using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Newtonsoft.Json;
using TeamAAS.FlowEditor.Execution;
using TeamAAS.FlowEditor.Models;
using TeamAAS.FlowEditor.ProductModels;
using TeamAAS.FlowEngine.Execution;
using TeamAAS.Communication;
using TeamAAS;

namespace TeamAAS.FlowEditor
{
    /// <summary>
    /// 产品与流程文件的持久化管理器。
    /// 一个产品可以包含多个流程文件，当前编辑产品和实际运行产品分别维护，
    /// 以支持编辑态与运行态的切换。
    /// 相关数据模型（ProductMeta / HomeFrameItem / FrameArrangeMode / FlowMeta）
    /// 见 TeamAAS.FlowEditor.ProductModels 命名空间。
    /// </summary>
    public class ProductManager
    {
        private static ProductManager _instance;
        public static ProductManager Instance => _instance ?? (_instance = new ProductManager());

        /// <summary>
        /// 产品列表发生变化（新增/删除/重命名）时触发，供首页等订阅方刷新产品型号下拉。
        /// </summary>
        public event Action ProductListChanged;
        private void RaiseProductListChanged()
        {
            try { ProductListChanged?.Invoke(); } catch { }
        }

        /// <summary>Products 根目录（统一由 PathHelper 管理，跟随 PathHelper.Root）。</summary>
        public static string ProductsPath => PathHelper.ProductsDir;

        /// <summary>流程文件统一后缀（导入/导出与每个流程存储都用它）。</summary>
        public const string FlowExtension = ".aas";

        public string CurrentProductName { get; private set; } = "";

        private string _runProductName = "";
        public string RunProductName
        {
            get => _runProductName;
            private set => _runProductName = value;
        }

        public bool IsEditMode => CurrentProductName != RunProductName;

        /// <summary>当前编辑器外壳（切换产品时登记；FlowRunner 用它判断是否与编辑态共享流程图）</summary>
        public FlowEditorShellViewModel ActiveEditorShell { get; private set; }

        /// <summary>
        /// 编辑器切换产品时要显示的流程列表：始终从磁盘加载编辑副本。
        /// 监控模式（FlowEditorShellViewModel.IsMonitorMode=true）由 Shell 主动挂接
        /// FlowRunner.RunTabs，不再由这里隐式挂接，避免编辑态被运行态覆盖。
        /// </summary>
        private List<FlowTabItem> LoadEditorTabs(string productName)
        {
            return LoadAllFlows(productName);
        }

        public string GetProductPath(string productName) => Path.Combine(ProductsPath, productName);

        public string GetProductMetaPath(string productName) =>
            Path.Combine(ProductsPath, productName, "product.json");

        public ProductMeta LoadProductMeta(string productName)
        {
            try
            {
                var path = GetProductMetaPath(productName);
                if (File.Exists(path))
                {
                    var json = File.ReadAllText(path);
                    var meta = JsonConvert.DeserializeObject<ProductMeta>(json);
                    if (meta != null)
                    {
                        meta.Name = productName; // 目录名即产品名（防历史 json 里名称不一致）
                        meta.MigrateLegacyFrames(); // 旧版画面配置自动迁移为画面列表
                        return meta;
                    }
                }
            }
            catch { }
            return new ProductMeta { Name = productName };
        }

        public void SaveProductMeta(ProductMeta meta)
        {
            try
            {
                if (string.IsNullOrWhiteSpace(meta.Name)) return;
                var dir = Path.Combine(ProductsPath, meta.Name);
                if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);
                var path = GetProductMetaPath(meta.Name);
                // 旧版画面字段已迁移进 HomeFrames,置空避免再次触发迁移
                meta.HomeFrameCount = 0;
                meta.HomeFrameNames = "";
                meta.HomeFrameShowDot = "";
                var json = JsonConvert.SerializeObject(meta, Formatting.Indented);
                File.WriteAllText(path, json);
            }
            catch { }
        }

        public List<string> GetProductList()
        {
            var list = new List<string>();
            try
            {
                if (Directory.Exists(ProductsPath))
                {
                    list = Directory.GetDirectories(ProductsPath)
                        .Select(Path.GetFileName)
                        .OrderBy(n => n)
                        .ToList();
                }
            }
            catch { }
            return list;
        }

