using System.Collections.ObjectModel;
using System.Diagnostics;
using System.IO;
using System.Windows;
using System.Windows.Controls;

using Autodesk.Revit.DB;

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

using FuzzySharp;

using Nice3point.Revit.Toolkit.External.Handlers;

using Wpf.Ui.Extend.Controls;

using Settings = Sai.RvKits.Properties.Settings;

namespace Sai.RvKits.RvFamily.FamilyLibrary;

public partial class FamilyLibraryViewModel : ObservableObject
{
    public FamilyLibraryViewModel()
    {
        loadFamilyHandler = new ActionEventHandler();
        loadFamilySymbolHandler = new ActionEventHandler();
#if REVIT2018
        familyPath = Settings.Default.FamilyPath_2018;
#elif REVIT2019
		familyPath = Settings.Default.FamilyPath_2019;
#elif REVIT2020
		familyPath = Settings.Default.FamilyPath_2020;
#elif REVIT2021
		familyPath = Settings.Default.FamilyPath_2021;
#endif
        PageSize = 20;
        Initialize();
    }

    private readonly ActionEventHandler loadFamilyHandler;
    private readonly ActionEventHandler loadFamilySymbolHandler;

    [ObservableProperty]
    private string familyPath;

    [ObservableProperty]
    private int pageCount;

    [ObservableProperty]
    private int pageSize;

    [ObservableProperty]
    private string revitVersion;

    [ObservableProperty]
    private FamilyModel selectedFamily;

    [ObservableProperty]
    private FamilySymbolType selectedSymbolType;

    [ObservableProperty]
    private List<FamilySymbolType> symbolTypes;

    [ObservableProperty]
    private bool activeSnackbar;

    [ObservableProperty]
    private Wpf.Ui.Controls.InfoBar messageQueue = new();

    [ObservableProperty]
    private string message;

    partial void OnMessageChanged(string value)
    {
        ActiveSnackbar = true;
    }

    public int FamilyCount => FamilyDataSource.Count;

    /// <summary>
    /// 选择树路径时的源
    /// </summary>
    public ObservableCollection<FamilyModel> FamilyDataSource { get; } = new();

    /// <summary>
    /// 单页显示的源
    /// </summary>
    public ObservableCollection<FamilyModel> FamilyPageListViewItems { get; set; } = new();

    public ObservableCollection<TreeViewItem> FolderTreeViewItems { get; set; } = new();

    [RelayCommand]
    private void LvScroll(ScrollViewer scrollViewer)
    {
        // ReSharper disable once CompareOfFloatsByEqualityOperator
        if (!isLoadingData && scrollViewer.VerticalOffset + scrollViewer.ViewportHeight == scrollViewer.ExtentHeight)
        {
            LoadMoreData();
        }
    }

    private const int BatchSize = 10;
    private bool isLoadingData;

    /// <summary>
    /// 加载目录树节点的初始化数据
    /// </summary>
    private void LoadInitialData()
    {
        isLoadingData = true;
        FamilyPageListViewItems.Clear();
        var size = BatchSize;
        if (FamilyDataSource.Count < BatchSize)
        {
            size = FamilyDataSource.Count;
        }
        for (var i = 0; i < size; i++)
        {
            FamilyPageListViewItems.Add(FamilyDataSource[i]);
        }
        isLoadingData = false;
    }

    /// <summary>
    /// 懒加载
    /// </summary>
    private void LoadMoreData()
    {
        isLoadingData = true;
        var startIndex = FamilyPageListViewItems.Count;
        var end = startIndex + BatchSize;
        if (end > FamilyDataSource.Count)
        {
            end = FamilyDataSource.Count;
        }
        if (startIndex < end + 1)
        {
            for (var i = startIndex; i < end; i++)
            {
                FamilyPageListViewItems.Add(FamilyDataSource[i]);
            }
        }
        isLoadingData = false;
    }

    /// <summary>
    ///     递归获取路径下的所有族文件
    /// </summary>
    /// <param name="fullPath"></param>
    private void GetFamilyFile(string fullPath)
    {
        DirectoryInfo dir = new(fullPath);
        try
        {
            if (!dir.Exists)
            {
                return;
            }
            //文件系统，包含文件夹和文件
            var files = dir.GetFileSystemInfos();
            foreach (var fSys in files)
            {
                //FSys如果是文件则fileinfo不为空

                if (fSys is FileInfo fileInfo)
                {
                    if (fileInfo.Extension == ".rfa")
                    {
                        var sfInfo = new FileInfo(fileInfo.DirectoryName + "\\" + fileInfo.Name);
                        //RevitFileUtil.ParserRevitFile(sfInfo.FullName);
                        var model = new FamilyModel
                        {
                            FileInfo = sfInfo,
                            Path = sfInfo.FullName,
                            Title = Path.GetFileNameWithoutExtension(sfInfo.FullName),
                            ToolTip = sfInfo.Name
                            //RevitVersion = RevitFileUtil.RevitVersion
                        };

