/*
    SPDX-FileCopyrightText: 2005 Ace Jones <acejones@users.sourceforge.net>
    SPDX-FileCopyrightText: 2005-2018 Thomas Baumgart <tbaumgart@kde.org>
    SPDX-FileCopyrightText: 2017-2018 Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com>
    SPDX-FileCopyrightText: 2018 Michael Kiefer <mlkiefer@users.noreply.github.com>
    SPDX-FileCopyrightText: 2020 Robert Szczesiak <dev.rszczesiak@gmail.com>
    SPDX-License-Identifier: GPL-2.0-or-later
*/

#include "kreportchartview.h"

// ----------------------------------------------------------------------------
// QT Includes
#include <QStandardItemModel>
#include <QFontDatabase>
#include <QtMath>

// ----------------------------------------------------------------------------
// KDE Includes
#include <KColorScheme>
#include <KLocalizedString>

// ----------------------------------------------------------------------------
// Project Includes
#include <KChartBackgroundAttributes>
#include <KChartDataValueAttributes>
#include <KChartMarkerAttributes>
#include <KChartGridAttributes>
#include <KChartHeaderFooter>
#include <KChartLegend>
#include <KChartLineDiagram>
#include <KChartBarDiagram>
#include <KChartPieDiagram>
#include <KChartRingDiagram>
#include <KChartCartesianAxis>
#include <KChartFrameAttributes>
#include "kmymoneysettings.h"
#include "kreportcartesianaxis.h"
#include "mymoneyfile.h"
#include "mymoneysecurity.h"
#include "mymoneyenums.h"

using namespace reports;

KReportChartView::KReportChartView(QWidget* parent) :
    KChart::Chart(parent),
    m_accountSeries(0),
    m_seriesTotals(0),
    m_numColumns(0),
    m_skipZero(0),
    m_backgroundBrush(KColorScheme(QPalette::Current).background()),
    m_foregroundBrush(KColorScheme(QPalette::Current).foreground()),
    m_precision(2)
{
    // ********************************************************************
    // Set KMyMoney's Chart Parameter Defaults
    // ********************************************************************

    //Set the background obtained from the color scheme
    BackgroundAttributes backAttr(backgroundAttributes());
    backAttr.setBrush(m_backgroundBrush);
    backAttr.setVisible(true);
    setBackgroundAttributes(backAttr);
}

void KReportChartView::drawPivotChart(const PivotGrid &grid, const MyMoneyReport &config, int numberColumns, const QStringList& columnHeadings, const QList<ERowType>& rowTypeList, const QStringList& columnTypeHeaderList)
{
    if (numberColumns == 0)
        return;
    //set the number of columns
    setNumColumns(numberColumns);

    //set skipZero
    m_skipZero = config.isSkippingZero();

    //remove existing headers
    const HeaderFooterList hfList = headerFooters();
    foreach (const auto hf, hfList)
        delete hf;

    //remove existing legends
    const LegendList lgList = legends();
    foreach (const auto lg, lgList)
        delete lg;

    //make sure the model is clear
    m_model.clear();
    const bool blocked = m_model.blockSignals(true); // don't emit dataChanged() signal during each drawPivotRowSet

    //set the new header
    HeaderFooter* header = new HeaderFooter;
    // adding some extra spaces at the end here avoids truncation
    // of the label on the diagram and solves bug #399260
    header->setText(config.name().append(QLatin1String("     ")));
    header->setType(HeaderFooter::Header);
    header->setPosition(Position::North);
    TextAttributes headerTextAttr(header->textAttributes());
    headerTextAttr.setPen(m_foregroundBrush.color());
    header->setTextAttributes(headerTextAttr);
    addHeaderFooter(header);

    // whether to limit the chart to use series totals only.  Used for reports which only
    // show one dimension (pie).
    setSeriesTotals(false);

