using System;
using System.Drawing;
using System.Security.Permissions;
using System.Windows.Forms;
using BrightIdeasSoftware;
using PDFPatcher.Common;
using PDFPatcher.Functions.Editor;
using PDFPatcher.Model;
using PDFPatcher.Processor;

namespace PDFPatcher.Functions;

public sealed partial class EditorControl : FunctionControl, IDocumentEditor, IEditView
{
	static readonly Color __DarkModeColor = Color.DarkGray;
	static readonly Color __GreenModeColor = Color.FromArgb(0xCC, 0xFF, 0xCC);

	AutoBookmarkForm _autoBookmarkForm;
	readonly Controller _controller;

	#region DEBUG
	static EditorControl() {
		MuPDF.Context.SetErrorCallback((err, msg) => System.Diagnostics.Debug.WriteLine((err ? "ERR: " : "WARN: ") + msg));
	}
	#endregion

	public EditorControl() {
		InitializeComponent();
		_controller = new Controller(this);
		this.OnFirstLoad(OnLoad);
	}

	public override string FunctionName => "文档编辑器";

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

	public string DocumentPath {
		get => _controller?.Model.DocumentPath;
		set {
			_controller.Model.DocumentPath = value;
			DocumentChanged?.Invoke(this, new DocumentChangedEventArgs(value));
		}
	}
	public bool IsBusy => _controller.IsBusy;
	public bool IsDirty => _controller.Model.Undo.IsDirty;

	public event EventHandler<DocumentChangedEventArgs> DocumentChanged;

	void OnLoad() {
		new Editor.Parts.BookmarkInViewSynchronizer(_BookmarkBox, _ViewerBox);
		new Editor.Parts.BookmarkTitleEditHandler(_controller);
		new Editor.Parts.CurrentPageBoxHandler(_CurrentPageBox, _ViewerBox);
		new Editor.Parts.MousePositionInfoHandler(_PageInfoBox, _ViewerBox);
		ListRecentFiles = _OpenButton_DropDownOpening;
		RecentFileItemClicked = _OpenButton_DropDownItemClicked;
		var s = this.GetDpiScale();
		_BookmarkToolbar.ScaleElements(s);
		_ViewerToolbar.ScaleElements(s);
		_EditMenu.ScaleElements(s);
		_RecentFileMenu.ScaleElements(s);
		_SelectionMenu.ScaleElements(s);
		_UndoMenu.ScaleElements(s);
		_ViewerMenu.ScaleElements(s);
		_BookmarkBox.ScaleColumnWidths(s);
		_ViewerToolbar.Left = _BookmarkToolbar.Right;
		_MainPanel.SplitterDistance = (int)(_MainPanel.SplitterDistance * FormHelper.GetDpiScale(this));
		_MainPanel.FixedPanel = FixedPanel.Panel1;
		//_MainToolbar.ToggleEnabled (false, _editButtonNames);

		CreateChangeZoomRateItems();

		_ChangeZoomRate.DropDownItemClicked += _MainToolbar_ItemClicked;
		_ChangeCase.DropDownItemClicked += (object s, ToolStripItemClickedEventArgs args) => {
			args.ClickedItem.HidePopupMenu();
			_EditMenu.Hide();
			var i = Array.IndexOf(SetCaseProcessor.CaseNames, args.ClickedItem.Text);
			if (i != -1) {
				_controller.ProcessBookmarks(new SetCaseProcessor((SetCaseProcessor.LetterCase)i));
			}
		};
		foreach (int item in Enum.GetValues(typeof(SetCaseProcessor.LetterCase))) {
			_ChangeCase.DropDownItems.Add(SetCaseProcessor.CaseNames[item]);
		}
		_SetOpenStatus.DropDownItemClicked += _MainToolbar_ItemClicked;

		AppContext.MainForm.SetTooltip(_IncludeDecendantBox, "选中此选项后，加粗、斜体等其它修改书签的操作将应用到选中书签的子书签");
		_IncludeDecendantBox.CheckedChanged += (s, args) => _BookmarkBox.OperationAffectsDescendants = _IncludeDecendantBox.Checked;

