// gst-gapi-fixup.cs - xml alteration engine.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// Copyright (c) 2003 Mike Kestner
// Copyright (c) 2009 Sebastian Dröge
//
// 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.Parsing {

  using System;
  using System.IO;
  using System.Xml;
  using System.Xml.XPath;

  public class Fixup  {

    public static int Main (string[] args) {
      if (args.Length < 2) {
        Console.WriteLine ("Usage: gst-gapi-fixup --metadata=<filename> --api=<filename> --symbols=<filename>");
        return 0;
      }

      string api_filename = "";
      XmlDocument api_doc = new XmlDocument ();
      XmlDocument meta_doc = new XmlDocument ();
      XmlDocument symbol_doc = new XmlDocument ();

      foreach (string arg in args) {

        if (arg.StartsWith ("--metadata=")) {

          string meta_filename = arg.Substring (11);

          try {
            Stream stream = File.OpenRead (meta_filename);
            meta_doc.Load (stream);
            stream.Close ();
          } catch (XmlException e) {
            Console.WriteLine ("Invalid meta file.");
            Console.WriteLine (e);
            return 1;
          }

        } else if (arg.StartsWith ("--api=")) {

          api_filename = arg.Substring (6);

          try {
            Stream stream = File.OpenRead (api_filename);
            api_doc.Load (stream);
            stream.Close ();
          } catch (XmlException e) {
            Console.WriteLine ("Invalid api file.");
            Console.WriteLine (e);
            return 1;
          }

        } else if (arg.StartsWith ("--symbols=")) {

          string symbol_filename = arg.Substring (10);

          try {
            Stream stream = File.OpenRead (symbol_filename);
            symbol_doc.Load (stream);
            stream.Close ();
          } catch (XmlException e) {
            Console.WriteLine ("Invalid api file.");
            Console.WriteLine (e);
            return 1;
          }

        } else {
          Console.WriteLine ("Usage: gapi-fixup --metadata=<filename> --api=<filename>");
          return 1;
        }
      }

      XPathNavigator meta_nav = meta_doc.CreateNavigator ();
      XPathNavigator api_nav = api_doc.CreateNavigator ();

      XPathNodeIterator change_node_type_iter = meta_nav.Select ("/metadata/change-node-type");
      while (change_node_type_iter.MoveNext ()) {
        string path = change_node_type_iter.Current.GetAttribute ("path", "");
        XPathNodeIterator api_iter = api_nav.Select (path);
        bool matched = false;
        while (api_iter.MoveNext ()) {
          XmlElement node = ( (IHasXmlNode) api_iter.Current).GetNode () as XmlElement;
          XmlElement parent = node.ParentNode as XmlElement;
          XmlElement new_node = api_doc.CreateElement (change_node_type_iter.Current.Value);

          foreach (XmlNode child in node.ChildNodes)
            new_node.AppendChild (child.Clone ());
          foreach (XmlAttribute attribute in node.Attributes)
            new_node.Attributes.Append ( (XmlAttribute) attribute.Clone ());

          parent.ReplaceChild (new_node, node);
          matched = true;
        }
        if (!matched)
          Console.WriteLine ("Warning: <change-node-type path=\"{0}\"/> matched no nodes", path);
      }


      XPathNodeIterator add_iter = meta_nav.Select ("/metadata/add-node");
      while (add_iter.MoveNext ()) {
        string path = add_iter.Current.GetAttribute ("path", "");
        XPathNodeIterator api_iter = api_nav.Select (path);
        bool matched = false;
        while (api_iter.MoveNext ()) {
          XmlElement api_node = ( (IHasXmlNode) api_iter.Current).GetNode () as XmlElement;
          foreach (XmlNode child in ( (IHasXmlNode) add_iter.Current).GetNode().ChildNodes)
            api_node.AppendChild (api_doc.ImportNode (child, true));
          matched = true;
        }
        if (!matched)
          Console.WriteLine ("Warning: <add-node path=\"{0}\"/> matched no nodes", path);
      }