    // whether series (rows) are accounts (true) or months (false). This causes a lot
    // of complexity in the charts.  The problem is that circular reports work best with
    // an account in a COLUMN, while line/bar prefer it in a ROW.
    setAccountSeries(true);

    switch (config.chartType()) {
    case eMyMoney::Report::ChartType::Line:
    case eMyMoney::Report::ChartType::Bar:
    case eMyMoney::Report::ChartType::StackedBar: {
        CartesianCoordinatePlane* cartesianPlane = new CartesianCoordinatePlane(this);
        cartesianPlane->setAutoAdjustVerticalRangeToData(2);
        cartesianPlane->setRubberBandZoomingEnabled(true);
        replaceCoordinatePlane(cartesianPlane);

        // set-up axis type
        if (config.isLogYAxis())
            cartesianPlane->setAxesCalcModeY(KChart::AbstractCoordinatePlane::Logarithmic);
        else
            cartesianPlane->setAxesCalcModeY(KChart::AbstractCoordinatePlane::Linear);

        QLocale loc = locale();
        // set-up grid
        GridAttributes ga = cartesianPlane->gridAttributes(Qt::Vertical);
        ga.setGridVisible(config.isChartCHGridLines());
        ga.setGridStepWidth(config.isDataUserDefined() ? loc.toDouble(config.dataMajorTick()) : 0.0);
        ga.setGridSubStepWidth(config.isDataUserDefined() ? loc.toDouble(config.dataMinorTick()) : 0.0);
        cartesianPlane->setGridAttributes(Qt::Vertical, ga);

        ga = cartesianPlane->gridAttributes(Qt::Horizontal);
        ga.setGridVisible(config.isChartSVGridLines());
        cartesianPlane->setGridAttributes(Qt::Horizontal, ga);

        // set-up data range
        cartesianPlane->setVerticalRange(qMakePair(config.isDataUserDefined() ? loc.toDouble(config.dataRangeStart()) : 0.0,
                                         config.isDataUserDefined() ? loc.toDouble(config.dataRangeEnd()) : 0.0));

        //set-up x axis
        CartesianAxis *xAxis = new CartesianAxis();
        xAxis->setPosition(CartesianAxis::Bottom);
        xAxis->setTitleText(i18n("Time"));
        TextAttributes xAxisTitleTextAttr(xAxis->titleTextAttributes());
        xAxisTitleTextAttr.setMinimalFontSize(QFontDatabase::systemFont(QFontDatabase::GeneralFont).pointSize());
        xAxisTitleTextAttr.setPen(m_foregroundBrush.color());
        xAxis->setTitleTextAttributes(xAxisTitleTextAttr);
        TextAttributes xAxisTextAttr(xAxis->textAttributes());
        xAxisTextAttr.setPen(m_foregroundBrush.color());
        xAxis->setTextAttributes(xAxisTextAttr);
        RulerAttributes xAxisRulerAttr(xAxis->rulerAttributes());
        xAxisRulerAttr.setTickMarkPen(m_foregroundBrush.color());
        xAxisRulerAttr.setShowRulerLine(true);
        xAxis->setRulerAttributes(xAxisRulerAttr);

        //set-up y axis
        KReportCartesianAxis *yAxis = new KReportCartesianAxis(loc, config.yLabelsPrecision());
        yAxis->setPosition(CartesianAxis::Left);

        if (config.isIncludingPrice())
            yAxis->setTitleText(i18n("Price"));
        else
            yAxis->setTitleText(i18n("Balance"));

        TextAttributes yAxisTitleTextAttr(yAxis->titleTextAttributes());
        yAxisTitleTextAttr.setMinimalFontSize(QFontDatabase::systemFont(QFontDatabase::GeneralFont).pointSize());
        yAxisTitleTextAttr.setPen(m_foregroundBrush.color());
        yAxis->setTitleTextAttributes(yAxisTitleTextAttr);
        TextAttributes yAxisTextAttr(yAxis->textAttributes());
        yAxisTextAttr.setPen(m_foregroundBrush.color());
        yAxis->setTextAttributes(yAxisTextAttr);
        RulerAttributes yAxisRulerAttr(yAxis->rulerAttributes());
        yAxisRulerAttr.setTickMarkPen(m_foregroundBrush.color());
        yAxisRulerAttr.setShowRulerLine(true);
        yAxis->setRulerAttributes(yAxisRulerAttr);

