// <file>
//     <copyright see="prj:///doc/copyright.txt"/>
//     <license see="prj:///doc/license.txt"/>
//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
//     <version>$Revision$</version>
// </file>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Text;
using System.IO;
using System.Text;
using System.Windows.Forms;

using ICSharpCode.TextEditor.Actions;
using ICSharpCode.TextEditor.Document;

namespace ICSharpCode.TextEditor
{
	/// <summary>
	/// This class is used for a basic text area control
	/// </summary>
	[ToolboxItem(false)]
	public abstract class TextEditorControlBase : UserControl
	{
		string    currentFileName = null;
		int       updateLevel     = 0;
		IDocument document;
		
		/// <summary>
		/// This hashtable contains all editor keys, where
		/// the key is the key combination and the value the
		/// action.
		/// </summary>
		protected Dictionary<Keys, IEditAction> editactions = new Dictionary<Keys, IEditAction>();
		
		[Browsable(false)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
		public ITextEditorProperties TextEditorProperties {
			get {
				return document.TextEditorProperties;
			}
			set {
				document.TextEditorProperties = value;
				OptionsChanged();
			}
		}
		
		Encoding encoding;
		
		/// <value>
		/// Current file's character encoding
		/// </value>
		[Browsable(false)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
		public Encoding Encoding {
			get {
				if (encoding == null)
					return TextEditorProperties.Encoding;
				return encoding;
			}
			set {
				encoding = value;
			}
		}
		
		/// <value>
		/// The current file name
		/// </value>
		[Browsable(false)]
		[ReadOnly(true)]
		public string FileName {
			get {
				return currentFileName;
			}
			set {
				if (currentFileName != value) {
					currentFileName = value;
					OnFileNameChanged(EventArgs.Empty);
				}
			}
		}
		
		/// <value>
		/// The current document
		/// </value>
		[Browsable(false)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
		public IDocument Document {
			get {
				return document;
			}
			set {
				if (value == null)
					throw new ArgumentNullException("value");
				if (document != null) {
					document.DocumentChanged -= OnDocumentChanged;
				}
				document = value;
				document.UndoStack.TextEditorControl = this;
				document.DocumentChanged += OnDocumentChanged;
			}
		}
		
		void OnDocumentChanged(object sender, EventArgs e)
		{
			OnTextChanged(e);
		}
		
		[EditorBrowsable(EditorBrowsableState.Always), Browsable(true)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
		[Editor("System.ComponentModel.Design.MultilineStringEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(System.Drawing.Design.UITypeEditor))]
		public override string Text {
			get {
				return Document.TextContent;
			}
			set {
				Document.TextContent = value;
			}
		}
		
		[EditorBrowsable(EditorBrowsableState.Always), Browsable(true)]
		public new event EventHandler TextChanged
		{
			add { base.TextChanged += value; }
			remove { base.TextChanged -= value; }
		}
		
		static Font ParseFont(string font)
		{
			string[] descr = font.Split(new char[]{',', '='});
			return new Font(descr[1], Single.Parse(descr[3]));
		}
		
		/// <value>
		/// If set to true the contents can't be altered.
		/// </value>
		[Browsable(false)]
		public bool IsReadOnly {
			get {
				return Document.ReadOnly;
			}
			set {
				Document.ReadOnly = value;
			}
		}
		
		/// <value>
		/// true, if the textarea is updating it's status, while
		/// it updates it status no redraw operation occurs.
		/// </value>
		[Browsable(false)]
		public bool IsInUpdate {
			get {
				return updateLevel > 0;
			}
		}
		
		/// <value>
		/// supposedly this is the way to do it according to .NET docs,
		/// as opposed to setting the size in the constructor
		/// </value>
		protected override Size DefaultSize {
			get {
				return new Size(100, 100);
			}
		}
		
