// 
// TestRefactoringContext.cs
//  
// Author:
//       Mike Krüger <mkrueger@xamarin.com>
// 
// Copyright (c) 2011 Xamarin Inc.
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using ICSharpCode.NRefactory.CSharp.Refactoring;
using ICSharpCode.NRefactory.CSharp.Resolver;
using ICSharpCode.NRefactory.CSharp.TypeSystem;
using ICSharpCode.NRefactory.Editor;
using ICSharpCode.NRefactory.CSharp.FormattingTests;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
using NUnit.Framework;
using System.Threading;

namespace ICSharpCode.NRefactory.CSharp.ContextActions
{
	class TestRefactoringContext : RefactoringContext
	{
		internal readonly IDocument doc;
		readonly TextLocation location;
		
		public TestRefactoringContext(IDocument document, TextLocation location, CSharpAstResolver resolver) : base(resolver, CancellationToken.None)
		{
			this.doc = document;
			this.location = location;
		}
		
		public override bool Supports(Version version)
		{
			return true;
		}
		
		public override TextLocation Location {
			get { return location; }
		}
		
		public override Script StartScript ()
		{
			return new TestScript (this);
		}
		
		sealed class TestScript : DocumentScript
		{
			public TestScript(TestRefactoringContext context) : base(context.doc, new CSharpFormattingOptions())
			{
				this.eolMarker = context.EolMarker;
			}
		}
		
		#region Text stuff
		public override string EolMarker { get { return Environment.NewLine; } }

		public override bool IsSomethingSelected { get { return SelectionStart > 0; }  }

		public override string SelectedText { get { return IsSomethingSelected ? doc.GetText (SelectionStart, SelectionLength) : ""; } }
		
		int selectionStart;
		public override int SelectionStart { get { return selectionStart; } }
		
		int selectionEnd;
		public override int SelectionEnd { get { return selectionEnd; } }

		public override int SelectionLength { get { return IsSomethingSelected ? SelectionEnd - SelectionStart : 0; } }

		public override int GetOffset (TextLocation location)
		{
			return doc.GetOffset (location);
		}
		
		public override TextLocation GetLocation (int offset)
		{
			return doc.GetLocation (offset);
		}

		public override string GetText (int offset, int length)
		{
			return doc.GetText (offset, length);
		}
		
		public override string GetText (ISegment segment)
		{
			return doc.GetText (segment);
		}
		
		public override IDocumentLine GetLineByOffset (int offset)
		{
			return doc.GetLineByOffset (offset);
		}
		#endregion
		
		public static TestRefactoringContext Create(string content)
		{
			int idx = content.IndexOf ("$");
			if (idx >= 0)
				content = content.Substring (0, idx) + content.Substring (idx + 1);
			int idx1 = content.IndexOf ("<-");
			int idx2 = content.IndexOf ("->");
			
			int selectionStart = 0;
			int selectionEnd = 0;
			if (0 <= idx1 && idx1 < idx2) {
				content = content.Substring (0, idx2) + content.Substring (idx2 + 2);
				content = content.Substring (0, idx1) + content.Substring (idx1 + 2);
				selectionStart = idx1;
				selectionEnd = idx2 - 2;
				idx = selectionEnd;
			}
			
			var doc = new StringBuilderDocument (content);
			var parser = new CSharpParser ();
			var unit = parser.Parse (content, "program.cs");
			if (parser.HasErrors)
				parser.ErrorPrinter.Errors.ForEach (e => Console.WriteLine (e.Message));
			Assert.IsFalse (parser.HasErrors, "File contains parsing errors.");
			unit.Freeze();
			var parsedFile = unit.ToTypeSystem();
			
			IProjectContent pc = new CSharpProjectContent();
			pc = pc.UpdateProjectContent(null, parsedFile);
			pc = pc.AddAssemblyReferences(new[] { CecilLoaderTests.Mscorlib, CecilLoaderTests.SystemCore });
			
			var compilation = pc.CreateCompilation();
			var resolver = new CSharpAstResolver(compilation, unit, parsedFile);
			TextLocation location = TextLocation.Empty;
			if (idx >= 0)
				location = doc.GetLocation (idx);
			return new TestRefactoringContext(doc, location, resolver) {
				selectionStart = selectionStart,
				selectionEnd = selectionEnd
			};
		}
		
		internal static void Print (AstNode node)
		{
			var v = new CSharpOutputVisitor (Console.Out, new CSharpFormattingOptions ());
			node.AcceptVisitor (v);
		}
	}
}