        switch (config.chartType()) {
        case eMyMoney::Report::ChartType::End:
        case eMyMoney::Report::ChartType::Line: {
            KChart::LineDiagram* diagram = new KChart::LineDiagram(this, cartesianPlane);

            if (config.isSkippingZero()) {
                LineAttributes attributes = diagram->lineAttributes();
                attributes.setMissingValuesPolicy(LineAttributes::MissingValuesAreBridged);
                diagram->setLineAttributes(attributes);
            }
            cartesianPlane->replaceDiagram(diagram);
            diagram->addAxis(xAxis);
            diagram->addAxis(yAxis);
            break;
        }
        case eMyMoney::Report::ChartType::Bar: {
            KChart::BarDiagram* diagram = new KChart::BarDiagram(this, cartesianPlane);
            cartesianPlane->replaceDiagram(diagram);
            diagram->addAxis(xAxis);
            diagram->addAxis(yAxis);
            break;
        }
        case eMyMoney::Report::ChartType::StackedBar: {
            KChart::BarDiagram* diagram = new KChart::BarDiagram(this, cartesianPlane);
            diagram->setType(BarDiagram::Stacked);
            cartesianPlane->replaceDiagram(diagram);
            diagram->addAxis(xAxis);
            diagram->addAxis(yAxis);
            break;
        }
        default:
            break;
        }
        break;
    }
    case eMyMoney::Report::ChartType::Pie:
    case eMyMoney::Report::ChartType::Ring: {
        PolarCoordinatePlane* polarPlane = new PolarCoordinatePlane(this);
        replaceCoordinatePlane(polarPlane);

        // set-up grid
        GridAttributes ga = polarPlane->gridAttributes(true);
        ga.setGridVisible(config.isChartCHGridLines());
        polarPlane->setGridAttributes(true, ga);

        ga = polarPlane->gridAttributes(false);
        ga.setGridVisible(config.isChartSVGridLines());
        polarPlane->setGridAttributes(false, ga);

        setAccountSeries(false);

        switch (config.chartType()) {
        case eMyMoney::Report::ChartType::Pie: {
            KChart::PieDiagram* diagram = new KChart::PieDiagram(this, polarPlane);
            polarPlane->replaceDiagram(diagram);
            setSeriesTotals(true);
            break;
        }
        case eMyMoney::Report::ChartType::Ring: {
            KChart::RingDiagram* diagram = new KChart::RingDiagram(this, polarPlane);
            polarPlane->replaceDiagram(diagram);
            break;
        }
        default:
            break;
        }

        break;
    }
    default:  // no valid chart types
        return;
    }
    //get the coordinate plane  and the diagram for later use
    AbstractCoordinatePlane* cPlane = coordinatePlane();
    AbstractDiagram* planeDiagram = cPlane->diagram();
    planeDiagram->setAntiAliasing(true);

    // setup chart color palette
    switch (config.chartPalette()) {
    case eMyMoney::Report::ChartPalette::Application:
        switch (KMyMoneySettings::chartsPalette()) {
        case 0:
            planeDiagram->useDefaultColors();
            break;
        case 1:
            planeDiagram->useRainbowColors();
            break;
        case 2:
        default:
            planeDiagram->useSubduedColors();
            break;
        }
        break;
    case eMyMoney::Report::ChartPalette::Default:
        planeDiagram->useDefaultColors();
        break;
    case eMyMoney::Report::ChartPalette::Rainbow:
        planeDiagram->useRainbowColors();
        break;
    default:
    case eMyMoney::Report::ChartPalette::Subdued:
        planeDiagram->useSubduedColors();
        break;
    }