        public List<ProductMeta> GetProductMetaList()
        {
            var result = new List<ProductMeta>();
            try
            {
                if (Directory.Exists(ProductsPath))
                {
                    foreach (var dir in Directory.GetDirectories(ProductsPath))
                    {
                        var name = Path.GetFileName(dir);
                        var meta = LoadProductMeta(name);
                        if (meta == null) meta = new ProductMeta { Name = name };
                        result.Add(meta);
                    }
                    result = result.OrderBy(m => m.Sequence).ThenBy(m => m.Name).ToList();
                }
            }
            catch { }
            return result;
        }

        public ProductMeta GetProductBySequence(int sequence)
        {
            return GetProductMetaList().FirstOrDefault(m => m.Sequence == sequence);
        }

        public bool CreateProduct(string productName, int sequence = 0)
        {
            if (string.IsNullOrWhiteSpace(productName)) return false;
            try
            {
                string safeName = SanitizeName(productName);
                string path = Path.Combine(ProductsPath, safeName);
                if (Directory.Exists(path)) return false;
                Directory.CreateDirectory(path);

                var meta = new ProductMeta { Name = safeName, Sequence = sequence };
                SaveProductMeta(meta);
                RaiseProductListChanged();
                return true;
            }
            catch { return false; }
        }

        public bool DeleteProduct(string productName)
        {
            if (string.IsNullOrWhiteSpace(productName)) return false;
            try
            {
                string path = Path.Combine(ProductsPath, productName);
                if (!Directory.Exists(path)) return false;
                Directory.Delete(path, true);
                if (CurrentProductName == productName)
                    CurrentProductName = "";
                if (RunProductName == productName)
                    RunProductName = "";
                RaiseProductListChanged();
                return true;
            }
            catch { return false; }
        }

        public bool RenameProduct(string oldName, string newName)
        {
            if (string.IsNullOrWhiteSpace(oldName) || string.IsNullOrWhiteSpace(newName)) return false;
            try
            {
                string safeNew = SanitizeName(newName);
                string oldPath = Path.Combine(ProductsPath, oldName);
                string newPath = Path.Combine(ProductsPath, safeNew);
                if (!Directory.Exists(oldPath)) return false;
                if (Directory.Exists(newPath)) return false;
                Directory.Move(oldPath, newPath);

                var oldMeta = LoadProductMeta(oldName);
                if (oldMeta != null)
                {
                    oldMeta.Name = safeNew;
                    SaveProductMeta(oldMeta);
                }

                if (CurrentProductName == oldName)
                    CurrentProductName = safeNew;
                if (RunProductName == oldName)
                    RunProductName = safeNew;
                RaiseProductListChanged();
                return true;
            }
            catch { return false; }
        }

        public bool SetProductSequence(string productName, int sequence)
        {
            var meta = LoadProductMeta(productName);
            if (meta == null) return false;
            meta.Sequence = sequence;
            SaveProductMeta(meta);
            return true;
        }

        /// <summary>主页画面配置变化（当前产品的画面数/排列/名称被修改）通知</summary>
        public event Action HomeFrameConfigChanged;

        /// <summary>当前编辑产品的画面配置（读不到产品时返回默认值；不落盘）</summary>
        public ProductMeta GetHomeFrameConfig(string productName)
        {
            var meta = string.IsNullOrEmpty(productName) ? null : LoadProductMeta(productName);
            return meta ?? new ProductMeta { Name = productName ?? "" };
        }

        /// <summary>保存画面配置到产品并广播变化（首页按新配置重建布局）</summary>
        public bool SaveHomeFrameConfig(ProductMeta meta)
        {
            if (meta == null || string.IsNullOrWhiteSpace(meta.Name)) return false;
            SaveProductMeta(meta);
            HomeFrameConfigChanged?.Invoke();
            return true;
        }

        public List<string> GetFlowFiles(string productName)
        {
            var list = new List<string>();
            try
            {
                string path = Path.Combine(ProductsPath, productName);
                if (Directory.Exists(path))
                {
                    var flowNames = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
                    foreach (var f in Directory.GetFiles(path, "*" + FlowExtension))
                        flowNames.Add(Path.GetFileNameWithoutExtension(f));
                    list = flowNames.OrderBy(n => n).ToList();
                }
            }
            catch { }
            return list;
        }