                        FamilyDataSource.Add(model);
                    }
                }
                else //当fileinfo为空，即为文件夹，向下查找
                {
                    GetFamilyFile($"{fullPath}\\{fSys}");
                }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    /// <summary>
    ///     将族加载到当前文件中
    /// </summary>
    [RelayCommand]
    private void ImportFamily(FamilyModel model)
    {
        //将model的绑定数据传给外部事件
        loadFamilyHandler.Raise(app =>
        {
            try
            {
                var doc = app.ActiveUIDocument.Document;
                Family family;
                FamilySymbol fs = null;
                doc.Invoke(
                    _ =>
                    {
                        family = doc.GetOrLoadedFamily(model.Path);
                        fs = doc.GetElement(family.GetFamilySymbolIds().FirstOrDefault()) as FamilySymbol;
                        //if (fs != null && !fs.IsActive)
                        //{
                        //    fs.Activate();
                        //}
                        //if (family == null)
                        //{
                        //    doc.LoadFamily(FileLibModel.Path, familyLoadOption, out family);
                        //    fs = doc.GetElement(family.GetFamilySymbolIds().FirstOrDefault()) as FamilySymbol;
                        //
                        //}
                        //else
                        //{
                        //    MessageBox.ShowAhead("族已载入或载入失败。", "提示");
                        //}
                    },
                    "载入族-" + Path.GetFileNameWithoutExtension(model.Path)
                );
                if (fs != null && app.ActiveUIDocument.CanPlaceElementType(fs))
                {
                    app.ActiveUIDocument.PromptForFamilyInstancePlacement(fs);
                }
            }
            catch (Autodesk.Revit.Exceptions.OperationCanceledException) { }
            catch (Exception e)
            {
                Message = e.Message;
                e.Message.ToLog();
            }
        });
    }

    [RelayCommand]
    private void ImportFamilySymbol()
    {
        if (SelectedFamily == null || SelectedSymbolType == null)
        {
            return;
        }

        loadFamilySymbolHandler.Raise(app =>
        {
            var uidoc = app.ActiveUIDocument;
            var doc = uidoc.Document;
            //当前选择的族类型
            FamilySymbol fs = null;
            if (SelectedSymbolType.Name == null)
            {
                return;
            }

            doc.Invoke(
                _ =>
                {
                    var fam = doc.GetOrLoadedFamily(SelectedFamily.Path);
                    doc.Regenerate();
                    //if (fam == null)
                    //{
                    //    doc.LoadFamilySymbol(FamilyPath, FamilySymbolName, out fs);
                    //}
                    //else
                    //{
                    var x = fam.GetFamilySymbolIds()
                        .FirstOrDefault(id => doc.GetElement(id).Name == SelectedSymbolType.Name);
                    fs = doc.GetElement(x) as FamilySymbol;
                    //}
                    if (fs?.IsActive == false)
                    {
                        fs.Activate();
                    }
                },
                "载入族-" + Path.GetFileNameWithoutExtension(SelectedFamily.Path) + " 类型:" + SelectedSymbolType.Name
            );

            try
            {
                if (fs != null && uidoc.CanPlaceElementType(fs))
                {
                    app.ActiveUIDocument.PromptForFamilyInstancePlacement(fs);
                }
            }
            catch (Autodesk.Revit.Exceptions.OperationCanceledException) { }
            catch (Exception e)
            {
                e.Message.ToLog();
            }
        });
    }

    private void Initialize()
    {
        PopulateTreeView(FamilyPath);
        GetFamilyFile(FamilyPath);
        //CurrentPageIndex = 0;
        LoadInitialData();
        //PageCount = GetPageCount();
        //PageOrderNumberCollection = GetOrderIntCollection();
        //CollectionViewSource.GetDefaultView(FamilyPageListViewItems);
    }

    [RelayCommand]
    private static void LocationFamilyFile(object obj)
    {
        //System.Windows.Controls.Button btn = obj as System.Windows.Controls.Button;
        if (obj is FamilyModel familyInfo)
        {
            var proc = new System.Diagnostics.Process();
            proc.StartInfo.FileName = "explorer";
            //打开资源管理器
            proc.StartInfo.Arguments = "/select," + familyInfo.Path;
            proc.Start();
        }
    }

