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/*
 *  Copyright (C) 2007, 2008, 2009 Juan Pedro Bolívar Puente
 *
 *  This file is part of Psychosynth.
 *   
 *  Psychosynth 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  Psychosynth 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef PSYNTH_CONFBACKENDXML_H
#define PSYNTH_CONFBACKENDXML_H

#include <string>

#include <libxml/xmlreader.h>
#include <libxml/xmlwriter.h>

#include <psynth/base/type_value.hpp>
#include <psynth/base/config.hpp>
#include <psynth/base/conf_backend_xml_fwd.hpp>

namespace psynth
{
namespace base
{

PSYNTH_DECLARE_ERROR (config_error, config_xml_error)
PSYNTH_DECLARE_ERROR (config_xml_error, config_xml_type_error)
PSYNTH_DECLARE_ERROR (config_xml_error, config_xml_io_error)

class conf_backend_xml : public conf_backend
{
public:
    conf_backend_xml (const std::string& file)
        : m_file(file)
    {}

    ~conf_backend_xml () {}

    void set_file (const std::string& file)
    {
        m_file = file;
    }

    const std::string& get_file ()
    {
        return m_file;
    }

    void attach (conf_node& node) {};

    void datach (conf_node& node) {};

    void save (conf_node& node);

    void load (conf_node& node)
    {
        m_overwrite = true;
        do_load (node);
    }

    void def_load (conf_node& node)
    {
        m_overwrite = false;
        do_load (node);
    }

    void handle_conf_change (conf_node& c) {};

    void handle_conf_nudge (conf_node& c) {};

    void handle_conf_add_child (conf_node& c) {};

    void handle_conf_del_child (conf_node& c) {};

private:
    type_value m_current_type;
    
    std::string m_file;
    bool m_overwrite;
    
    conf_node* process_new_element (xmlTextReaderPtr reader, conf_node* node);
    conf_node* process_text (xmlTextReaderPtr reader, conf_node* node);
    conf_node* process_end_element (xmlTextReaderPtr reader, conf_node* node);
    conf_node* process (xmlTextReaderPtr reader, conf_node* node);

    void do_load (conf_node& node);
    
    void expand (xmlTextWriterPtr writer, conf_node& node);
    void expand_childs (xmlTextWriterPtr writer, conf_node& node);
    void expand_value (xmlTextWriterPtr writer, conf_node& node);
};

} /* namespace base */
} /* namespace psynth */

#endif /* PSYNTH_CONFBACKENDXML_H */