using ZB.MOM.WW.OtOpcUa.Commons.Types;

namespace ZB.MOM.WW.OtOpcUa.Commons.Interfaces;

/// <summary>
/// Live view of the local node's identity and the cluster's role topology. Implemented by
/// <c>ClusterRoleInfo</c> in <c>OtOpcUa.Cluster</c>; consumed by everything that needs to
/// distinguish admin-role vs driver-role members or react to role-leader changes (e.g. OPC UA
/// ServiceLevel computation).
/// </summary>
public interface IClusterRoleInfo
{
    NodeId LocalNode { get; }
    IReadOnlySet<string> LocalRoles { get; }
    bool HasRole(string role);
    IReadOnlyList<NodeId> MembersWithRole(string role);
    NodeId? RoleLeader(string role);

    event EventHandler<RoleLeaderChangedEventArgs>? RoleLeaderChanged;
}