using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Security.Permissions;
using System.Windows.Forms;
using BrightIdeasSoftware;
using PDFPatcher.Common;
using PDFPatcher.Model;

namespace PDFPatcher.Functions;

[ToolboxItem(false)]
public partial class MergerControl : FunctionControl
{
	FileListHelper _listHelper;
	readonly SourceItem _itemsContainer = new SourceItem.Empty();
	readonly string[] _bookmarkStyleButtonNames;

	public override string FunctionName => "合并文档";

	public override Bitmap IconImage => Properties.Resources.Merger;

	public MergerControl() {
		InitializeComponent();
		_bookmarkStyleButtonNames = ["_BoldStyleButton", "_BookmarkColorButton", "_ItalicStyleButton"];
		this.OnFirstLoad(OnLoad);
	}

	void OnLoad() {
		var s = this.GetDpiScale();
		_MainToolbar.ScaleElements(s);
		_FileMenu.ScaleElements(s);
		_ItemListMenu.ScaleElements(s);
		_RecentFileMenu.ScaleElements(s);
		_RecentFolderMenu.ScaleElements(s);
		_ItemList.ScaleColumnWidths();

		_BookmarkColorButton.SelectedColorChanged += (s, e) => RefreshBookmarkColor();

		AppContext.MainForm.SetTooltip(_BookmarkControl.FileList, "为目标 PDF 文件添加书签的信息文件（可选）");
		AppContext.MainForm.SetTooltip(_ItemList, "在此添加需要合并的 PDF 文件、图片文件或包含上述类型文件的文件夹");
		AppContext.MainForm.SetTooltip(_ImportButton, "点击此按钮将列表的文件合并为一个 PDF 文件");
		AppContext.MainForm.SetTooltip(_TargetPdfFile.FileList, "生成的目标 PDF 文件路径");
		_ItemList.EmptyListMsg = "请使用“添加文件”按钮添加需要合并的文件，或从资源管理器拖放文件到本列表框";

		var fi = _FileTypeList.Images;
		fi.AddRange([
			Properties.Resources.EmptyPage,
			Properties.Resources.OriginalPdfFile,
			Properties.Resources.Image,
			Properties.Resources.ImageFolder
		]);

		_BookmarkControl.FileDialog.CheckFileExists = false;
		_BookmarkControl.BrowseForFile += FileControl_BrowseForFile;
		_TargetPdfFile.BrowseForFile += FileControl_BrowseForFile;
		_TargetPdfFile.FileDialog.OverwritePrompt = true;
		_IndividualMergerModeBox.CheckedChanged += (s, e) => _BookmarkControl.Enabled = !_IndividualMergerModeBox.Checked;
		_listHelper = new FileListHelper(_ItemList);
		_ItemList.FixEditControlWidth();
		_ItemList.BeforeSorting += (s, e) => e.Canceled = true;
		_ItemList.CanExpandGetter = (x) => ((SourceItem)x).HasSubItems;
		_ItemList.ChildrenGetter = (x) => ((SourceItem)x).Items;
		_ItemList.SelectedIndexChanged += (s, e) => {
			var i = _ItemList.GetFirstSelectedIndex();
			var en = false;
			if (i != -1) {
				var selection = _ItemList.SelectedObjects;
				AppContext.MainForm.StatusText = $"选中 {selection.Count.ToText()} 项，共 {selection.Cast<SourceItem>().Sum(s => s.PageCount).ToText()} 页";
				var b = (_ItemList.GetModelObject(i) as SourceItem).Bookmark;
				if (b != null && !String.IsNullOrEmpty(b.Title)) {
					en = true;
					_BoldStyleButton.Checked = b.IsBold;
					_ItalicStyleButton.Checked = b.IsItalic;
				}
			}
			else {
				UpdateFileStatistics();
			}
			_MainToolbar.ToggleEnabled(en, _bookmarkStyleButtonNames);
		};
		_ItemList.CellEditStarting += (s, e) => {
			_MainToolbar.Enabled = false;
			if (e.Column == _BookmarkColumn) {
				e.Control = new AutoResizingTextBox(e.CellBounds, ((SourceItem)e.RowObject).Bookmark?.Title, (Control)s);
			}
			else if (e.Column == _FolderColumn) {
				if (e.RowObject is SourceItem i && i.FolderName != null) {
					e.Control = new AutoResizingTextBox(e.CellBounds, i.FolderName, (Control)s) { ReadOnly = true };
				}
				else {
					e.Cancel = true;
				}
			}
		};
		_ItemList.CellEditFinishing += (s, e) => _MainToolbar.Enabled = true;
		_ItemList.CanDrop += ItemList_CanDropFile;
		_ItemList.Dropped += ItemList_FileDropped;
		_ItemList.ModelCanDrop += ItemList_CanDropModel;
		_ItemList.ModelDropped += ItemList_Dropped;
		_ItemListMenu.Opening += (s, e) => {
			foreach (ToolStripItem item in _ItemListMenu.Items) {
				SetupCommand(item);
			}
		};
		_ItemList.AsTyped<SourceItem>()
			.ConfigColumn(_NameColumn, c => {
				c.AspectGetter = o => o.FileName ?? "<空白页>";
				c.ImageGetter = o => (int)o.Type;
			})
			.ConfigColumn(_BookmarkColumn, c => {
				c.AspectGetter = (o) => o.Bookmark?.Title;
				c.AspectPutter = (o, v) => {
					var s = v as string;
					if (String.IsNullOrEmpty(s)) {
						o.Bookmark = null;
					}
					else if (o.Bookmark == null) {
						o.Bookmark = new BookmarkSettings(s);
					}
					else {
						o.Bookmark.Title = s;
					}
				};
			})
			.ConfigColumn(_PageRangeColumn, c => {
				c.AspectGetter = (o) => (o as SourceItem.Pdf)?.PageRanges;
				c.AspectPutter = (o, v) => {
					if (o is SourceItem.Pdf p) {
						p.PageRanges = v as string;
						if (String.IsNullOrEmpty(p.PageRanges)) {
							p.PageRanges = "1-" + p.PageCount.ToText();
						}
					}
					UpdateFileStatistics();
				};
			})
			.ConfigColumn(_FolderColumn, c => c.AspectGetter = (o) => o.FolderName);
		FileListHelper.SetupCommonPdfColumns(_FileTimeColumn);
		_AddFilesButton.DropDownOpening += FileListHelper.OpenPdfButtonDropDownOpeningHandler;
		_AddFilesButton.DropDownItemClicked += (s, e) => {
			_RecentFileMenu.Hide();
			FilePath file = e.ClickedItem.ToolTipText;
			if (file.ExistsFile) {
				ExecuteCommand(Commands.OpenFile, file);
				AppContext.RecentItems.AddHistoryItem(AppContext.Recent.SourcePdfFiles, file);
			}
			else {
				FormHelper.ErrorBox("找不到文件：" + file);
			}
		};
	}

