#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.TypeSystem
{
	using System;

	public class ModuleEntity : INamespace, IEntity
	{
		NameResolutionService _nameResolutionService;
		
		TypeSystemServices _typeSystemServices;
		
		Boo.Lang.Compiler.Ast.Module _module;
		
		INamespace _moduleClassNamespace = NullNamespace.Default;
		
		INamespace[] _using;
		
		string _namespace;
		
		public ModuleEntity(NameResolutionService nameResolutionService, TypeSystemServices tagManager, Boo.Lang.Compiler.Ast.Module module)
		{
			_nameResolutionService = nameResolutionService;
			_typeSystemServices = tagManager;
			_module = module;			
			if (null == module.Namespace)
			{
				_namespace = "";
			}
			else
			{
				_namespace = module.Namespace.Name;
			}
		}
		
		public EntityType EntityType
		{
			get
			{
				return EntityType.Module;
			}
		}
		
		public string Name
		{
			get
			{
				return _module.Name;
			}
		}
		
		public string FullName
		{
			get
			{
				return _module.FullName;
			}
		}
		
		public string Namespace
		{
			get
			{                             
				return _namespace;
			}
		}
		
		public void InitializeModuleClass(Boo.Lang.Compiler.Ast.ClassDefinition moduleClass)
		{
			if (null == moduleClass.Entity)
			{
				moduleClass.Entity = new InternalClass(_typeSystemServices, moduleClass);
			}
			_moduleClassNamespace = (INamespace)moduleClass.Entity;
		}
		
		public bool ResolveMember(Boo.Lang.List targetList, string name, EntityType flags)
		{
			if (ResolveModuleMember(targetList, name, flags))
			{
				return true;
			}
			return _moduleClassNamespace.Resolve(targetList, name, flags);
		}
		
		public INamespace ParentNamespace
		{
			get
			{
				return _nameResolutionService.GlobalNamespace;
			}
		}
		
		public bool Resolve(Boo.Lang.List targetList, string name, EntityType flags)
		{
			if (ResolveMember(targetList, name, flags))
			{
				return true;
			}
			
			if (null == _using)
			{
				_using = new INamespace[_module.Imports.Count];
				for (int i=0; i<_using.Length; ++i)
				{
					_using[i] = (INamespace)TypeSystemServices.GetEntity(_module.Imports[i]);
				}
			}
				
			bool found = false;
			foreach (INamespace ns in _using)
			{			
				if (ns.Resolve(targetList, name, flags))
				{
					found = true;
				}
			}
			return found;
		}
		
		bool ResolveModuleMember(Boo.Lang.List targetList, string name, EntityType flags)
		{
			bool found=false;
			foreach (Boo.Lang.Compiler.Ast.TypeMember member in _module.Members)
			{
				if (name == member.Name)
				{
					IEntity tag = TypeSystemServices.GetEntity(member);
					if (NameResolutionService.IsFlagSet(flags, tag.EntityType))
					{
						targetList.Add(tag);
						found = true;
					}
				}
			}
			return found;
		}
		
		public IEntity[] GetMembers()
		{
			return _moduleClassNamespace.GetMembers();
		}
	}
}
