/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant 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.

   GtkRadiant 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 GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined( INCLUDED_ORIGIN_H )
#define INCLUDED_ORIGIN_H

#include "ientity.h"

#include "math/matrix.h"
#include "generic/callback.h"
#include "stringio.h"

const Vector3 ORIGINKEY_IDENTITY = Vector3(0, 0, 0);

inline void default_origin(Vector3 &origin)
{
    origin = ORIGINKEY_IDENTITY;
}

inline void read_origin(Vector3 &origin, const char *value)
{
    if (!string_parse_vector3(value, origin)) {
        default_origin(origin);
    }
}

inline void write_origin(const Vector3 &origin, Entity *entity, const char *key)
{
    char value[64];
    sprintf(value, "%f %f %f", origin[0], origin[1], origin[2]);
    entity->setKeyValue(key, value);
}

inline Vector3 origin_translated(const Vector3 &origin, const Vector3 &translation)
{
    return matrix4_get_translation_vec3(
            matrix4_multiplied_by_matrix4(
                    matrix4_translation_for_vec3(origin),
                    matrix4_translation_for_vec3(translation)
            )
    );
}

inline Vector3 origin_snapped(const Vector3 &origin, float snap)
{
    return vector3_snapped(origin, snap);
}

class OriginKey {
    Callback<void()> m_originChanged;
public:
    Vector3 m_origin;


    OriginKey(const Callback<void()> &originChanged)
            : m_originChanged(originChanged), m_origin(ORIGINKEY_IDENTITY)
    {
    }

    void originChanged(const char *value)
    {
        read_origin(m_origin, value);
        m_originChanged();
    }

    typedef MemberCaller<OriginKey, void(const char *), &OriginKey::originChanged> OriginChangedCaller;


    void write(Entity *entity) const
    {
        write_origin(m_origin, entity, "origin");
    }
};


#include "scenelib.h"

inline BrushDoom3 *Node_getBrushDoom3(scene::Node &node)
{
    return NodeTypeCast<BrushDoom3>::cast(node);
}

inline void BrushDoom3_setDoom3GroupOrigin(scene::Node &node, const Vector3 &origin)
{
    BrushDoom3 *brush = Node_getBrushDoom3(node);
    if (brush != 0) {
        brush->setDoom3GroupOrigin(origin);
    }
}

class SetDoom3GroupOriginWalker : public scene::Traversable::Walker {
    const Vector3 &m_origin;
public:
    SetDoom3GroupOriginWalker(const Vector3 &origin) : m_origin(origin)
    {
    }

    bool pre(scene::Node &node) const
    {
        BrushDoom3_setDoom3GroupOrigin(node, m_origin);
        return true;
    }
};

class Doom3GroupOrigin : public scene::Traversable::Observer {
    scene::Traversable &m_set;
    const Vector3 &m_origin;
    bool m_enabled;

public:
    Doom3GroupOrigin(scene::Traversable &set, const Vector3 &origin) : m_set(set), m_origin(origin), m_enabled(false)
    {
    }

    void enable()
    {
        m_enabled = true;
        originChanged();
    }

    void disable()
    {
        m_enabled = false;
    }

    void originChanged()
    {
        if (m_enabled) {
            m_set.traverse(SetDoom3GroupOriginWalker(m_origin));
        }
    }

    void insert(scene::Node &node)
    {
        if (m_enabled) {
            BrushDoom3_setDoom3GroupOrigin(node, m_origin);
        }
    }

    void erase(scene::Node &node)
    {
        if (m_enabled) {
            BrushDoom3_setDoom3GroupOrigin(node, Vector3(0, 0, 0));
        }
    }
};


#endif