/*
 * Copyright 2008-2009 Ben Boeckel <MathStuf@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, either version 3 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, see <http://www.gnu.org/licenses/>.
 */

// Header include
#include "FractionWidget.h"
#include "FractionWidget_p.h"

// KDE includes
#include <KIntNumInput>
#include <KLineEdit>

// Qt includes
#include <QtCore/QFile>
#include <QtGui/QVBoxLayout>
#include <QtUiTools/QUiLoader>

// C includes
#include <climits>

using namespace Sigcore;
using namespace Sigmodr::CoreWidgets;

FractionWidget::FractionWidget(QWidget* parent, const Fraction& value) :
        QWidget(parent),
        d(new Private(this, value))
{
    QVBoxLayout* layout = new QVBoxLayout;
    layout->addWidget(d->makeWidgets(this));
    setLayout(layout);
}

FractionWidget::Behavior FractionWidget::behavior() const
{
    return d->m_behavior;
}

Fraction FractionWidget::value() const
{
    return d->m_value;
}

void FractionWidget::setBehavior(const Behavior behavior)
{
    d->m_behavior = behavior;
    emit(behaviorChanged(d->m_behavior));
}

void FractionWidget::setValue(const Fraction& value)
{
    if (d->m_value == value)
        return;
    d->m_value = value;
    emit(valueChanged(d->m_value));
}

FractionWidget::Private::Private(QObject* parent, const Fraction& value) :
        QObject(parent),
        m_value(value),
        m_behavior(Any)
{
}

QWidget* FractionWidget::Private::makeWidgets(FractionWidget* widget)
{
    QFile file(":/gui/fraction.ui");
    file.open(QFile::ReadOnly);
    QWidget *formWidget = QUiLoader().load(&file, widget);
    file.close();
    ui_numerator = formWidget->findChild<KIntNumInput*>("varNumerator");
    ui_denominator = formWidget->findChild<KIntNumInput*>("varDenominator");
    ui_value = formWidget->findChild<KLineEdit*>("varValue");
    connect(ui_numerator, SIGNAL(valueChanged(int)), this, SLOT(numeratorChanged(int)));
    connect(ui_denominator, SIGNAL(valueChanged(int)), this, SLOT(denominatorChanged(int)));
    connect(this, SIGNAL(valueChanged(Sigcore::Fraction)), widget, SIGNAL(valueChanged(Sigcore::Fraction)));
    connect(widget, SIGNAL(valueChanged(Sigcore::Fraction)), this, SLOT(setGui()));
    connect(widget, SIGNAL(behaviorChanged(Behavior)), this, SLOT(resetRanges()));
    updateValue();
    return formWidget;
}

void FractionWidget::Private::numeratorChanged(const int numerator)
{
    m_value.setNumerator(numerator);
    emit(valueChanged(m_value));
}

void FractionWidget::Private::denominatorChanged(const int denominator)
{
    m_value.setDenominator(denominator);
    emit(valueChanged(m_value));
}

void FractionWidget::Private::setGui()
{
    resetRanges();
    ui_numerator->setValue(m_value.numerator());
    ui_denominator->setValue(m_value.denominator());
    updateValue();
}

void FractionWidget::Private::updateValue()
{
    ui_value->setText(QString::number(double(m_value), 'g', 7));
}

void FractionWidget::Private::resetRanges()
{
    int numMin = 0;
    int numMax = INT_MAX;
    int denomMin = 1;
    int denomMax = INT_MAX;
    switch (m_behavior)
    {
        case NonZero:
            numMin = 1;
        case Proper:
            numMax = m_value.denominator();
            break;
        case Improper:
            denomMax = m_value.numerator();
        case AnyButZero:
            numMin = 1;
        default:
            break;
    }
    ui_numerator->setRange(numMin, numMax);
    ui_denominator->setRange(denomMin, denomMax);
}