		_UndoButton.DropDownOpening += (object s, EventArgs args) => {
			var mi = _UndoMenu.Items;
			mi.Clear();
			foreach (var item in _controller.Model.Undo.GetActionNames(16)) {
				mi.Add(item);
			}
		};
		_UndoButton.DropDownItemClicked += (s, args) => _controller.Undo(args.ClickedItem.Owner.Items.IndexOf(args.ClickedItem) + 1);
		QuickSelectCommand.RegisterMenuItems(_QuickSelect.DropDownItems);
		_ViewerButton.DropDownOpening += (s, args) => SetupMenu(_ViewerButton.DropDownItems);
		_OcrMenu.DropDownItemClicked += (s, args) => _ViewerBox.OcrLanguage = (int)(args.ClickedItem.Tag ?? 0);
		_OcrMenu.DropDownOpening += (s, args) => {
			var m = _OcrMenu.DropDownItems;
			if (m.Count == 1) {
				for (int i = 0; i < Constants.Ocr.LangIDs.Length; i++) {
					var item = new ToolStripMenuItem(Constants.Ocr.LangNames[i]);
					m.Add(item);
					item.Tag = Constants.Ocr.LangIDs[i];
					item.Enabled = ModiOcr.IsLanguageInstalled(Constants.Ocr.LangIDs[i]);
				}
			}
			foreach (ToolStripMenuItem item in _OcrMenu.DropDownItems) {
				item.Checked = _ViewerBox.OcrLanguage == (int)(item.Tag ?? 0);
			}
		};
		_ZoomBox.Items.AddRange(ReaderOptions.ZoomModes);
		_ZoomBox.Enabled = false;
		_ZoomBox.TextChanged += (s, args) => _ViewerBox.LiteralZoom = _ZoomBox.Text;
		_ViewerBox.Enabled = false;
		_ViewerBox.ApplyOptions(AppContext.Reader);
		_ViewerBox.DocumentLoaded += _ViewerBoxInitializeAfterDocumentLoad;
		_ViewerBox.ZoomChanged += (s, args) => {
			_ZoomBox.ToolTipText = "当前显示比例：" + (_ViewerBox.ZoomFactor * 100).ToInt32() + "%";
			_ZoomBox.Text = _ViewerBox.LiteralZoom;
		};
		//_ViewerBox.SelectionChanged += (s, args) =>
		//{
		//	var t = args.Selection.SelectedText;
		//	if (String.IsNullOrEmpty (t) == false) {
		//		var p = _ViewerBox.ViewBox.SelectionRegion;
		//        ShowInsertBookmarkDialog (_ViewerBox.ViewBox.PointToClient (MousePosition), _ViewerBox.MapPositionFromImagePoint (p.Left.ToInt32 (), p.Top.ToInt32 ()), t);
		//	}
		//};
		//_ViewerBox.MouseMode = MouseMode.Selection;
		_ViewerBox.MouseClick += _ViewBox_MouseClick;
		_ViewerToolbar.Enabled = false;

		Disposed += (s, args) => _controller.Destroy();
	}

	void CreateChangeZoomRateItems() {
		var di = _ChangeZoomRate.DropDownItems;
		di.AddRange(Array.ConvertAll(Constants.DestinationAttributes.ViewType.Names, n => new ToolStripMenuItem { Name = n, Text = n }));
		di.RemoveByKey(Constants.DestinationAttributes.ViewType.FitR);
		di[0].Text += "...";
		di.Insert(0, new ToolStripMenuItem { Name = Constants.Coordinates.Unchanged, Text = Constants.Coordinates.Unchanged });
		for (int i = 0; i < di.Count; i++) {
			di[i].Text += $"(&{i})";
		}
	}

	void _ViewerBoxInitializeAfterDocumentLoad(object sender, EventArgs e) {
		_controller.ExecuteCommand(EditorCommands.ApplyOptions);
		_ZoomBox.Text = _ViewerBox.LiteralZoom;
		_ZoomBox.Enabled = true;
		_ViewerBox.ScrollToPage(1);
	}

	void _ViewBox_MouseClick(object sender, MouseEventArgs args) {
		if (_ViewerBox.FirstPage == 0) {
			return;
		}
		var l = args.Location;
		if (args.Button != MouseButtons.Right) {
			return;
		}

