// GtkSharp.Generation.MiniObjectGen.cs - The Mini Object Generatable.
//
// Author: Mike Kestner <mkestner@ximian.com>
//
// Copyright (c) 2001-2003 Mike Kestner
// Copyright (c) 2003-2004 Novell, Inc.
// Copyright (c) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
//
// 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.Collections;
	using System.IO;
	using System.Text;
	using System.Xml;

	public class MiniObjectGen : ObjectBase  {

		private ArrayList custom_attrs = new ArrayList();
		private ArrayList strings = new ArrayList();
		private static Hashtable dirs = new Hashtable ();

		public MiniObjectGen (XmlElement ns, XmlElement elem) : base (ns, elem, false) 
		{
			foreach (XmlNode node in elem.ChildNodes) {
				if (!(node is XmlElement)) continue;
				XmlElement member = (XmlElement) node;
				if (member.HasAttribute ("hidden") && member.GetAttribute ("hidden") == "1") continue;

				switch (node.Name) {
				case "custom-attribute":
					custom_attrs.Add (member.InnerXml);
					break;

				case "static-string":
					strings.Add (node);
					break;

				default:
					if (!IsNodeNameHandled (node.Name))
						Console.WriteLine ("Unexpected node " + node.Name + " in " + CName);
					break;
				}
			}
		}

		public override string CallByName (string var, bool owned)
		{
			return String.Format ("{0} == null ? IntPtr.Zero : {0}.{1}", var, owned ? "OwnedHandle" : "Handle");
		}

		public override bool Validate ()
		{
			ArrayList invalids = new ArrayList ();

			return base.Validate ();
		}

		private bool DisableVoidCtor {
			get {
				return Elem.HasAttribute ("disable_void_ctor");
			}
		}

		private bool DisableGTypeCtor {
			get {
				return Elem.HasAttribute ("disable_gtype_ctor");
			}
		}

		private class DirectoryInfo {
			public string assembly_name;
			public Hashtable objects;

			public DirectoryInfo (string assembly_name) {
				this.assembly_name = assembly_name;
				objects = new Hashtable ();
			}
		}

		private static DirectoryInfo GetDirectoryInfo (string dir, string assembly_name)
		{
			DirectoryInfo result;

			if (dirs.ContainsKey (dir)) {
				result = dirs [dir] as DirectoryInfo;
				if  (result.assembly_name != assembly_name) {
					Console.WriteLine ("Can't put multiple assemblies in one directory.");
					return null;
				}

				return result;
			}

			result = new DirectoryInfo (assembly_name);
			dirs.Add (dir, result);
			
			return result;
		}

		public override void Generate (GenerationInfo gen_info)
		{
			gen_info.CurrentType = Name;

			string asm_name = gen_info.AssemblyName.Length == 0 ? NS.ToLower () + "-sharp" : gen_info.AssemblyName;
			DirectoryInfo di = GetDirectoryInfo (gen_info.Dir, asm_name);

			StreamWriter sw = gen_info.Writer = gen_info.OpenStream (Name);

			sw.WriteLine ("namespace " + NS + " {");
			sw.WriteLine ();
			sw.WriteLine ("\tusing System;");
			sw.WriteLine ("\tusing System.Collections;");
			sw.WriteLine ("\tusing System.Runtime.InteropServices;");
			sw.WriteLine ();

			SymbolTable table = SymbolTable.Table;

			sw.WriteLine ("#region Autogenerated code");
			if (IsDeprecated)
				sw.WriteLine ("\t[Obsolete]");
			foreach (string attr in custom_attrs)
				sw.WriteLine ("\t" + attr);
			sw.Write ("\t{0} {1}class " + Name, IsInternal ? "internal" : "public", IsAbstract ? "abstract " : "");
			string cs_parent = table.GetCSType(Elem.GetAttribute("parent"));
			if (cs_parent != "") {
				di.objects.Add (CName, QualifiedName);
				sw.Write (" : " + cs_parent);
			}
			foreach (string iface in managed_interfaces) {
				if (Parent != null && Parent.Implements (iface))
					continue;
				sw.Write (", " + iface);
			}
			sw.WriteLine (" {");
			sw.WriteLine ();

