// GtkSharp.Generation.ReturnValue.cs - The ReturnValue Generatable.
//
// Author: Mike Kestner <mkestner@novell.com>
//
// Copyright (c) 2004-2005 Novell, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the GNU General Public
// License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.


namespace GtkSharp.Generation {

	using System;
	using System.Xml;

	public class ReturnValue  {

		
		private XmlElement elem;

		public ReturnValue (XmlElement elem) 
		{
			this.elem = elem;
		}

		public string CType {
			get {
				return elem == null ? String.Empty : elem.GetAttribute("type");
			}
		}

		public string CSType {
			get {
				if (IGen == null)
					return String.Empty;

				if (ElementType != String.Empty)
					return ElementType + "[]";

				return IGen.QualifiedName + (IsArray ? "[]" : String.Empty);
			}
		}

		string ElementCType {
			get {
				if (elem != null && elem.HasAttribute ("element_type"))
					return elem.GetAttribute ("element_type");

				return String.Empty;
			}
		}

		bool ElementsOwned {
			get {
				if (elem != null && elem.GetAttribute ("elements_owned") == "true")
					return true;

				return false;
			}
		}

		string ElementType {
			get {
				if (ElementCType.Length > 0)
					return SymbolTable.Table.GetCSType (ElementCType);

				return String.Empty;
			}
		}

		IGeneratable igen;
		IGeneratable IGen {
			get {
				if (igen == null)
					igen = SymbolTable.Table [CType];
				return igen;
			}
		}

		bool IsArray {
			get {
				return elem == null ? false : elem.HasAttribute ("array");
			}
		}

		public bool IsVoid {
			get {
				return CSType == "void";
			}
		}

		public string MarshalType {
			get {
				if (IGen == null)
					return String.Empty;
				return IGen.MarshalReturnType + (IsArray ? "[]" : String.Empty);
			}
		}

		bool Owned {
			get {
				return elem.GetAttribute ("owned") == "true";
			}
		}

		public string ToNativeType {
			get {
				if (IGen == null)
					return String.Empty;
				return IGen.ToNativeReturnType + (IsArray ? "[]" : String.Empty);
			}
		}

		public string FromNative (string var)
		{
			if (IGen == null)
				return String.Empty;

			if (ElementType != String.Empty) {
				string type_str = "typeof (" + ElementType + ")";
				string args = type_str + ", " + (Owned ? "true" : "false") + ", " + (ElementsOwned ? "true" : "false");
				return String.Format ("({0}[]) GLib.Marshaller.ListToArray ({1}, {2})", ElementType, IGen.FromNativeReturn (var + ", " + args), type_str);
			} else if (IGen is HandleBase)
				return ((HandleBase)IGen).FromNative (var, Owned);
			else
				return IGen.FromNativeReturn (var);
		}
			
		public string ToNative (string var)
		{
			if (IGen == null)
				return String.Empty;

			if (ElementType.Length > 0) {
				string args = ", typeof (" + ElementType + "), " + (Owned ? "true" : "false") + ", " + (ElementsOwned ? "true" : "false");
				var = "new " + IGen.QualifiedName + "(" + var + args + ")";
			}

			if (IGen is IManualMarshaler)
				return (IGen as IManualMarshaler).AllocNative (var);
			else
				return IGen.ToNativeReturn (var);
		}

		public bool Validate ()
		{
			if (MarshalType == "" || CSType == "") {
				Console.Write("rettype: " + CType);
				return false;
			}

			return true;
		}
	}
}