// 
// RefactoringContext.cs
//
// Author:
//       Mike Krüger <mkrueger@novell.com>
// 
// Copyright (c) 2011 Mike Krüger <mkrueger@novell.com>
// 
// 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.Linq;
using System.Threading;
using ICSharpCode.NRefactory.CSharp.Resolver;
using ICSharpCode.NRefactory.CSharp.TypeSystem;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem.Implementation;
using ICSharpCode.NRefactory.Editor;
using System.Collections.Generic;

namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
	public abstract class RefactoringContext : BaseRefactoringContext
	{
		public RefactoringContext(CSharpAstResolver resolver, CancellationToken cancellationToken) : base (resolver, cancellationToken)
		{

		}

		public abstract TextLocation Location { get; }
		
		public TypeSystemAstBuilder CreateTypeSystemAstBuilder()
		{
			var astNode = GetNode() ?? RootNode.GetNodeAt(Location) ?? RootNode;
			var csResolver = Resolver.GetResolverStateBefore(astNode);
			return new TypeSystemAstBuilder(csResolver);
		}
		
		public virtual AstType CreateShortType (IType fullType)
		{
			var builder = CreateTypeSystemAstBuilder();
			return builder.ConvertType(fullType);
		}
		
		public virtual AstType CreateShortType(string ns, string name, int typeParameterCount = 0)
		{
			var builder = CreateTypeSystemAstBuilder();
			return builder.ConvertType(new TopLevelTypeName(ns, name, typeParameterCount));
		}

		public virtual IEnumerable<AstNode> GetSelectedNodes()
		{
			if (!IsSomethingSelected) {
				return Enumerable.Empty<AstNode> ();
			}
			
			return RootNode.GetNodesBetween(SelectionStart, SelectionEnd);
		}

		public AstNode GetNode ()
		{
			return RootNode.GetNodeAt (Location);
		}
		
		public AstNode GetNode (Predicate<AstNode> pred)
		{
			return RootNode.GetNodeAt (Location, pred);
		}
		
		public T GetNode<T> () where T : AstNode
		{
			return RootNode.GetNodeAt<T> (Location);
		}
		
		public CSharpTypeResolveContext GetTypeResolveContext()
		{
			if (UnresolvedFile != null)
				return UnresolvedFile.GetTypeResolveContext(Compilation, Location);
			else
				return null;
		}

		#region Naming
		public virtual string GetNameProposal (string name, bool camelCase = true)
		{
			return GetNameProposal(name, Location, camelCase);
		}
		#endregion
	}
}