        /// <summary>
        /// 产品流程文件的变更指纹（文件数 + 最新修改时间Ticks），用于判断运行态流程是否需要从磁盘重载，
        /// 避免高频触发时每次都反序列化。涵盖 .aas 流程文件与 flows.meta.json。
        /// </summary>
        public string GetProductFlowStamp(string productName)
        {
            try
            {
                if (string.IsNullOrWhiteSpace(productName)) return "";
                var dir = Path.Combine(ProductsPath, productName);
                if (!Directory.Exists(dir)) return "";
                long maxTicks = 0;
                int count = 0;
                foreach (var f in Directory.GetFiles(dir))
                {
                    var name = Path.GetFileName(f);
                    var ext = Path.GetExtension(f);
                    bool isFlow = ext.Equals(FlowExtension, StringComparison.OrdinalIgnoreCase);
                    bool isMeta = name.Equals("flows.meta.json", StringComparison.OrdinalIgnoreCase);
                    if (!isFlow && !isMeta) continue;
                    count++;
                    var t = File.GetLastWriteTimeUtc(f).Ticks;
                    if (t > maxTicks) maxTicks = t;
                }
                return count.ToString() + "|" + maxTicks.ToString();
            }
            catch { return ""; }
        }

        public string GetFlowMetaPath(string productName) =>
            Path.Combine(ProductsPath, productName, "flows.meta.json");

        /// <summary>
        /// 把所有流程 Tab 的元数据（触发类型/循环次数/画布尺寸）写入 flows.meta.json。
        /// 在 SaveAllFlows / SaveFlow 末尾调用，保证 Tab 属性变化能持久化。
        /// </summary>
        public void SaveFlowMetaMap(string productName, IEnumerable<FlowTabItem> tabs)
        {
            // 空产品名会让 Path.Combine(ProductsPath, "", "flows.meta.json") 退化为 Products/flows.meta.json
            // （根目录凭空多一份），必须在写文件前拦截。
            if (string.IsNullOrWhiteSpace(productName)) return;
            try
            {
                var dir = Path.Combine(ProductsPath, productName);
                if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);

                var list = new List<FlowMeta>();
                foreach (var tab in tabs ?? Enumerable.Empty<FlowTabItem>())
                {
                    var meta = new FlowMeta
                    {
                        Name = tab.Name,
                        TriggerType = (int)tab.TriggerType,
                        LoopCount = tab.LoopCount,
                        CanvasWidth = tab.CanvasWidth,
                        CanvasHeight = tab.CanvasHeight,
                        LoopIntervalMs = tab.LoopIntervalMs
                    };
                    list.Add(meta);
                    // 调试日志：记录保存时的 TriggerType 值
                    AppLogger.Info($"SaveFlowMeta: {tab.Name} TriggerType={tab.TriggerType} (int={(int)tab.TriggerType})", nameof(ProductManager));
                }
                var json = JsonConvert.SerializeObject(list, Formatting.Indented);
                File.WriteAllText(GetFlowMetaPath(productName), json);
                AppLogger.Info($"SaveFlowMeta: wrote {list.Count} entries to {GetFlowMetaPath(productName)}", nameof(ProductManager));
            }
            catch (Exception ex) { AppLogger.Error("SaveFlowMeta 异常", ex, nameof(ProductManager)); }
        }

        /// <summary>
        /// 读取 flows.meta.json，按 Name 索引返回字典。文件不存在返回空字典（兼容老产品目录）。
        /// </summary>
        public Dictionary<string, FlowMeta> LoadFlowMetaMap(string productName)
        {
            var map = new Dictionary<string, FlowMeta>(StringComparer.Ordinal);
            if (string.IsNullOrWhiteSpace(productName)) return map;   // 空名会误读 Products 根目录的残留文件
            try
            {
                var path = GetFlowMetaPath(productName);
                if (!File.Exists(path))
                {
                    AppLogger.Info($"LoadFlowMeta: 文件不存在 {path}", nameof(ProductManager));
                    return map;
                }
                var json = File.ReadAllText(path);
                var list = JsonConvert.DeserializeObject<List<FlowMeta>>(json);
                if (list != null)
                {
                    foreach (var m in list)
                    {
                        if (!string.IsNullOrEmpty(m?.Name))
                        {
                            map[m.Name] = m;
                            AppLogger.Info($"LoadFlowMeta: {m.Name} TriggerType={m.TriggerType} (int={m.TriggerType})", nameof(ProductManager));
                        }
                    }
                }
                AppLogger.Info($"LoadFlowMeta: loaded {map.Count} entries from {path}", nameof(ProductManager));
            }
            catch (Exception ex) { AppLogger.Error("LoadFlowMeta 异常", ex, nameof(ProductManager)); }
            return map;
        }

