ANTOOZA-BACKEND/Infrastructure/Hubs/CrewHubBroadcaster.cs

using Application.Abstractions.Hub;
using Microsoft.AspNetCore.SignalR;

namespace Infrastructure.Hubs;

/// <summary>
/// 크루원 변경 broadcast 구현체.
/// FeedBroadcaster 와 동일하게 IHubContext 미주입(테스트/디자인 타임) 시 silent no-op.
/// </summary>
internal sealed class CrewHubBroadcaster(IHubContext<AppHub, IAppHubClient>? hub = null) : ICrewHubBroadcaster
{
    public Task BroadcastMemberChangeAsync(int crewID, string kind, object data, CancellationToken ct = default)
    {
        if (hub is null || crewID <= 0 || string.IsNullOrWhiteSpace(kind))
        {
            return Task.CompletedTask;
        }

        return hub.Clients
            .Group($"crew:{crewID}")
            .ReceiveCrewMemberChange(new { kind, data });
    }
}