/*********
*
* This file is part of BibleTime's source code, http://www.bibletime.info/.
*
* Copyright 1999-2008 by the BibleTime developers.
* The BibleTime source code is licensed under the GNU General Public License version 2.0.
*
**********/



#include "clexiconkeychooser.h"

#include "bthistory.h"
#include "ckeychooserwidget.h"
#include "cscrollbutton.h"

#include "backend/drivers/cswordlexiconmoduleinfo.h"
#include "backend/keys/cswordldkey.h"
#include "backend/config/cbtconfig.h"
#include "util/cresmgr.h"

//STL headers
#include <algorithm>
#include <iterator>
#include <map>

#include <QHBoxLayout>


CLexiconKeyChooser::CLexiconKeyChooser(QList<CSwordModuleInfo*> modules, CSwordKey *key, QWidget *parent)
	: CKeyChooser(modules, key, parent),
	m_key(dynamic_cast<CSwordLDKey*>(key))
{
	setModules(modules, false);

	//we use a layout because the key chooser should be resized to full size
	m_layout = new QHBoxLayout(this);
	m_layout->setSpacing(0);
	m_layout->setContentsMargins(0,0,0,0);
	m_layout->setDirection(QBoxLayout::LeftToRight);
	m_layout->setSizeConstraint(QLayout::SetNoConstraint);

	m_widget = new CKeyChooserWidget(0, false, this);
	setFocusProxy(m_widget);

	//don't allow a too high width, try to keep as narrow as possible
	//to aid users with smaller screen resolutions
	m_widget->comboBox()->setMaximumWidth(200);

	m_widget->setToolTips(
		tr("Entries of the current work"),
		tr("Next entry"),
		tr("Scroll through the entries of the list. Press the button and move the mouse to increase or decrease the item."),
		tr("Previous entry")
	);

	m_layout->addWidget(m_widget,0,Qt::AlignLeft);

	connect(m_widget,SIGNAL(changed(int)),SLOT(activated(int)));
	connect(m_widget,SIGNAL(focusOut(int)),SLOT(activated(int)));

	setModules(modules, true);
	setKey(key);
	connect(this, SIGNAL(keyChanged(CSwordKey*)), history(), SLOT(add(CSwordKey*)) );
}

CSwordKey* CLexiconKeyChooser::key() {
	//  qWarning("key");
	return m_key;
}

void CLexiconKeyChooser::setKey(CSwordKey* key)
{
	qDebug("CLexiconKeyChooser::setKey");

	if (!(m_key = dynamic_cast<CSwordLDKey*>(key))) {
		return;
	}

	QString newKey = m_key->key();
	const int index = m_widget->comboBox()->findText(newKey);
	m_widget->comboBox()->setCurrentIndex(index);

	//   qWarning("setKey end");
	emit keyChanged( m_key);
}

void CLexiconKeyChooser::activated(int index) {
	//  qWarning("activated");
	const QString text = m_widget->comboBox()->itemText(index);

	// To prevent from eternal loop, because activated() is emitted again
	if (m_key && m_key->key() != text) {
		m_key->key(text);
		setKey(m_key);
	}
	//  qWarning("activated end");
}

inline bool my_cmpEntries(const QString& a, const QString& b) {
	return a < b;
}

/** Reimplementation. */
void CLexiconKeyChooser::refreshContent() {
	if (m_modules.count() == 1) {
		m_widget->reset(m_modules.first()->entries(), 0, true);
		//     qWarning("resetted");
	}
	else {
		typedef std::multimap<unsigned int, QStringList*> EntryMap;
		EntryMap entryMap;
		QStringList* entries = 0;
		QListIterator<CSwordLexiconModuleInfo*> mit(m_modules);
		while (mit.hasNext()) {
			entries = mit.next()->entries();
			entryMap.insert( std::make_pair(entries->count(), entries) );
		}

		QStringList goodEntries; //The string list which contains the entries which are available in all modules

		EntryMap::iterator it = entryMap.begin(); //iterator to go thoigh all selected modules
		QStringList refEntries = *(it->second); //copy the items for the first time
		QStringList* cmpEntries = ( ++it )->second; //list for comparision, starts with the second module in the map

		while(it != entryMap.end()) {
			std::set_intersection(
				refEntries.begin(), --(refEntries.end()), //--end() is the last valid entry
				cmpEntries->begin(), --(cmpEntries->end()),
				std::back_inserter(goodEntries), //append valid entries to the end of goodEntries
				my_cmpEntries  //ci_cmpEntries is the comparision function
			);

			cmpEntries = ( ++it )->second; //this is a pointer to the string list of a new module

			/*
			* use the good entries for next comparision,
			* because the final list can only have the entries of goodEntries as maxiumum
			*/
			refEntries = goodEntries;
		};

		m_widget->reset(goodEntries, 0, true); //write down the entries
	} //end of ELSE

}

/** No descriptions */
void CLexiconKeyChooser::adjustFont() {

}

/** Sets the module and refreshes the combo boxes */
void CLexiconKeyChooser::setModules( const QList<CSwordModuleInfo*>& modules, const bool refresh ) {

	while (!m_modules.isEmpty())
        	m_modules.takeFirst(); // not deleting the pointer

	QList<CSwordModuleInfo*>::const_iterator end_it = modules.end();
	for (QList<CSwordModuleInfo*>::const_iterator it(modules.begin()); it != end_it; ++it) {
		CSwordLexiconModuleInfo* lexicon = dynamic_cast<CSwordLexiconModuleInfo*>(*it);
		if (lexicon) {
			m_modules.append(lexicon);
		}
	}

	if (refresh) {
		refreshContent();
		//   adjustFont();
	}
}

/** No descriptions */
void CLexiconKeyChooser::updateKey(CSwordKey*) {}

void CLexiconKeyChooser::setKey(QString& newKey)
{
	m_key->key(newKey);
	setKey(m_key);
}