/*
   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_ANGLE_H )
#define INCLUDED_ANGLE_H

#include "ientity.h"

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

const float ANGLEKEY_IDENTITY = 0;

inline void default_angle(float &angle)
{
    angle = ANGLEKEY_IDENTITY;
}

inline void normalise_angle(float &angle)
{
    angle = static_cast<float>( float_mod(angle, 360.0));
}

inline void read_angle(float &angle, const char *value)
{
    if (!string_parse_float(value, angle)) {
        angle = 0;
    } else {
        normalise_angle(angle);
    }
}

inline void write_angle(float angle, Entity *entity)
{
    if (angle == 0) {
        entity->setKeyValue("angle", "");
    } else {
        char value[64];
        sprintf(value, "%f", angle);
        entity->setKeyValue("angle", value);
    }
}

class AngleKey {
    Callback<void()> m_angleChanged;
public:
    float m_angle;


    AngleKey(const Callback<void()> &angleChanged)
            : m_angleChanged(angleChanged), m_angle(ANGLEKEY_IDENTITY)
    {
    }

    void angleChanged(const char *value)
    {
        read_angle(m_angle, value);
        m_angleChanged();
    }

    typedef MemberCaller<AngleKey, void(const char *), &AngleKey::angleChanged> AngleChangedCaller;

    void write(Entity *entity) const
    {
        write_angle(m_angle, entity);
    }
};

inline float angle_rotated(float angle, const Quaternion &rotation)
{
    return matrix4_get_rotation_euler_xyz_degrees(
            matrix4_multiplied_by_matrix4(
                    matrix4_rotation_for_z_degrees(angle),
                    matrix4_rotation_for_quaternion_quantised(rotation)
            )
    ).z();
}

#endif