// GtkSharp.Generation.ObjectGen.cs - The Object Generatable.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// (c) 2001 Mike Kestner

namespace GtkSharp.Generation {

	using System;
	using System.Collections;
	using System.IO;
	using System.Xml;

	public class ObjectGen : StructBase, IGeneratable  {
		
		public ObjectGen (String ns, XmlElement elem) : base (ns, elem) {}
		
		public String MarshalType {
			get
			{
				return "IntPtr";
			}
		}
		
		public String CallByName (String var_name)
		{
			return var_name + ".Handle";
		}
		
		public String FromNative(String var)
		{
			return "(" + QualifiedName + ") GLib.Object.GetObject(" + var + ")";
		}
		
		public void Generate (SymbolTable table)
		{
			if (!Directory.Exists("..\\" + ns.ToLower() + "\\generated")) {
				Directory.CreateDirectory("..\\"+ns.ToLower()+"\\generated");
			}
			String filename = "..\\" + ns.ToLower() + "\\generated\\" + Name + ".cs";
			
			FileStream stream = new FileStream (filename, FileMode.Create, FileAccess.Write);
			StreamWriter sw = new StreamWriter (stream);
			
			sw.WriteLine ("// Generated File.  Do not modify.");
			sw.WriteLine ("// <c> 2001 Mike Kestner");
			sw.WriteLine ();
			
			sw.WriteLine ("namespace " + ns + " {");
			sw.WriteLine ();
				
			sw.WriteLine ("\tusing System;");
			sw.WriteLine ("\tusing System.Collections;");
			sw.WriteLine ("\tusing System.Runtime.InteropServices;");
			sw.WriteLine ();

			String parent = elem.GetAttribute("parent");
			String cs_parent = table.GetCSType(parent);
			sw.Write ("\tpublic class " + Name);
			if (cs_parent == "") {
				sw.WriteLine (" {");
				Console.WriteLine ("Object " + Name + " Unknown parent " + parent);
			} else {
				sw.WriteLine (" : " + cs_parent + " {");
			}
			sw.WriteLine ();
				
			sw.WriteLine("\t\tpublic " + Name + "(IntPtr raw) : base(raw) {}");
			sw.WriteLine();
				
			Hashtable clash_map = new Hashtable();
				
			foreach (XmlNode node in elem.ChildNodes) {
				
				XmlElement member = (XmlElement) node;

				switch (node.Name) {
				case "field":
					//if (!GenField(member, table, sw)) {
					//	Console.WriteLine("in object " + CName);
					//}
					break;
					
				case "callback":
					break;
					
				case "constructor":
					if (!GenCtor(member, table, sw, clash_map)) {
						Console.WriteLine("in object " + CName);
					}
					break;
					
				case "method":
					if (!GenMethod(member, table, sw)) {
						Console.WriteLine("in object " + CName);
					}
					break;
					
				case "property":
					if (!GenProperty(member, table, sw)) {
						Console.WriteLine("in object " + CName);
					}
					break;
					
				case "signal":
					break;
					
				default:
					Console.WriteLine ("Unexpected node");
					break;
				}
				
			}
			
			if (!clash_map.ContainsKey("")) {
				sw.WriteLine("\t\tpublic " + Name + "() : base(){}");
				sw.WriteLine();
			}
				
			sw.WriteLine ("\t}");
			sw.WriteLine ();
			sw.WriteLine ("}");
			
			sw.Flush();
			sw.Close();
		}
		
		public bool GenProperty (XmlElement prop, SymbolTable table, StreamWriter sw)
		{
			String c_type = prop.GetAttribute("type");

			char[] ast = {'*'};
			c_type = c_type.TrimEnd(ast);
			String cs_type = table.GetCSType(c_type);
			String m_type;
			
			if (table.IsObject(c_type)) {
				m_type = "GLib.Object";
			} else if (table.IsBoxed(c_type)) {
				m_type = "GtkSharp.Boxed";
			} else if (table.IsInterface(c_type)) {
				// FIXME: Handle interface props properly.
				Console.Write("Interface property detected ");
				return true;
			} else {
				m_type = table.GetMarshalType(c_type);
			}
			
			if ((cs_type == "") || (m_type == "")) {
				Console.Write("Property has unknown Type {0} ", c_type);
				return false;
			}
			
			if (prop.HasAttribute("construct-only") && !prop.HasAttribute("readable")) {
				return true;
			}
			
			XmlElement parent = (XmlElement) prop.ParentNode;
			String name = prop.GetAttribute("name");
			if (name == parent.GetAttribute("name")) {
				name += "Prop";
			}

			sw.WriteLine("\t\tpublic " + cs_type + " " + name + " {");
			if (prop.HasAttribute("readable")) {
				sw.WriteLine("\t\t\tget {");
				sw.WriteLine("\t\t\t\t" + m_type + " val;");
				sw.WriteLine("\t\t\t\tGetProperty(\"" + prop.GetAttribute("cname") + "\", out val);");
				sw.Write("\t\t\t\treturn ");
				if (cs_type != m_type) {
					sw.Write("(" + cs_type + ") ");
				}
				sw.WriteLine("val;");
				sw.WriteLine("\t\t\t}");
			}
			
			if (prop.HasAttribute("writeable") && !prop.HasAttribute("construct-only")) {
				sw.WriteLine("\t\t\tset {");
				sw.WriteLine("\t\t\t\tSetProperty(\"" + prop.GetAttribute("cname") + "\", (" + m_type + ") value);");
				sw.WriteLine("\t\t\t}");
			}
			
			sw.WriteLine("\t\t}");
			sw.WriteLine();
			
			return true;
		}

		public bool GenSignal (XmlElement sig, SymbolTable table, StreamWriter sw)
		{
			String cname = "\"" + sig.GetAttribute("cname") + "\"";

			String marsh = "blah"; // SignalHandler.GetName(sig);
			if (marsh == "") {
				return false;
			}

			sw.WriteLine("\t\t/// <summary> " + cname + " Event </summary>");
			sw.WriteLine("\t\t/// <remarks>");
			// FIXME: Generate some signal docs
			sw.WriteLine("\t\t/// </remarks>");
			sw.WriteLine();
			sw.WriteLine("\t\tpublic event EventHandler " + cname + " {");
			sw.WriteLine("\t\t\tadd {");
			sw.WriteLine("\t\t\t\tif (Events [" + cname + "] == null)");
			sw.Write("\t\t\t\t\tSignals[" + cname + "] = new " + marsh);
			sw.WriteLine("(this, Handle, " + cname + ", value);");
			sw.WriteLine("\t\t\t\tEvents.AddHandler(" + cname + ", value);");
			sw.WriteLine("\t\t\t}");
			sw.WriteLine("\t\t\tremove {");
			sw.WriteLine("\t\t\t\tEvents.RemoveHandler(" + cname + ", value);");
			sw.WriteLine("\t\t\t\tif (Events[" + cname + "] == null)");
			sw.WriteLine("\t\t\t\t\tSignals.Remove(" + cname + ");");
			sw.WriteLine("\t\t\t}");
			sw.WriteLine("\t\t}");
			sw.WriteLine();
			
			return true;
		}
	}
}