/*
   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_ANGLES_H )
#define INCLUDED_ANGLES_H

#include "ientity.h"

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

#include "angle.h"

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

inline void default_angles( Vector3& angles ){
	angles = ANGLESKEY_IDENTITY;
}
inline void normalise_angles( Vector3& angles ){
	angles[0] = static_cast<float>( float_mod( angles[0], 360 ) );
	angles[1] = static_cast<float>( float_mod( angles[1], 360 ) );
	angles[2] = static_cast<float>( float_mod( angles[2], 360 ) );
}
inline void read_angle( Vector3& angles, const char* value ){
	if ( !string_parse_float( value, angles[2] ) ) {
		default_angles( angles );
	}
	else
	{
		angles[0] = 0;
		angles[1] = 0;
		normalise_angles( angles );
	}
}
inline void read_angles( Vector3& angles, const char* value ){
	if ( !string_parse_vector3( value, angles ) ) {
		default_angles( angles );
	}
	else
	{
		angles = Vector3( angles[2], angles[0], angles[1] );
		normalise_angles( angles );
	}
}
inline void write_angles( const Vector3& angles, Entity* entity ){
	if ( angles[0] == 0
		 && angles[1] == 0
		 && angles[2] == 0 ) {
		entity->setKeyValue( "angle", "" );
		entity->setKeyValue( "angles", "" );
	}
	else
	{
		char value[64];

		if ( angles[0] == 0 && angles[1] == 0 ) {
			float yaw = angles[2];
			entity->setKeyValue( "angles", "" );
			write_angle( yaw, entity );
		}
		else
		{
			sprintf( value, "%f %f %f", angles[1], angles[2], angles[0] );
			entity->setKeyValue( "angle", "" );
			entity->setKeyValue( "angles", value );
		}
	}
}

inline Vector3 angles_rotated( const Vector3& angles, const Quaternion& rotation ){
	return matrix4_get_rotation_euler_xyz_degrees(
			   matrix4_multiplied_by_matrix4(
				   matrix4_rotation_for_euler_xyz_degrees( angles ),
				   matrix4_rotation_for_quaternion_quantised( rotation )
				   )
			   );
}

class AnglesKey
{
Callback<void()> m_anglesChanged;
public:
Vector3 m_angles;


AnglesKey( const Callback<void()>& anglesChanged )
	: m_anglesChanged( anglesChanged ), m_angles( ANGLESKEY_IDENTITY ){
}

void angleChanged( const char* value ){
	read_angle( m_angles, value );
	m_anglesChanged();
}
typedef MemberCaller<AnglesKey, void(const char*), &AnglesKey::angleChanged> AngleChangedCaller;

void anglesChanged( const char* value ){
	read_angles( m_angles, value );
	m_anglesChanged();
}
typedef MemberCaller<AnglesKey, void(const char*), &AnglesKey::anglesChanged> AnglesChangedCaller;

void write( Entity* entity ) const {
	write_angles( m_angles, entity );
}
};


#endif
