namespace ZB.MOM.WW.OtOpcUa.Core.Scripting.Protocol;

/// <summary>
///     The environment variables the host sets on a ScriptWorker (design §6). The nonce travels in the environment,
///     never on the command line (mxaccessgw <c>WorkerBootstrap.md</c>): a command line is world-readable on most
///     systems.
/// </summary>
public static class ScriptWorkerEnvironment
{
    /// <summary>The pipe name the worker connects to.</summary>
    public const string PipeName = "OTOPCUA_SCRIPTWORKER_PIPE";

    /// <summary>The one-time launch nonce the worker must echo in <c>Ready</c>.</summary>
    public const string Nonce = "OTOPCUA_SCRIPTWORKER_NONCE";

    /// <summary>The host's process id; the worker exits when it disappears.</summary>
    public const string ParentPid = "OTOPCUA_SCRIPTWORKER_PARENT_PID";

    /// <summary>The worker's shard label, for its own diagnostics.</summary>
    public const string Shard = "OTOPCUA_SCRIPTWORKER_SHARD";

    /// <summary>
    ///     Exit code of a worker whose pipe reached end of stream (the host went away). Distinct from a crash so the
    ///     host's exit reason metric can tell them apart.
    /// </summary>
    public const int ExitPipeClosed = 3;

    /// <summary>Exit code of a worker whose handshake or framing failed.</summary>
    public const int ExitProtocolFault = 4;

    /// <summary>Exit code of a worker whose parent process disappeared.</summary>
    public const int ExitParentGone = 5;

    /// <summary>Exit code of a worker that found a forbidden assembly loaded in itself.</summary>
    public const int ExitForbiddenAssembly = 6;

    /// <summary>
    ///     Assembly-name prefixes that must never be loaded in a worker (design §6): the host's cluster, database,
    ///     OPC UA and secrets stacks. The worker checks itself against this list and exits if it finds one.
    /// </summary>
    public static readonly IReadOnlyList<string> ForbiddenAssemblyPrefixes =
    [
        "Akka",
        "Microsoft.Data.SqlClient",
        "System.Data.SqlClient",
        "Microsoft.EntityFrameworkCore",
        "Opc.Ua",
        "ZB.MOM.WW.Secrets",
        "ZB.MOM.WW.OtOpcUa.Runtime",
        "ZB.MOM.WW.OtOpcUa.Host",
        "ZB.MOM.WW.OtOpcUa.Driver.",
        "Grpc.",
    ];
}