using System.Collections.Concurrent;

namespace backend.DeviceHub;

public class DeviceRegistry
{
    private readonly ConcurrentDictionary<Guid, ActiveDevice> _online = new();

    public bool TryRegister(ActiveDevice dev)
        => _online.TryAdd(dev.DeviceId, dev);

    public bool Unregister(Guid deviceId)
        => _online.TryRemove(deviceId, out _);

    public ActiveDevice? Get(Guid deviceId)
        => _online.TryGetValue(deviceId, out var d) ? d : null;

    public bool IsOnline(Guid deviceId) => _online.ContainsKey(deviceId);

    public int OnlineCount => _online.Count;
}