using System;
using System.Diagnostics;
using System.Threading;
using ivf_tl_Control;                 // AppData, StartMain
using IvfTl.Control.Services;         // Log4netHelper(程序集 ivf_tl_Control_Services;切勿写 operate 端 ivf_tl_Services)

namespace IvfTl.ControlHost
{
    public static class Program
    {
        private static Mutex _singleton;
        private static ControlHttpServer _http;
        private static volatile bool _started;
        private static ManualResetEventSlim _exitEvent;

        [STAThread]
        public static int Main(string[] args)
        {
            // 1) 单实例:已有 control 在跑则立即退出(永远只有一个驱动机器)。
            bool isNew;
            _singleton = new Mutex(true, @"Global\ivf_tl_control_singleton", out isNew);
            if (!isNew)
            {
                Log4netHelper.WriteLog("ControlHost: 已有实例在运行,本进程退出");
                return 0;
            }

            try
            {
                var hostArgs = HostArgs.Parse(args);
                Log4netHelper.WriteLog($"ControlHost 启动 port={hostArgs.Port} account={hostArgs.Account}");

                // 2) 先起 HTTP(让 operate 能尽早探到"在启动中"),started=false。
                //    阶段2:/status rich + /serial/pause|resume + /shutdown。
                _http = new ControlHttpServer(
                    hostArgs.Port,
                    BuildStatus,        // /ping 轻量
                    BuildRichStatus,    // /status 完整快照(§6 三块)
                    HandleShutdown,     // /shutdown 受护栏停机
                    HandleSerialPause,  // /serial/pause 借串口让路
                    HandleSerialResume, // /serial/resume 归还恢复
                    msg => Log4netHelper.WriteLog(msg));
                _http.Start();

                // 3) 账号守卫(对齐 operate 空账号跳过逻辑)。
                if (!hostArgs.IsValid)
                {
                    Log4netHelper.WriteLog("ControlHost: 账号/密码为空,不启动采集(仅 HTTP 存活)");
                }
                else
                {
                    // 4) 启动序放后台线程(复刻 operate MainWindow 的 Task.Run 形态):
                    //    StartRun 内部会阻塞(InitTL 串口握手 + StartAsync().Wait()),不能占住主线程,
                    //    否则下面的 _exitEvent.Wait() 永不可达、阶段2 /shutdown 也无从优雅停。
                    //    主线程只负责驻留;HTTP 在独立 Task 上,采集起没起都能被 operate 探活。
                    System.Threading.Tasks.Task.Run(() => RunStartupSequence(hostArgs));
                }

                // 5) 驻留:主线程阻塞等退出信号(阶段2 的 /shutdown 会 Set 此事件)。
                _exitEvent = new ManualResetEventSlim(false);
                _exitEvent.Wait();
                return 0;
            }
            catch (Exception ex)
            {
                Log4netHelper.WriteLog("ControlHost 致命异常", ex);
                return 1;
            }
            finally
            {
                try { _http?.Stop(); } catch { }
                try { _singleton?.ReleaseMutex(); } catch { }
            }
        }

        /// <summary>
        /// control 启动序(后台线程跑,复刻 operate MainWindow 顺序,顺序不可变):
        /// Login → 设缓存盘 → HAL.ScanDevices → StartMain.StartRun。
        /// 任一步失败仅记日志降级,不退进程(HTTP 仍存活,operate 可探活到"未就绪")。
        /// </summary>
        private static void RunStartupSequence(HostArgs hostArgs)
        {
            try
            {
                if (!AppData.Instance.Login(hostArgs.Account, hostArgs.Password))
                {
                    Log4netHelper.WriteLog("ControlHost: control 登录失败");
                    return;
                }
                if (!string.IsNullOrEmpty(hostArgs.CacheDisk))
                {
                    ivf_tl_UtilHelper.PathHelper.pan = hostArgs.CacheDisk;
                    AppData.Instance.LogService.Pan = hostArgs.CacheDisk;
                }
                try
                {
                    IvfTl.Hardware.Impl.HardwareAccessLayer.Instance.Log =
                        msg => Log4netHelper.WriteLog(msg);
                    var devices = IvfTl.Hardware.Impl.HardwareAccessLayer.Instance.ScanDevices();
                    Log4netHelper.WriteLog($"ControlHost: HAL 发现 {devices.Count} 个舱");
                }
                catch (Exception hex)
                {
                    Log4netHelper.WriteLog("ControlHost: HAL 发现异常(降级):" + hex.Message);
                }

                var startMain = new StartMain();
                string err = startMain.StartRun(); // 阻塞:InitTL→InitHouse→StartAsync
                if (!string.IsNullOrEmpty(err))
                    Log4netHelper.WriteLog("ControlHost: control 启动失败:" + err);
                else
                {
                    _started = true;
                    Log4netHelper.WriteLog("ControlHost: control 启动成功,常驻运行");
                }
            }
            catch (Exception ex)
            {
                Log4netHelper.WriteLog("ControlHost: 启动序异常(降级,HTTP 仍存活)", ex);
            }
        }