		#region Document Properties
		/// <value>
		/// If true spaces are shown in the textarea
		/// </value>
		[Category("Appearance")]
		[DefaultValue(false)]
		[Description("If true spaces are shown in the textarea")]
		public bool ShowSpaces {
			get {
				return document.TextEditorProperties.ShowSpaces;
			}
			set {
				document.TextEditorProperties.ShowSpaces = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// Specifies the quality of text rendering (whether to use hinting and/or anti-aliasing).
		/// </value>
		[Category("Appearance")]
		[DefaultValue(TextRenderingHint.SystemDefault)]
		[Description("Specifies the quality of text rendering (whether to use hinting and/or anti-aliasing).")]
		public TextRenderingHint TextRenderingHint {
			get {
				return document.TextEditorProperties.TextRenderingHint;
			}
			set {
				document.TextEditorProperties.TextRenderingHint = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// If true tabs are shown in the textarea
		/// </value>
		[Category("Appearance")]
		[DefaultValue(false)]
		[Description("If true tabs are shown in the textarea")]
		public bool ShowTabs {
			get {
				return document.TextEditorProperties.ShowTabs;
			}
			set {
				document.TextEditorProperties.ShowTabs = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// If true EOL markers are shown in the textarea
		/// </value>
		[Category("Appearance")]
		[DefaultValue(false)]
		[Description("If true EOL markers are shown in the textarea")]
		public bool ShowEOLMarkers {
			get {
				return document.TextEditorProperties.ShowEOLMarker;
			}
			set {
				document.TextEditorProperties.ShowEOLMarker = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// If true the horizontal ruler is shown in the textarea
		/// </value>
		[Category("Appearance")]
		[DefaultValue(false)]
		[Description("If true the horizontal ruler is shown in the textarea")]
		public bool ShowHRuler {
			get {
				return document.TextEditorProperties.ShowHorizontalRuler;
			}
			set {
				document.TextEditorProperties.ShowHorizontalRuler = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// If true the vertical ruler is shown in the textarea
		/// </value>
		[Category("Appearance")]
		[DefaultValue(true)]
		[Description("If true the vertical ruler is shown in the textarea")]
		public bool ShowVRuler {
			get {
				return document.TextEditorProperties.ShowVerticalRuler;
			}
			set {
				document.TextEditorProperties.ShowVerticalRuler = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// The row in which the vertical ruler is displayed
		/// </value>
		[Category("Appearance")]
		[DefaultValue(80)]
		[Description("The row in which the vertical ruler is displayed")]
		public int VRulerRow {
			get {
				return document.TextEditorProperties.VerticalRulerRow;
			}
			set {
				document.TextEditorProperties.VerticalRulerRow = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// If true line numbers are shown in the textarea
		/// </value>
		[Category("Appearance")]
		[DefaultValue(true)]
		[Description("If true line numbers are shown in the textarea")]
		public bool ShowLineNumbers {
			get {
				return document.TextEditorProperties.ShowLineNumbers;
			}
			set {
				document.TextEditorProperties.ShowLineNumbers = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// If true invalid lines are marked in the textarea
		/// </value>
		[Category("Appearance")]
		[DefaultValue(false)]
		[Description("If true invalid lines are marked in the textarea")]
		public bool ShowInvalidLines {
			get {
				return document.TextEditorProperties.ShowInvalidLines;
			}
			set {
				document.TextEditorProperties.ShowInvalidLines = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// If true folding is enabled in the textarea
		/// </value>
		[Category("Appearance")]
		[DefaultValue(true)]
		[Description("If true folding is enabled in the textarea")]
		public bool EnableFolding {
			get {
				return document.TextEditorProperties.EnableFolding;
			}
			set {
				document.TextEditorProperties.EnableFolding = value;
				OptionsChanged();
			}
		}
		
		[Category("Appearance")]
		[DefaultValue(true)]
		[Description("If true matching brackets are highlighted")]
		public bool ShowMatchingBracket {
			get {
				return document.TextEditorProperties.ShowMatchingBracket;
			}
			set {
				document.TextEditorProperties.ShowMatchingBracket = value;
				OptionsChanged();
			}
		}
		
		[Category("Appearance")]
		[DefaultValue(false)]
		[Description("If true the icon bar is displayed")]
		public bool IsIconBarVisible {
			get {
				return document.TextEditorProperties.IsIconBarVisible;
			}
			set {
				document.TextEditorProperties.IsIconBarVisible = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// The width in spaces of a tab character
		/// </value>
		[Category("Appearance")]
		[DefaultValue(4)]
		[Description("The width in spaces of a tab character")]
		public int TabIndent {
			get {
				return document.TextEditorProperties.TabIndent;
			}
			set {
				document.TextEditorProperties.TabIndent = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// The line viewer style
		/// </value>
		[Category("Appearance")]
		[DefaultValue(LineViewerStyle.None)]
		[Description("The line viewer style")]
		public LineViewerStyle LineViewerStyle {
			get {
				return document.TextEditorProperties.LineViewerStyle;
			}
			set {
				document.TextEditorProperties.LineViewerStyle = value;
				OptionsChanged();
			}
		}

