/*
    kCalculator, a simple scientific calculator for KDE

    Copyright (C) 2003 Klaus Niederkrueger <kniederk@math.uni-koeln.de>

    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.

    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 Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/

#include "kcalc_const_menu.h"

#include <QDomDocument>
#include <QFile>
#include <kdebug.h>
#include <klocale.h>
#include <kstandarddirs.h>

QList<science_constant> KCalcConstMenu::Constants;


void KCalcConstMenu::init_consts()
{
    QDomDocument doc(QLatin1String( "list_of_constants" ));
    QFile file(KGlobal::dirs()->findResource("appdata", QLatin1String( "scienceconstants.xml" )));

    if (!file.open(QIODevice::ReadOnly)) {
        kDebug() << "Did not find file \"scienceconstants.xml\"." << "No constants will be available.";
        return;
    }
    if (!doc.setContent(&file)) {
        file.close();
        kDebug() << "The file \"scienceconstants.xml\" does not seem"
        "to be a valid description file. "
        "No constants will be available.";
        return;
    }
    file.close();

    // print out the element names of all elements that are direct children
    // of the outermost element.
    QDomElement docElem = doc.documentElement();

    int i = 0;
    QDomNode n = docElem.firstChild();
    while (!n.isNull()) {
        QDomElement e = n.toElement(); // try to convert the node to an element.
        if (!e.isNull()  &&  e.tagName() == QLatin1String( "constant" )) {
            science_constant tmp_const;

            tmp_const.name = I18N_NOOP(e.attributeNode(QLatin1String( "name" )).value());
            tmp_const.label = e.attributeNode(QLatin1String( "symbol" )).value();
            tmp_const.value = e.attributeNode(QLatin1String( "value" )).value();

            QString tmp_str_category = e.attributeNode(QLatin1String( "category" )).value();

            if (tmp_str_category == QLatin1String( "mathematics" ))
                tmp_const.category = Mathematics;
            if (tmp_str_category == QLatin1String( "electromagnetism" ))
                tmp_const.category = Electromagnetic;
            if (tmp_str_category == QLatin1String( "nuclear" ))
                tmp_const.category = Nuclear;
            if (tmp_str_category == QLatin1String( "thermodynamics" ))
                tmp_const.category = Thermodynamics;
            if (tmp_str_category == QLatin1String( "gravitation" ))
                tmp_const.category = Gravitation;

            tmp_const.whatsthis = e.firstChildElement(QLatin1String( "description" )).text();

            Constants.append(tmp_const);
        }
        n = n.nextSibling();
        i++;
    }
}

void KCalcConstMenu::init_all()
{
    QMenu *math_menu = addMenu(i18n("Mathematics"));
    QMenu *em_menu = addMenu(i18n("Electromagnetism"));
    QMenu *nuclear_menu = addMenu(i18n("Atomic && Nuclear"));
    QMenu *thermo_menu = addMenu(i18n("Thermodynamics"));
    QMenu *gravitation_menu = addMenu(i18n("Gravitation"));

    connect(this, SIGNAL(triggered(QAction *)), SLOT(slotPassSignalThrough(QAction *)));


    for (int i = 0; i < Constants.size(); i++) {
        QAction *tmp_action = new QAction(i18n(Constants.at(i).name.toAscii().data()), this);
        tmp_action->setData(QVariant(i));
        if (Constants.at(i).category  &  Mathematics)
            math_menu->addAction(tmp_action);
        if (Constants.at(i).category  &  Electromagnetic)
            em_menu->addAction(tmp_action);
        if (Constants.at(i).category  &  Nuclear)
            nuclear_menu->addAction(tmp_action);
        if (Constants.at(i).category  &  Thermodynamics)
            thermo_menu->addAction(tmp_action);
        if (Constants.at(i).category  &  Gravitation)
            gravitation_menu->addAction(tmp_action);
    }
}

void KCalcConstMenu::slotPassSignalThrough(QAction  *chosen_const)
{
    bool tmp_bool;
    int chosen_const_idx = (chosen_const->data()).toInt(& tmp_bool);
    emit triggeredConstant(Constants.at(chosen_const_idx));
}

KCalcConstMenu::KCalcConstMenu(const QString &title, QWidget * parent)
        : QMenu(title, parent)
{
    init_all();
}

KCalcConstMenu::KCalcConstMenu(QWidget * parent)
        : QMenu(parent)
{
    init_all();
}


#include "kcalc_const_menu.moc"