    int eBudgetDiffIdx = rowTypeList.indexOf(eBudgetDiff);
    QList<ERowType> myRowTypeList = rowTypeList;
    myRowTypeList.removeAt(eBudgetDiffIdx);
    QStringList myColumnTypeHeaderList = columnTypeHeaderList;
    myColumnTypeHeaderList.removeAt(eBudgetDiffIdx);
    int myRowTypeListSize = myRowTypeList.size();
    MyMoneyFile* file = MyMoneyFile::instance();
    int precision = MyMoneyMoney::denomToPrec(file->baseCurrency().smallestAccountFraction());
    int rowNum = 0;
    QStringList legendNames;
    QMap<MyMoneyMoney, int> legendTotal;

    switch (config.detailLevel()) {
    case eMyMoney::Report::DetailLevel::None:
    case eMyMoney::Report::DetailLevel::All: {
        // iterate over outer groups
        PivotGrid::const_iterator it_outergroup = grid.begin();
        while (it_outergroup != grid.end()) {
            //determine whether expenses should be displayed as negative
            const bool invertValue = (config.isNegExpenses() && (*it_outergroup).m_inverted);
            // iterate over inner groups
            PivotOuterGroup::const_iterator it_innergroup = (*it_outergroup).begin();
            while (it_innergroup != (*it_outergroup).end()) {
                // iterate over accounts
                PivotInnerGroup::const_iterator it_row = (*it_innergroup).begin();
                while (it_row != (*it_innergroup).end()) {
                    //Do not include investments accounts in the chart because they are merely container of stock and other accounts
                    if (it_row.key().accountType() != eMyMoney::Account::Type::Investment) {

                        // get displayed precision
                        int currencyPrecision = precision;
                        int securityPrecision = precision;
                        if (!it_row.key().id().isEmpty()) {
                            const MyMoneyAccount acc = file->account(it_row.key().id());
                            if (acc.isInvest()) {
                                securityPrecision = file->currency(acc.currencyId()).pricePrecision();
                                // stock account isn't evaluated in currency, so take investment account instead
                                currencyPrecision = MyMoneyMoney::denomToPrec(file->account(acc.parentAccountId()).fraction());
                            } else
                                currencyPrecision = MyMoneyMoney::denomToPrec(acc.fraction());
                        }

                        // iterate row types
                        for (int i = 0 ; i < myRowTypeListSize; ++i) {
                            QString legendText;

                            //only show the column type in the header if there is more than one type
                            if (myRowTypeListSize > 1)
                                legendText = QString(myColumnTypeHeaderList.at(i) + QLatin1Literal(" - ") + it_row.key().name());
                            else
                                legendText = it_row.key().name();

                            //set the legend text
                            legendNames.append(legendText);
                            legendTotal.insertMulti(it_row.value().value(myRowTypeList.at(i)).m_total.abs(), rowNum);

                            precision = myRowTypeList.at(i) == ePrice ? securityPrecision : currencyPrecision;

                            //set the cell value and tooltip
                            rowNum = drawPivotGridRow(rowNum, it_row.value().value(myRowTypeList.at(i)),
                                                      config.isChartDataLabels() ? legendText : QString(),
                                                      0, numberColumns, precision, invertValue);
                        }
                    }
                    ++it_row;
                }
                ++it_innergroup;
            }
            ++it_outergroup;
        }
    }
    break;

    case eMyMoney::Report::DetailLevel::Top: {
        // iterate over outer groups
        PivotGrid::const_iterator it_outergroup = grid.begin();
        while (it_outergroup != grid.end()) {
            //determine whether expenses should be displayed as negative
            const bool invertValue = (config.isNegExpenses() && (*it_outergroup).m_inverted);
            // iterate over inner groups
            PivotOuterGroup::const_iterator it_innergroup = (*it_outergroup).begin();
            while (it_innergroup != (*it_outergroup).end()) {
                // iterate row types
                for (int i = 0 ; i < myRowTypeListSize; ++i) {
                    QString legendText;

                    //only show the column type in the header if there is more than one type
                    if (myRowTypeListSize > 1)
                        legendText = QString(myColumnTypeHeaderList.at(i) + QLatin1Literal(" - ") + it_innergroup.key());
                    else
                        legendText = it_innergroup.key();

                    //set the legend text
                    legendNames.append(legendText);
                    legendTotal.insertMulti((*it_innergroup).m_total.value(myRowTypeList.at(i)).m_total.abs(), rowNum);

