using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using LessokajiWeaverUtilities.Utilities;
using Newtonsoft.Json;
using SimpleCore;
using SimpleCore.Library;
using SimpleLite.RCS;
using StandardScene.Signal.Logic;
using StandardScene.Signal.Model;
using StandardScene.Signal.Plc;
using StandardScene.Signal.Ui;
using StandardScene.Utils;

namespace StandardScene.Signal
{
    /// <summary>
    /// 第三方信号交互进程：PLC Worker（200ms）+ 扫车握手（1s）。
    /// </summary>
    [MissionType(Name = "信号交互进程", editor = typeof(SignalInteractMission))]
    [I18N.DocumentTranslation(Name = "Signal Interact Mission", locale = "en")]
    public class SignalInteractMission : Mission
    {
        [FieldMember] public int TickMs = 1000;

        [FieldMember] public int PlcPollMs = 200;

        [FieldMember] public string PlcVersion = "S7_1500";

        [FieldMember] public int PlcPort = 102;

        [FieldMember] public int PlcSlot = 1;

        [FieldMember] public string StationsPath = @"Config\Signal\stations.json";

        [FieldMember] public string ReleasePointsPath = @"Config\Signal\release-points.json";

        [FieldMember] public string HandshakePointsPath = @"Config\Signal\handshake-points.json";

        [JsonIgnore] private bool _started;
        [JsonIgnore] private readonly object _workerLock = new object();
        [JsonIgnore] private readonly List<PlcStationWorker> _workers = new List<PlcStationWorker>();
        [JsonIgnore] private CarScanWorker _scan;
        [JsonIgnore] private int _statusTick;

        public class SignalInteractMissionStatus : MissionStatus
        {
            public int StationCount { get; set; }
            public int ConnectedCount { get; set; }
            public int ReleasePointCount { get; set; }
            public int HandshakePointCount { get; set; }
            public int ScanTickCount { get; set; }
            public string StationsFile { get; set; }
            public string ReleasePointsFile { get; set; }
            public string HandshakePointsFile { get; set; }
            public List<PlcStationSnapshot> Stations { get; set; } = new List<PlcStationSnapshot>();
        }

        public override MissionStatus status { get; set; } = new SignalInteractMissionStatus();

        public static Mission Create() => new SignalInteractMission();

        [MethodMember(Name = "启动进程", Description = "加载配置，启动 PLC Worker 与扫车握手")]
        public override void Execute()
        {
            try
            {
                ReloadConfig();
                _started = true;
                RestartWorkers();
                RestartScan();
                var st = (SignalInteractMissionStatus)status;
                Diagnosis.Post(
                    $"信号交互进程已启动，机构={st.StationCount}，握手点={st.HandshakePointCount}，放行点={st.ReleasePointCount}",
                    "Signal", true);
            }
            catch (Exception ex)
            {
                status.status = "启动失败";
                Diagnosis.Post($"信号交互进程启动失败：{ExceptionFormatter.FormatEx(ex)}", "Signal", true);
                throw;
            }
        }

        [MethodMember(Name = "重新加载配置", Description = "重新读取 JSON；若进程已启动则重启 Worker/扫车")]
        public void ReloadConfig()
        {
            var stationsFile = SignalConfigStore.Resolve(StationsPath);
            var releaseFile = SignalConfigStore.Resolve(ReleasePointsPath);
            var handshakeFile = SignalConfigStore.Resolve(HandshakePointsPath);
            var stations = SignalConfigStore.Load<PlcStationModel>(stationsFile);
            var points = SignalConfigStore.Load<ReleasePointModel>(releaseFile);
            var handshake = SignalConfigStore.Load<HandshakePointModel>(handshakeFile);

            var st = (SignalInteractMissionStatus)status;
            st.StationCount = stations.Count;
            st.ReleasePointCount = points.Count;
            st.HandshakePointCount = handshake.Count;
            st.StationsFile = stationsFile;
            st.ReleasePointsFile = releaseFile;
            st.HandshakePointsFile = handshakeFile;
            st.Stations = stations.Select(s => new PlcStationSnapshot { JgName = s.JgName }).ToList();
            status.status = _started ? "运行中" : "配置已加载";
            Diagnosis.Post(
                $"信号配置已加载：机构 {stations.Count}；握手点 {handshake.Count} @ {handshakeFile}；放行点 {points.Count} @ {releaseFile}",
                "Signal", true);

            if (_started)
            {
                RestartWorkers();
                _scan?.ReplaceConfig(handshake, points);
            }
        }

