using Microsoft.Extensions.DependencyInjection;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Core.AlarmHistorian;
using ZB.MOM.WW.OtOpcUa.Runtime.Historian;

namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.Gateway.Tests;

/// <summary>
/// Alarm-write cutover seam test (T13). The Host's <c>AddAlarmHistorian</c> wiring drains the durable
/// <c>LocalDbStoreAndForwardSink</c> through this factory, so it must yield the gateway-backed writer —
/// sourcing the single gateway's connection from <see cref="ServerHistorianOptions"/> (endpoint/key/TLS),
/// not the legacy Wonderware-shaped <c>AlarmHistorian</c> host/port. Built offline: the underlying
/// channel dials lazily, so both the factory and the writer ctor perform no network I/O (a bogus,
/// unreachable endpoint must construct without throwing or connecting).
/// </summary>
public sealed class GatewayAlarmWriterFactoryTests
{
    [Fact]
    public void Factory_builds_GatewayAlarmHistorianWriter()
    {
        var opts = new ServerHistorianOptions { Enabled = true, Endpoint = "https://localhost:5222", ApiKey = "histgw_x_y" };
        using var services = new ServiceCollection().BuildServiceProvider();

        IAlarmHistorianWriter writer = GatewayHistorian.CreateAlarmWriter(opts, services);

        Assert.IsType<GatewayAlarmHistorianWriter>(writer);
    }
}