                    //set the cell value and tooltip
                    rowNum = drawPivotGridRow(rowNum, (*it_innergroup).m_total.value(myRowTypeList.at(i)),
                                              config.isChartDataLabels() ? legendText : QString(),
                                              0, numberColumns, precision, invertValue);
                }
                ++it_innergroup;
            }
            ++it_outergroup;
        }
    }
    break;

    case eMyMoney::Report::DetailLevel::Group: {
        // iterate over outer groups
        PivotGrid::const_iterator it_outergroup = grid.begin();
        while (it_outergroup != grid.end()) {
            //determine whether expenses should be displayed as negative
            const bool invertValue = (config.isNegExpenses() && (*it_outergroup).m_inverted);
            // iterate row types
            for (int i = 0 ; i < myRowTypeListSize; ++i) {
                QString legendText;

                //only show the column type in the header if there is more than one type
                if (myRowTypeListSize > 1)
                    legendText = QString(myColumnTypeHeaderList.at(i) + QLatin1Literal(" - ") + it_outergroup.key());
                else
                    legendText = it_outergroup.key();

                //set the legend text
                legendNames.append(legendText);
                legendTotal.insertMulti((*it_outergroup).m_total.value(myRowTypeList.at(i)).m_total.abs(), rowNum);

                //set the cell value and tooltip
                rowNum = drawPivotGridRow(rowNum, (*it_outergroup).m_total.value(myRowTypeList.at(i)),
                                          config.isChartDataLabels() ? legendText : QString(),
                                          0, numberColumns, precision, invertValue);
            }
            ++it_outergroup;
        }

        //if selected, show totals too
        if (config.isShowingRowTotals()) {
            // iterate row types
            for (int i = 0 ; i < myRowTypeListSize; ++i) {
                QString legendText;

                //only show the column type in the header if there is more than one type
                if (myRowTypeListSize > 1)
                    legendText = QString(myColumnTypeHeaderList.at(i) + QLatin1Literal(" - ") + i18nc("Total balance", "Total"));
                else
                    legendText = QString(i18nc("Total balance", "Total"));

                //set the legend text
                legendNames.append(legendText);
                legendTotal.insertMulti(grid.m_total.value(myRowTypeList.at(i)).m_total.abs(), rowNum);

                //set the cell value and tooltip
                rowNum = drawPivotGridRow(rowNum, grid.m_total.value(myRowTypeList.at(i)),
                                          config.isChartDataLabels() ? legendText : QString(),
                                          0, numberColumns, precision, false);
            }
        }
    }
    break;

    case eMyMoney::Report::DetailLevel::Total: {
        // iterate row types
        for (int i = 0 ; i < myRowTypeListSize; ++i) {
            QString legendText;

            //only show the column type in the header if there is more than one type
            if (myRowTypeListSize > 1)
                legendText = QString(myColumnTypeHeaderList.at(i) + QLatin1Literal(" - ") + i18nc("Total balance", "Total"));
            else
                legendText = QString(i18nc("Total balance", "Total"));

            //set the legend text
            legendNames.append(legendText);
            legendTotal.insertMulti(grid.m_total.value(myRowTypeList.at(i)).m_total.abs(), rowNum);

            //set the cell value and tooltip
            if (config.isMixedTime()) {
                if (myRowTypeList.at(i) == eActual)
                    rowNum = drawPivotGridRow(rowNum, grid.m_total.value(myRowTypeList.at(i)),
                                              config.isChartDataLabels() ? legendText : QString(),
                                              0, config.currentDateColumn(), precision, false);
                else if (myRowTypeList.at(i)== eForecast) {
                    rowNum = drawPivotGridRow(rowNum, grid.m_total.value(myRowTypeList.at(i)),
                                              config.isChartDataLabels() ? legendText : QString(),
                                              config.currentDateColumn(), numberColumns - config.currentDateColumn(), precision, false);

