// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include "stackeddrilldownchart.h"
#include "stackeddrilldownseries.h"
#include "stackeddrilldownwidget.h"

#include <QBarSet>
#include <QChart>
#include <QRandomGenerator>

StackedDrilldownWidget::StackedDrilldownWidget(QWidget *parent)
    : ContentWidget(parent)
{
    //! [1]
    auto drilldownChart = new StackedDrilldownChart;
    drilldownChart->setAnimationOptions(QChart::SeriesAnimations);
    //! [1]

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

    //! [3]
    // Create drilldown structure
    auto seasonSeries = new StackedDrilldownSeries(months, 320, drilldownChart);
    seasonSeries->setName("Crop by month - Season (Click on bar to drill down)");

    // Each month in season series has drilldown series for weekly data
    for (int month = 0; month < months.count(); month++) {
        // Create drilldown series for every week
        auto weeklySeries = new StackedDrilldownSeries(weeks, 80, drilldownChart);
        seasonSeries->mapDrilldownSeries(month, weeklySeries);

        // Drilling down from weekly data brings us back to season data.
        for (int week = 0; week < weeks.count(); week++) {
            weeklySeries->mapDrilldownSeries(week, seasonSeries);
            weeklySeries->setName(QString("Crop by week - " + months.at(month)));
        }

        // Use clicked signal to implement drilldown
        QObject::connect(weeklySeries, &StackedDrilldownSeries::clicked,
                         drilldownChart, &StackedDrilldownChart::handleClicked);
    }

    // Enable drilldown from season series using clicked signal
    QObject::connect(seasonSeries, &StackedDrilldownSeries::clicked,
                     drilldownChart, &StackedDrilldownChart::handleClicked);
    //! [3]

    //! [4]
    // Fill monthly and weekly series with data
    for (const QString &plant : plants) {
        auto monthlyCrop = new QBarSet(plant);
        for (int month = 0; month < months.count(); month++) {
            auto weeklyCrop = new QBarSet(plant);
            for (int week = 0; week < weeks.count(); week++)
                *weeklyCrop << QRandomGenerator::global()->bounded(20);
            // Get the drilldown series from season series and add crop to it.
            seasonSeries->drilldownSeries(month)->append(weeklyCrop);
            *monthlyCrop << weeklyCrop->sum();
        }
        seasonSeries->append(monthlyCrop);
    }
    //! [4]

    //! [5]
    // Show season series in initial view
    drilldownChart->changeSeries(seasonSeries);
    drilldownChart->setTitle(seasonSeries->name());
    //! [5]

    //! [6]
    drilldownChart->axes(Qt::Horizontal).first()->setGridLineVisible(false);
    drilldownChart->legend()->setVisible(true);
    drilldownChart->legend()->setAlignment(Qt::AlignBottom);
    //! [6]

    //! [7]
    createDefaultChartView(drilldownChart);
    //! [7]
}
