#include <keyboardeventhandler.h>


KeyboardEventHandler::KeyboardEventHandler( int nTimesteps, float tps)
{
    _paused = DEF_PAUSED_START;
    _direction = 1;
    _ntimesteps = nTimesteps;
    _tps = tps;
    _tpsorig = tps;
    _timestepchanged = false;
    _timestep = 0;
    _prevtime = 0;
    _togglewireframe = false;
    _toggleculling = false;
}


bool KeyboardEventHandler::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&)
{
    bool handled = false;

    if( ea.getEventType() == osgGA::GUIEventAdapter::KEYDOWN )
    {
	switch( ea.getKey() )
	    {
	    case osgGA::GUIEventAdapter::KEY_Space:
		_paused = _paused ? false : true;
		handled = true;
		break;

	    case osgGA::GUIEventAdapter::KEY_Up:
		if( !_paused ) _tps *= 1.5;
		handled = true;
		break;

	    case osgGA::GUIEventAdapter::KEY_Down:
		if( !_paused ) _tps /= 1.5;
		handled = true;
		break;

	    case 'r':
		_paused = DEF_PAUSED_START;
		_tps = _tpsorig;
		_timestep = 0;
		_timestepchanged = true;
		handled = true;
		break;

	    case osgGA::GUIEventAdapter::KEY_Right:
		if( _paused )
		{
		    _timestep = (_timestep+1) % _ntimesteps;
		    _timestepchanged = true;
		}
		else
		    _direction = +1;
		handled = true;
		break;

	    case osgGA::GUIEventAdapter::KEY_Left:
		if( _paused ) 
		{
		    _timestep = _timestep-1;
		    if( _timestep < 0 ) _timestep = _ntimesteps-1;
		    _timestepchanged = true;
		}
		else
		    _direction = -1;
		handled = true;
		break;

	    case 'w':
		_togglewireframe = true;
		handled = true;
		break;

	    case 'c':
		_toggleculling = true;
		handled = true;
		break;


	    }

    }
    return handled;
}


void KeyboardEventHandler::setTime( float time)
{
    if( !isPaused()  &&  time - _prevtime > 1.0/_tps )
    {
	_prevtime = time;
	_timestep = _timestep + _direction;
	if( _timestep == _ntimesteps ) 
	    _timestep = 0;
	else if( _timestep < 0 ) 
	    _timestep = _ntimesteps-1;
	_timestepchanged = true;
    }
}


bool KeyboardEventHandler::timestepChanged()
{
    if( _timestepchanged )
    {
	_timestepchanged = false;
	return true;
    }
    return false;
}


bool KeyboardEventHandler::toggleWireframe()
{
    if( _togglewireframe )
    {
	_togglewireframe = false;
	return true;
    }
    return false;
}


bool KeyboardEventHandler::toggleCulling()
{
    if( _toggleculling )
    {
        _toggleculling = false;
        return true;
    }
    return false;
}