/*********
*
* This file is part of BibleTime's source code, http://www.bibletime.info/.
*
* Copyright 1999-2006 by the BibleTime developers.
* The BibleTime source code is licensed under the GNU General Public License version 2.0.
*
**********/



#include "ckeychooser.h"
#include "backend/cswordmoduleinfo.h"
#include "backend/cswordbiblemoduleinfo.h"
#include "backend/cswordcommentarymoduleinfo.h"
#include "backend/cswordlexiconmoduleinfo.h"

#include "clexiconkeychooser.h"
#include "cbiblekeychooser.h"
#include "cbookkeychooser.h"

CKeyChooser::CKeyChooser(ListCSwordModuleInfo, CSwordKey *, TQWidget *parent, const char *name )
: TQWidget(parent, name),
m_inHistoryFunction(false) {}

CKeyChooser::~CKeyChooser() {}

CKeyChooser* CKeyChooser::createInstance(ListCSwordModuleInfo modules, CSwordKey *key, TQWidget *parent) {
	if (!modules.count()) {
		return 0;
	}

	CKeyChooser* ck = 0;
	switch ( modules.first()->type() ) {
		case CSwordModuleInfo::Commentary:  //Bibles and commentaries uise the same key chooser
		case CSwordModuleInfo::Bible:
		ck = new CBibleKeyChooser(modules,key,parent);
		break;
		case CSwordModuleInfo::Lexicon:
		ck = new CLexiconKeyChooser(modules,key,parent);
		break;
		case CSwordModuleInfo::GenericBook:
		ck = new CBookKeyChooser(modules,key,parent);
		break;
		default:
		return 0;
	}
	return ck;
}

void CKeyChooser::backInHistory() {
	backInHistory(1);
}

void CKeyChooser::backInHistory(int count) {
	m_inHistoryFunction = true;
	//  qWarning("go back %d items in history", count);

	Q_ASSERT(m_prevKeyHistoryList.size());

	TQStringList::iterator it = m_prevKeyHistoryList.begin();

	//pop_front count items, the top item is then the new current key
	int index = count;
	while ((index > 0) && (it != m_prevKeyHistoryList.end())) {
		//    qWarning("pop_front");

		m_nextKeyHistoryList.prepend(*it);
		it = m_prevKeyHistoryList.remove(it);
		--index;
	}

	//the first item is now the item which should be set as key
	if (it != m_nextKeyHistoryList.end() && key()) {
		CSwordKey* k = key();
		k->key(*it);
		setKey(k);
	}

	m_inHistoryFunction = false;
}

void CKeyChooser::forwardInHistory() {
	forwardInHistory(1);
}

void CKeyChooser::forwardInHistory(int count) {
	m_inHistoryFunction = true;
	//  qWarning("go forward %d items in history", count);

	Q_ASSERT(m_nextKeyHistoryList.size());

	TQStringList::iterator it = m_nextKeyHistoryList.begin();
	//pop_front count-1 items, the top item is then the new current key
	int index = count;
	while (index > 0 && it != m_nextKeyHistoryList.end()) {
		//    qWarning("pop_front");

		m_prevKeyHistoryList.prepend(*it);
		it = m_nextKeyHistoryList.remove(it);
		--index;
	}

	//the first item of the back list is now the new key
	it = m_prevKeyHistoryList.begin();
	if (it != m_prevKeyHistoryList.end() && key()) {
		CSwordKey* k = key();
		k->key(*it);
		setKey(k);
	}

	m_inHistoryFunction = false;
}

void CKeyChooser::addToHistory(CSwordKey* k) {
	//  qWarning("addToHistory");

	Q_ASSERT(!m_inHistoryFunction);
	if (k && !m_inHistoryFunction) {
		Q_ASSERT(k->key() == key()->key());
		m_prevKeyHistoryList.prepend(k->key());
	}

	emit historyChanged();
}

const TQStringList CKeyChooser::getPreviousKeys() const {
	TQStringList ret = m_prevKeyHistoryList;
	if (ret.size() >= 1) {
	ret.pop_front(); //the first item always is equal to the current key
	}

	return ret;
}

const TQStringList CKeyChooser::getNextKeys() const {
	return m_nextKeyHistoryList;
}


/*!
    \fn CKeyChooser::polish()
 */
void CKeyChooser::polish() {
	TQWidget::polish();

	//connect the history calls just before we show, we want an empty history
	connect(this, TQT_SIGNAL(keyChanged(CSwordKey*)), TQT_SLOT(addToHistory(CSwordKey*)));
}