        public bool SaveFlow(string productName, FlowTabItem tab)
        {
            if (string.IsNullOrWhiteSpace(productName) || tab == null) return false;
            try
            {
                string dir = Path.Combine(ProductsPath, productName);
                if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);

                string filePath = Path.Combine(dir, tab.Name + FlowExtension);   // 统一 .aas
                bool ok = tab.EditorVm?.ExportFlow(tab.Name, filePath) ?? false;
                if (ok)
                {
                    SaveFlowMetaSingle(productName, tab); // 同步更新单条流程元数据
                }
                return ok;
            }
            catch { return false; }
        }

        /// <summary>
        /// 单条流程保存时更新其元数据：读现有 flows.meta.json，按 Name 替换/添加后写回。
        /// </summary>
        public void SaveFlowMetaSingle(string productName, FlowTabItem tab)
        {
            if (tab == null) return;
            try
            {
                var map = LoadFlowMetaMap(productName);
                map[tab.Name] = new FlowMeta
                {
                    Name = tab.Name,
                    TriggerType = (int)tab.TriggerType,
                    LoopCount = tab.LoopCount,
                    CanvasWidth = tab.CanvasWidth,
                    CanvasHeight = tab.CanvasHeight,
                    LoopIntervalMs = tab.LoopIntervalMs
                };
                var dir = Path.Combine(ProductsPath, productName);
                if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);
                var json = JsonConvert.SerializeObject(map.Values.ToList(), Formatting.Indented);
                File.WriteAllText(GetFlowMetaPath(productName), json);
            }
            catch { }
        }

        public bool SaveAllFlows(string productName, IEnumerable<FlowTabItem> tabs)
        {
            if (string.IsNullOrWhiteSpace(productName) || tabs == null) return false;
            try
            {
                string dir = Path.Combine(ProductsPath, productName);
                if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);

                var tabNames = new HashSet<string>(tabs.Select(t => t.Name), StringComparer.OrdinalIgnoreCase);
                foreach (var tab in tabs)
                {
                    string filePath = Path.Combine(dir, tab.Name + FlowExtension);   // 统一 .aas
                    tab.EditorVm?.ExportFlow(tab.Name, filePath);
                }

                // 删除磁盘上已不存在于 Tab 列表中的流程文件
                // （例如用户删掉了"流程2"后点保存，切换产品再切回来就不会复活了）
                foreach (var file in Directory.GetFiles(dir, "*" + FlowExtension))
                {
                    string name = Path.GetFileNameWithoutExtension(file);
                    if (!tabNames.Contains(name))
                    {
                        try { File.Delete(file); }
                        catch { /* 文件被占用等异常忽略，下次保存再清理 */ }
                    }
                }

                // 同步写入流程 Tab 元数据（触发类型/循环次数/画布尺寸）
                SaveFlowMetaMap(productName, tabs);
                // 同步写入该产品的全局变量快照（Product 作用域变量值）
                GlobalVariableManager.Instance.SaveSnapshot(GetGlobalVarsPath(productName));

                return true;
            }
            catch { return false; }
        }

        public FlowTabItem LoadFlow(string productName, string flowName)
            => LoadFlow(productName, flowName, null, null);

        public FlowTabItem LoadFlow(string productName, string flowName, FlowMeta meta, ResultRegistry registry = null)
        {
            if (string.IsNullOrWhiteSpace(productName) || string.IsNullOrWhiteSpace(flowName)) return null;
            try
            {
                string filePath = Path.Combine(ProductsPath, productName, flowName + FlowExtension);   // 统一 .aas
                if (!File.Exists(filePath)) return null;

                var tab = new FlowTabItem(flowName);

                // 应用磁盘上保存的 Tab 元数据（触发类型/循环次数/画布尺寸/循环间隔）；meta 为 null 时用默认值
                if (meta != null)
                {
                    tab.TriggerType = (TriggerType)meta.TriggerType;
                    tab.LoopCount = meta.LoopCount;
                    tab.CanvasWidth = meta.CanvasWidth;
                    tab.CanvasHeight = meta.CanvasHeight;
                    tab.LoopIntervalMs = meta.LoopIntervalMs;
                }

