/*
 * DOMParser.cpp
 *****************************************************************************
 * Copyright (C) 2010 - 2011 Klagenfurt University
 *
 * Created on: Aug 10, 2010
 * Authors: Christopher Mueller <christopher.mueller@itec.uni-klu.ac.at>
 *          Christian Timmerer  <christian.timmerer@itec.uni-klu.ac.at>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "DOMParser.h"

#include <vector>
#include <stack>
#include <vlc_xml.h>

using namespace adaptive::xml;

DOMParser::DOMParser() :
    root( nullptr ),
    stream( nullptr ),
    vlc_reader( nullptr )
{
}

DOMParser::DOMParser    (stream_t *stream) :
    root( nullptr ),
    stream( stream ),
    vlc_reader( nullptr )
{
}

DOMParser::~DOMParser   ()
{
    delete this->root;
    if(this->vlc_reader)
        xml_ReaderDelete(this->vlc_reader);
}

Node*   DOMParser::getRootNode              ()
{
    return this->root;
}
bool    DOMParser::parse                    (bool b)
{
    if(!stream)
        return false;

    if(!vlc_reader && !(vlc_reader = xml_ReaderCreate(stream, stream)))
        return false;

    const int i_flags = vlc_reader->obj.flags;
    if(!b)
        vlc_reader->obj.flags |= OBJECT_FLAGS_QUIET;
    root = processNode(b);
    vlc_reader->obj.flags = i_flags;
    if ( root == nullptr )
        return false;

    return true;
}

bool DOMParser::reset(stream_t *s)
{
    stream = s;
    if(!vlc_reader)
        return true;
    delete root;
    root = nullptr;
    vlc_reader = xml_ReaderReset(vlc_reader, s);
    return !!vlc_reader;
}

Node* DOMParser::processNode(bool b_strict)
{
    const char *data;
    int type;
    std::stack<Node *> lifo;

    while( (type = xml_ReaderNextNode(vlc_reader, &data)) > 0 )
    {
        switch(type)
        {
            case XML_READER_STARTELEM:
            {
                bool empty = xml_ReaderIsEmptyElement(vlc_reader);
                Node *node = new (std::nothrow) Node();
                if(node)
                {
                    if(!lifo.empty())
                        lifo.top()->addSubNode(node);
                    lifo.push(node);

                    node->setName(std::string(data));
                    addAttributesToNode(node);
                }

                if(empty && lifo.size() > 1)
                    lifo.pop();
                break;
            }

            case XML_READER_TEXT:
            {
                if(!lifo.empty())
                    lifo.top()->setText(std::string(data));
                break;
            }

            case XML_READER_ENDELEM:
            {
                if(lifo.empty())
                    return nullptr;

                Node *node = lifo.top();
                lifo.pop();
                if(lifo.empty())
                    return node;
            }

            default:
                break;
        }
    }

    while( lifo.size() > 1 )
        lifo.pop();

    Node *node = (!lifo.empty()) ? lifo.top() : nullptr;

    if(b_strict && node)
    {
        delete node;
        return nullptr;
    }

    return node;
}

void    DOMParser::addAttributesToNode      (Node *node)
{
    const char *attrValue;
    const char *attrName;

    while((attrName = xml_ReaderNextAttr(this->vlc_reader, &attrValue)) != nullptr)
    {
        std::string key     = attrName;
        std::string value   = attrValue;
        node->addAttribute(key, value);
    }
}
void    DOMParser::print                    (Node *node, int offset)
{
    for(int i = 0; i < offset; i++)
        msg_Dbg(this->stream, " ");

    msg_Dbg(this->stream, "%s", node->getName().c_str());

    std::vector<std::string> keys = node->getAttributeKeys();

    for(size_t i = 0; i < keys.size(); i++)
        msg_Dbg(this->stream, " %s=%s", keys.at(i).c_str(), node->getAttributeValue(keys.at(i)).c_str());

    msg_Dbg(this->stream, "\n");

    offset++;

    for(size_t i = 0; i < node->getSubNodes().size(); i++)
    {
        this->print(node->getSubNodes().at(i), offset);
    }
}
void    DOMParser::print                    ()
{
    this->print(this->root, 0);
}