	void UpdateFileStatistics() {
		var r = _ItemList.Roots;
		int c = r is System.Collections.IList l ? l.Count : r.Cast<object>().Count();
		AppContext.MainForm.StatusText = c == 0
			? Messages.Welcome
			: $"共 {c.ToText()} 项，{_ItemList.Objects.Cast<SourceItem>().Sum(s => s.RecursivePageCount).ToText()} 页";
	}

	[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
	protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
		if (_ItemList.IsCellEditing || !_ItemList.Focused) {
			return base.ProcessCmdKey(ref msg, keyData);
		}
		switch (keyData) {
			case Keys.Delete:
				ExecuteCommand(Commands.Delete);
				return true;
			case Keys.Control | Keys.B:
				_BoldStyleButton.PerformClick();
				return true;
			case Keys.Control | Keys.I:
				_ItalicStyleButton.PerformClick();
				return true;
			default:
				return base.ProcessCmdKey(ref msg, keyData);
		}
	}

	#region 拖放操作
	void ItemList_CanDropFile(object sender, OlvDropEventArgs e) {
		if (e.DataObject is not DataObject o) {
			return;
		}
		var f = o.GetFileDropList();
		var d = e.DropTargetItem;
		var child = d != null && e.MouseLocation.X > d.Position.X + d.GetBounds(ItemBoundsPortion.ItemOnly).Width / 2;
		var after = d == null || e.MouseLocation.Y > d.Position.Y + d.Bounds.Height / 2;
		foreach (var item in f) {
			if (System.IO.Directory.Exists(item)) {
				e.Handled = true;
				e.Effect = DragDropEffects.Copy;
				e.InfoMessage = $"添加目录{item}到{(child ? "所有子项" : String.Empty)}{(after ? "后面" : "前面")}";
				return;
			}
			var ext = System.IO.Path.GetExtension(item).ToLowerInvariant();
			if (ext == Constants.FileExtensions.Pdf || Constants.FileExtensions.AllSupportedImageExtension.Contains(ext)) {
				e.Handled = true;
				e.Effect = DragDropEffects.Copy;
				e.InfoMessage = $"添加文件{item}到{(child ? "所有子项" : String.Empty)}{(after ? "后面" : "前面")}";
				return;
			}
		}
	}

