using System.Collections.ObjectModel;
using System.Windows; // 如果是 WPF
using SHH.Contracts;

namespace SHH.CameraDashboard
{
    /// <summary>
    /// 服务端状态管理器
    /// <para>职责：维护在线设备列表，供 UI 绑定</para>
    /// </summary>
    public class ServerStateManager
    {
        // UI 绑定的集合
        public ObservableCollection<ServerNodeInfo> OnlineServers { get; }
            = new ObservableCollection<ServerNodeInfo>();

        /// <summary>
        /// 处理注册/心跳包，更新列表
        /// </summary>
        public void RegisterOrUpdate(ServerRegistrationDto info)
        {
            // 确保在 UI 线程执行 (WPF 必须)
            Application.Current.Dispatcher.Invoke(() =>
            {
                var existing = OnlineServers.FirstOrDefault(x => x.InstanceId == info.InstanceId);

                if (existing != null)
                {
                    // 更新已有节点状态
                    existing.IpAddress = info.ServerIp;
                    existing.WebApiPort = info.WebApiPort;
                    existing.LastHeartbeat = DateTime.Now;
                    existing.Status = "在线";
                    // 触发属性变更通知...
                }
                else
                {
                    // 新增节点
                    OnlineServers.Add(new ServerNodeInfo
                    {
                        InstanceId = info.InstanceId,
                        IpAddress = info.ServerIp,
                        WebApiPort = info.WebApiPort,
                        ProcessId = info.ProcessId,
                        LastHeartbeat = DateTime.Now,
                        Status = "在线"
                    });
                }
            });
        }
    }

    /// <summary>
    /// UI 显示用的模型
    /// </summary>
    public class ServerNodeInfo
    {
        public string InstanceId { get; set; }
        public string IpAddress { get; set; }
        public int WebApiPort { get; set; }
        public int ProcessId { get; set; }
        public string Status { get; set; }
        public DateTime LastHeartbeat { get; set; }

        // 方便 UI 显示的字符串
        public string DisplayName => $"{InstanceId} ({IpAddress}:{WebApiPort})";
    }
}