using Laservall.Solidworks.Extension;
using Laservall.Solidworks.Model;
using Laservall.Solidworks.Windows.ViewModel;
using SolidWorks.Interop.sldworks;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;

namespace Laservall.Solidworks.Windows
{
    public class LevelToMarginConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is int level)
            {
                return new Thickness(level * 20, 0, 0, 0);
            }
            return new Thickness(0);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    public class ExpandIconConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is bool expanded)
            {
                return expanded ? "▼" : "▶";
            }
            return "▶";
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

    public partial class ItemsPropWindow : System.Windows.Window
    {
        private List<BomItemModel> allBomItems = new List<BomItemModel>();
        private HashSet<string> dirtyDocPaths = new HashSet<string>();
        private BomSettings currentSettings;

        private static readonly HashSet<string> StaticColumnProps = new HashSet<string>
        {
            "零件名称", "材质", "属性", "材料"
        };
        private static readonly Dictionary<string, string> PropNameToModelField = new Dictionary<string, string>
        {
            { "PartName", "零件名称" },
            { "MaterialProp", "材料" },
            { "Material", "材质" },
            { "Classification", "属性" }
        };

        private static readonly Dictionary<string, string> BuiltInColumnNameMap = new Dictionary<string, string>
        {
            { "层级", "LevelColumn" },
            { "图号", "DrawingNoColumn" },
            { "零件名称", "ConfigNameColumn" },
            { "属性", "ClassificationColumn" },
            { "材料", "MaterialPropColumn" },
            { "材质", "MaterialColumn" },
            { "数量", "QuantityColumn" },
            { "装配体", "IsAssemblyColumn" },
            { "外购件", "IsOutSourcingColumn" }
        };

        public ItemsPropWindow()
        {
            InitializeComponent();
            if (DataContext == null)
            {
                DataContext = new ItemsViewModel();
            }
            currentSettings = BomSettings.Load();
        }

        private async void Window_Loaded(object sender, RoutedEventArgs e)
        {
            if (!(DataContext is ItemsViewModel viewModel))
            {
                return;
            }

            viewModel.IsLoading = true;
            viewModel.LoadingProgress = 0;
            viewModel.LoadingProgressMaximum = 1;
            viewModel.LoadingText = "正在读取数据...";

            try
            {
                await System.Threading.Tasks.Task.Yield();

                ModelDoc2 model = SWUtils.SwApp.ActiveDoc as ModelDoc2;
                if (model == null)
                {
                    viewModel.BomItems = new ObservableCollection<BomItemModel>();
                    return;
                }

                Configuration config = model.ConfigurationManager.ActiveConfiguration;

                var allParts = new SwAssDocTreeModel()
                {
                    drawingNo = Path.GetFileNameWithoutExtension(model.GetPathName()),
                    docPath = model.GetPathName(),
                    configName = config?.Name ?? "",
                    children = new List<SwAssDocTreeModel>(),
                    isAss = true,
                    quantity = 1,
                    props = SWUtils.GetConfig3(model.GetPathName())
                };

                Component2 rootComponent = config?.GetRootComponent3(true) as Component2;
                int totalCount = GetTotalComponentCount(model);

                viewModel.LoadingProgressMaximum = totalCount;
                viewModel.LoadingText = "正在解析装配结构...";

                SWUtils.SetAllPartResolved(model.GetPathName());

                if (rootComponent != null)
                {
                    var progress = new Progress<SwTreeLoadProgress>(p =>
                    {
                        viewModel.LoadingProgressMaximum = p.Total;
                        viewModel.LoadingProgress = p.Processed;
                        viewModel.LoadingText = string.IsNullOrWhiteSpace(p.CurrentName)
                            ? $"正在读取数据 ({p.Processed}/{p.Total})"
                            : $"正在读取 {p.CurrentName} ({p.Processed}/{p.Total})";
                    });

                    var parts = await SWUtils.GetSwAssDocTreeChildrenAsync(rootComponent, true, true, totalCount, progress);
                    allParts.children.AddRange(parts);
                }