                } else
                    rowNum = drawPivotGridRow(rowNum, grid.m_total.value(myRowTypeList.at(i)),
                                              config.isChartDataLabels() ? legendText : QString(),
                                              0, numberColumns, precision, false);
            } else
                rowNum = drawPivotGridRow(rowNum, grid.m_total.value(myRowTypeList.at(i)),
                                          config.isChartDataLabels() ? legendText : QString(),
                                          0, numberColumns, precision, false);
        }

    }
    break;
    default:
    case eMyMoney::Report::DetailLevel::End:
        return;
    }

    auto legendRows = legendTotal.values();                     // list of legend rows sorted ascending by total value
    for (auto i = 0; i < legendRows.count(); ++i) {
        const auto ixRow = legendRows.count() - 1 - i;            // take row with the highest total value i.e. form the bottom
        const auto row = legendRows.at(ixRow);
        if ( row != i) {                                          // if legend isn't sorted by total value, then rearrange model
            if ((accountSeries() && !seriesTotals()) ||
                    (seriesTotals() && !accountSeries()))
                m_model.insertColumn(i, m_model.takeColumn(row));
            else
                m_model.insertRow(i, m_model.takeRow(row));

            for (auto j = i; j < ixRow; ++j) {                      // fix invalid indexes after above move operation
                if (legendRows.at(j) < row)
                    ++legendRows[j];
            }
            legendRows[ixRow] = i;
            legendNames.move(row, i);
        }
    }

    // Set up X axis labels (ie "abscissa" to use the technical term)
    if (accountSeries()) { // if not, we will set these up while putting in the chart values.
        QStringList xLabels;
        foreach (const auto colHeading, columnHeadings)
            xLabels.append(QString(colHeading).replace(QLatin1String("&nbsp;"), QLatin1String(" ")));
        m_model.setVerticalHeaderLabels(xLabels);
    }
    m_model.setHorizontalHeaderLabels(legendNames);

    // set line width for line chart
    if (config.chartType() == eMyMoney::Report::ChartType::Line) {
        AttributesModel* diagramAttributes = planeDiagram->attributesModel();
        int penWidth = config.chartLineWidth();
        for (int i = 0 ; i < rowNum ; ++i) {
            QPen pen = diagramAttributes->headerData(i, Qt::Horizontal, DatasetPenRole).value< QPen >();
            pen.setWidth(penWidth);
            m_model.setHeaderData(i, Qt::Horizontal, qVariantFromValue(pen), DatasetPenRole);
        }
    }

    // set the text attributes after calling replaceLegend() otherwise fon sizes will get overwritten
    qreal generalFontSize = QFontDatabase::systemFont(QFontDatabase::GeneralFont).pointSizeF();
    if (generalFontSize == -1)
        generalFontSize = 8; // this is a fallback if the fontsize was specified in pixels

    // the legend is needed only if at least two data sets are rendered
    if (qMin(static_cast<int>(KMyMoneySettings::maximumLegendItems()), rowNum) > 1) {
        //the legend will be used later
        Legend* legend = new Legend(planeDiagram, this);
        legend->setTitleText(i18nc("Chart legend title", "Legend"));

        //set the legend basic attributes
        //this is done after adding the legend because the values are overridden when adding the legend to the chart
        const auto maxLegendItems = KMyMoneySettings::maximumLegendItems();
        auto legendItems = legendNames.count();

        auto i = 0;
        while (legendItems > maxLegendItems) {
            legend->setDatasetHidden(legendRows.at(i++), true);
            --legendItems;
        }

        legend->setUseAutomaticMarkerSize(false);
        FrameAttributes legendFrameAttr(legend->frameAttributes());
        legendFrameAttr.setPen(m_foregroundBrush.color());
        // leave some space between the content and the frame
        legendFrameAttr.setPadding(2);
        legend->setFrameAttributes(legendFrameAttr);
        legend->setPosition(Position::East);
        legend->setTextAlignment(Qt::AlignLeft);
        if (config.isChartDataLabels())
            legend->setLegendStyle(KChart::Legend::MarkersAndLines);
        else
            legend->setLegendStyle(KChart::Legend::LinesOnly);
        replaceLegend(legend);