	void ItemList_FileDropped(object sender, OlvDropEventArgs e) {
		if (e.DataObject is not DataObject o) {
			return;
		}
		var f = o.GetFileDropList();
		var fl = new string[f.Count];
		f.CopyTo(fl, 0);
		SourceItem.SortFileList(fl);
		var sl = new List<SourceItem>(fl.Length);
		foreach (var item in fl) {
			var si = SourceItem.Create(item);
			if (si == null) {
				continue;
			}
			sl.Add(si);
		}
		var ti = e.ListView.GetModelObject(e.DropTargetIndex) as SourceItem;
		var d = e.DropTargetItem;
		var child = d != null && e.MouseLocation.X > d.Position.X + d.GetBounds(ItemBoundsPortion.ItemOnly).Width / 2;
		var after = d != null && e.MouseLocation.Y > d.Position.Y + d.Bounds.Height / 2;
		CopyOrMoveElement(sl, ti, child, after, false);
	}

	void ItemList_CanDropModel(object sender, ModelDropEventArgs e) {
		var si = e.SourceModels;
		var ti = e.TargetModel as SourceItem;
		if (si == null || si.Count == 0 || e.TargetModel == null) {
			e.Effect = DragDropEffects.None;
			return;
		}
		var copy = (ModifierKeys & Keys.Control) != Keys.None;
		if (!copy) {
			if (e.DropTargetItem.Selected) {
				e.Effect = DragDropEffects.None;
				return;
			}
			var al = _ItemList.GetAncestorsOrSelf(ti);
			foreach (SourceItem item in si) {
				if (al.IndexOf(item) != -1) {
					e.Effect = DragDropEffects.None;
					e.InfoMessage = "目标项不能是源项目的子项。";
					return;
				}
			}
		}
		var d = e.DropTargetItem;
		var ml = e.MouseLocation;
		var child = ml.X > d.Position.X + d.GetBounds(ItemBoundsPortion.ItemOnly).Width / 2;
		var append = ml.Y > d.Position.Y + d.Bounds.Height / 2;
		if (!child && !copy) {
			var xi = e.DropTargetIndex + (append ? 1 : -1);
			if (xi > -1 && xi < e.ListView.GetItemCount()
				&& e.ListView.Items[xi].Selected
				&& GetParentSourceItem(ti) == GetParentSourceItem(_ItemList.GetModelObject(xi) as SourceItem)) {
				e.Effect = DragDropEffects.None;
				return;
			}
		}
		e.Effect = copy ? DragDropEffects.Copy : DragDropEffects.Move;
		e.InfoMessage = $"{(copy ? "复制" : "移动")}到{(child ? "所有子项" : String.Empty)}{(append ? "后面" : "前面")}";
	}

	void ItemList_Dropped(object sender, ModelDropEventArgs e) {
		var t = e.TargetModel as SourceItem;
		var si = (e.SourceListView as TreeListView).GetSelectedModels<SourceItem>();
		if (si == null) {
			return;
		}
		var ti = e.TargetModel as SourceItem;
		var d = e.DropTargetItem;
		var child = e.MouseLocation.X > d.Position.X + d.GetBounds(ItemBoundsPortion.ItemOnly).Width / 2;
		var after = e.MouseLocation.Y > d.Position.Y + d.Bounds.Height / 2;
		var copy = (ModifierKeys & Keys.Control) != Keys.None;
		var deepCopy = copy && ((ModifierKeys & Keys.Shift) != Keys.None);
		var tii = _ItemList.TopItemIndex;
		CopyOrMoveElement(si, ti, child, after, copy);
		e.RefreshObjects();
		_ItemList.TopItemIndex = tii;
	}
	#endregion

	public override void SetupCommand(ToolStripItem item) {
		var n = item.Name;
		if (item.OwnerItem != null && item.OwnerItem.Name == Commands.Selection) {
			EnableCommand(item, _ItemList.GetItemCount() > 0 && _ItemList.Focused, true);
		}
		else if (n.HasPrefix(Commands.Copy) || n.HasPrefix(Commands.Paste) || n == Commands.Delete) {
			EnableCommand(item, _ItemList.GetItemCount() > 0 && _ItemList.GetFirstSelectedIndex() > -1, true);
		}
		else if (n == Commands.Options) {
			item.Text = "合并文档设置(&S)...";
			item.ToolTipText = "设置合并后的 PDF 文档";
			EnableCommand(item, true, true);
			item.Tag = nameof(Function.MergerOptions);
		}
		base.SetupCommand(item);
	}

	void FileControl_BrowseForFile(object sender, EventArgs e) {
		_listHelper.PrepareSourceFiles();
	}

