using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using TeamAAS;
using TeamAAS.FlowEditor;
using TeamAAS.FlowEditor.Models;
using TeamAAS.FlowEditor.Plugins;
using TeamAAS.FlowEngine;
using TeamAAS.Vision;
using Plugins.Halcon.Models;

namespace Plugins.Halcon.Views
{
    /// <summary>
    /// HALCON 流程编辑器视图（UserControl）- 承载在 PluginViewDialog 中，镜像 GroupEditorView。
    /// 通过 DataContext 接收 <see cref="HalconFlowModel"/>，自动初始化子流程编辑器；
    /// 与组合模块的唯一区别：子流程编辑器工具箱作用域为 Halcon（只显示 HALCON 节点，按 VisionPlugin 分类）。
    /// 实现 IPluginRunFeedback（窗体“执行”期间同步内嵌画布运行态）、IPluginViewTip（底部提示栏 + 悬停提示）。
    ///
    /// 视觉显示（VisionMaster 风格）：右侧大显示窗 + 图层筛选 ComboBox。
    /// 节点运行后经 HalconEditorPreview.Show(model,…) → VisionLayerStore 发布图层；
    /// 本视图订阅图层总线：选中某节点（画布点选或 ComboBox 选择）即切换显示该节点当前运行批次
    /// 的图层（底图 + 多彩叠加），旧批次由 VisionLayerStore 统一淘汰释放，不叠加不泄漏。
    /// </summary>
    public partial class HalconFlowEditorView : UserControl, IPluginViewSave, IPluginRunFeedback, IPluginViewTip
    {
        private FlowEditorViewModel _vm;
        private HalconFlowModel _model;

        /// <summary>图层筛选条目（SDK）：NodeName=null=最新运行；LayerName=null=节点全部图层。</summary>
        private readonly List<LayerComboEntry> _layerEntries = new List<LayerComboEntry>();

        private bool _suppressComboSync;

        public HalconFlowEditorView()
        {
            InitializeComponent();
            // 视觉显示框注入子流程编辑器右侧面板（整区替换「节点信息」）——三个平台编辑器统一布局
            EditorRoot.Children.Remove(VisionPanel);
            SubFlowEditor.ReplaceNodeInfoPanel(VisionPanel);
            VisionPanel.Visibility = Visibility.Visible;
            Loaded += OnLoaded;
            Unloaded += OnUnloaded;
        }

        private void OnLoaded(object sender, RoutedEventArgs e)
        {
            if (DataContext is HalconFlowModel model)
            {
                _model = model;
                model.EnsureSubGraph();
                TxtTitle.Text = model.ToolName ?? "Halcon流程";

                // 关键：工具箱作用域=Halcon → 只显示 IsSubFlowNode 的 HALCON 节点，按 VisionPlugin 分组
                _vm = new FlowEditorViewModel(model.SubGraph, isSubFlowEditor: true, toolboxScope: FlowToolboxScope.Vision);
                SubFlowEditor.DataContext = _vm;
                _vm.GraphDataChanged += _vm_GraphDataChanged;
                _vm.PropertyChanged += _vm_PropertyChanged;

                // 大显示窗（注入右侧面板；图层总线是唯一显示驱动 —— 不再挂 HalconEditorPreview.Current
                // 经典通路，否则每个算子运行后都会直接推图覆盖掉用户的图层筛选结果）
                var preview = new HalconWindow(1);
                preview.SetCaption("HALCON 显示");
                DisplayHost.Content = preview;

                // 图层总线挂接：节点发布图层 → 重建筛选项 + 跟随显示
                VisionLayerStore.Instance.LayerPublished += OnLayerPublished;
                VisionLayerStore.Instance.FlowCleared += OnFlowCleared;
                ResetLayerCombo();

                // 让子节点的公式树能显示容器「输入」变量（如 &{输入.图像}）：
                // PluginDataProvider.BuildInputsNode 反射读 ParentGroupModel.ModuleInputs。
                // FlowEditorViewModel.OpenNodeEditor 在子流程编辑器内会保留容器 ParentGroupModel（见其 keepParent 逻辑）。
                PluginLoader.Instance.ParentGroupModel = model;

                HookHoverHints(this);
            }
        }

        private void OnUnloaded(object sender, RoutedEventArgs e)
        {
            PluginLoader.Instance.SetGroupPluginModel = null;
            if (ReferenceEquals(PluginLoader.Instance.ParentGroupModel, _model))
                PluginLoader.Instance.ParentGroupModel = null;

            VisionLayerStore.Instance.LayerPublished -= OnLayerPublished;
            VisionLayerStore.Instance.FlowCleared -= OnFlowCleared;

            // 移除内嵌预览窗体（图层总线为唯一显示驱动，无经典通路挂接需要清理）
            var preview = DisplayHost.Content as HalconWindow;
            DisplayHost.Content = null;
            preview?.ClearImage();
        }

        private void _vm_GraphDataChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (DataContext is HalconFlowModel model)
            {
                if (sender is FlowGraph flowGraph)
                    model.SubGraph = flowGraph;
            }
        }