                viewModel.LoadingText = "正在生成BOM...";

                allBomItems = SWUtils.FlattenBomTree(allParts);
                var propKeys = SWUtils.CollectAllPropertyKeys(allBomItems);

                var dynamicKeys = propKeys
                    .Where(k => !StaticColumnProps.Contains(k))
                    .OrderBy(k => k)
                    .ToList();

                currentSettings.MergeDynamicKeys(dynamicKeys);

                var userAddedKeys = currentSettings.Columns
                    .Where(c => c.IsUserAdded && !dynamicKeys.Contains(c.Name))
                    .Select(c => c.Name)
                    .ToList();
                dynamicKeys.AddRange(userAddedKeys);

                EnsurePropsKeys(dynamicKeys);

                viewModel.AllPropertyKeys = dynamicKeys;
                AddDynamicColumns(dynamicKeys);
                ApplyColumnVisibility();

                ApplyViewMode(viewModel);
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show(this, ex.Message, "读取数据失败", MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                viewModel.IsLoading = false;
            }
        }

        private void AddDynamicColumns(List<string> propKeys)
        {
            foreach (var key in propKeys)
            {
                var column = new DataGridTextColumn
                {
                    Header = key,
                    Width = new DataGridLength(100),
                    Binding = new Binding($"Props[{key}]")
                    {
                        Mode = BindingMode.TwoWay,
                        UpdateSourceTrigger = UpdateSourceTrigger.LostFocus
                    }
                };
                BomDataGrid.Columns.Add(column);
            }
        }

        private void EnsurePropsKeys(List<string> keys)
        {
            foreach (var item in allBomItems)
            {
                if (item.Props == null)
                {
                    item.Props = new Dictionary<string, string>();
                }
                foreach (var key in keys)
                {
                    if (!item.Props.ContainsKey(key))
                    {
                        item.Props[key] = "";
                    }
                }
            }
        }

        private void ApplyColumnVisibility()
        {
            if (currentSettings == null)
            {
                return;
            }

            foreach (var col in BomDataGrid.Columns)
            {
                string header = col.Header?.ToString();
                if (string.IsNullOrEmpty(header))
                {
                    continue;
                }

                var config = currentSettings.GetColumn(header);
                if (config != null)
                {
                    col.Visibility = config.IsVisible ? Visibility.Visible : Visibility.Collapsed;
                }
            }
        }

        private void ColumnConfig_Click(object sender, RoutedEventArgs e)
        {
            var configWindow = new ColumnConfigWindow(currentSettings);
            configWindow.Owner = this;

            if (configWindow.ShowDialog() == true && configWindow.ResultSettings != null)
            {
                currentSettings = configWindow.ResultSettings;
                currentSettings.Save();

                if (DataContext is ItemsViewModel viewModel)
                {
                    var existingDynamicHeaders = new HashSet<string>();
                    var toRemove = new List<DataGridColumn>();
                    foreach (var col in BomDataGrid.Columns)
                    {
                        string header = col.Header?.ToString();
                        if (!string.IsNullOrEmpty(header) && !BuiltInColumnNameMap.ContainsKey(header))
                        {
                            existingDynamicHeaders.Add(header);
                            toRemove.Add(col);
                        }
                    }

                    foreach (var col in toRemove)
                    {
                        BomDataGrid.Columns.Remove(col);
                    }

                    var dynamicKeys = currentSettings.Columns
                        .Where(c => !c.IsFixed)
                        .Select(c => c.Name)
                        .ToList();

                    EnsurePropsKeys(dynamicKeys);
                    viewModel.AllPropertyKeys = dynamicKeys;
                    AddDynamicColumns(dynamicKeys);
                }

                ApplyColumnVisibility();
            }
        }

        private void ToggleExpand_Click(object sender, RoutedEventArgs e)
        {
            if (!(sender is System.Windows.Controls.Primitives.ToggleButton toggle))
            {
                return;
            }

            if (!(toggle.DataContext is BomItemModel item))
            {
                return;
            }

