// src/backend/serialize_visitor.cc - Copyright 2005, 2006, University
//               of Padova, dept. of Pure and Applied
//               Mathematics
//
// This file is part of SGPEMv2.
//
// This is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

#include "xml_serializer.hh"
#include "xml_visitor.hh"
#include "xml_serializer_factory.hh"

#include "string_utils.hh"
#include "environment.hh"
#include "history.hh"
/* 
#include "backend/concrete_environment.hh"
#include "backend/concrete_history.hh"
*/
#include "backend/process.hh"
#include "backend/serializer_error.hh"

using namespace sgpem;



#include <iostream>
using namespace std;




XMLSerializer::~XMLSerializer()
{
}

XMLSerializer::XMLSerializer()
{
}



void XMLSerializer::save_snapshot(const Glib::ustring& filename, const History& hist)
{
  /* COMPAT: Do not genrate nodes for formatting spaces */
  LIBXML_TEST_VERSION
  xmlKeepBlanksDefault(0);
  
  xmlDocPtr doc;
  doc = xmlNewDoc((const xmlChar *)"1.0");
  if(doc!=NULL){
    fill_doc(doc, hist);
    int nwritten = xmlSaveFormatFile (filename.c_str(), doc, 1);
    if(nwritten<0)
    {
      throw SerializerError("Error writing xml doc to output stream.");
    }
  }
  else
  {
    throw SerializerError("Internal Error creating xml doc.");
  }
  
  /* Clean up everything else before quitting. */
  xmlCleanupParser();
}

void XMLSerializer::restore_snapshot(const Glib::ustring& filename, History& hist)
{
    // TODO - all to do!!
    // DEBUG - remove me when finished
    XMLSerializerFactory fact(hist);

#ifdef LIBXML_SAX1_ENABLED
    xmlDocPtr doc;
    
    LIBXML_TEST_VERSION
    xmlKeepBlanksDefault(0);

    /*
     * build an XML tree from a the file;
     */
    doc = xmlParseFile(filename.c_str());
    if (doc == NULL) {
      xmlCleanupParser();
      throw SerializerError("Parsing Error: doc is invalid.");
    }
    // read all elements and fill hist
    read_doc(doc, fact);

    // frees all xml related data
    xmlFreeDoc(doc);

    /* Clean up everything else before quitting. */
    xmlCleanupParser();

#else
    /*
     * the library has been compiled without some of the old interfaces
     */
    throw SerializerError("ERROR: Compilation with SAX1 must be enabled! (?)");
#endif /* LIBXML_SAX1_ENABLED */
}






const Glib::ustring XMLSerializer::get_filename_extension()
{
    return Glib::ustring("ocio");
}


const Glib::ustring XMLSerializer::get_filename_description()
{
    return Glib::ustring("SGPEMv2 XML formatted snapshot save file");
}

void XMLSerializer::fill_doc(xmlDocPtr doc, const History& hist)
{
    xmlNodePtr root_node = NULL;/* node pointers */
    /*
     * Creates a new document, a node and set it as a root node
     */
    root_node = xmlNewNode(NULL, (const xmlChar *) "sgpem");
    xmlDocSetRootElement(doc, root_node);

    /*
     * Creates a DTD declaration. Isn't mandatory. 
     */
    // dtd = xmlCreateIntSubset(doc, BAD_CAST "root", NULL, BAD_CAST "tree2.dtd");

    /* 
     * xmlNewChild() creates a new node, which is "attached" as child node
     * of root_node node. 
     */
    xmlNodePtr resources_node = xmlNewChild(root_node, NULL, (const xmlChar *) "resources", NULL);
    /* 
     * The same as above, but the new child node doesn't have a content 
     */
    xmlNodePtr schedulables_node = xmlNewChild(root_node, NULL, (const xmlChar *) "schedulables", NULL);

    fill_resources(resources_node, hist);
    fill_schedulables(schedulables_node, hist);
}

void XMLSerializer::fill_resources(xmlNodePtr resources_node, const History& hist)
{
    

    const Environment& env = hist.get_last_environment();

    const Environment::Resources& rvect = env.get_resources();
    typedef Environment::Resources::const_iterator res_iterator;
  