        /// <summary>画布点选节点 → 图层筛选切到该节点（实时联动）。</summary>
        private void _vm_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e == null || e.PropertyName != "SelectedNode") return;
            var node = _vm?.SelectedNode;
            if (node == null || string.IsNullOrEmpty(node.NodeName)) return;

            var index = _layerEntries.FindIndex(x => x.NodeName == node.NodeName && x.LayerName == null);
            if (index < 0)
            {
                // 该节点还没有图层：回落「最新运行」，等它运行发布后再联动
                index = 0;
            }
            if (LayerCombo.SelectedIndex != index)
            {
                _suppressComboSync = true;
                LayerCombo.SelectedIndex = index;
                _suppressComboSync = false;
            }
            ApplyLayerSelection();
        }

        #region 图层筛选与显示

        /// <summary>当前选中的条目；越界/未选返回 null。</summary>
        private LayerComboEntry SelectedEntry()
        {
            var i = LayerCombo.SelectedIndex;
            if (i < 0 || i >= _layerEntries.Count) return null;
            return _layerEntries[i];
        }

        private void ResetLayerCombo()
        {
            _layerEntries.Clear();
            _layerEntries.Add(new LayerComboEntry { Display = "最新运行" });
            _suppressComboSync = true;
            LayerCombo.ItemsSource = _layerEntries.Select(e => e.Display).ToList();
            LayerCombo.SelectedIndex = 0;
            _suppressComboSync = false;
            RunStatusText.Text = "等待运行…（节点运行后自动显示其图层）";
        }

        private static System.DateTime _lastMismatchLog = System.DateTime.MinValue;

        /// <summary>图层发布回调：重建筛选项并按“值”保留选中；正在看该节点（或最新运行）时实时刷新显示。
        /// 发布的流程 Id 与编辑器不一致时（旧流程文件图 Id 漂移）不再直接丢弃 —— 记录日志并按节点名兜底显示。</summary>
        private void OnLayerPublished(LayerPublishArgs args)
        {
            if (args == null) return;
            var flowId = _model?.SubGraph?.GraphId;
            var matched = string.Equals(args.FlowId, flowId, System.StringComparison.OrdinalIgnoreCase);
            if (!matched && (System.DateTime.Now - _lastMismatchLog).TotalSeconds > 5)
            {
                _lastMismatchLog = System.DateTime.Now;
                TeamAAS.AppLogger.Warning($"图层发布流程Id与编辑器不一致: 发布={args.FlowId} 节点={args.NodeName} 编辑器期望={flowId}（已按节点名兜底显示）", "Halcon编辑器");
            }

            try
            {
                System.Windows.Application.Current?.Dispatcher.Invoke(() =>
                {
                    RebuildLayerEntries();
                    var current = SelectedEntry();
                    bool follow = current == null || current.NodeName == null ||
                                  string.Equals(current.NodeName, args.NodeName, System.StringComparison.OrdinalIgnoreCase);
                    if (follow || !matched) ApplyLayerSelection();
                });
            }
            catch { }
        }

        private void OnFlowCleared(string flowId, string nodeName)
        {
            try
            {
                System.Windows.Application.Current?.Dispatcher.Invoke(() =>
                {
                    RebuildLayerEntries();
                    ApplyLayerSelection();
                });
            }
            catch { }
        }

        /// <summary>重建筛选条目：[最新运行] + 每节点（全部图层）+ 每图层。按 (节点,图层) 值保留当前选中。
        /// 本流程没有发布记录时（图 Id 漂移等）兜底展示全部发布，保证节点条目始终可见。</summary>
        private void RebuildLayerEntries()
        {
            var flowId = _model?.SubGraph?.GraphId;
            var own = VisionLayerStore.Instance.GetFlowLayers(flowId ?? "");
            var source = own.Count > 0 ? own : VisionLayerStore.Instance.GetAllLatest();
            var current = SelectedEntry();
            var entries = LayerComboHelper.BuildEntries(flowId ?? "", source);

            _suppressComboSync = true;
            _layerEntries.Clear();
            foreach (var e in entries)
                _layerEntries.Add(e);
            LayerCombo.ItemsSource = _layerEntries.Select(e => e.Display).ToList();

            var index = current == null
                ? 0
                : _layerEntries.FindIndex(x => x.NodeName == current.NodeName && x.LayerName == current.LayerName);
            LayerCombo.SelectedIndex = index >= 0 ? index : 0;
            _suppressComboSync = false;
        }

        private void LayerCombo_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_suppressComboSync) return;
            ApplyLayerSelection();
        }

        /// <summary>按当前筛选显示：最新运行=最后一次发布整体；节点=底图+全部叠加；
        /// 节点.图层=图像层单独显示、区域等叠加层自动附带该节点原图（便于理解）。</summary>
        private void ApplyLayerSelection()
        {
            var preview = DisplayHost.Content as HalconWindow;
            if (preview == null) return;

            var flowId = _model?.SubGraph?.GraphId;
            var entry = SelectedEntry();
            var store = VisionLayerStore.Instance;