		_ViewerBox.PinPoint = _ViewerBox.PointToImage(l);
		SetupMenu(_ViewerMenu.Items);
		_ViewerMenu.Show(_ViewerBox, l);
		if (!_ViewerBox.IsClientPointInSelection(l)) {
			_ViewerBox.SelectNone();
		}
	}

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

	void ButtonClicked(object sender, EventArgs e) {
		if (sender == _UndoButton) {
			_controller.Undo(1);
		}
		else if (sender == _AddFilesButton) {
			ExecuteCommand(Commands.Open);
		}
	}

	public override void SetupCommand(ToolStripItem item) {
		var n = item.Name;
		var l = _controller.Model.DocumentPath != null;
		var m = item as ToolStripMenuItem;
		if (_controller.Model.IsLoadingDocument) {
			item.Enabled = false;
			return;
		}
		switch (n) {
			case Commands.Action:
				EnableCommand(item, l, true);
				item.ToolTipText = "将书签和编辑结果写入到 PDF 文件中";
				break;
			case Commands.SaveBookmark:
			case Commands.SaveAsInfoFile:
				EnableCommand(item, l, true);
				break;
			case Commands.SelectAllFolders:
			case Commands.SelectAllImages:
			case Commands.SelectAllPdf:
			case Commands.ItemTypeSeparator:
				EnableCommand(item, false, false);
				break;
			case Commands.ResetOptions:
				// keep disabled
				break;
			case Commands.DocumentProperties:
				item.Enabled = _ViewerBox.Document != null && !_ViewerBox.Document.IsDisposed;
				item.Visible = true;
				break;
			case EditorCommands.ScrollVertical: m.Checked = _ViewerBox.ContentDirection == ContentDirection.TopToDown; break;
			case EditorCommands.ScrollHorizontal: m.Checked = _ViewerBox.ContentDirection == ContentDirection.RightToLeft; break;
			case EditorCommands.ScrollHorizontalLeftToRight: m.Checked = _ViewerBox.ContentDirection == ContentDirection.LeftToRight; break;
			case EditorCommands.TrueColorSpace: m.Checked = !_ViewerBox.GrayScale; break;
			case EditorCommands.GrayColorSpace: m.Checked = _ViewerBox.GrayScale; break;
			case EditorCommands.InvertColor: m.Checked = _ViewerBox.InvertColor; break;
			case EditorCommands.MoveMode: m.Checked = _ViewerBox.MouseMode == MouseMode.Move; break;
			case EditorCommands.SelectionMode: m.Checked = _ViewerBox.MouseMode == MouseMode.Selection; break;
			case EditorCommands.FullPageScroll: m.Checked = _ViewerBox.FullPageScroll; break;
			case EditorCommands.ShowTextBorders: m.Checked = _ViewerBox.ShowTextBorders; break;
			case EditorCommands.DarkMode: m.Checked = _ViewerBox.TintColor == __DarkModeColor; break;
			case EditorCommands.GreenMode: m.Checked = _ViewerBox.TintColor == __GreenModeColor; break;
			case EditorCommands.ShowAnnotations: m.Checked = !_ViewerBox.HideAnnotations; break;
			case EditorCommands.ShowBookmarks: m.Checked = !_MainPanel.Panel1Collapsed; break;
			case EditorCommands.OcrPage: item.Enabled = ModiOcr.ModiInstalled && _ViewerBox.OcrLanguage != Constants.Ocr.NoLanguage; break;
			case "_OcrDetectPunctuation":
				item.Enabled = ModiOcr.ModiInstalled && _ViewerBox.OcrLanguage != Constants.Ocr.NoLanguage;
				m.Checked = _ViewerBox.OcrOptions.DetectContentPunctuations;
				break;
			case "_InsertWithOcrOnly":
				m.Checked = _controller.Model.InsertBookmarkWithOcrOnly;
				break;
			case "_EnableOcr":
				item.Enabled = ModiOcr.ModiInstalled;
				item.ToolTipText = item.Enabled ? String.Empty : Messages.ModiNotAvailable;
				break;
			case "_OcrDisabled":
				m.Checked = _ViewerBox.OcrLanguage == Constants.Ocr.NoLanguage;
				break;
			case "_CopySelection":
				item.Enabled = _ViewerBox.SelectionRegion.Contains(_ViewerBox.PinPoint);
				break;
			case "_AutoBookmark":
				if (m.DropDownItems.Count == 0) {
					m.DropDownItemClicked += _MainToolbar_ItemClicked;
					for (int i = 1; i < 8; i++) {
						m.DropDownItems.Add(new ToolStripMenuItem($"&{i} 级标题") { Name = "_AutoBookmarkLevel" + i });
					}
				}
				break;
			default:
				EnableCommand(item, true, true);
				break;
		}
		base.SetupCommand(item);
	}

