/***************************************************************************
 *                                                                         *
 *   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 <chmxx.h>

#include <klocale.h>

#include <qheader.h>
#include <qtimer.h>
#include <qregexp.h>
#include <qtextcodec.h>

#include "TopicTree.h"
#include "TopicLeaf.h"
#include "Def.h"
#include "Index.h"

TopicTree::TopicTree( QWidget* parent, const char* name ):
	KListView( parent, name ),
	d_index( new Index() ),
	d_codec( 0 )
{
	addColumn( i18n( "Topic" ) );
	setRootIsDecorated( true );
	setSorting( -1 );
	header()->hide();
	
	setFullWidth( true );
	setSizePolicy( QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding );
	connect( this, SIGNAL(doubleClicked(QListViewItem*,const QPoint&,int)),
		this, SLOT(slotDoubleClicked(QListViewItem*)) );
}

TopicTree::~TopicTree()
{	
	delete d_index;
}

void TopicTree::slotLoad( chm::chmfile* file )
{
	clear();
	const chm::chm_topics_tree* tree = file->get_topics_tree();

	
	QString encoding;
	bool encoding_detected = false;
	QRegExp rx( "(<.*META.*CHARSET *= *)(.*)(;|>|\")", false );
//	QRegExp rx1( "CHARSET *= *(.*)(?:;|\"|>)", false );
	rx.setMinimal( true );
	
	if ( tree )
	{
		for ( std::list< chm::chm_topics_tree* >::const_reverse_iterator i = tree->children.rbegin(); i != tree->children.rend(); ++i )
		{
			if ( !encoding_detected )
			{
				if ( file->file_exists( (*i)->path ) )
				{		
					std::streamsize size = file->file_size( (*i)->path );
					size = size > 1000?1000:size;
					
					std::auto_ptr<char> buf( new char[size + 1] );
					file->read( (*i)->path, buf.get(), size );
					buf.get()[size] = 0;
					
					QString st = QString::fromLatin1( buf.get() );
					delete buf.release();
					
					if ( rx.search( st ) != -1 )
					{
						QString enc = rx.cap( 2 );
						
						d_codec = QTextCodec::codecForName( enc.latin1() );
						
						if ( d_codec )
						{
							encoding_detected = true;
						}
					}
				}
			}
			
			new TopicLeaf( this, *i, d_index );
		}
	}

	updateCodec();
	QTimer::singleShot( 300, this, SLOT(slotLoadDelayed()) );
}

void TopicTree::slotGoUp()
{
	QListViewItem* item = currentItem();
	
	if ( !item )
	{
		return;
	}
	
	item = item->parent();
	
	if ( !item )
	{
		return;
	}
	
	setCurrentItem( item );
}

void TopicTree::slotLoadDelayed()
{
	home();
}

TopicLeaf* TopicTree::find( const QString& url )
{
	return d_index->find( url.latin1() );
}

void TopicTree::home()
{
	QListViewItem* item = firstChild();
	
	if ( item )
	{
		ensureItemVisible( item );
		setCurrentItem( item );
	}
}

void TopicTree::slotDoubleClicked( QListViewItem* item )
{
	if ( item )
	{
		item->setOpen( !item->isOpen() );
	}
}

QTextCodec* TopicTree::getCodec()
{
	if ( d_codec )
	{
		return d_codec;
	}
	
	return QTextCodec::codecForLocale();
}

void TopicTree::setCodec( QTextCodec* codec )
{
	if ( codec != d_codec )
	{
		d_codec = codec;
		updateCodec();
	}
}

void TopicTree::updateCodec()
{
	QListViewItemIterator it( this );
	while ( it.current() ) {
		((TopicLeaf*)(*it))->updateCodec();
		++it;
	}
}

#include "TopicTree.moc"