// 
// ConvertExplicitToImplicitImplementation.cs
// 
// Author:
//      Mansheng Yang <lightyang0@gmail.com>
// 
// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.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.Linq;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;

namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
	[ContextAction ("Convert explicit to implict implementation",
					Description = " Convert explicit implementation of an interface method to implicit implementation")]
	public class ConvertExplicitToImplicitImplementationAction : SpecializedCodeAction<MethodDeclaration>
	{
		protected override CodeAction GetAction (RefactoringContext context, MethodDeclaration node)
		{
			if (node.PrivateImplementationType.IsNull)
				return null;

			if (!node.NameToken.Contains (context.Location) && 
				!node.PrivateImplementationType.Contains(context.Location))
				return null;

			var method = (IMethod)((MemberResolveResult)context.Resolve (node)).Member;
			var type = method.DeclaringType ?? SpecialType.UnknownType;

			// find existing method with the same signature
			if (type.GetMethods (m => m.Name == node.Name && m.TypeParameters.Count == method.TypeParameters.Count
				&& !m.IsExplicitInterfaceImplementation)
				.Any (m => ParameterListComparer.Instance.Equals (m.Parameters, method.Parameters)))
				return null;

			return new CodeAction (context.TranslateString ("Convert explict to implicit implementation"),
				script =>
				{
					var implicitImpl = (MethodDeclaration)node.Clone ();
					implicitImpl.PrivateImplementationType = AstType.Null;

					// remove visibility modifier, in case the code contains error
					implicitImpl.Modifiers &= ~Modifiers.VisibilityMask;

					implicitImpl.Modifiers |= Modifiers.Public;
					script.Replace (node, implicitImpl);
				}, 
			node.NameToken);
		}
	}
}