        /// <summary>提供给 HTTP /status 的快照(阶段1:基础存活;阶段2 接 GetMonitorSnapshot 补全)。</summary>
        private static StatusDto BuildStatus()
        {
            string tlSn = "";
            try { tlSn = AppData.Instance.TLSetting?.tlSn ?? ""; } catch { }
            return new StatusDto
            {
                Ok = true,
                Pid = Process.GetCurrentProcess().Id,
                TlSn = tlSn,
                Started = _started
            };
        }

        /// <summary>/status 完整快照:基础存活 + control 现有 MonitorSnapshot(阶段2 §6 三块已在快照内补全)。</summary>
        private static object BuildRichStatus()
        {
            var head = BuildStatus();
            object snapshot = null;
            try { snapshot = AppData.Instance.GetMonitorSnapshot(); } catch { }
            return new
            {
                ok = head.Ok,
                pid = head.Pid,
                tlSn = head.TlSn,
                started = head.Started,
                snapshot
            };
        }

        /// <summary>/shutdown 受护栏停机:校验工程师口令(App.config engineerPwd,默认 tl13579),通过则安全停机。</summary>
        private static bool HandleShutdown(string token)
        {
            string engineerPwd = "tl13579";
            try
            {
                var cfg = System.Configuration.ConfigurationManager.AppSettings["engineerPwd"];
                if (!string.IsNullOrEmpty(cfg)) engineerPwd = cfg;
            }
            catch { }
            if (string.IsNullOrEmpty(token) || token != engineerPwd)
            {
                Log4netHelper.WriteLog("ControlHost: /shutdown 口令校验未通过,拒绝停机");
                return false;
            }
            Log4netHelper.WriteLog("ControlHost: /shutdown 口令通过,执行安全停机");
            // 异步触发,先把 HTTP 200 回给 operate,再停机退出。
            System.Threading.Tasks.Task.Run(() =>
            {
                try { System.Threading.Thread.Sleep(300); SafeShutdown(); }
                catch (Exception ex) { Log4netHelper.WriteLog("ControlHost: 停机异常", ex); _exitEvent?.Set(); }
            });
            return true;
        }

        /// <summary>统一安全停机:关相机/串口句柄(ShutdownAll)→ Set 退出事件(主线程 finally 停 HTTP+释放 Mutex)。</summary>
        private static void SafeShutdown()
        {
            try
            {
                IvfTl.Hardware.Impl.HardwareAccessLayer.Instance.ShutdownAll();
                Log4netHelper.WriteLog("ControlHost: HardwareAccessLayer.ShutdownAll 完成");
            }
            catch (Exception ex) { Log4netHelper.WriteLog("ControlHost: ShutdownAll 异常", ex); }
            _exitEvent?.Set();
        }

        /// <summary>/serial/pause 借串口:置该舱 HouseGate 暂停标志,control 采集节拍据此让路(不驱动电机)。</summary>
        private static bool HandleSerialPause(int houseSn)
        {
            try
            {
                var gate = IvfTl.Hardware.Impl.HardwareAccessLayer.Instance.GetHouseGate(houseSn);
                if (gate == null) return false;
                gate.PauseCapture();
                Log4netHelper.WriteLog($"ControlHost: /serial/pause 舱{houseSn} 已让路(暂停采集)");
                return true;
            }
            catch (Exception ex) { Log4netHelper.WriteLog($"ControlHost: /serial/pause 舱{houseSn} 异常", ex); return false; }
        }

        /// <summary>/serial/resume 归还:清该舱让路标志,恢复采集。</summary>
        private static bool HandleSerialResume(int houseSn)
        {
            try
            {
                var gate = IvfTl.Hardware.Impl.HardwareAccessLayer.Instance.GetHouseGate(houseSn);
                if (gate == null) return false;
                gate.ResumeCapture();
                Log4netHelper.WriteLog($"ControlHost: /serial/resume 舱{houseSn} 已恢复采集");
                return true;
            }
            catch (Exception ex) { Log4netHelper.WriteLog($"ControlHost: /serial/resume 舱{houseSn} 异常", ex); return false; }
        }
    }
}