	/// <summary>
	/// 复制或移动书签。
	/// </summary>
	/// <param name="source">需要复制或移动的源书签。</param>
	/// <param name="target">目标书签。</param>
	/// <param name="child">是否复制为子节点。</param>
	/// <param name="after">是否复制到后面。</param>
	/// <param name="copy">是否复制书签。</param>
	internal void CopyOrMoveElement(List<SourceItem> source, SourceItem target, bool child, bool after, bool copy) {
		if (copy) {
			var clones = new List<SourceItem>(source.Count);
			foreach (SourceItem item in source) {
				clones.Add(item.Clone());
			}
			source = clones;
		}
		else {
			foreach (var item in source) {
				GetParentSourceItem(item).Items.Remove(item);
			}
			_ItemList.RemoveObjects(source);
		}
		if (child && target != null) {
			if (after) {
				target.Items.AddRange(source);
			}
			else {
				var a = target.Items.ToArray();
				target.Items.Clear();
				target.Items.AddRange(source);
				target.Items.AddRange(a);
			}
			if (target == _itemsContainer) {
				_ItemList.SetObjects(target.Items);
			}
			else {
				_ItemList.Expand(target);
			}
		}
		else {
			var p = GetParentSourceItem(target);
			if (after) {
				p.Items.InsertRange(target != null ? p.Items.IndexOf(target) + 1 : p.Items.Count, source);
			}
			else {
				p.Items.InsertRange(target != null ? p.Items.IndexOf(target) : p.Items.Count, source);
			}
			if (p == _itemsContainer) {
				_ItemList.SetObjects(_itemsContainer.Items);
			}
		}
		_ItemList.SelectedObjects = source;
	}

	SourceItem GetParentSourceItem(SourceItem item) {
		var p = _ItemList.GetParentModel(item);
		p ??= _itemsContainer;
		return p;
	}

	void AddFiles(string[] files) {
		if (files == null || files.Length == 0) {
			return;
		}
		if ((ModifierKeys & Keys.Control) != Keys.None) {
			_ItemList.ClearObjects();
		}
		if (files.Length > 3) {
			AppContext.MainForm.Enabled = false;
		}
		SourceItem.SortFileList(files);
		_AddDocumentWorker.RunWorkerAsync(files);
	}

	void _AddFolder_DropDownOpening(object sender, EventArgs e) {
		var l = _AddFolderButton.DropDown.Items;
		l.ClearDropDownItems();
		foreach (var item in AppContext.Recent.Folders) {
			if (FileHelper.IsPathValid(item) && !String.IsNullOrEmpty(System.IO.Path.GetFileName(item))) {
				l.Add(FileHelper.GetEllipticPath(item, 50)).ToolTipText = item;
			}
		}
	}

	void _AddFolderButton_DropDownItemClicked(object sender, ToolStripItemClickedEventArgs e) {
		_RecentFolderMenu.Hide();
		var f = e.ClickedItem.ToolTipText;
		if (!System.IO.Directory.Exists(f)) {
			FormHelper.ErrorBox("找不到文件夹：" + f);
			return;
		}
		ExecuteCommand(Commands.OpenFile, f);
	}

	void _ImportButton_Click(object sender, EventArgs e) {
		var infoFile = _BookmarkControl.Text.Trim();
		var targetPdfFile = _TargetPdfFile.Text.Trim();
		if (String.IsNullOrEmpty(targetPdfFile) && String.IsNullOrEmpty(targetPdfFile = _TargetPdfFile.BrowseTargetFile())) {
			FormHelper.ErrorBox(Messages.TargetFileNotSpecified);
			return;
		}
		if (!FileHelper.IsPathValid(targetPdfFile)) {
			FormHelper.ErrorBox($"输出文件名无效。{(FileHelper.HasFileNameMacro(targetPdfFile) ? "\n合并 PDF 文件功能不支持替代符。" : String.Empty)}");
			return;
		}

		var l = _ItemList.GetItemCount();
		if (l == 0) {
			FormHelper.InfoBox("请添加用于生成 PDF 文件的图片或 PDF 源文件。");
			return;
		}
		_BookmarkControl.FileList.AddHistoryItem();
		_TargetPdfFile.FileList.AddHistoryItem();
		var fm = _IndividualMergerModeBox.Checked;
		var fl = fm ? new List<SourceItem>(_itemsContainer.Items.Count) : _itemsContainer.Items;

		if (fm) {
			foreach (var item in _itemsContainer.Items) {
				if (item.HasContent) {
					fl.Add(item);
				}
			}
			if (fl.Count == 0) {
				FormHelper.ErrorBox("合并文件列表没有包含文件的首层项目。");
				return;
			}
		}