                FlowGraph result = FlowFileStore.Load(filePath);

                if (result != null && tab.EditorVm != null)
                {
                    var graph = tab.EditorVm.Graph;
                    // 绑定结果注册表：运行态=Main，编辑/调试态=Debug
                    graph.Registry = registry ?? ResultRegistry.Debug;
                    graph.Registry.ClearFlow(graph.GraphId);

                    result.GraphId = graph.GraphId;
                    result.GraphName = graph.GraphName;

                    var idMap = new Dictionary<string, string>();
                    foreach (var item in result.Nodes)
                    {
                        string oldNodeId = item.NodeId;
                        item.InitializeNode(graph.GraphId, graph.GraphName, graph.Registry);
                        if (!string.IsNullOrEmpty(oldNodeId))
                            idMap[oldNodeId] = item.NodeId;
                    }

                    if (result.Connections != null && idMap.Count > 0)
                    {
                        foreach (var conn in result.Connections)
                        {
                            if (idMap.TryGetValue(conn.SourceNodeId, out var newSrcId))
                                conn.SourceNodeId = newSrcId;
                            if (idMap.TryGetValue(conn.TargetNodeId, out var newTgtId))
                                conn.TargetNodeId = newTgtId;
                        }
                    }

                    graph.Nodes.Clear();
                    foreach (var n in result.Nodes)
                        graph.Nodes.Add(n);
                    graph.Connections.Clear();
                    foreach (var c in result.Connections)
                        graph.Connections.Add(c);

                    tab.EditorVm.GraphDataChanged?.Invoke(graph, null);
                    tab.EditorVm?.MarkClean(); // 刚加载的内容视为"已保存"状态
                }

                return tab;
            }
            catch { return null; }
        }

        public List<FlowTabItem> LoadAllFlows(string productName, ResultRegistry registry = null)
        {
            var tabs = new List<FlowTabItem>();
            var flowFiles = GetFlowFiles(productName);
            // 读一次元数据字典，按 Name 应用到对应 Tab（兼容老产品目录：无文件则全用默认值）
            var metaMap = LoadFlowMetaMap(productName);
            foreach (var flowName in flowFiles)
            {
                metaMap.TryGetValue(flowName, out var meta);
                if (meta != null)
                    AppLogger.Info($"LoadAllFlows: {flowName} 找到 meta，TriggerType={meta.TriggerType}", nameof(ProductManager));
                else
                    AppLogger.Info($"LoadAllFlows: {flowName} 未找到 meta，使用默认值", nameof(ProductManager));
                var tab = LoadFlow(productName, flowName, meta, registry);
                if (tab != null)
                {
                    AppLogger.Info($"LoadAllFlows: {flowName} 加载完成，TriggerType={tab.TriggerType}", nameof(ProductManager));
                    tabs.Add(tab);
                }
            }
            return tabs;
        }

        public string GetGlobalVarsPath(string productName) =>
            Path.Combine(ProductsPath, productName, "global_vars.json");

        /// <summary>
        /// 当前内存里的全局变量归属哪个产品。加载快照/切换产品时更新。
        /// 内存变量是进程级共享的，编辑态与运行态都可能改它，
        /// 只按 CurrentProductName 存会存错产品（例如主页已切到运行产品但编辑态还停在另一个）。
        /// </summary>
        public string GlobalVarsOwnerProduct { get; private set; } = "";

        /// <summary>
        /// 保存“当前归属产品”的全局变量快照。
        /// 产品切换前、以及设置页手动保存时调用；无归属产品时回退到编辑态当前产品。
        /// </summary>
        public bool SaveGlobalVarsForOwner()
        {
            var owner = !string.IsNullOrEmpty(GlobalVarsOwnerProduct) ? GlobalVarsOwnerProduct : CurrentProductName;
            return SaveGlobalVarsFor(owner);
        }

        /// <summary>
        /// 把 Product 作用域变量保存到指定产品的快照文件(Products\<名>\global_vars.json)。
        /// 产品切换前、以及产品变量弹窗点确定时调用。
        /// </summary>
        public bool SaveGlobalVarsFor(string productName)
        {
            if (string.IsNullOrEmpty(productName)) return false;
            try
            {
                GlobalVariableManager.Instance.SaveSnapshot(GetGlobalVarsPath(productName));
                GlobalVarsOwnerProduct = productName;
                return true;
            }
            catch { return false; }
        }