    res_iterator iter = rvect.begin();
    res_iterator end = rvect.end();
    while(iter!=end)
    {
      XMLVisitor xvisit(resources_node);
      Glib::ustring key;
      int_to_string((int)(*iter).first, key);
      xvisit.from_resource(*((*iter).second), key);
      iter++;
    }
}

void XMLSerializer::fill_schedulables(xmlNodePtr schedulables_node, const History& hist)
{
    

    const Environment& env = hist.get_last_environment();

    const Environment::Processes& pvect = env.get_processes();
    typedef std::vector<Process*>::const_iterator proc_iterator;
  
    proc_iterator iter = pvect.begin();
    proc_iterator end = pvect.end();
    while(iter!=end)
    {
      XMLVisitor xvisit(schedulables_node);
      xvisit.from_process(*(*iter));
      iter++;
    }
}

void XMLSerializer::read_doc(xmlDocPtr doc, XMLSerializerFactory& fact)
{
    /*
     * Check the document is of the right kind
     */
    xmlNodePtr root;
    root = xmlDocGetRootElement(doc);
    if (root == NULL) {
      xmlFreeDoc(doc);
      xmlCleanupParser();
      throw SerializerError("Reading Error: xml doc is empty.");
    }

    cout << "ROOT: " << root->name << endl;

    xmlNodePtr cur;
    cur = root->children;
    while(cur!=NULL)
    {
      cout << "NODE: " << cur->name << endl;
      
      Glib::ustring name((const char *)cur->name);
      if(name=="resources")
      {
        read_resources(cur, fact);
      }
      if(name=="schedulables")
      {
        read_schedulables(cur, fact);
      }
      cur = cur->next;
    }
}

XMLSerializerFactory::Parameters* read_properties(xmlAttrPtr prop)
{
  if(prop==NULL)
    return NULL;
    
  XMLSerializerFactory::Parameters* par=new XMLSerializerFactory::Parameters();
  while (prop != NULL) {
    // cout << "PROP: " << prop->name;

    if(prop->children && xmlNodeIsText(prop->children)){
      xmlChar *key = xmlNodeGetContent (prop->children);
      // xmlChar *key = xmlNodeListGetString(doc, prop->children, 1);
      if(key!=NULL)
      {
        // cout << " VALUE: " <<  key;
        std::pair<Glib::ustring, Glib::ustring> key_value(Glib::ustring((const char *)prop->name), Glib::ustring((const char *)key));
        par->insert(key_value);
        // c.insert(typename Cont::value_type(new_key, pos->second));
        cout << " pair PROP: " <<  key_value.first << " VALUE: " <<  key_value.second << endl;
        
        xmlFree(key);
      }
      else
        cout << " !VALUE IS NULL! ";
    }
    cout << endl;
    prop = prop->next;
  }
  return par;
}

void XMLSerializer::read_resources(xmlNodePtr resources_node, XMLSerializerFactory& fact)
{
    xmlNodePtr cur;
    cur = resources_node->children;
    while(cur!=NULL)
    {
      Glib::ustring node_name((const char *)cur->name);
      if(node_name=="resource")
      {
        cout << "NODE: " << cur->name << endl;
  
        xmlAttrPtr prop = cur->properties;
        XMLSerializerFactory::Parameters* par=read_properties(prop);
        if(par!=NULL)
        {
          fact.factory_method(Glib::ustring("Resource"), *par);
        }
        // fact.create_resource(*par);
      }

      cur = cur->next;
    }
}
void XMLSerializer::read_schedulables(xmlNodePtr schedulables_node, XMLSerializerFactory& fact)
{
    xmlNodePtr cur;
    cur = schedulables_node->children;
    while(cur!=NULL)
    {
      cout << "NODE: " << cur->name << endl;

      xmlAttrPtr prop = cur->properties;
      while (prop != NULL) {
        cout << "PROP: " << prop->name;
    
        if(prop->children && xmlNodeIsText(prop->children)){
          xmlChar *key = xmlNodeGetContent (prop->children);
          // xmlChar *key = xmlNodeListGetString(doc, prop->children, 1);
          if(key!=NULL)
          {
            cout << " VALUE: " <<  key;
            xmlFree(key);
          }
          else
            cout << " !VALUE IS NULL! ";
        }
        cout << endl;
        prop = prop->next;
      }

      cur = cur->next;
    }
}


/* comment */