            UpdateChildrenVisibility(item);
        }

        private void UpdateChildrenVisibility(BomItemModel parentItem)
        {
            bool shouldShow = parentItem.IsExpanded;
            var descendants = GetDescendants(parentItem.NodeId);

            foreach (var child in descendants)
            {
                if (!shouldShow)
                {
                    child.IsVisible = false;
                }
                else
                {
                    child.IsVisible = IsAncestorChainExpanded(child);
                }
            }
        }

        private bool IsAncestorChainExpanded(BomItemModel item)
        {
            int parentId = item.ParentNodeId;
            while (parentId >= 0)
            {
                var parent = allBomItems.FirstOrDefault(b => b.NodeId == parentId);
                if (parent == null)
                {
                    break;
                }
                if (!parent.IsExpanded)
                {
                    return false;
                }
                parentId = parent.ParentNodeId;
            }
            return true;
        }

        private List<BomItemModel> GetDescendants(int parentNodeId)
        {
            var result = new List<BomItemModel>();
            var directChildren = allBomItems.Where(b => b.ParentNodeId == parentNodeId).ToList();
            foreach (var child in directChildren)
            {
                result.Add(child);
                result.AddRange(GetDescendants(child.NodeId));
            }
            return result;
        }

        private void ExpandAll_Click(object sender, RoutedEventArgs e)
        {
            foreach (var item in allBomItems)
            {
                item.IsExpanded = true;
                item.IsVisible = true;
            }
        }

        private void CollapseAll_Click(object sender, RoutedEventArgs e)
        {
            foreach (var item in allBomItems)
            {
                if (item.HasChildren)
                {
                    item.IsExpanded = false;
                }
                item.IsVisible = item.Level == 0;
            }
        }

        private void BomDataGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
        {
            if (e.EditAction == DataGridEditAction.Cancel)
            {
                return;
            }

            if (!(e.Row.Item is BomItemModel item))
            {
                return;
            }

            if (!string.IsNullOrEmpty(item.DocPath))
            {
                dirtyDocPaths.Add(item.DocPath);
            }

            if (e.EditingElement is TextBox textBox)
            {
                string newValue = textBox.Text;
                string header = e.Column.Header?.ToString() ?? "";

                if (PropNameToModelField.ContainsValue(header))
                {
                    if (item.Props != null)
                    {
                        item.Props[header] = newValue;
                    }
                }
                else if (item.Props != null && item.Props.ContainsKey(header))
                {
                    item.Props[header] = newValue;
                }
            }
        }

        private void SaveChanges_Click(object sender, RoutedEventArgs e)
        {
            if (dirtyDocPaths.Count == 0)
            {
                System.Windows.MessageBox.Show(this, "没有需要保存的修改", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                return;
            }

            try
            {
                int savedCount = 0;
                foreach (var docPath in dirtyDocPaths)
                {
                    var item = allBomItems.FirstOrDefault(b => b.DocPath == docPath);
                    if (item == null || item.Props == null)
                    {
                        continue;
                    }

                    ModelDoc2 doc = SWUtils.OpenDocSilently(docPath);
                    if (doc == null)
                    {
                        continue;
                    }

                    Configuration activeConfig = doc.ConfigurationManager?.ActiveConfiguration;
                    CustomPropertyManager configPropMgr = activeConfig?.CustomPropertyManager;

                    CustomPropertyManager filePropMgr = null;
                    try
                    {
                        filePropMgr = doc.Extension?.get_CustomPropertyManager("");
                    }
                    catch { }

                    foreach (var kvp in item.Props)
                    {
                        if (string.IsNullOrEmpty(kvp.Key)) continue;

                        bool writtenToConfig = false;
                        if (configPropMgr != null)
                        {
                            var configNames = configPropMgr.GetNames() as string[];
                            if (configNames != null && configNames.Contains(kvp.Key))
                            {
                                configPropMgr.Set2(kvp.Key, kvp.Value ?? "");
                                writtenToConfig = true;
                            }
                        }