			GenCtors (gen_info);
			GenFields (gen_info);
			
			GenClassMembers (gen_info, cs_parent);
			GenMethods (gen_info, null, null);
			
			foreach (XmlElement str in strings) {
				sw.Write ("\t\tpublic static string " + str.GetAttribute ("name"));
				sw.WriteLine (" {\n\t\t\t get { return \"" + str.GetAttribute ("value") + "\"; }\n\t\t}");
			}

			if (cs_parent != String.Empty && GetExpected (CName) != QualifiedName) {
				sw.WriteLine ();
				sw.WriteLine ("\t\tstatic " + Name + " ()");
				sw.WriteLine ("\t\t{");
				sw.WriteLine ("\t\t\tGtkSharp." + Studlify (asm_name) + ".ObjectManager.Initialize ();");
				sw.WriteLine ("\t\t}");
			}

			sw.WriteLine ("#endregion");
			AppendCustom (sw, gen_info.CustomDir);

			sw.WriteLine ("\t}");
			sw.WriteLine ("}");

			sw.Close ();
			gen_info.Writer = null;
			Statistics.ObjectCount++;
		}

		protected override void GenCtors (GenerationInfo gen_info)
		{
			if (!Elem.HasAttribute("parent"))
				return;

			if (!DisableGTypeCtor) {
				gen_info.Writer.WriteLine("\t\t[Obsolete]");
				gen_info.Writer.WriteLine("\t\tprotected " + Name + "(Gst.GLib.GType gtype) : base(gtype) {}");
			}
			gen_info.Writer.WriteLine("\t\tpublic " + Name + "(IntPtr raw) : base(raw) {}");
			if (ctors.Count == 0 && !DisableVoidCtor) {
				gen_info.Writer.WriteLine();
				gen_info.Writer.WriteLine("\t\tprotected " + Name + "() : base(IntPtr.Zero)");
				gen_info.Writer.WriteLine("\t\t{");
				gen_info.Writer.WriteLine("\t\t\tCreateNativeObject ();");
				gen_info.Writer.WriteLine("\t\t}");
			}
			gen_info.Writer.WriteLine();

			base.GenCtors (gen_info);
		}

		void GenClassMembers (GenerationInfo gen_info, string cs_parent)
		{
			GenVirtualMethods (gen_info, null);

			if (class_struct_name == null || !CanGenerateClassStruct) return;
			StreamWriter sw = gen_info.Writer;
			GenerateClassStruct (gen_info);
			if (cs_parent == "")
				sw.WriteLine ("\t\tstatic uint class_offset = 0;");
			else
				sw.WriteLine ("\t\tstatic uint class_offset = ((Gst.GLib.GType) typeof ({0})).GetClassSize ();", cs_parent);
			sw.WriteLine ("\t\tstatic Hashtable class_structs;");
			sw.WriteLine ();
			sw.WriteLine ("\t\tstatic {0} GetClassStruct (Gst.GLib.GType gtype, bool use_cache)", class_struct_name);
			sw.WriteLine ("\t\t{");
			sw.WriteLine ("\t\t\tif (class_structs == null)");
			sw.WriteLine ("\t\t\t\tclass_structs = new Hashtable ();");
			sw.WriteLine ();
			sw.WriteLine ("\t\t\tif (use_cache && class_structs.Contains (gtype))");
			sw.WriteLine ("\t\t\t\treturn ({0}) class_structs [gtype];", class_struct_name);
			sw.WriteLine ("\t\t\telse {");
			sw.WriteLine ("\t\t\t\tIntPtr class_ptr = new IntPtr (gtype.GetClassPtr ().ToInt64 () + class_offset);");
			sw.WriteLine ("\t\t\t\t{0} class_struct = ({0}) Marshal.PtrToStructure (class_ptr, typeof ({0}));", class_struct_name);
			sw.WriteLine ("\t\t\t\tif (use_cache)");
			sw.WriteLine ("\t\t\t\t\tclass_structs.Add (gtype, class_struct);");
			sw.WriteLine ("\t\t\t\treturn class_struct;");
			sw.WriteLine ("\t\t\t}");
			sw.WriteLine ("\t\t}");
			sw.WriteLine ();
			sw.WriteLine ("\t\tstatic void OverrideClassStruct (Gst.GLib.GType gtype, {0} class_struct)", class_struct_name);
			sw.WriteLine ("\t\t{");
			sw.WriteLine ("\t\t\tIntPtr class_ptr = new IntPtr (gtype.GetClassPtr ().ToInt64 () + class_offset);");
			sw.WriteLine ("\t\t\tMarshal.StructureToPtr (class_struct, class_ptr, false);");
			sw.WriteLine ("\t\t}");
			sw.WriteLine ();
		}