        /// <summary>
        /// 从目标产品快照加载 Product 作用域变量到 GlobalVariableManager(Global 子集不受影响)。
        /// 快照不存在时清空 Product 子集(切到新产品应从空开始，而非继承上个产品的变量)。
        /// Variables 是 ObservableCollection 绑定 UI，必须在 UI 线程调用。
        /// </summary>
        public bool LoadProductGlobalVars(string productName)
        {
            if (string.IsNullOrEmpty(productName)) return false;
            try
            {
                GlobalVarsOwnerProduct = productName;
                return GlobalVariableManager.Instance.LoadSnapshot(GetGlobalVarsPath(productName));
            }
            catch { return false; }
        }

        /// <summary>
        /// 释放一组 FlowTab 持有的资源：节点插件、结果字典、图节点引用。
        /// 切换产品 / 卸载运行产品 / 清理编辑态时统一调用。
        /// 安全保证：跳过仍被 FlowRunner.RunTabs 持有的运行态 Tab——
        /// 监控模式下编辑器的 FlowTabs 挂的就是这批对象，若在此清空会导致
        /// 切换产品时正在运行的流程画布变空、主页面运行也被打断。
        /// </summary>
        internal static void DisposeFlowTabs(IEnumerable<FlowTabItem> tabs)
        {
            if (tabs == null) return;
            var runTabs = FlowRunner.Instance.RunTabs;
            foreach (var tab in tabs)
            {
                if (tab == null) continue;
                if (runTabs != null && runTabs.Contains(tab)) continue;

                // 1. 释放节点插件（相机句柄、连接流、大对象等）
                if (tab.Graph != null)
                {
                    foreach (var node in tab.Graph.Nodes)
                    {
                        try { node.PluginModel?.Dispose(); }
                        catch { /* 单个插件释放失败不影响整体 */ }
                        try
                        {
                            node.ResultItems?.Clear();
                            node.ExecutionHistory?.Clear();
                        }
                        catch { }
                    }

                    // 2. 清掉该流程绑定的 ResultRegistry 实例中本流程的全部结果
                    //    （运行态图 → Main，编辑/调试态图 → Debug，互不干扰）
                    if (!string.IsNullOrEmpty(tab.Graph.GraphId))
                        tab.Graph.Registry?.ClearFlow(tab.Graph.GraphId);

                    tab.Graph.Nodes.Clear();
                    tab.Graph.Connections.Clear();
                }

                // 3. 清 EditorVm 引用
                if (tab.EditorVm != null)
                {
                    try { tab.EditorVm.SelectedNode = null; } catch { }
                }
            }

                    // 释放完成后强制全代 GC，确保插件引用的大对象被回收
                    GC.Collect(2, GCCollectionMode.Forced, true);
                    GC.WaitForPendingFinalizers();
                    GC.Collect(2, GCCollectionMode.Forced, true);
        }

        /// <summary>
        /// 编辑模式：切换产品进行编辑（不影响主程序运行）。
        /// 注意：不再自动保存——是否保存由调用方（ProductViewModel）根据脏标记提示用户确认。
        /// </summary>
        public void SwitchProduct(string productName, FlowEditorShellViewModel shellVm)
        {
            if (shellVm == null) return;

            // 切换前：保存当前产品的全局变量快照和流程元数据
            SaveGlobalVarsForOwner();
            SaveFlowMetaMap(CurrentProductName, shellVm.FlowTabs);

            // 释放旧产品的资源（节点插件 Dispose + ResultRegistry 清理 + 图引用解除）
            DisposeFlowTabs(shellVm.FlowTabs);
            // 切换编辑产品：完全清空 Debug（含上一产品各流程与子流程残留），避免跨产品数据堆积
            ResultRegistry.Debug.ClearAllFlows();
            shellVm.FlowTabs.Clear();
            CurrentProductName = productName;
            ActiveEditorShell = shellVm;

            if (!string.IsNullOrEmpty(productName))
            {
                var flows = LoadEditorTabs(productName);
                foreach (var flow in flows)
                {
                    shellVm.FlowTabs.Add(flow);
                }
            }

            if (shellVm.FlowTabs.Count == 0)
            {
                var defaultTab = new FlowTabItem("流程1");
                shellVm.FlowTabs.Add(defaultTab);
            }

            shellVm.ActiveTab = shellVm.FlowTabs.FirstOrDefault();

            // 加载目标产品的全局变量快照（Variables 是 ObservableCollection，UI 线程同步修改）
            LoadProductGlobalVars(productName);

