//
// ConvertAnonymousDelegateToExpression.cs
//
// Author:
//       Simon Lindgren <simon.n.lindgren@gmail.com>
//
// Copyright (c) 2012 Simon Lindgren
//
// 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.

namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
	[ContextAction("Convert anonymous delegate to lambda block",
	               Description = "Converts an anonymous delegate into a lambda in block form.")]
	public class ConvertAnonymousDelegateToLambdaAction : SpecializedCodeAction<AnonymousMethodExpression>
	{
		#region implemented abstract members of SpecializedCodeAction
		protected override CodeAction GetAction(RefactoringContext context, AnonymousMethodExpression node)
		{
			if (context.Location < node.DelegateToken.StartLocation || context.Location >= node.Body.StartLocation)
				return null;

			if (!node.HasParameterList)
				return null;

			return new CodeAction(context.TranslateString("Convert to lambda block"), script => {
				var parent = node.Parent;
				while (!(parent is Statement))
					parent = parent.Parent;
				bool explicitLambda = parent is VariableDeclarationStatement && ((VariableDeclarationStatement)parent).Type.GetText() == "var";
				var lambda = new LambdaExpression {	Body = node.Body.Clone() };
				foreach (var parameter in node.Parameters) {
					if (explicitLambda) {
						lambda.Parameters.Add(new ParameterDeclaration { Type = parameter.Type.Clone(), Name = parameter.Name });
					} else {
						lambda.Parameters.Add(new ParameterDeclaration { Name = parameter.Name });
					}
				}
				script.Replace(node, lambda);
			});
		}
		#endregion
	}
}