		/* Keep this in sync with the one in glib/GType.cs */
		private static string GetExpected (string cname)
		{
			for (int i = 1; i < cname.Length; i++) {
				if (Char.IsUpper (cname[i])) {
					if (i == 1 && cname[0] == 'G')
						return "Gst.GLib." + cname.Substring (1);
					else
						return cname.Substring (0, i) + "." + cname.Substring (i);
				}
			}

			throw new ArgumentException ("cname doesn't follow the NamespaceType capitalization style: " + cname);
		}

		private static bool NeedsMap (Hashtable objs, string assembly_name)
		{
			foreach (string key in objs.Keys)
				if (GetExpected (key) != ((string) objs[key]))
					return true;
			
			return false;
		}

		private static string Studlify (string name)
		{
			string result = "";

			string[] subs = name.Split ('-');
			foreach (string sub in subs)
				result += Char.ToUpper (sub[0]) + sub.Substring (1);
				
			return result;
		}
				
		public static void GenerateMappers ()
		{
			foreach (string dir in dirs.Keys) {

				DirectoryInfo di = dirs[dir] as DirectoryInfo;

				if (!NeedsMap (di.objects, di.assembly_name))
					continue;
	
				GenerationInfo gen_info = new GenerationInfo (dir, di.assembly_name);

				GenerateMapper (di, gen_info);
			}
		}

		private static void GenerateMapper (DirectoryInfo dir_info, GenerationInfo gen_info)
		{
			StreamWriter sw = gen_info.OpenStream ("ObjectManager");

			sw.WriteLine ("namespace GtkSharp." + Studlify (dir_info.assembly_name) + " {");
			sw.WriteLine ();
			sw.WriteLine ("\tpublic class ObjectManager {");
			sw.WriteLine ();
			sw.WriteLine ("\t\tstatic bool initialized = false;");
			sw.WriteLine ("\t\t// Call this method from the appropriate module init function.");
			sw.WriteLine ("\t\tpublic static void Initialize ()");
			sw.WriteLine ("\t\t{");
			sw.WriteLine ("\t\t\tif (initialized)");
			sw.WriteLine ("\t\t\t\treturn;");
			sw.WriteLine ("");
			sw.WriteLine ("\t\t\tinitialized = true;");
	
			foreach (string key in dir_info.objects.Keys) {
				if (GetExpected(key) != ((string) dir_info.objects[key]))
					sw.WriteLine ("\t\t\tGst.GLib.GType.Register ({0}.GType, typeof ({0}));", dir_info.objects [key]);
			}
					
			sw.WriteLine ("\t\t}");
			sw.WriteLine ("\t}");
			sw.WriteLine ("}");
			sw.Close ();
		}

		public override string FromNative (string var, bool owned)
		{
			return "Gst.MiniObject.GetObject(" + var + (owned ? ", true" : "") + ") as " + QualifiedName;
		}
	}
}