		AppContext.MainForm.ResetWorker();
		var worker = AppContext.MainForm.GetWorker();
		worker.DoWork += (dummy, arg) => {
			var args = arg.Argument as object[];
			var items = args[0] as ICollection<SourceItem>;
			var target = args[1] as string;
			if (!(bool)args[3]) {
				// 合并为单一文件
				Processor.Worker.MergeDocuments(items, target, args[2] as string);
				return;
			}
			// 顶层项合并为独立文件
			Tracker.SetTotalProgressGoal(items.Count);
			foreach (var item in items) {
				var tn = FileHelper.CombinePath(System.IO.Path.GetDirectoryName(target), item.FileName + Constants.FileExtensions.Pdf);
				switch (item.Type) {
					case SourceItem.ItemType.Empty:
						Tracker.TraceMessage(Tracker.Category.Error, "首层项目不能为空白页。");
						break;
					case SourceItem.ItemType.Pdf:
					case SourceItem.ItemType.Image:
						Processor.Worker.MergeDocuments([item], tn, null);
						break;
					case SourceItem.ItemType.Folder:
						Processor.Worker.MergeDocuments(item.Items, tn, null);
						break;
				}
				Tracker.IncrementTotalProgress();
			}
		};
		worker.RunWorkerAsync(new object[] { fl, targetPdfFile, infoFile, fm });
	}

	void _SortMenu_ItemClicked(object sender, ToolStripItemClickedEventArgs e) {
		SourceItem.SortType sortOptions;
		bool recursive = ModifierKeys != Keys.Control;
		switch (e.ClickedItem.Name) {
			case "_SortByAlphaItem":
				sortOptions = SourceItem.SortType.Literal;
				break;
			case "_SortByNaturalNumberItem":
				sortOptions = SourceItem.SortType.NumericAwareSort;
				break;
			case "_SortByCaj":
				sortOptions = SourceItem.SortType.CajSort;
				break;
			case "_SortByFileTime":
				sortOptions = SourceItem.SortType.FileTime;
				break;
			case "_ReverseSort":
				sortOptions = SourceItem.SortType.Reverse;
				break;
			default:
				return;
		}
		_itemsContainer.SortItems(sortOptions, recursive);
		_ItemList.Objects = _itemsContainer.Items;
	}

	void _MainToolbar_ButtonClick(object sender, EventArgs e) {
		if (sender == _AddFilesButton) {
			ExecuteCommand(Commands.Open);
		}
		else if (sender == _ConfigButton) {
			AppContext.MainForm.SelectFunctionList(Function.MergerOptions);
		}
		else if (sender == _AddFolderButton) {
			using (var f = new OpenFileDialog() {
				FileName = "【选择目录】",
				Filter = _OpenImageBox.Filter,
				CheckFileExists = false,
				Title = "选择包含图片或 PDF 的文件夹，点击“打开”按钮"
			}) {
				if (f.ShowDialog() == DialogResult.OK) {
					var p = System.IO.Path.GetDirectoryName(f.FileName);
					if (String.IsNullOrEmpty(System.IO.Path.GetFileName(p))) {
						FormHelper.ErrorBox("选择的文件夹无效，不允许选择根目录。");
						return;
					}
					ExecuteCommand(Commands.OpenFile, p);
					AppContext.RecentItems.AddHistoryItem(AppContext.Recent.Folders, p);
				}
			}
		}
	}

	void _MainToolbar_ItemClicked(object sender, ToolStripItemClickedEventArgs e) {
		ExecuteCommand(e.ClickedItem);
	}

