/****************************************************************************
**
** Copyright (C) 2012 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the Qt Commercial Charts Add-on.
**
** $QT_BEGIN_LICENSE$
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtGui/QApplication>
#include <QMainWindow>
#include <QChartView>
#include <QStackedBarSeries>
#include <QBarSet>
#include <QLegend>

QTCOMMERCIALCHART_USE_NAMESPACE

//! [1]
class DrilldownBarSeries : public QStackedBarSeries
{
    Q_OBJECT
public:
    DrilldownBarSeries(QStringList categories, QObject *parent = 0)
        :QStackedBarSeries(categories, parent)
    {

    }

    void mapDrilldownSeries(QString category, DrilldownBarSeries* drilldownSeries)
    {
        mDrilldownSeries[category] = drilldownSeries;
    }

    DrilldownBarSeries* drilldownSeries(QString category)
    {
        return mDrilldownSeries[category];
    }

private:
    QMap<QString, DrilldownBarSeries*> mDrilldownSeries;
};
//! [1]

//! [2]
class DrilldownChart : public QChart
{
    Q_OBJECT
public:
    explicit DrilldownChart(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0)
        :QChart(parent, wFlags),
        m_currentSeries(0)
    {

    }

    void changeSeries(QSeries* series)
    {
        if (m_currentSeries)
            removeSeries(m_currentSeries);
        m_currentSeries = series;
        addSeries(series);
        setTitle(series->name());
    }

public Q_SLOTS:
    void handleClicked(QBarSet *barset, QString category, Qt::MouseButtons button)
    {
        Q_UNUSED(barset)
        Q_UNUSED(button)
        DrilldownBarSeries* series = static_cast<DrilldownBarSeries*> (sender());
        changeSeries(series->drilldownSeries(category));
    }

private:
    QSeries* m_currentSeries;
};
//! [2]

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow window;

    DrilldownChart* drilldownChart =  new DrilldownChart();
    drilldownChart->setTheme(QChart::ChartThemeBlueIcy);
    drilldownChart->setAnimationOptions(QChart::SeriesAnimations);

    //! [3]
    // Define categories
    QStringList months;
    months << "May" << "Jun" << "Jul" << "Aug" << "Sep";
    QStringList weeks;
    weeks << "week 1" << "week 2" << "week 3" << "week 4";
    QStringList plants;
    plants << "Habanero" << "Lemon Drop" << "Starfish" << "Aji Amarillo";
    //! [3]

    //! [4]
    // Create drilldown structure
    DrilldownBarSeries* seasonSeries = new DrilldownBarSeries(months, drilldownChart);
    seasonSeries->setName("Crop by month - Season");

    // Each month in season series has drilldown series for weekly data
    foreach (QString month, months) {

        // Create drilldown series for every week
        DrilldownBarSeries* weeklySeries = new DrilldownBarSeries(weeks, drilldownChart);
        seasonSeries->mapDrilldownSeries(month, weeklySeries);

        // Drilling down from weekly data brings us back to season data.
        foreach (QString week, weeks) {
            weeklySeries->mapDrilldownSeries(week, seasonSeries);
            weeklySeries->setName(QString("Crop by week - " + month));
        }

        // Use right click signal to implement drilldown
        QObject::connect(weeklySeries, SIGNAL(clicked(QBarSet*,QString,Qt::MouseButtons)), drilldownChart, SLOT(handleClicked(QBarSet*,QString,Qt::MouseButtons)));
    }

    // Enable drilldown from season series using right click.
    QObject::connect(seasonSeries, SIGNAL(clicked(QBarSet*,QString,Qt::MouseButtons)), drilldownChart, SLOT(handleClicked(QBarSet*,QString,Qt::MouseButtons)));
    //! [4]

    //! [5]
    // Fill monthly and weekly series with data
    foreach (QString plant, plants) {
        QBarSet* monthlyCrop = new QBarSet(plant);
        foreach (QString month, months) {
            QBarSet* weeklyCrop = new QBarSet(plant);
            foreach (QString week, weeks )
                *weeklyCrop << (qrand() % 20);
            // Get the drilldown series from season series and add crop to it.
            seasonSeries->drilldownSeries(month)->appendBarSet(weeklyCrop);
            seasonSeries->drilldownSeries(month)->setToolTipEnabled(true);
            *monthlyCrop << weeklyCrop->total();
        }
        seasonSeries->appendBarSet(monthlyCrop);
    }
    //! [5]

    seasonSeries->setToolTipEnabled(true);

    //! [6]
    // Show season series in initial view
    drilldownChart->changeSeries(seasonSeries);
    drilldownChart->setTitle(seasonSeries->name());
    //! [6]

    drilldownChart->axisX()->setGridLineVisible(false);
    drilldownChart->legend()->setVisible(true);
    drilldownChart->legend()->setAlignmnent(QLegend::AlignmentBottom);

    QChartView *chartView = new QChartView(drilldownChart);
    window.setCentralWidget(chartView);
    window.resize(400, 300);
    window.show();

    return a.exec();
}

#include "main.moc"