		/// <value>
		/// The indent style
		/// </value>
		[Category("Behavior")]
		[DefaultValue(IndentStyle.Smart)]
		[Description("The indent style")]
		public IndentStyle IndentStyle {
			get {
				return document.TextEditorProperties.IndentStyle;
			}
			set {
				document.TextEditorProperties.IndentStyle = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// if true spaces are converted to tabs
		/// </value>
		[Category("Behavior")]
		[DefaultValue(false)]
		[Description("Converts tabs to spaces while typing")]
		public bool ConvertTabsToSpaces {
			get {
				return document.TextEditorProperties.ConvertTabsToSpaces;
			}
			set {
				document.TextEditorProperties.ConvertTabsToSpaces = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// if true spaces are converted to tabs
		/// </value>
		[Category("Behavior")]
		[DefaultValue(false)]
		[Description("Hide the mouse cursor while typing")]
		public bool HideMouseCursor {
			get {
				return document.TextEditorProperties.HideMouseCursor;
			}
			set {
				document.TextEditorProperties.HideMouseCursor = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// if true spaces are converted to tabs
		/// </value>
		[Category("Behavior")]
		[DefaultValue(false)]
		[Description("Allows the caret to be placed beyond the end of line")]
		public bool AllowCaretBeyondEOL {
			get {
				return document.TextEditorProperties.AllowCaretBeyondEOL;
			}
			set {
				document.TextEditorProperties.AllowCaretBeyondEOL = value;
				OptionsChanged();
			}
		}
		/// <value>
		/// if true spaces are converted to tabs
		/// </value>
		[Category("Behavior")]
		[DefaultValue(BracketMatchingStyle.After)]
		[Description("Specifies if the bracket matching should match the bracket before or after the caret.")]
		public BracketMatchingStyle BracketMatchingStyle {
			get {
				return document.TextEditorProperties.BracketMatchingStyle;
			}
			set {
				document.TextEditorProperties.BracketMatchingStyle = value;
				OptionsChanged();
			}
		}
		
		/// <value>
		/// The base font of the text area. No bold or italic fonts
		/// can be used because bold/italic is reserved for highlighting
		/// purposes.
		/// </value>
		[Browsable(true)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
		[Description("The base font of the text area. No bold or italic fonts can be used because bold/italic is reserved for highlighting purposes.")]
		public override Font Font {
			get {
				return document.TextEditorProperties.Font;
			}
			set {
				document.TextEditorProperties.Font = value;
				OptionsChanged();
			}
		}
		
		#endregion
		public abstract TextAreaControl ActiveTextAreaControl {
			get;
		}
		
		protected TextEditorControlBase()
		{
			GenerateDefaultActions();
			HighlightingManager.Manager.ReloadSyntaxHighlighting += new EventHandler(OnReloadHighlighting);
		}
		
		protected virtual void OnReloadHighlighting(object sender, EventArgs e)
		{
			if (Document.HighlightingStrategy != null) {
				try {
					Document.HighlightingStrategy = HighlightingStrategyFactory.CreateHighlightingStrategy(Document.HighlightingStrategy.Name);
				} catch (HighlightingDefinitionInvalidException ex) {
					MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
				}
				OptionsChanged();
			}
		}
		
		public bool IsEditAction(Keys keyData)
		{
			return editactions.ContainsKey(keyData);
		}
		
		internal IEditAction GetEditAction(Keys keyData)
		{
			if (!IsEditAction(keyData)) {
				return null;
			}
			return (IEditAction)editactions[keyData];
		}

		void GenerateDefaultActions()
		{
			editactions[Keys.Left] = new CaretLeft();
			editactions[Keys.Left | Keys.Shift] = new ShiftCaretLeft();
			editactions[Keys.Left | Keys.Control] = new WordLeft();
			editactions[Keys.Left | Keys.Control | Keys.Shift] = new ShiftWordLeft();
			editactions[Keys.Right] = new CaretRight();
			editactions[Keys.Right | Keys.Shift] = new ShiftCaretRight();
			editactions[Keys.Right | Keys.Control] = new WordRight();
			editactions[Keys.Right | Keys.Control | Keys.Shift] = new ShiftWordRight();
			editactions[Keys.Up] = new CaretUp();
			editactions[Keys.Up | Keys.Shift] = new ShiftCaretUp();
			editactions[Keys.Up | Keys.Control] = new ScrollLineUp();
			editactions[Keys.Down] = new CaretDown();
			editactions[Keys.Down | Keys.Shift] = new ShiftCaretDown();
			editactions[Keys.Down | Keys.Control] = new ScrollLineDown();
			