                        if (!writtenToConfig && filePropMgr != null)
                        {
                            filePropMgr.Set2(kvp.Key, kvp.Value ?? "");
                        }
                        else if (!writtenToConfig && configPropMgr != null)
                        {
                            configPropMgr.Set2(kvp.Key, kvp.Value ?? "");
                        }
                    }

                    doc.Save3(0, 0, 0);
                    savedCount++;
                }

                dirtyDocPaths.Clear();
                System.Windows.MessageBox.Show(this, $"已保存 {savedCount} 个文件的属性修改", "保存成功", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show(this, ex.Message, "保存失败", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private void SearchBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (!(DataContext is ItemsViewModel viewModel))
            {
                return;
            }

            string keyword = SearchBox.Text?.Trim() ?? "";
            var sourceList = GetCurrentSourceList();

            if (string.IsNullOrEmpty(keyword))
            {
                viewModel.BomItems = new ObservableCollection<BomItemModel>(sourceList);
                return;
            }

            var filtered = sourceList.Where(item =>
                (item.DrawingNo != null && item.DrawingNo.IndexOf(keyword, StringComparison.OrdinalIgnoreCase) >= 0) ||
                (item.ConfigName != null && item.ConfigName.IndexOf(keyword, StringComparison.OrdinalIgnoreCase) >= 0) ||
                (item.Material != null && item.Material.IndexOf(keyword, StringComparison.OrdinalIgnoreCase) >= 0) ||
                (item.MaterialProp != null && item.MaterialProp.IndexOf(keyword, StringComparison.OrdinalIgnoreCase) >= 0) ||
                (item.Classification != null && item.Classification.IndexOf(keyword, StringComparison.OrdinalIgnoreCase) >= 0) ||
                (item.Props != null && item.Props.Values.Any(v => v != null && v.IndexOf(keyword, StringComparison.OrdinalIgnoreCase) >= 0))
            ).ToList();

            viewModel.BomItems = new ObservableCollection<BomItemModel>(filtered);
        }

        private void ExportExcel_Click(object sender, RoutedEventArgs e)
        {
            if (!(DataContext is ItemsViewModel viewModel) || viewModel.BomItems == null || viewModel.BomItems.Count == 0)
            {
                System.Windows.MessageBox.Show(this, "没有数据可导出", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                return;
            }

            var dialog = new Microsoft.Win32.SaveFileDialog
            {
                Filter = "CSV 文件|*.csv",
                DefaultExt = ".csv",
                FileName = "BOM_Export"
            };

            if (dialog.ShowDialog() != true)
            {
                return;
            }

            try
            {
                var sb = new StringBuilder();
                bool isFlatView = viewModel.IsFlatView;

                var builtInDefs = new List<(string Name, Func<BomItemModel, string> Getter, bool FlatOnly)>
                {
                    ("层级", item => item.LevelDisplay ?? "", false),
                    ("图号", item => item.DrawingNo ?? "", false),
                    ("零件名称", item => item.ConfigName ?? "", false),
                    ("属性", item => item.Classification ?? "", false),
                    ("材料", item => item.MaterialProp ?? "", false),
                    ("材质", item => item.Material ?? "", false),
                    ("数量", item => item.Quantity.ToString(), false),
                    ("装配体", item => item.IsAssembly ? "是" : "否", false),
                    ("外购件", item => item.IsOutSourcing ? "是" : "否", false)
                };

                var exportBuiltIns = builtInDefs
                    .Where(d => currentSettings.IsColumnExport(d.Name))
                    .Where(d => !isFlatView || (d.Name != "层级" && d.Name != "装配体"))
                    .ToList();

                var exportDynamicKeys = (viewModel.AllPropertyKeys ?? new List<string>())
                    .Where(k => currentSettings.IsColumnExport(k))
                    .ToList();

                var headers = exportBuiltIns.Select(d => d.Name).Concat(exportDynamicKeys).ToList();
                sb.AppendLine(string.Join(",", headers.Select(EscapeCsvField)));

                foreach (var item in viewModel.BomItems)
                {
                    var fields = new List<string>();
                    foreach (var def in exportBuiltIns)
                    {
                        fields.Add(def.Getter(item));
                    }
                    foreach (var key in exportDynamicKeys)
                    {
                        fields.Add(item.GetProp(key));
                    }
                    sb.AppendLine(string.Join(",", fields.Select(EscapeCsvField)));
                }

