/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2009 Tatsuhiro Tsujikawa
 *
 * This program 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.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#include "Xml2XmlRpcRequestProcessor.h"

#include <stack>

#include <libxml/parser.h>

#include "XmlRpcRequestParserStateMachine.h"
#include "util.h"
#include "DlAbortEx.h"
#include "message.h"

namespace aria2 {

namespace xmlrpc {

struct SessionData {
  XmlRpcRequestParserStateMachine* _stm;

  std::stack<std::string> _charactersStack;

  SessionData(XmlRpcRequestParserStateMachine* stm):_stm(stm) {}
};

static void mlStartElement(void* userData, const xmlChar* name,
                           const xmlChar** attrs)
{
  SessionData* sd = reinterpret_cast<SessionData*>(userData);
  std::map<std::string, std::string> attrmap;
  if(attrs) {
    const xmlChar** p = attrs;
    while(*p != 0) {
      std::string name = reinterpret_cast<const char*>(*p);
      ++p;
      if(*p == 0) {
        break;
      }
      std::string value = util::trim(reinterpret_cast<const char*>(*p));
      ++p;
      attrmap[name] = value;
    }
  }
  sd->_stm->beginElement(reinterpret_cast<const char*>(name), attrmap);
  if(sd->_stm->needsCharactersBuffering()) {
    sd->_charactersStack.push(std::string());
  }
}

static void mlEndElement(void* userData, const xmlChar* name)
{
  SessionData* sd = reinterpret_cast<SessionData*>(userData);
  std::string characters;
  if(sd->_stm->needsCharactersBuffering()) {
    characters = util::trim(sd->_charactersStack.top());
    sd->_charactersStack.pop();
  }
  sd->_stm->endElement(reinterpret_cast<const char*>(name), characters);
}

static void mlCharacters(void* userData, const xmlChar* ch, int len)
{
  SessionData* sd = reinterpret_cast<SessionData*>(userData);
  if(sd->_stm->needsCharactersBuffering()) {
    sd->_charactersStack.top() += std::string(&ch[0], &ch[len]);
  }
}

static xmlSAXHandler mySAXHandler =
  {
    0, // internalSubsetSAXFunc
    0, // isStandaloneSAXFunc
    0, // hasInternalSubsetSAXFunc
    0, // hasExternalSubsetSAXFunc
    0, // resolveEntitySAXFunc
    0, // getEntitySAXFunc
    0, // entityDeclSAXFunc
    0, // notationDeclSAXFunc
    0, // attributeDeclSAXFunc
    0, // elementDeclSAXFunc
    0, //   unparsedEntityDeclSAXFunc
    0, //   setDocumentLocatorSAXFunc
    0, //   startDocumentSAXFunc
    0, //   endDocumentSAXFunc
    &mlStartElement, //   startElementSAXFunc
    &mlEndElement, //   endElementSAXFunc
    0, //   referenceSAXFunc
    &mlCharacters, //   charactersSAXFunc
    0, //   ignorableWhitespaceSAXFunc
    0, //   processingInstructionSAXFunc
    0, //   commentSAXFunc
    0, //   warningSAXFunc
    0, //   errorSAXFunc
    0, //   fatalErrorSAXFunc
    0, //   getParameterEntitySAXFunc
    0, //   cdataBlockSAXFunc
    0, //   externalSubsetSAXFunc
    0, //   unsigned int        initialized
    0, //   void *      _private
    0, //   startElementNsSAX2Func
    0, //   endElementNsSAX2Func
    0, //   xmlStructuredErrorFunc
  };

XmlRpcRequest
XmlRpcRequestProcessor::parseMemory(const std::string& xml)
{
  _stm.reset(new XmlRpcRequestParserStateMachine());
  SharedHandle<SessionData> sessionData(new SessionData(_stm.get()));

  int r = xmlSAXUserParseMemory(&mySAXHandler, sessionData.get(),
                                xml.data(), xml.size());
  if(r != 0) {
    throw DL_ABORT_EX(MSG_CANNOT_PARSE_XML_RPC_REQUEST);
  }
  return XmlRpcRequest(_stm->getMethodName(), _stm->getCurrentFrameValue());
}

} // namespace xmlrpc

} // namespace aria2