            LayerPublishArgs args;
            if (entry == null || entry.NodeName == null)
            {
                // “最新运行”：显示图层库里最近发布的一组（整体替换式显示；图 Id 漂移时兜底全部）
                var all = store.GetFlowLayers(flowId ?? "");
                if (all.Count == 0) all = store.GetAllLatest();
                if (all.Count == 0)
                {
                    preview.ClearImage();
                    RunStatusText.Text = "等待运行…（节点运行后自动显示其图层）";
                    return;
                }
                args = all[all.Count - 1];
            }
            else
            {
                // 图 Id 漂移兜底：按流程查不到时按节点名查（跨流程最近一次发布）
                args = store.GetLatest(flowId ?? "", entry.NodeName)
                    ?? store.GetLatestByNode(entry.NodeName);
                if (args == null || args.Layers.Count == 0)
                {
                    preview.ClearImage();
                    RunStatusText.Text = $"{entry.NodeName} · 尚未运行";
                    return;
                }
            }

            var layers = LayerComboHelper.ResolveLayers(args, entry?.LayerName, flowId);
            if (layers.Count == 0)
            {
                preview.ClearImage();
                RunStatusText.Text = $"{args.NodeName} · 无可显示图层";
                return;
            }
            preview.ShowLayers(layers);
            RunStatusText.Text = $"{args.NodeName} · {(entry?.LayerName ?? $"全部 {layers.Count} 图层")} · #{args.RunStamp}";
        }

        #endregion

        /// <summary>窗口关闭前保存更改回模型</summary>
        public void SaveChanges()
        {
            if (DataContext is HalconFlowModel model && _vm != null)
                model.SubGraph = _vm.Graph;
        }

        /// <summary>窗体“执行”开始：内嵌子流程编辑器进入运行态（UI 线程同步，避免跨线程访问控件）</summary>
        public void BeginRun()
        {
            if (_vm == null) return;
            System.Windows.Application.Current?.Dispatcher.Invoke(() => { _vm.IsRunning = true; });
        }

        /// <summary>窗体“执行”结束（含停止/异常）：恢复非运行态</summary>
        public void EndRun()
        {
            if (_vm == null) return;
            System.Windows.Application.Current?.Dispatcher.Invoke(() => { _vm.IsRunning = false; });
        }

        #region IPluginViewTip 底部提示栏

        private readonly HashSet<System.Windows.DependencyObject> _hoverHooked =
            new HashSet<System.Windows.DependencyObject>();

        /// <summary>承载本视图的基窗体（PluginViewDialog），未承载时为 null</summary>
        private TeamAAS.Dialogs.Dialogs.PluginViewDialog HostDialog =>
            System.Windows.Window.GetWindow(this) as TeamAAS.Dialogs.Dialogs.PluginViewDialog;

        public void ShowTip(string message) => HostDialog?.ShowTip(message);

        public void ShowHoverHint(string message) => HostDialog?.ShowHoverHint(message);

        private void HoverEl_MouseEnter(object sender, System.Windows.Input.MouseEventArgs e)
        {
            if ((sender as System.Windows.FrameworkElement)?.Tag is string tip && !string.IsNullOrWhiteSpace(tip))
                ShowHoverHint(tip);
        }

        private void HoverEl_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e) => ShowHoverHint(null);

        /// <summary>扫描视觉树，给所有 Tag 为非空字符串的按钮挂上悬停提示。</summary>
        private void HookHoverHints(System.Windows.DependencyObject root)
        {
            if (root == null) return;
            var count = System.Windows.Media.VisualTreeHelper.GetChildrenCount(root);
            for (int i = 0; i < count; i++)
            {
                var child = System.Windows.Media.VisualTreeHelper.GetChild(root, i);
                if (child is System.Windows.Controls.Primitives.ButtonBase btn
                    && !_hoverHooked.Contains(btn)
                    && btn.Tag is string tip && !string.IsNullOrWhiteSpace(tip))
                {
                    btn.MouseEnter += HoverEl_MouseEnter;
                    btn.MouseLeave += HoverEl_MouseLeave;
                    _hoverHooked.Add(btn);
                }
                HookHoverHints(child);
            }
        }

        #endregion

        private void BtnProperties_Click(object sender, RoutedEventArgs e)
        {
            if (DataContext is HalconFlowModel model)
            {
                // 编辑容器自身的输入/输出映射：输入用 InputSourceDataProvider（查主流程前置节点），
                // 输出用 PluginDataProvider（查子流程节点）——与 GroupEditorView 一致
                PluginLoader.Instance.SetGroupPluginModel = model.SubGraph;
                PluginLoader.Instance.ParentGroupModel = model;
                if (DialogHelper.EditProperties(model, $"HALCON 流程属性 - {model.NodeName}"))
                {
                    TxtTitle.Text = model.ToolName ?? "Halcon流程";
                    DialogHelper.Info($"已更新 HALCON 流程属性: {model.ToolName}");
                }
                PluginLoader.Instance.SetGroupPluginModel = null;
                // 保留 ParentGroupModel = model，供子节点公式树继续显示「输入」变量
            }
        }
    }
}