// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Windows.Media;
using ICSharpCode.Core;
using ICSharpCode.NRefactory;
using ICSharpCode.SharpDevelop.Bookmarks;
using ICSharpCode.SharpDevelop.Editor;
using ICSharpCode.SharpDevelop.Gui;

namespace ICSharpCode.SharpDevelop.Debugging
{
	public class CurrentLineBookmark : SDMarkerBookmark
	{
		static object syncObject = new object();
		static CurrentLineBookmark instance;
		
		static int startLine;
		static int startColumn;
		static int endLine;
		static int endColumn;
		
		public static void SetPosition(IViewContent viewContent, int markerStartLine, int markerStartColumn, int markerEndLine, int markerEndColumn)
		{
			ITextEditorProvider tecp = viewContent as ITextEditorProvider;
			if (tecp != null) {
				SetPosition(tecp.TextEditor.FileName, tecp.TextEditor.Document, markerStartLine, markerStartColumn, markerEndLine, markerEndColumn);
			}
		}
		
		public static void SetPosition(FileName fileName, IDocument document, int markerStartLine, int markerStartColumn, int markerEndLine, int markerEndColumn)
		{
			if (document == null)
				return;
			Remove();
			
			startLine   = markerStartLine;
			startColumn = markerStartColumn;
			endLine     = markerEndLine;
			endColumn   = markerEndColumn;
			
			if (startLine < 1 || startLine > document.TotalNumberOfLines)
				return;
			if (endLine < 1 || endLine > document.TotalNumberOfLines) {
				endLine = startLine;
				endColumn = int.MaxValue;
			}
			if (startColumn < 1)
				startColumn = 1;
			
			IDocumentLine line = document.GetLine(startLine);
			if (endColumn < 1 || endColumn > line.Length)
				endColumn = line.Length;
			instance = new CurrentLineBookmark(fileName, new Location(startColumn, startLine));
			BookmarkManager.AddMark(instance);
		}
		
		public static void Remove()
		{
			if (instance != null) {
				BookmarkManager.RemoveMark(instance);
				instance = null;
			}
		}
		
		public override bool CanToggle {
			get {
				return false;
			}
		}
		
		public override int ZOrder {
			get { return 100; }
		}
		
		public CurrentLineBookmark(FileName fileName, Location location) : base(fileName, location)
		{
			this.IsSaved = false;
			this.IsVisibleInBookmarkPad = false;
		}
		
		readonly static IImage currentLineArrow = new ResourceServiceImage("Bookmarks.CurrentLine");
		
		public override IImage Image {
			get { return currentLineArrow; }
		}
		
		protected override ITextMarker CreateMarker(ITextMarkerService markerService)
		{
			IDocumentLine line = this.Document.GetLine(startLine);
			ITextMarker marker = markerService.Create(line.Offset + startColumn - 1, Math.Max(endColumn - startColumn, 1));
			marker.BackgroundColor = Colors.Yellow;
			marker.ForegroundColor = Colors.Blue;
			return marker;
		}
		
		public override bool CanDragDrop {
			get { return true; }
		}
		
		public override void Drop(int lineNumber)
		{
			// call async because the Debugger seems to use Application.DoEvents(), but we don't want to process events
			// because Drag'N'Drop operation has finished
			WorkbenchSingleton.SafeThreadAsyncCall(
				delegate {
					DebuggerService.CurrentDebugger.SetInstructionPointer(this.FileName, lineNumber, 1);
				});
		}
	}
}