using Xunit;

namespace ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.IntegrationTests;

/// <summary>
///     Opt-in gate for every integration test that WRITES to the endpoint under test. A write test runs only
///     when <c>AB_SERVER_ALLOW_WRITES=1</c>, in addition to its own reachability / profile conditions, so
///     pointing an endpoint variable at a real controller (a production press in Task 21) can never write to
///     it by accident. It also refuses while <c>AB_DIFF_ENDPOINT</c> is set, because that variable means a
///     read-only differential run is in progress. The ab_server / simulator runs set the opt-in explicitly.
/// </summary>
public static class IntegrationWriteGate
{
    public const string AllowWritesVar = "AB_SERVER_ALLOW_WRITES";
    public const string DifferentialEndpointVar = "AB_DIFF_ENDPOINT";

    /// <summary>Skips the calling test unless writes are explicitly allowed for this run.</summary>
    public static void SkipUnlessWritesAllowed()
    {
        if (Environment.GetEnvironmentVariable(DifferentialEndpointVar) is { Length: > 0 })
            Assert.Skip($"Write test refused: {DifferentialEndpointVar} is set, so a read-only differential run is in progress.");
        if (Environment.GetEnvironmentVariable(AllowWritesVar) != "1")
            Assert.Skip($"Write test: set {AllowWritesVar}=1 to allow writes to the endpoint under test " +
                        "(simulator runs only — never a production controller).");
    }
}