	public override void ExecuteCommand(string commandName, params string[] parameters) {
		switch (commandName) {
			case Commands.Open:
				if (_OpenImageBox.ShowDialog() == DialogResult.OK) {
					ExecuteCommand(Commands.OpenFile, _OpenImageBox.FileNames);
					foreach (FilePath item in _OpenImageBox.FileNames) {
						if (item.HasExtension(Constants.FileExtensions.Pdf)) {
							AppContext.RecentItems.AddHistoryItem(AppContext.Recent.SourcePdfFiles, item);
						}
					}
				}
				break;
			case Commands.OpenFile:
				AddFiles(parameters);
				break;
			case Commands.LoadList:
				using (var f = new OpenFileDialog() {
					Title = "请选择需要打开的文件列表",
					Filter = Constants.FileExtensions.XmlFilter,
					DefaultExt = Constants.FileExtensions.Xml
				}) {
					if (f.ShowDialog() == DialogResult.OK) {
						_ItemList.DeselectAll();
						_ItemList.ClearObjects();
						_itemsContainer.Items.Clear();
						_itemsContainer.Items.AddRange(Processor.SourceItemSerializer.Deserialize(f.FileName));
						_ItemList.Objects = _itemsContainer.Items;
						UpdateFileStatistics();
					}
				}
				break;
			case Commands.SaveList:
				using (var f = new SaveFileDialog() {
					Title = "请输入需要保存文件列表的文件名",
					Filter = Constants.FileExtensions.XmlFilter,
					DefaultExt = Constants.FileExtensions.Xml
				}) {
					if (f.ShowDialog() == DialogResult.OK) {
						Processor.SourceItemSerializer.Serialize(_itemsContainer.Items, f.FileName);
					}
				}
				break;
			case Commands.Delete:
				if (_ItemList.GetItemCount() == 0) {
					return;
				}
				var l = _ItemList.SelectedObjects;
				if (l.Count == 0) {
					if (FormHelper.YesNoBox("是否清空文件列表？") == DialogResult.Yes) {
						_ItemList.ClearObjects();
						_itemsContainer.Items.Clear();
						UpdateFileStatistics();
					}
				}
				else {
					foreach (SourceItem item in _ItemList.SelectedObjects) {
						GetParentSourceItem(item).Items.Remove(item);
						_ItemList.RemoveObject(item);
					}
					UpdateFileStatistics();
				}
				break;
			case Commands.Copy:
				var sb = StringBuilderCache.Acquire(200);
				var sl = GetSourceItems<SourceItem>(true);
				if (!sl.HasContent()) {
					sl = GetSourceItems<SourceItem>(false);
					if (!sl.HasContent()) {
						return;
					}
				}
				foreach (var item in sl) {
					if (item.Type == SourceItem.ItemType.Empty) {
						if (!String.IsNullOrEmpty(item.Bookmark?.Title)) {
							sb.Append('\t').Append(item.Bookmark.Title).Append('\t').Append('-').AppendLine();
						}
					}
					else if (item.Type == SourceItem.ItemType.Pdf) {
						var pi = item as SourceItem.Pdf;
						sb.AppendLine(String.Join("\t", [
							pi.FilePath.ToString(),
							item.Bookmark != null ? item.Bookmark.Title : String.Empty,
							pi.PageRanges,
							pi.PageCount.ToText ()
						]));
					}
					else if (item.Type == SourceItem.ItemType.Image) {
						var im = item as SourceItem.Image;
						sb.AppendLine(String.Join("\t", [
							im.FilePath.ToString(),
							item.Bookmark != null ? item.Bookmark.Title : String.Empty,
							"-"/*im.PageRanges*/,
							im.PageCount.ToText () ]));
					}
					else if (item.Type == SourceItem.ItemType.Folder) {
						sb.AppendLine(item.FilePath.ToString());
					}
				}
				if (sb.Length > 0) {
					Clipboard.SetText(sb.ToString());
				}
				StringBuilderCache.Release(sb);
				break;
			case "_InsertEmptyPage":
				AddItem(new SourceItem.Empty());
				break;
			case Commands.SelectAllItems:
				_ItemList.SelectAll();
				break;
			case Commands.SelectNone:
				_ItemList.SelectObjects(null);
				break;
			case Commands.InvertSelection:
				_ItemList.InvertSelect();
				break;
			case Commands.SelectAllImages:
				SelectItemsByType(SourceItem.ItemType.Image);
				break;
			case Commands.SelectAllPdf:
				SelectItemsByType(SourceItem.ItemType.Pdf);
				break;
			case Commands.SelectAllFolders:
				SelectItemsByType(SourceItem.ItemType.Folder);
				break;
			case "_EditItemProperty":
			case "_SetPdfOptions":
				_ItemList_ItemActivate(null, null);
				break;
			case "_SetCroppingOptions":
				SetImageCropping();
				break;
			case "_RefreshFolder":
				foreach (SourceItem.Folder item in _ItemList.SelectedObjects) {
					item?.Reload();
				}
				_ItemList.RefreshObjects(_ItemList.SelectedObjects);
				break;
			case "_PdfOptions":
				AppContext.MainForm.SelectFunctionList(Function.PatcherOptions);
				break;
			case "_BoldStyleButton":
				var cb = !_BoldStyleButton.Checked;
				foreach (SourceItem item in _ItemList.SelectedObjects) {
					if (item?.Bookmark != null) {
						item.Bookmark.IsBold = cb;
					}
				}
				goto case "__Refresh";
			case "_ItalicStyleButton":
				var ci = !_ItalicStyleButton.Checked;
				foreach (SourceItem item in _ItemList.SelectedObjects) {
					if (item?.Bookmark != null) {
						item.Bookmark.IsItalic = ci;
					}
				}
				goto case "__Refresh";
			case "_BookmarkColorButton":
				RefreshBookmarkColor();
				break;
			case "_CopyFileName":
				CopySelectedItems(item => item.FilePath.FileNameWithoutExtension);
				break;
			case "_CopyBookmarkText":
				CopySelectedItems(item => item != null && item.Bookmark != null ? item.Bookmark.Title : String.Empty);
				break;
			case "_PasteBookmarkText":
				var ct = Clipboard.GetText(TextDataFormat.UnicodeText);
				if (String.IsNullOrEmpty(ct) || _ItemList.GetItemCount() == 0) {
					break;
				}
				var li = _ItemList.GetLastItemInDisplayOrder().Index;
				using (var sr = new System.IO.StringReader(ct)) {
					var i = _ItemList.GetFirstSelectedIndex();
					if (i == -1) {
						i = 0;
					}
					while (i <= li && sr.Peek() != -1) {
						if (_ItemList.GetModelObject(i) is SourceItem b) {
							if (b.Bookmark == null) {
								b.Bookmark = new BookmarkSettings(sr.ReadLine());
							}
							else {
								b.Bookmark.Title = sr.ReadLine();
							}
						}
						var di = _ItemList.GetDisplayOrderOfItemIndex(i);
						++di;
						var ni = _ItemList.GetNthItemInDisplayOrder(di);
						if (ni == null) {
							break;
						}
						i = ni.Index;
					}
				}
				break;
			case "_ClearBookmarkTitle":
				foreach (SourceItem item in _ItemList.SelectedObjects) {
					if (item?.Bookmark != null) {
						item.Bookmark = null;
					}
				}
				goto case "__Refresh";
			case "_SetBookmarkTitle":
				foreach (SourceItem item in _ItemList.SelectedObjects) {
					if (item != null) {
						BookmarkSettings b;
						var t = System.IO.Path.GetFileNameWithoutExtension(item.FileName);
						if ((b = item.Bookmark) == null) {
							b = item.Bookmark = new BookmarkSettings(t);
						}
						else {
							item.Bookmark.Title = t;
						}
					}
				}
				goto case "__Refresh";
			case "__Refresh":
				_ItemList.RefreshObjects(_ItemList.SelectedObjects);
				break;
		}
	}

