// 
// CreateCustomEventImplementationAction.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.

namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
	[ContextAction ("Create custom event implementation", Description = "Create custom event implementation.")]
	public class CreateCustomEventImplementationAction : SpecializedCodeAction<VariableInitializer>
	{
		protected override CodeAction GetAction (RefactoringContext context, VariableInitializer node)
		{
			var eventDecl = node.Parent as EventDeclaration;
			if (eventDecl == null)
				return null;
			return new CodeAction (context.TranslateString ("Create custom event implementation"),
				script =>
				{
					var accessor = new Accessor
					{
						Body = new BlockStatement
						{
							new ThrowStatement(
								new ObjectCreateExpression(context.CreateShortType("System", "NotImplementedException")))	
						}
					};
					var e = new CustomEventDeclaration
					{
						Name = node.Name,
						Modifiers = eventDecl.Modifiers,
						ReturnType = eventDecl.ReturnType.Clone (),
						AddAccessor = accessor,
						RemoveAccessor = (Accessor)accessor.Clone(),
					};
					if (eventDecl.Variables.Count > 1) {
						var newEventDecl = (EventDeclaration)eventDecl.Clone ();
						newEventDecl.Variables.Remove (
							newEventDecl.Variables.FirstOrNullObject (v => v.Name == node.Name));
						script.InsertBefore (eventDecl, newEventDecl);
					}
					script.Replace (eventDecl, e);
				});
		}
	}
}