			editactions[Keys.Insert] = new ToggleEditMode();
			editactions[Keys.Insert | Keys.Control] = new Copy();
			editactions[Keys.Insert | Keys.Shift] = new Paste();
			editactions[Keys.Delete] = new Delete();
			editactions[Keys.Delete | Keys.Shift] = new Cut();
			editactions[Keys.Home] = new Home();
			editactions[Keys.Home | Keys.Shift] = new ShiftHome();
			editactions[Keys.Home | Keys.Control] = new MoveToStart();
			editactions[Keys.Home | Keys.Control | Keys.Shift] = new ShiftMoveToStart();
			editactions[Keys.End] = new End();
			editactions[Keys.End | Keys.Shift] = new ShiftEnd();
			editactions[Keys.End | Keys.Control] = new MoveToEnd();
			editactions[Keys.End | Keys.Control | Keys.Shift] = new ShiftMoveToEnd();
			editactions[Keys.PageUp] = new MovePageUp();
			editactions[Keys.PageUp | Keys.Shift] = new ShiftMovePageUp();
			editactions[Keys.PageDown] = new MovePageDown();
			editactions[Keys.PageDown | Keys.Shift] = new ShiftMovePageDown();
			
			editactions[Keys.Return] = new Return();
			editactions[Keys.Tab] = new Tab();
			editactions[Keys.Tab | Keys.Shift] = new ShiftTab();
			editactions[Keys.Back] = new Backspace();
			editactions[Keys.Back | Keys.Shift] = new Backspace();
			
			editactions[Keys.X | Keys.Control] = new Cut();
			editactions[Keys.C | Keys.Control] = new Copy();
			editactions[Keys.V | Keys.Control] = new Paste();
			
			editactions[Keys.A | Keys.Control] = new SelectWholeDocument();
			editactions[Keys.Escape] = new ClearAllSelections();
			
			editactions[Keys.Divide | Keys.Control] = new ToggleComment();
			editactions[Keys.OemQuestion | Keys.Control] = new ToggleComment();
			
			editactions[Keys.Back | Keys.Alt]  = new Actions.Undo();
			editactions[Keys.Z | Keys.Control] = new Actions.Undo();
			editactions[Keys.Y | Keys.Control] = new Redo();
			
			editactions[Keys.Delete | Keys.Control] = new DeleteWord();
			editactions[Keys.Back | Keys.Control]   = new WordBackspace();
			editactions[Keys.D | Keys.Control]      = new DeleteLine();
			editactions[Keys.D | Keys.Shift | Keys.Control]      = new DeleteToLineEnd();
			
			editactions[Keys.B | Keys.Control]      = new GotoMatchingBrace();
		}
		
		/// <remarks>
		/// Call this method before a long update operation this
		/// 'locks' the text area so that no screen update occurs.
		/// </remarks>
		public virtual void BeginUpdate()
		{
			++updateLevel;
		}
		
		/// <remarks>
		/// Call this method to 'unlock' the text area. After this call
		/// screen update can occur. But no automatical refresh occurs you
		/// have to commit the updates in the queue.
		/// </remarks>
		public virtual void EndUpdate()
		{
			Debug.Assert(updateLevel > 0);
			updateLevel = Math.Max(0, updateLevel - 1);
		}
		
		public void LoadFile(string fileName)
		{
			LoadFile(fileName, true, true);
		}
		
		/// <remarks>
		/// Loads a file given by fileName
		/// </remarks>
		/// <param name="fileName">The name of the file to open</param>
		/// <param name="autoLoadHighlighting">Automatically load the highlighting for the file</param>
		/// <param name="autodetectEncoding">Automatically detect file encoding and set Encoding property to the detected encoding.</param>
		public void LoadFile(string fileName, bool autoLoadHighlighting, bool autodetectEncoding)
		{
			using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read)) {
				LoadFile(fileName, fs, autoLoadHighlighting, autodetectEncoding);
			}
		}
		
