#region license
// Copyright (c) 2003, 2004, 2005 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 Boo.Lang.Compiler.Ast;

	public class NormalizeTypeAndMemberDefinitions : AbstractVisitorCompilerStep
	{
		override public void Run()
		{
			Visit(CompileUnit.Modules);
		}

		override public void OnModule(Module node)
		{
			Visit(node.Members);
		}
		
		void LeaveTypeDefinition(TypeDefinition node)
		{
			if (!node.IsVisibilitySet)
			{
				node.Modifiers |= TypeMemberModifiers.Public;
			}
		}
		
		override public void LeaveEnumDefinition(EnumDefinition node)
		{
			LeaveTypeDefinition(node);
		}
		
		override public void LeaveInterfaceDefinition(InterfaceDefinition node)
		{
			LeaveTypeDefinition(node);
		}
		
		override public void LeaveClassDefinition(ClassDefinition node)
		{
			LeaveTypeDefinition(node);
			if (!node.HasInstanceConstructor)
			{
				node.Members.Add(AstUtil.CreateConstructor(node, TypeMemberModifiers.Public));
			}
		}
		
		override public void LeaveField(Field node)
		{
			if (!node.IsVisibilitySet)
			{
				node.Modifiers |= TypeMemberModifiers.Protected;
			}
		}
		
		override public void LeaveProperty(Property node)
		{
			if (!node.IsVisibilitySet && null == node.ExplicitInfo)
			{
				node.Modifiers |= TypeMemberModifiers.Public;
			}
			if (IsInterface(node.DeclaringType))
			{
				node.Modifiers |= TypeMemberModifiers.Abstract;
			}

			if (null != node.Getter)
			{
				SetPropertyAccessorModifiers(node, node.Getter);
				node.Getter.Name = "get_" + node.Name;
			}
			if (null != node.Setter)
			{
				SetPropertyAccessorModifiers(node, node.Setter);
				node.Setter.Name = "set_" + node.Name;
			}
			
			LeaveMember(node);
		}

		void SetPropertyAccessorModifiers(Property property, Method accessor)
		{
			if (!accessor.IsVisibilitySet)
			{
				accessor.Modifiers |= property.Visibility;
			}
			
			if (property.IsStatic)
			{
				accessor.Modifiers |= TypeMemberModifiers.Static;
			}
			
			if (property.IsVirtual)
			{
				accessor.Modifiers |= TypeMemberModifiers.Virtual;
			}
			
			/*
			if (property.IsOverride)
			{
				accessor.Modifiers |= TypeMemberModifiers.Override;
			}
			*/
			
			if (property.IsAbstract)
			{
				accessor.Modifiers |= TypeMemberModifiers.Abstract;
			}
			else if (accessor.IsAbstract)
			{
				// an abstract accessor makes the entire property abstract
				property.Modifiers |= TypeMemberModifiers.Abstract;
			}
		}
		
		override public void LeaveEvent(Event node)
		{
			if (!node.IsVisibilitySet)
			{
				node.Modifiers |= TypeMemberModifiers.Public;
			}
			if (IsInterface(node.DeclaringType))
			{
				node.Modifiers |= TypeMemberModifiers.Abstract;
			}
			LeaveMember(node);
		}
		
		override public void LeaveMethod(Method node)
		{
			if (!node.IsVisibilitySet && null == node.ExplicitInfo
				&& !(node.ParentNode.NodeType == NodeType.Property))
			{
				node.Modifiers |= TypeMemberModifiers.Public;
			}
			if (IsInterface(node.DeclaringType))
			{
				node.Modifiers |= TypeMemberModifiers.Abstract;
			}
			if (node.Name != null && node.Name.StartsWith("op_"))
			{
				node.Modifiers |= TypeMemberModifiers.Static;
			}
			LeaveMember(node);
		}

		override public void OnDestructor(Destructor node)
		{
			Method finalizer = CodeBuilder.CreateMethod(
				"Finalize",
				TypeSystemServices.VoidType,
				TypeMemberModifiers.Protected | TypeMemberModifiers.Override);
			finalizer.LexicalInfo = node.LexicalInfo;

			MethodInvocationExpression mie = new MethodInvocationExpression(new SuperLiteralExpression());

			Block bodyNew = new Block();
			Block ensureBlock = new Block();
			ensureBlock.Add (mie);

			TryStatement tryStatement = new TryStatement();
			tryStatement.EnsureBlock = ensureBlock;
			tryStatement.ProtectedBlock = node.Body;

			bodyNew.Add(tryStatement);
			finalizer.Body = bodyNew;

			node.ParentNode.Replace(node, finalizer);
		}

		void LeaveMember(TypeMember node)
		{
			if (node.IsAbstract)
			{
				if (!IsInterface(node.DeclaringType))
				{
					node.DeclaringType.Modifiers |= TypeMemberModifiers.Abstract;
				}
			}
		}

		bool IsInterface(TypeDefinition node)
		{
			return NodeType.InterfaceDefinition == node.NodeType;
		}
		
		override public void LeaveConstructor(Constructor node)
		{
			if (!node.IsVisibilitySet)
			{
				node.Modifiers |= TypeMemberModifiers.Public;
			}
		}

	}
}