	public override void ExecuteCommand(string cmd, params string[] parameters) {
		switch (cmd) {
			#region 书签命令
			case "_InsertBookmark":
				_controller.InsertBookmark();
				break;
			case "_MergeBookmark":
				_controller.MergeBookmark(_BookmarkBox.GetSelectedElements());
				break;
			#endregion
			#region 阅读器工具栏命令
			case "_AutoBookmark":
				_controller.ShowAutoBookmarkForm();
				break;
			case "_InsertWithOcrOnly":
				_controller.Model.InsertBookmarkWithOcrOnly = !_controller.Model.InsertBookmarkWithOcrOnly;
				break;
			#endregion
			default:
				if (cmd.HasPrefix("_AutoBookmarkLevel")) {
					_controller.ConfigAutoBookmarkTextStyles(
						cmd.Substring("_AutoBookmarkLevel".Length).ToInt32(),
						_ViewerBox.FindTextLines(_ViewerBox.TransposeVirtualImageToPagePosition(_ViewerBox.PinPoint.X, _ViewerBox.PinPoint.Y)));
					break;
				}
				_controller.ExecuteCommand(cmd, parameters);
				break;
		}
	}

	public void CloseDocument() {
		_ViewerBox.CloseFile();
	}

	public void Reopen() {
		_ViewerBox.Reopen();
	}

	void _BookmarkColorButton_SelectedColorChanged(object sender, EventArgs e) {
		var c = _BookmarkColorButton.Color;
		_controller.ProcessBookmarks(new SetTextColorProcessor(c));
	}

	void _OpenButton_DropDownOpening(object sender, EventArgs e) {
		var m = (sender as ToolStripDropDownItem);
		var l = m.DropDown.Items;
		l.ClearDropDownItems();
		l.AddSourcePdfFiles();
		if (l.Count > 0) {
			l.Add(new ToolStripSeparator());
		}
		l.AddInfoFiles();
	}

	void _OpenButton_DropDownItemClicked(object sender, ToolStripItemClickedEventArgs e) {
		e.ClickedItem.HidePopupMenu();
		ExecuteCommand(Commands.OpenFile, e.ClickedItem.ToolTipText);
	}

