGap.Controller.Domain;
using StellaOps.AirGap.Controller.Options;
using StellaOps.AirGap.Controller.Services;
using StellaOps.AirGap.Time.Models;
using Xunit;
using OptionsFactory = Microsoft.Extensions.Options.Options;

using StellaOps.TestKit;

namespace StellaOps.AirGap.Controller.Tests;

public sealed class AirGapTelemetryTests
{
    private static readonly DateTimeOffset FixedNow = new(2025, 12, 12, 10, 0, 0, TimeSpan.Zero);

    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public void Evicts_oldest_tenants_when_over_limit()
    {
        var options = OptionsFactory.Create(new AirGapTelemetryOptions { MaxTenantEntries = 2 });
        var telemetry = new AirGapTelemetry(options, NullLogger<AirGapTelemetry>.Instance);

        telemetry.RecordStatus("tenant-1", BuildStatus("tenant-1"));
        telemetry.RecordStatus("tenant-2", BuildStatus("tenant-2"));
        telemetry.RecordStatus("tenant-3", BuildStatus("tenant-3"));

        Assert.Equal(2, telemetry.TenantCacheCount);
    }

    private static AirGapStatus BuildStatus(string tenantId)
    {
        var state = new AirGapState
        {
            TenantId = tenantId,
            Sealed = true,
            PolicyHash = "policy",
            TimeAnchor = TimeAnchor.Unknown,
            StalenessBudget = StalenessBudget.Default,
            LastTransitionAt = FixedNow
        };

        var empty = new Dictionary<string, StalenessEvaluation>(StringComparer.OrdinalIgnoreCase);
        return new AirGapStatus(state, StalenessEvaluation.Unknown, empty, FixedNow);
    }
}