// Copyright (C) 2013  James Turner
//
// 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.

#ifndef NASAL_MODEL_DATA_HXX
#define NASAL_MODEL_DATA_HXX

#include <simgear/nasal/nasal.h>
#include <simgear/scene/model/modellib.hxx>

using std::string;

/** Nasal model data container.
 * load and unload methods must be run in main thread (not thread-safe). */
class FGNasalModelData : public SGReferenced
{
public:
    /** Constructor to be run in an arbitrary thread. */
    FGNasalModelData(SGPropertyNode *root, const string& path, SGPropertyNode *prop,
                     SGPropertyNode* load, SGPropertyNode* unload) :
    _path(path),
    _root(root), _prop(prop),
    _load(load), _unload(unload)
    {
    }
    
    /** Load hook. Always call from inside the main loop. */
    void load();
    
    /** Unload hook. Always call from inside the main loop. */
    void unload();
    
private:
    static unsigned int _module_id;
    
    string _module, _path;
    SGPropertyNode_ptr _root, _prop;
    SGConstPropertyNode_ptr _load, _unload;
};

/** Thread-safe proxy for FGNasalModelData.
 * modelLoaded/destroy methods only register the requested
 * operation. Actual (un)loading of Nasal module is deferred
 * and done in the main loop. */
class FGNasalModelDataProxy : public simgear::SGModelData
{
public:
    FGNasalModelDataProxy(SGPropertyNode *root = 0) :
    _root(root), _data(0)
    {
    }
    
    ~FGNasalModelDataProxy();
    
    void modelLoaded(const string& path, SGPropertyNode *prop, osg::Node *);
    
protected:
    SGPropertyNode_ptr _root;
    SGSharedPtr<FGNasalModelData> _data;
};

#endif // of NASAL_MODEL_DATA_HXX