using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using OpenTelemetry;
using OpenTelemetry.Trace;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Cluster;
using ZB.MOM.WW.OtOpcUa.Host.Observability;
using ZB.MOM.WW.Telemetry;

namespace ZB.MOM.WW.OtOpcUa.Host.IntegrationTests;

/// <summary>
///     scadaproj#55 — the OTel Resource carries <c>site.id</c> (the node's application Cluster id),
///     <c>node.role</c> (its plain roles) and <c>service.version</c> (entry-assembly default), so two
///     OtOpcUa nodes are distinguishable by more than <c>service.instance.id</c>.
/// </summary>
public sealed class ObservabilityResourceIdentityTests
{
    private static IConfiguration EmptyConfig() => new ConfigurationBuilder().Build();

    [Fact]
    public void FusedNode_ReportsClusterIdAndCanonicalRoles()
    {
        var roles = EffectiveRoles.Resolve(["driver", "cluster-SITE-A", "admin"], envRoles: null);
        var o = new ZbTelemetryOptions();

        ObservabilityExtensions.ConfigureTelemetry(o, EmptyConfig(), roles);

        o.SiteId.ShouldBe("SITE-A");
        o.NodeRole.ShouldBe("admin,driver");
        o.ServiceVersion.ShouldBeNull(); // null = the library's entry-assembly default
    }

    [Fact]
    public void LegacyNodeWithoutClusterRole_OmitsSiteId()
    {
        var roles = EffectiveRoles.Resolve(["driver"], envRoles: null);
        var o = new ZbTelemetryOptions();

        ObservabilityExtensions.ConfigureTelemetry(o, EmptyConfig(), roles);

        o.SiteId.ShouldBeNull();
        o.NodeRole.ShouldBe("driver");
    }

    [Fact]
    public void NoRoles_OmitsNodeRole()
    {
        ObservabilityExtensions.NodeRoleOf(EffectiveRoles.Resolve(null, null)).ShouldBeNull();
    }

    [Fact]
    public void BuiltContainer_ResourceCarriesIdentityAndVersion()
    {
        var builder = WebApplication.CreateBuilder(new WebApplicationOptions { Args = [] });
        builder.Services.AddOtOpcUaObservability(
            builder.Configuration, EffectiveRoles.Resolve(["admin", "driver", "cluster-MAIN"], null));
        using var app = builder.Build();

        var attributes = app.Services.GetRequiredService<TracerProvider>().GetResource().Attributes
            .ToDictionary(a => a.Key, a => a.Value);

        attributes["service.name"].ShouldBe("otopcua");
        attributes["site.id"].ShouldBe("MAIN");
        attributes["node.role"].ShouldBe("admin,driver");
        attributes["service.version"].ShouldBe(ZbResource.DefaultServiceVersion);
        ((string)attributes["service.version"]).ShouldNotBeNullOrWhiteSpace();
    }
}