                File.WriteAllText(dialog.FileName, sb.ToString(), Encoding.UTF8);
                System.Windows.MessageBox.Show(this, $"已导出到:\n{dialog.FileName}", "导出成功", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show(this, ex.Message, "导出失败", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private static string EscapeCsvField(string field)
        {
            if (string.IsNullOrEmpty(field))
            {
                return "";
            }

            if (field.Contains(",") || field.Contains("\"") || field.Contains("\n"))
            {
                return "\"" + field.Replace("\"", "\"\"") + "\"";
            }
            return field;
        }

        private void FlatViewToggle_Changed(object sender, RoutedEventArgs e)
        {
            if (!(DataContext is ItemsViewModel viewModel))
            {
                return;
            }

            ApplyViewMode(viewModel);
        }

        private void ApplyViewMode(ItemsViewModel viewModel)
        {
            bool isFlatView = viewModel.IsFlatView;

            LevelColumn.Visibility = isFlatView ? Visibility.Collapsed : Visibility.Visible;
            ExpandAllBtn.Visibility = isFlatView ? Visibility.Collapsed : Visibility.Visible;
            CollapseAllBtn.Visibility = isFlatView ? Visibility.Collapsed : Visibility.Visible;

            if (isFlatView)
            {
                var flat = allBomItems
                    .Where(i => !i.IsAssembly)
                    .GroupBy(i => i.DrawingNo ?? "")
                    .Select(g =>
                    {
                        var first = g.First();
                        return new BomItemModel
                        {
                            Level = 0,
                            LevelDisplay = "",
                            DrawingNo = first.DrawingNo,
                            ConfigName = first.ConfigName,
                            PartName = first.PartName,
                            MaterialProp = first.MaterialProp,
                            Material = first.Material,
                            Classification = first.Classification,
                            Quantity = g.Sum(x => x.Quantity),
                            IsAssembly = false,
                            IsOutSourcing = first.IsOutSourcing,
                            DocPath = first.DocPath,
                            Props = first.Props,
                            HasChildren = false,
                            IsExpanded = false,
                            IsVisible = true
                        };
                    })
                    .ToList();

                viewModel.BomItems = new ObservableCollection<BomItemModel>(flat);
            }
            else
            {
                viewModel.BomItems = new ObservableCollection<BomItemModel>(allBomItems);
            }
        }

        private List<BomItemModel> GetCurrentSourceList()
        {
            if (!(DataContext is ItemsViewModel viewModel))
            {
                return allBomItems;
            }

            if (viewModel.IsFlatView)
            {
                return allBomItems
                    .Where(i => !i.IsAssembly)
                    .GroupBy(i => i.DrawingNo ?? "")
                    .Select(g =>
                    {
                        var first = g.First();
                        return new BomItemModel
                        {
                            Level = 0,
                            LevelDisplay = "",
                            DrawingNo = first.DrawingNo,
                            ConfigName = first.ConfigName,
                            PartName = first.PartName,
                            MaterialProp = first.MaterialProp,
                            Material = first.Material,
                            Classification = first.Classification,
                            Quantity = g.Sum(x => x.Quantity),
                            IsAssembly = false,
                            IsOutSourcing = first.IsOutSourcing,
                            DocPath = first.DocPath,
                            Props = first.Props,
                            HasChildren = false,
                            IsExpanded = false,
                            IsVisible = true
                        };
                    })
                    .ToList();
            }

            return allBomItems;
        }

        private int GetTotalComponentCount(ModelDoc2 model)
        {
            AssemblyDoc assembly = model as AssemblyDoc;
            if (assembly == null)
            {
                return 1;
            }

            object[] components = assembly.GetComponents(true) as object[];
            return Math.Max((components?.Length ?? 0) + 1, 1);
        }
    }
}