// Copyright 2020-2025 The NATS Authors
// Licensed under the Apache License, Version 2.0

namespace ZB.MOM.NatsNet.Server.IntegrationTests.Helpers;

/// <summary>
/// Placeholder harness for a JetStream super-cluster (multiple clusters connected
/// by gateways).  The real implementation requires the full NatsServer runtime to
/// be capable of spawning in-process cluster nodes.
/// </summary>
public sealed class TestSuperCluster : IDisposable
{
    private readonly List<TestCluster> _clusters;

    private TestSuperCluster(List<TestCluster> clusters)
    {
        _clusters = clusters;
    }

    /// <summary>
    /// Creates a super-cluster with <paramref name="numClusters"/> clusters, each
    /// containing <paramref name="numPerCluster"/> servers.
    /// Not yet implemented — tests that call this will be skipped.
    /// </summary>
    public static TestSuperCluster CreateJetStreamSuperCluster(int numPerCluster, int numClusters) =>
        new([]);

    /// <summary>Returns the current JetStream meta-leader across all clusters.</summary>
    public object? Leader() => null;

    /// <summary>Returns a random server from any cluster in the super-cluster.</summary>
    public object? RandomServer() => null;

    /// <summary>Waits until a meta-leader is elected.</summary>
    public void WaitOnLeader() { /* placeholder */ }

    /// <summary>Waits until a stream leader is elected in the given account.</summary>
    public void WaitOnStreamLeader(string account, string stream) { /* placeholder */ }

    /// <summary>Returns the named cluster.</summary>
    public TestCluster ClusterForName(string name) =>
        _clusters.Single(c => c.Name == name);

    public void Dispose()
    {
        foreach (var c in _clusters)
            c.Dispose();
    }
}