      XPathNodeIterator move_iter = meta_nav.Select ("/metadata/move-node");
      while (move_iter.MoveNext ()) {
        string path = move_iter.Current.GetAttribute ("path", "");
        XPathExpression expr = api_nav.Compile (path);
        string parent = move_iter.Current.Value;
        XPathNodeIterator parent_iter = api_nav.Select (parent);
        bool matched = false;
        while (parent_iter.MoveNext ()) {
          XmlNode parent_node = ( (IHasXmlNode) parent_iter.Current).GetNode ();
          XPathNodeIterator path_iter = parent_iter.Current.Clone ().Select (expr);
          while (path_iter.MoveNext ()) {
            XmlNode node = ( (IHasXmlNode) path_iter.Current).GetNode ();
            parent_node.AppendChild (node.Clone ());
            node.ParentNode.RemoveChild (node);
          }
          matched = true;
        }
        if (!matched)
          Console.WriteLine ("Warning: <move-node path=\"{0}\"/> matched no nodes", path);
      }

      XPathNodeIterator rmv_iter = meta_nav.Select ("/metadata/remove-node");
      while (rmv_iter.MoveNext ()) {
        string path = rmv_iter.Current.GetAttribute ("path", "");
        XPathNodeIterator api_iter = api_nav.Select (path);
        bool matched = false;
        while (api_iter.MoveNext ()) {
          XmlElement api_node = ( (IHasXmlNode) api_iter.Current).GetNode () as XmlElement;
          api_node.ParentNode.RemoveChild (api_node);
          matched = true;
        }
        if (!matched)
          Console.WriteLine ("Warning: <remove-node path=\"{0}\"/> matched no nodes", path);
      }

      XPathNodeIterator attr_iter = meta_nav.Select ("/metadata/attr");
      while (attr_iter.MoveNext ()) {
        string path = attr_iter.Current.GetAttribute ("path", "");
        string attr_name = attr_iter.Current.GetAttribute ("name", "");
        XPathNodeIterator api_iter = api_nav.Select (path);
        bool matched = false;
        while (api_iter.MoveNext ()) {
          XmlElement node = ( (IHasXmlNode) api_iter.Current).GetNode () as XmlElement;
          node.SetAttribute (attr_name, attr_iter.Current.Value);
          matched = true;
        }
        if (!matched)
          Console.WriteLine ("Warning: <attr path=\"{0}\"/> matched no nodes", path);
      }

      XPathNodeIterator remove_attr_iter = meta_nav.Select ("/metadata/remove-attr");
      while (remove_attr_iter.MoveNext ()) {
        string path = remove_attr_iter.Current.GetAttribute ("path", "");
        string name = remove_attr_iter.Current.GetAttribute ("name", "");
        XPathNodeIterator api_iter = api_nav.Select (path);
        bool matched = false;
        while (api_iter.MoveNext ()) {
          XmlElement node = ( (IHasXmlNode) api_iter.Current).GetNode () as XmlElement;

          node.RemoveAttribute (name);
          matched = true;
        }
        if (!matched)
          Console.WriteLine ("Warning: <remove-attr path=\"{0}\"/> matched no nodes", path);
      }

      if (symbol_doc != null) {
        XPathNavigator symbol_nav = symbol_doc.CreateNavigator ();
        XPathNodeIterator iter = symbol_nav.Select ("/api/*");
        while (iter.MoveNext ()) {
          XmlNode sym_node = ( (IHasXmlNode) iter.Current).GetNode ();
          XPathNodeIterator parent_iter = api_nav.Select ("/api");
          if (parent_iter.MoveNext ()) {
            XmlNode parent_node = ( (IHasXmlNode) parent_iter.Current).GetNode ();
            parent_node.AppendChild (api_doc.ImportNode (sym_node, true));
          }
        }
      }

      api_doc.Save (api_filename);
      return 0;
    }
  }
}