    [RelayCommand]
    private void LvSelectionChanged(object obj)
    {
        if (obj is FamilyModel familyInfo)
        {
            RevitFileUtil.ParserRevitFile(familyInfo.Path);
            SymbolTypes = RevitFileUtil.SymbolTypes;
            SelectedSymbolType = SymbolTypes.FirstOrDefault();
            RevitVersion = RevitFileUtil.RevitVersion;
        }
    }

    /// <summary>
    ///     绑定TreeView数据源.
    /// </summary>
    /// <param name="path">The Path<see cref="string" />.</param>
    private void PopulateTreeView(string path)
    {
        FolderTreeViewItems?.Clear();

        var info = new DirectoryInfo(path);
        if (!info.Exists)
        {
            return;
        }

        var rootNode = new TreeViewItem { Header = info.Name, Tag = info.FullName };

        /* 项目“Sai.RvKits (net481)”的未合并的更改
		在此之前:
		        SubDirectories(info.GetDirectories(), rootNode);
		在此之后:
		        FamilyLibraryViewModel.SubDirectories(info.GetDirectories(), rootNode);
		*/
        SubDirectories(info.GetDirectories(), rootNode);
        //dirTree.DataContext = rootNode;
        FolderTreeViewItems!.Add(rootNode);
        rootNode.IsExpanded = true;
    }

    [RelayCommand]
    private void SearchFamily(object obj)
    {
        //ListViewItem foundItem =
        //    textListView.FindItemWithText(searchBox.Text, false, 0, true);
        //if (foundItem != null)
        //{
        //    textListView.TopItem = foundItem;
        //}
        //Func<string, bool> searchFunc = BreakCurve;
        //Task<bool> task = new Task<bool>(() => BreakCurve(obj.ToString()));
        //task.Start();
        //await task;
        if (string.IsNullOrEmpty(obj.ToString()))
        {
            LoadInitialData();
            //FamilyPageListViewItems.Clear();
            //itemsLoaded.ForEach(item => FamilyPageListViewItems.Add(item));
        }
        else
        {
            //itemsLoaded.Clear();
            //FamilyPageListViewItems.ForEach(item => itemsLoaded.Add(item));
            FamilyPageListViewItems.Clear();
            foreach (var item in FamilyDataSource)
            {
                if (Fuzz.PartialRatio(item.Title,obj.ToString())>70)
                {
                    FamilyPageListViewItems.Add(item);

                }
                //if (item.Title.Contains(obj.ToString()))
                //{
                //}
            }
        }
    }

    /// <summary>
    ///     选择树状节点
    /// </summary>
    /// <param name="obj"></param>
    [RelayCommand]
    private void SelectDirTreeNode(object obj)
    {
        //e.OriginalSource 就是TreeViewItem对象，你可以将其保存到窗体类的某个私有字段中，或者直接使用它，如下所示：
        FamilyDataSource.Clear();
        if (obj is TreeViewItem selectedItem)
        {
            GetFamilyFile(selectedItem.Tag.ToString());
        }
        LoadInitialData();
        SymbolTypes = null;
    }

    /// <summary>
    ///     路径选择.
    /// </summary>
    [RelayCommand]
    private void SelectPath()
    {
        var dialog = new VistaFolderBrowserDialog();
        if (dialog.ShowDialog() == true)
        {
            try
            {
#if REVIT2018
                Settings.Default.FamilyPath_2018 = dialog.SelectedPath;
#elif REVIT2019
				Settings.Default.FamilyPath_2019 = dialog.SelectedPath;
#elif REVIT2020
				Settings.Default.FamilyPath_2020 = dialog.SelectedPath;
#elif REVIT2021
				Settings.Default.FamilyPath_2021 = dialog.SelectedPath;
#endif
                PopulateTreeView(dialog.SelectedPath);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }

    /// <summary>
    ///     递归添加目录结构到TreeView根节点.
    /// </summary>
    /// <param name="subDirs">.</param>
    /// <param name="nodeToAddTo">根节点.</param>
    private static void SubDirectories(DirectoryInfo[] subDirs, TreeViewItem nodeToAddTo)
    {
        //父节点
        foreach (var subDir in subDirs)
        {
            var aNode = new TreeViewItem { Header = subDir.Name, Tag = subDir.FullName };
            //获取子目录
            var subSubDirs = subDir.GetDirectories();
            if (subSubDirs.Length != 0)
            {
                /* 项目“Sai.RvKits (net481)”的未合并的更改
				在此之前:
				                SubDirectories(subSubDirs, aNode);
				在此之后:
				                FamilyLibraryViewModel.SubDirectories(subSubDirs, aNode);
				*/
                SubDirectories(subSubDirs, aNode);
            }

            nodeToAddTo.Items.Add(aNode);
        }
    }
}