/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2006-2007 Igor Ulyanov <iulyanov@gmail.com>

 *

 * 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; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

/**

 * @file

 * @brief HistoryLineEdit class implementation

 */

#include <QStringList>

#include "HistoryLineEdit.h"

HistoryLineEdit::HistoryLineEdit(QWidget * parent, int maxHistorySize)

    : QLineEdit(parent)

{

    m_curHistEntryIdx = 0;

    m_maxHistorySize = maxHistorySize;

    m_history = new QStringList();

}

HistoryLineEdit::~HistoryLineEdit()

{

    delete m_history;

}

void HistoryLineEdit::rememberCurrentText()

{

    QString newEntry = text();

    // don't store whitespace-only/empty text

    if (newEntry.trimmed().isEmpty())

        return;

    m_history->removeOne(newEntry); // no duplicates please

    m_history->append(newEntry);

    // do not keep more entries than allowed

    if (m_history->size() > m_maxHistorySize)

        m_history->removeFirst();

    // we're looking at the latest entry

    m_curHistEntryIdx = m_history->size() - 1;

}

void HistoryLineEdit::clear()

{

    QLineEdit::clear();

    m_curHistEntryIdx = m_history->size();

}

void HistoryLineEdit::reset()

{

    // forget history

    m_history->clear();

    m_curHistEntryIdx = 0;

}

void HistoryLineEdit::navigateHistory(bool isGoingUp)

{

    // save possible changes to new entry

    if ((m_curHistEntryIdx >= m_history->size() ||

            (text() != m_history->at(m_curHistEntryIdx))))

    {

        rememberCurrentText();

    }

    if (isGoingUp)

        m_curHistEntryIdx--;

    else

        m_curHistEntryIdx++;

    // if Idx higher than valid range

    if (m_curHistEntryIdx >= m_history->size())

    {

        QLineEdit::clear();

        m_curHistEntryIdx = m_history->size();

    }

    // if Idx in valid range

    else if (m_curHistEntryIdx >= 0)

    {

        setText(m_history->at(m_curHistEntryIdx));

    }

    // if Idx below 0

    else

        m_curHistEntryIdx = 0;

}

void HistoryLineEdit::keyPressEvent(QKeyEvent * event)

{

    int key = event->key(); // retrieve pressed key

    // navigate history with arrow keys

    if (event->modifiers() == Qt::NoModifier)

        switch (key)

        {

            case Qt::Key_Escape:

                clear();

                event->accept();

                break;

            case Qt::Key_Up:

                navigateHistory(true);

                event->accept();

                break;

            case Qt::Key_Down:

                navigateHistory(false);

                event->accept();

                break;

            default:

                QLineEdit::keyPressEvent(event);

                break;

        }

    // otherwise forward keys to parent

    else

        QLineEdit::keyPressEvent(event);

}