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// 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.Collections.Generic;
using System.Runtime.CompilerServices;
using Tango.Scripting.Editors.Document;
using Tango.Scripting.Editors.Utils;

namespace Tango.Scripting.Editors.Editing
{
	sealed class EmptySelection : Selection
	{
		public EmptySelection(TextArea textArea) : base(textArea)
		{
		}
		
		public override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
		{
			return this;
		}
		
		public override TextViewPosition StartPosition {
			get { return new TextViewPosition(TextLocation.Empty); }
		}
		
		public override TextViewPosition EndPosition {
			get { return new TextViewPosition(TextLocation.Empty); }
		}
		
		public override ISegment SurroundingSegment {
			get { return null; }
		}
		
		public override Selection SetEndpoint(TextViewPosition endPosition)
		{
			throw new NotSupportedException();
		}
		
		public override Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition)
		{
			var document = textArea.Document;
			if (document == null)
				throw ThrowUtil.NoDocumentAssigned();
			return Create(textArea, startPosition, endPosition);
		}
		
		public override IEnumerable<SelectionSegment> Segments {
			get { return Empty<SelectionSegment>.Array; }
		}
		
		public override string GetText()
		{
			return string.Empty;
		}
		
		public override void ReplaceSelectionWithText(string newText)
		{
			if (newText == null)
				throw new ArgumentNullException("newText");
			newText = AddSpacesIfRequired(newText, textArea.Caret.Position, textArea.Caret.Position);
			if (newText.Length > 0) {
				if (textArea.ReadOnlySectionProvider.CanInsert(textArea.Caret.Offset)) {
					textArea.Document.Insert(textArea.Caret.Offset, newText);
				}
			}
			textArea.Caret.VisualColumn = -1;
		}
		
		public override int Length {
			get { return 0; }
		}
		
		// Use reference equality because there's only one EmptySelection per text area.
		public override int GetHashCode()
		{
			return RuntimeHelpers.GetHashCode(this);
		}
		
		public override bool Equals(object obj)
		{
			return this == obj;
		}
	}
}