#region license
// Copyright (c) 2004, Rodrigo B. de Oliveira (rbo@acm.org)
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// 
//     * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//     * Neither the name of Rodrigo B. de Oliveira nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion

namespace Boo.Lang.Compiler.Steps
{
	using System;
	using System.Diagnostics;
	using Boo.Lang.Compiler;
	using Boo.Lang.Compiler.Ast;
	using Boo.Lang.Compiler.TypeSystem;
	
	public class ImplementICallableOnCallableDefinitions : AbstractVisitorCompilerStep
	{
		override public void Run()
		{
			Visit(CompileUnit);
		}
		
		override public void OnModule(Module node)
		{
			Visit(node.Members, NodeType.ClassDefinition);
		}
		
		override public void OnClassDefinition(ClassDefinition node)
		{
			Visit(node.Members, NodeType.ClassDefinition);
			
			InternalCallableType type = node.Entity as InternalCallableType;
			if (null != type)
			{
				ImplementICallableCall(type, node);
			}
		}
		
		void ImplementICallableCall(InternalCallableType type, ClassDefinition node)
		{
			Method call = (Method)node.Members["Call"];
			Debug.Assert(null != call);
			Debug.Assert(0 == call.Body.Statements.Count);
			
			CallableSignature signature = type.GetSignature();
			MethodInvocationExpression mie = CodeBuilder.CreateMethodInvocation(CodeBuilder.CreateSelfReference(type),
													type.GetInvokeMethod());
							
			IParameter[] parameters = signature.Parameters;
			if (parameters.Length > 0)
			{
				ReferenceExpression args = CodeBuilder.CreateReference(call.Parameters[0]);
				for (int i=0; i<parameters.Length; ++i)
				{
					mie.Arguments.Add(CodeBuilder.CreateSlicing(args.CloneNode(), i));
				}
			}
			
			if (TypeSystemServices.VoidType == signature.ReturnType)
			{
				call.Body.Add(mie);
			}
			else
			{
				call.Body.Add(new ReturnStatement(mie));
			}
		}		
	}
}
