//
// C++ Implementation: BTHistory
//
// Description: 
//
//
// Author: The BibleTime team <info@bibletime.info>, (C) 2007
//
// Copyright: See COPYING file that comes with this distribution
//
//

#include "bthistory.h"
#include "bthistory.moc"

#include "backend/keys/cswordkey.h"


#include <QAction>
#include <QList>

#include <QDebug>


BTHistory::BTHistory(QWidget* parent)
	: m_historyList(),
	m_index(-1),
	m_inHistoryFunction(false)
{
	setParent(parent);
	Q_ASSERT(class_invariant());
}

void BTHistory::add(CSwordKey* newKey) {
	qDebug("BTHistory::add");
	Q_ASSERT(newKey);
	// Add new key Action after current index if we were not using the history functions,
	// if it's not a duplicate and if it's not empty.
	if (!m_inHistoryFunction &&	((m_index < 0) || (newKey->key() != m_historyList.at(m_index)->text()) ))
	{
		if (!newKey->key().isEmpty()) {
			m_historyList.insert(++m_index, new QAction(newKey->key(), this));
		}
		// TODO: history limit?
		sendChangedSignal();
	}
	Q_ASSERT(class_invariant());
}

void BTHistory::move(QAction* historyItem)
{
	qDebug("BTHistory::move");
	//Q_ASSERT(historyItem);
	Q_ASSERT(m_historyList.count());

	m_inHistoryFunction = true;
	//find the action in the list
	m_index = m_historyList.indexOf(historyItem);
	//move to the selected item in the list, it will be the current item
	QString newKey = m_historyList.at(m_index)->text();
	emit historyMoved(newKey); // signal to "outsiders"; key has been changed
	sendChangedSignal();
	
	m_inHistoryFunction = false;
	Q_ASSERT(class_invariant());
}

void BTHistory::back()
{
	qDebug("BTHistory::back");
	if ( m_index >= 1) {
		move(m_historyList.at(m_index-1));
	}
	Q_ASSERT(class_invariant());
}

void BTHistory::fw()
{
	qDebug("BTHistory::fw");
	if (m_index < (m_historyList.size()-1)) {
		move(m_historyList.at(m_index+1));
	}
	Q_ASSERT(class_invariant());
}

QList<QAction*> BTHistory::getBackList()
{
	qDebug("BTHistory::getBackList");

	QList<QAction*> list;
	for (int i = m_index-1; i >= 0; --i) {
		list.append(m_historyList.at(i));
	}

	qDebug() << "return:" << list;
	Q_ASSERT(class_invariant());
	return list;
}

QList<QAction*> BTHistory::getFwList()
{
	qDebug("BTHistory::getFwList");
	
	QList<QAction*> list;
	//qDebug() << "historyList.size:" << m_historyList.size();
	for (int i = m_index+1; i < m_historyList.size(); ++i) {
		//qDebug() << "i:" << i;
		list.append(m_historyList.at(i));
	}
	qDebug() << "return:" << list;
	
	Q_ASSERT(class_invariant());
	return list;
}

void BTHistory::sendChangedSignal()
{
	bool backEnabled = m_index > 0; //there are items in the back list
	bool fwEnabled = m_historyList.size() > m_index+1; //there are items in the fw list
	emit historyChanged(backEnabled, fwEnabled);
	Q_ASSERT(class_invariant());
}

bool BTHistory::class_invariant()
{
	for (int i = 0; i < m_historyList.size(); ++i) {
		if (!m_historyList.at(i) || m_historyList.at(i)->text().isEmpty()) return false;
	}
	if (!(m_index >= -1 && m_index < m_historyList.size())) return false;
	return true;
}