	void CopySelectedItems(Converter<SourceItem, string> converter) {
		var bt = StringBuilderCache.Acquire(200);
		foreach (SourceItem item in _ItemList.SelectedObjects) {
			bt.AppendLine(converter(item));
		}
		if (bt.Length > 0) {
			try {
				Clipboard.SetDataObject(bt.ToString(), true, 10, 50);
			}
			catch (System.Runtime.InteropServices.ExternalException) {
				// ignore
			}
		}
		StringBuilderCache.Release(bt);
	}

	void RefreshBookmarkColor() {
		var sc = _BookmarkColorButton.Color == Color.White
						   ? Color.Transparent
						   : _BookmarkColorButton.Color;
		foreach (SourceItem item in _ItemList.SelectedObjects) {
			if (item?.Bookmark != null) {
				item.Bookmark.ForeColor = sc;
			}
		}
		_ItemList.RefreshObjects(_ItemList.SelectedObjects);
	}

	void SelectItemsByType(SourceItem.ItemType type) {
		var r = new List<SourceItem>();
		SelectItemsByType(type, r, _itemsContainer);
		_ItemList.SelectedObjects = r.Count > 0 ? r : null;
	}

	void SelectItemsByType(SourceItem.ItemType type, List<SourceItem> result, SourceItem container) {
		foreach (var item in container.Items) {
			if (item.Type == type) {
				_ItemList.Reveal(item, false);
				result.Add(item);
			}
			if (item.HasSubItems) {
				SelectItemsByType(type, result, item);
			}
		}
	}

	void _ItemList_ItemActivate(object sender, EventArgs e) {
		var vi = GetFocusedPdfItem();
		if (vi != null) {
			var pdfItem = _ItemList.GetModelObject(vi.Index) as SourceItem.Pdf;
			using (SourcePdfOptionForm f = new SourcePdfOptionForm(pdfItem)) {
				if (f.ShowDialog() == DialogResult.OK) {
					_ItemList.RefreshObject(pdfItem);
				}
			}
			return;
		}
		SetImageCropping();
	}

	void SetImageCropping() {
		var items = _ItemList.SelectedObjects;
		if (items.Count == 0) {
			return;
		}

		var s = items[0] as SourceItem.Image;
		int c = 1;
		for (int i = 1; i < items.Count; i++) {
			if (items[i] is not SourceItem.Image image || image.Type == SourceItem.ItemType.Pdf) {
				continue;
			}
			if (s == null) {
				s = image;
				continue;
			}
			c++;
			if (!s.Cropping.Equals(image.Cropping)) {
				if (FormHelper.YesNoBox("选择的图片具有不同的设置，是否重置为统一的值？") == DialogResult.No) {
					return;
				}
				break;
			}
		}
		if (s == null) {
			return;
		}
		var o = new SourceItem.Image(c > 1 ? (FilePath)(c + " 个文件") : s.FilePath) {
			Cropping = s.Cropping.Clone()
		};
		using (var f = new SourceImageOptionForm(o)) {
			if (f.ShowDialog() == DialogResult.OK) {
				foreach (SourceItem.Image image in items) {
					if (image == null || image.Type == SourceItem.ItemType.Pdf) {
						continue;
					}
					image.Cropping = o.Cropping.Clone();
				}
			}
		}
	}