        [MethodMember(Name = "停止进程")]
        public new void Stop()
        {
            _started = false;
            try { _scan?.Stop(); }
            catch { }
            _scan = null;
            StopWorkers();
            status.status = "已停止";
            Diagnosis.Post("信号交互进程已停止", "Signal", true);
        }

        [MethodMember(Name = "打开机构列表", Description = "按 PlcStationModel 增删改机构配置")]
        public void OpenStations()
        {
            try
            {
                var path = SignalConfigStore.Resolve(StationsPath);
                ModelListPanel<PlcStationModel>.Open("PLC 机构配置", path, x => x?.JgName ?? "");
            }
            catch (Exception ex)
            {
                CycleUiHelper.Alert("错误", $"打开机构列表失败：{ex.Message}");
            }
        }

        [MethodMember(Name = "打开握手点列表", Description = "按站点配置 JGControl / PointControl / TimedCharging / RateFlowControl")]
        public void OpenHandshakePoints()
        {
            try
            {
                var path = SignalConfigStore.Resolve(HandshakePointsPath);
                ModelListPanel<HandshakePointModel>.Open(
                    "握手点配置",
                    path,
                    x => x == null ? "" : $"{x.Sit} {x.SignalType}");
            }
            catch (Exception ex)
            {
                CycleUiHelper.Alert("错误", $"打开握手点列表失败：{ex.Message}");
            }
        }

        [MethodMember(Name = "打开放行点列表", Description = "按 ReleasePointModel 增删改放行点")]
        public void OpenReleasePoints()
        {
            try
            {
                var path = SignalConfigStore.Resolve(ReleasePointsPath);
                ModelListPanel<ReleasePointModel>.Open("放行点配置", path, x => x == null ? "" : x.Sit.ToString());
            }
            catch (Exception ex)
            {
                CycleUiHelper.Alert("错误", $"打开放行点列表失败：{ex.Message}");
            }
        }

        internal IReadOnlyList<PlcStationRuntime> Runtimes
        {
            get
            {
                lock (_workerLock)
                    return _workers.Select(w => w.Runtime).ToList();
            }
        }

        private void RestartScan()
        {
            try { _scan?.Stop(); }
            catch { }

            var handshake = SignalConfigStore.Load<HandshakePointModel>(SignalConfigStore.Resolve(HandshakePointsPath));
            var release = SignalConfigStore.Load<ReleasePointModel>(SignalConfigStore.Resolve(ReleasePointsPath));
            _scan = new CarScanWorker(() => Runtimes, TickMs);
            _scan.ReplaceConfig(handshake, release);
            _scan.Start();
        }

        private void RestartWorkers()
        {
            StopWorkers();
            var stationsFile = SignalConfigStore.Resolve(StationsPath);
            var stations = SignalConfigStore.Load<PlcStationModel>(stationsFile)
                .Where(s => !string.IsNullOrWhiteSpace(s.JgName))
                .ToList();

            var created = new List<PlcStationWorker>();
            lock (_workerLock)
            {
                foreach (var station in stations)
                {
                    var port = station.Port > 0 ? station.Port : PlcPort;
                    var runtime = new PlcStationRuntime(station);
                    var session = new SiemensPlcSession(PlcVersion, station.Ip, port, PlcSlot);
                    var worker = new PlcStationWorker(runtime, session, PlcPollMs, RefreshStatus);
                    _workers.Add(worker);
                    created.Add(worker);
                }
            }

            foreach (var worker in created)
                worker.Start();

            PushStatus();
        }

        private void StopWorkers()
        {
            List<PlcStationWorker> copy;
            lock (_workerLock)
            {
                copy = _workers.ToList();
                _workers.Clear();
            }

            foreach (var w in copy)
            {
                try { w.Stop(); }
                catch { }
            }
        }

        private void RefreshStatus()
        {
            if (Interlocked.Increment(ref _statusTick) % 5 != 0)
                return;
            PushStatus();
        }

        private void PushStatus()
        {
            List<PlcStationSnapshot> snaps;
            lock (_workerLock)
                snaps = _workers.Select(w => w.Runtime.ToSnapshot()).ToList();

            var st = (SignalInteractMissionStatus)status;
            st.Stations = snaps;
            st.ConnectedCount = snaps.Count(s => s.IsConnected);
            st.StationCount = snaps.Count;
            st.ScanTickCount = _scan?.TickCount ?? 0;
            if (_started)
                status.status = $"运行中 {st.ConnectedCount}/{st.StationCount} 已连接 扫车{_scan?.TickCount ?? 0}";
        }
    }
}