/***************************************************************************
 *                                                                         *
 *   begin        : 15 Jan 2004                                            *
 *   copyright    : (C) 2003 by Samokhvalov Anton <red____hat@mail.ru> :)  *
 *                                                                         *
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include <History.h>

History::History():
	d_current_position( -1 ),
	d_enabled( true ),
	d_up( false ),
	d_back( false ),
	d_forward( false )
{
}

History::~History()
{
}

void History::add( const KURL& url )
{
	if ( !d_enabled )
	{
		return;
	}
	
	d_current_position++;
	d_urls.resize( d_current_position + 1 );
	d_urls[ d_current_position ] = url;
	
	if ( d_urls.size() >= 2 )
	{
		emitSignal( true, true, false );
	}
	else
	{
		emitSignal( true, false, false );
	}
}

void History::up()
{
	d_current_position = -1;
	d_urls.clear();

	emitSignal( true, false, false );
	emit goUp();
}

void History::back()
{
	if ( d_current_position >= 1 )
	{
		d_current_position--;
		emit changeUrl( d_urls[ d_current_position ] );
		if ( d_current_position <= 0 )
		{
			emitSignal( true, false, true );
		}
		else
		{
			emitSignal( true, true, true );
		}
	}
}

void History::forward()
{
	if ( d_current_position < (int)d_urls.size() - 1 )
	{
		d_current_position++;
		emit changeUrl( d_urls[ d_current_position ] );
		if ( d_current_position == ((int)d_urls.size() - 1) )
		{
			emitSignal( true, true, false );
		}
		else
		{
			emitSignal( true, true, true );
		}
	}
}

void History::clear()
{
	d_urls.clear();
	emitSignal( false, false, false );
}

void History::setEnabled( bool e )
{
	d_enabled = e;
}

void History::emitSignal()
{
	emit stateChanged( d_up, d_back, d_forward );
}

void History::emitSignal( bool a, bool b, bool c )
{
	d_up = a;
	d_back = b;
	d_forward = c;
	
	emitSignal();
}

#include "History.moc"