	ListViewItem GetFocusedPdfItem() {
		var vi = _ItemList.FocusedItem;
		if (vi == null
			|| !vi.Text.EndsWith(Constants.FileExtensions.Pdf, StringComparison.OrdinalIgnoreCase)) {
			return null;
		}
		return vi;
	}

	void _ItemListMenu_Opening(object sender, CancelEventArgs e) {
		var vi = _ItemList.FocusedItem;
		if (vi == null) {
			_ItemListMenu.ToggleEnabled(false, "_SetPdfOptions", "_RefreshFolder", "_SetCroppingOptions");
			return;
		}
		var s = _ItemList.GetModelObject(vi.Index) as SourceItem;
		_ItemListMenu.Items["_SetPdfOptions"].Enabled = s.Type == SourceItem.ItemType.Pdf;
		_ItemListMenu.Items["_SetCroppingOptions"].Enabled = s.Type == SourceItem.ItemType.Image;
		_ItemListMenu.Items["_RefreshFolder"].Enabled = s.Type == SourceItem.ItemType.Folder;
	}

	List<T> GetSourceItems<T>(bool selectedOnly) where T : SourceItem {
		if (_ItemList.GetItemCount() == 0) {
			return null;
		}
		var l = selectedOnly ? _ItemList.SelectedObjects : _ItemList.Objects;
		var items = new List<T>(selectedOnly ? 10 : _ItemList.GetItemCount());
		SelectItems(l, items);
		return items;
	}

	static void SelectItems<T>(System.Collections.IEnumerable list, List<T> results) where T : SourceItem {
		foreach (T item in list) {
			if (item == null) {
				continue;
			}
			results.Add(item);
			if (item.HasSubItems) {
				SelectItems(item.Items, results);
			}
		}
	}

	#region AddDocumentWorker
	void _AddDocumentWorker_DoWork(object sender, DoWorkEventArgs e) {
		var files = e.Argument as string[];
		Array.ForEach(files, f => ((BackgroundWorker)sender).ReportProgress(0, f));
	}

	void _AddDocumentWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
		AppContext.MainForm.Enabled = true;
	}

	void _AddDocumentWorker_ProgressChanged(object sender, ProgressChangedEventArgs e) {
		AddItem(SourceItem.Create(e.UserState as string));
	}

	void AddItem(SourceItem item) {
		if (item == null) {
			return;
		}
		_ItemList.Focus();
		AddItems([item]);
	}

	void AddItems(SourceItem[] items) {
		int i = _ItemList.GetLastSelectedIndex();
		if (i == -1) {
			i = _ItemList.FocusedItem?.Index ?? -1;
		}
		if (i == -1) {
			_itemsContainer.Items.AddRange(items);
			_ItemList.Objects = _itemsContainer.Items;
			goto SELECT;
		}
		var m = _ItemList.GetModelObject(i) as SourceItem;
		var p = _ItemList.GetParentModel(m);
		if (p == null) {
			i = _itemsContainer.Items.IndexOf(m);
			_itemsContainer.Items.InsertRange(++i, items);
			_ItemList.Objects = _itemsContainer.Items;
			_ItemList.RebuildAll(true);
			goto SELECT;
		}
		i = p.Items.IndexOf(m);
		p.Items.InsertRange(++i, items);
		_ItemList.RefreshObject(p);
		SELECT:
		_ItemList.SelectedObjects = items;
		_ItemList.FocusedObject = items[0];
	}
	#endregion

	#region IDefaultButtonControl 成员

	public override Button DefaultButton => _ImportButton;

	#endregion

	void _ItemList_FormatRow(object sender, FormatRowEventArgs e) {
		var si = e.Model as SourceItem;
		var bs = si.Bookmark;
		if (bs == null) {
			return;
		}
		e.Item.UseItemStyleForSubItems = false;
		e.UseCellFormatEvents = false;
		var c = e.Item.SubItems[1];
		c.ForeColor = bs.ForeColor.IsEmptyOrTransparent() ? Color.Black : bs.ForeColor;
		if (bs.IsBold || bs.IsItalic) {
			c.Font = new Font(c.Font, (bs.IsBold ? FontStyle.Bold : FontStyle.Regular) | (bs.IsItalic ? FontStyle.Italic : FontStyle.Regular));
		}
	}
}