		/// <remarks>
		/// Loads a file from the specified stream.
		/// </remarks>
		/// <param name="fileName">The name of the file to open. Used to find the correct highlighting strategy
		/// if autoLoadHighlighting is active, and sets the filename property to this value.</param>
		/// <param name="stream">The stream to actually load the file content from.</param>
		/// <param name="autoLoadHighlighting">Automatically load the highlighting for the file</param>
		/// <param name="autodetectEncoding">Automatically detect file encoding and set Encoding property to the detected encoding.</param>
		public void LoadFile(string fileName, Stream stream, bool autoLoadHighlighting, bool autodetectEncoding)
		{
			if (stream == null)
				throw new ArgumentNullException("stream");
			
			BeginUpdate();
			document.TextContent = String.Empty;
			document.UndoStack.ClearAll();
			document.BookmarkManager.Clear();
			if (autoLoadHighlighting) {
				try {
					document.HighlightingStrategy = HighlightingStrategyFactory.CreateHighlightingStrategyForFile(fileName);
				} catch (HighlightingDefinitionInvalidException ex) {
					MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
				}
			}
			
			if (autodetectEncoding) {
				Encoding encoding = this.Encoding;
				Document.TextContent = Util.FileReader.ReadFileContent(stream, ref encoding);
				this.Encoding = encoding;
			} else {
				using (StreamReader reader = new StreamReader(fileName, this.Encoding)) {
					Document.TextContent = reader.ReadToEnd();
				}
			}
			
			this.FileName = fileName;
			Document.UpdateQueue.Clear();
			EndUpdate();
			
			OptionsChanged();
			Refresh();
		}
		
		/// <summary>
		/// Gets if the document can be saved with the current encoding without losing data.
		/// </summary>
		public bool CanSaveWithCurrentEncoding()
		{
			if (encoding == null || Util.FileReader.IsUnicode(encoding))
				return true;
			// not a unicode codepage
			string text = document.TextContent;
			return encoding.GetString(encoding.GetBytes(text)) == text;
		}
		
		/// <remarks>
		/// Saves the text editor content into the file.
		/// </remarks>
		public void SaveFile(string fileName)
		{
			using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write)) {
				SaveFile(fs);
			}
			this.FileName = fileName;
		}
		
		/// <remarks>
		/// Saves the text editor content into the specified stream.
		/// Does not close the stream.
		/// </remarks>
		public void SaveFile(Stream stream)
		{
			StreamWriter streamWriter = new StreamWriter(stream, this.Encoding ?? Encoding.UTF8);
			
			// save line per line to apply the LineTerminator to all lines
			// (otherwise we might save files with mixed-up line endings)
			foreach (LineSegment line in Document.LineSegmentCollection) {
				streamWriter.Write(Document.GetText(line.Offset, line.Length));
				if (line.DelimiterLength > 0) {
					char charAfterLine = Document.GetCharAt(line.Offset + line.Length);
					if (charAfterLine != '\n' && charAfterLine != '\r')
						throw new InvalidOperationException("The document cannot be saved because it is corrupted.");
					// only save line terminator if the line has one
					streamWriter.Write(document.TextEditorProperties.LineTerminator);
				}
			}
			streamWriter.Flush();
		}
		
		public abstract void OptionsChanged();
		
		// Localization ISSUES
		
		// used in insight window
		public virtual string GetRangeDescription(int selectedItem, int itemCount)
		{
			StringBuilder sb=new StringBuilder(selectedItem.ToString());
			sb.Append(" from ");
			sb.Append(itemCount.ToString());
			return sb.ToString();
		}
		
		/// <remarks>
		/// Overwritten refresh method that does nothing if the control is in
		/// an update cycle.
		/// </remarks>
		public override void Refresh()
		{
			if (IsInUpdate) {
				return;
			}
			base.Refresh();
		}
		
		protected override void Dispose(bool disposing)
		{
			if (disposing) {
				HighlightingManager.Manager.ReloadSyntaxHighlighting -= new EventHandler(OnReloadHighlighting);
				document.HighlightingStrategy = null;
				document.UndoStack.TextEditorControl = null;
			}
			base.Dispose(disposing);
		}
		
		protected virtual void OnFileNameChanged(EventArgs e)
		{
			if (FileNameChanged != null) {
				FileNameChanged(this, e);
			}
		}
		
		public event EventHandler FileNameChanged;
	}
}