	[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
	protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
		if (_BookmarkBox.IsCellEditing || _CurrentPageBox.Focused) {
			return base.ProcessCmdKey(ref msg, keyData);
		}
		switch (keyData ^ Keys.Control) {
			case Keys.B:
				ExecuteCommand("_BookmarkBoldButton"); return true;
			case Keys.I:
				ExecuteCommand("_BookmarkItalicButton"); return true;
			case Keys.Z: _controller.Undo(1); return true;
			case Keys.F:
				ExecuteCommand("_SearchReplace"); return true;
			case Keys.R:
				ExecuteCommand(Commands.ImportBookmark); return true;
			case Keys.Q:
				ExecuteCommand(Commands.SaveBookmark); return true;
			case Keys.S:
				ExecuteCommand(Commands.Action); return true;
			case Keys.O:
				ExecuteCommand(Commands.Open); return true;
			case Keys.C:
				ExecuteCommand(Commands.Copy); return true;
			case Keys.V:
				ExecuteCommand(Commands.Paste); return true;
			case Keys.W:
				ExecuteCommand(Commands.EditorBookmarkSetCurrentCoordinates);
				return true;
			case Keys.Alt | Keys.W:
				ExecuteCommand(Commands.EditorBookmarkSetCurrentCoordinates);
				_controller.View.Bookmark.SelectNext();
				return true;
			case Keys.Down:
				_controller.InsertBookmark(InsertBookmarkPositionType.AfterCurrent);
				return true;
			case Keys.Up:
				_controller.InsertBookmark(InsertBookmarkPositionType.BeforeCurrent);
				return true;
			case Keys.Right:
				_controller.InsertBookmark(InsertBookmarkPositionType.AsChild);
				return true;
			case Keys.Left:
				_controller.InsertBookmark(InsertBookmarkPositionType.AfterParent);
				return true;
		}
		switch (keyData ^ Keys.Shift) {
			case Keys.Tab:
				ExecuteCommand("_LevelUp"); return true;
			case Keys.D8:
				ExecuteCommand("_ShiftMultiPageNumber"); return true;
			case Keys.Up:
				_controller.View.Bookmark.SelectPrevious(); return true;
			case Keys.Down:
				_controller.View.Bookmark.SelectNext(); return true;
			case Keys.Right:
				_controller.View.Bookmark.ExpandSelected(true); return true;
			case Keys.Left:
				_controller.View.Bookmark.CollapseSelected(true); return true;
			case Keys.Enter:
				_controller.ExecuteCommand(Commands.EditorViewerScrollToBookmark); return true;
		}
		switch (keyData) {
			case Keys.Insert:
				_controller.InsertBookmark(); return true;
			case Keys.Delete:
				ExecuteCommand(Commands.Delete); return true;
			case Keys.Add:
			case Keys.Oemplus:
				ExecuteCommand("_IncrementPageNumber"); return true;
			case Keys.Subtract:
			case Keys.OemMinus:
				ExecuteCommand("_DecrementPageNumber"); return true;
			case Keys.Multiply:
				ExecuteCommand("_ShiftMultiPageNumber"); return true;
			case Keys.P:
				if (_BookmarkBox.FocusedItem != null) {
					_BookmarkBox.EditSubItem(_BookmarkBox.FocusedItem as BrightIdeasSoftware.OLVListItem, _BookmarkBox.BookmarkPageColumn.Index);
				}
				return true;
			case Keys.Tab:
				ExecuteCommand("_LevelDown"); return true;
			case Keys.F2:
				if (_BookmarkBox.FocusedItem != null) {
					_BookmarkBox.FocusedItem.BeginEdit();
				}
				else {
					_BookmarkBox.SelectedItem?.BeginEdit();
				}
				return true;
			case Keys.Space:
				if (_BookmarkBox.FocusedItem != null) {
					_ViewerBox.CurrentPageNumber = (_BookmarkBox.FocusedObject as BookmarkElement).Page;
				}
				return true;
			case Keys.ProcessKey:
			case Keys.Oem4:
			case Keys.Oem6:
				if (msg.Msg == 256) {
					switch ((int)msg.LParam) {
						case 0x001A0001:
							ExecuteCommand("_PreviousPage");
							return true;
						case 0x001B0001:
							ExecuteCommand("_NextPage");
							return true;
					}
				}
				break;
		}

		return base.ProcessCmdKey(ref msg, keyData);
	}

	void _BookmarkBox_DragEnter(object sender, DragEventArgs e) {
		e.FeedbackDragFileOver(Constants.FileExtensions.PdfAndAllBookmarkExtension);
	}

	void _BookmarkBox_DragDrop(object sender, DragEventArgs e) {
		if (this.DropFileOver(e, Constants.FileExtensions.PdfAndAllBookmarkExtension)
			&& (!_controller.Model.Undo.IsDirty
				|| AppContext.MainForm.ConfirmYesBox(Messages.ConfirmAbandonDocument))) {
			_controller.LoadDocument(Text, false);
		}
	}

	#region IEditView
	bool IEditView.AffectsDescendantBookmarks => _IncludeDecendantBox.Checked || ModifierKeys == Keys.Shift;

	ToolStripSplitButton IEditView.UndoButton => _UndoButton;

	AutoBookmarkForm IEditView.AutoBookmark {
		get {
			if (_autoBookmarkForm?.IsDisposed != false) {
				_autoBookmarkForm = new AutoBookmarkForm(_controller);
			}
			return _autoBookmarkForm;
		}
	}

	BookmarkEditorView IEditView.Bookmark => _BookmarkBox;

	ViewerControl IEditView.Viewer => _ViewerBox;

	ToolStrip IEditView.ViewerToolbar => _ViewerToolbar;

	ToolStrip IEditView.BookmarkToolbar => _BookmarkToolbar;

	SplitContainer IEditView.MainPanel => _MainPanel;

	#endregion
}