            // 切换产品后刷新监控选项可用性 + 自动进入/退出监控（运行产品且运行中→默认监控）
            shellVm.ApplyMonitorAvailability();
            // 强制全代 GC + 等待终结器，确保 LOH 大对象（图像/位图源/CogRecord 等）被回收
            GC.Collect(2, GCCollectionMode.Forced, true);
            GC.WaitForPendingFinalizers();
            GC.Collect(2, GCCollectionMode.Forced, true);
        }

        /// <summary>
        /// 编辑模式：切换产品（异步版）。文件 IO（加载新产品）在后台线程执行，
        /// FlowTabs 等绑定 UI 的集合变更始终留在调用线程（UI 线程）。
        /// 不自动保存；是否保存由调用方在切换前询问用户。
        /// </summary>
        public async System.Threading.Tasks.Task SwitchProductAsync(string productName, FlowEditorShellViewModel shellVm)
        {
            if (shellVm == null) return;

            // 切换前：在 UI 线程保存当前产品全局变量快照和流程元数据
            SaveGlobalVarsForOwner();
            SaveFlowMetaMap(CurrentProductName, shellVm.FlowTabs);

            // 释放旧产品的资源（节点插件 Dispose + ResultRegistry 清理 + 图引用解除）
            DisposeFlowTabs(shellVm.FlowTabs);
            // 切换编辑产品：完全清空 Debug（含上一产品各流程与子流程残留），避免跨产品数据堆积
            ResultRegistry.Debug.ClearAllFlows();
            shellVm.FlowTabs.Clear();

            // 后台线程：解析目标产品流程（始终读盘，监控挂接由 Shell 主动控制）
            List<FlowTabItem> flows = null;
            await System.Threading.Tasks.Task.Run(() =>
            {
                if (!string.IsNullOrEmpty(productName))
                    flows = LoadEditorTabs(productName);
            });

            // 调用线程（UI）：应用集合变更
            shellVm.FlowTabs.Clear();
            CurrentProductName = productName;
            ActiveEditorShell = shellVm;

            if (flows != null)
            {
                foreach (var flow in flows)
                    shellVm.FlowTabs.Add(flow);
            }

            if (shellVm.FlowTabs.Count == 0)
                shellVm.FlowTabs.Add(new FlowTabItem("流程1"));

            shellVm.ActiveTab = shellVm.FlowTabs.FirstOrDefault();

            // UI 线程：加载目标产品全局变量快照
            LoadProductGlobalVars(productName);

            // 切换产品后刷新监控选项可用性 + 自动进入/退出监控（运行产品且运行中→默认监控）
            shellVm.ApplyMonitorAvailability();
            // 强制全代 GC + 等待终结器，确保 LOH 大对象（图像/位图源/CogRecord 等）被回收
            GC.Collect(2, GCCollectionMode.Forced, true);
            GC.WaitForPendingFinalizers();
            GC.Collect(2, GCCollectionMode.Forced, true);
        }

        /// <summary>
        /// 运行模式：加载产品作为当前运行程序（从编辑显式加载）
        /// </summary>
        public void LoadProductToRun(string productName)
        {
            // 切换前先把上一个归属产品的全局变量落盘：
            // 设置页改的值只存在内存里，不先存就会随产品切换丢失
            if (!string.IsNullOrEmpty(GlobalVarsOwnerProduct) && GlobalVarsOwnerProduct != productName)
                SaveGlobalVarsForOwner();

            RunProductName = productName;
            // 主页加载运行产品：同步加载该产品的全局变量快照（与编辑模式一致）
            LoadProductGlobalVars(productName);
        }

        /// <summary>
        /// 基于序号切换产品(供外部调用，如 PLC 触发)。
        /// 产品切换经 LoadRunProduct → LoadProductGlobalVars 自动载入该产品的 Product 变量，
        /// 故此处无需再单独切换全局变量配方(配方机制已退休)。
        /// </summary>
        public bool SwitchProductBySequence(int sequence)
        {
            var meta = GetProductBySequence(sequence);
            if (meta == null) return false;

            RunProductName = meta.Name;

            // 加载为运行产品(FlowRunner 会复制一份运行态流程，不影响编辑态)
            TeamAAS.FlowEngine.Execution.FlowRunner.Instance.LoadRunProduct(meta.Name);

            return true;
        }
        private static string SanitizeName(string name)
            => TeamAAS.PathHelper.SanitizeFileName(name);
    }
}