        TextAttributes legendTextAttr(legend->textAttributes());
        legendTextAttr.setPen(m_foregroundBrush.color());
        legendTextAttr.setFontSize(KChart::Measure(generalFontSize, KChartEnums::MeasureCalculationModeAbsolute));
        legend->setTextAttributes(legendTextAttr);

        TextAttributes legendTitleTextAttr(legend->titleTextAttributes());
        legendTitleTextAttr.setPen(m_foregroundBrush.color());
        legendTitleTextAttr.setFontSize(KChart::Measure(generalFontSize + 4, KChartEnums::MeasureCalculationModeAbsolute));
        legend->setTitleTextAttributes(legendTitleTextAttr);
    }

    //set data value attributes
    //make sure to show only the required number of fractional digits on the labels of the graph
    DataValueAttributes dataValueAttr(planeDiagram->dataValueAttributes());
    MarkerAttributes markerAttr(dataValueAttr.markerAttributes());
    markerAttr.setVisible(true);
    markerAttr.setMarkerStyle(MarkerAttributes::MarkerCircle);
    dataValueAttr.setMarkerAttributes(markerAttr);
    TextAttributes dataValueTextAttr(dataValueAttr.textAttributes());
    dataValueTextAttr.setPen(m_foregroundBrush.color());
    dataValueTextAttr.setFontSize(KChart::Measure(generalFontSize, KChartEnums::MeasureCalculationModeAbsolute));
    dataValueAttr.setTextAttributes(dataValueTextAttr);
    m_precision = config.yLabelsPrecision();
    dataValueAttr.setDecimalDigits(config.yLabelsPrecision());
    dataValueAttr.setVisible(config.isChartDataLabels());
    planeDiagram->setDataValueAttributes(dataValueAttr);
    planeDiagram->setAllowOverlappingDataValueTexts(false);

    m_model.blockSignals(blocked); // reenable dataChanged() signal

    //assign model to the diagram
    planeDiagram->setModel(&m_model);

    // use MyMoney::formatMoney to format the values
    const auto rows = m_model.rowCount();
    const auto cols = m_model.columnCount();
    for (int col = 0; col < cols; ++col) {
        for (int row = 0; row < rows; ++row) {
            const auto idx = m_model.index(row, 0);
            auto attrs = planeDiagram->dataValueAttributes(idx);
            const MyMoneyMoney value(idx.data(Qt::DisplayRole).toDouble());
            attrs.setDataLabel(value.formatMoney(QString(), m_precision));
            planeDiagram->setDataValueAttributes(idx, attrs);
        }
    }
    adjustVerticalRange(config.yLabelsPrecision());
}

void KReportChartView::adjustVerticalRange(const int precision)
{
    KChart::CartesianCoordinatePlane* cartesianPlane = qobject_cast<CartesianCoordinatePlane*>(coordinatePlane());
    if (!cartesianPlane)
        return; // only Cartesian planes are supported

    const qreal gridStart = cartesianPlane->gridDimensionsList().at(1).start;
    const qreal gridEnd = cartesianPlane->gridDimensionsList().at(1).end;
    const qreal precisionLimit = qPow(10, -precision);
    qreal dataRangeStart = cartesianPlane->verticalRange().first;
    qreal dataRangeEnd = cartesianPlane->verticalRange().second;

    bool dataRangeStartAdjusted = false;
    bool dataRangeEndAdjusted = false;

    if (cartesianPlane->axesCalcModeY() == KChart::AbstractCoordinatePlane::Logarithmic) {
        if (dataRangeStart == dataRangeEnd) {
            // if data model is represented by a horizontal line,
            // extend vertical range by two orders of magnitude upwards and downwards
            // if the whole data range is equal to zero,
            // at least draw an empty chart with four orders of magnitude on the vertical exis
            dataRangeStart = dataRangeStart > 0 ? qPow(10, qFloor(log10(dataRangeStart)) - 2) : precisionLimit;
            dataRangeEnd = dataRangeEnd > 0 ? qPow(10, qCeil(log10(dataRangeEnd)) + 2) : qPow(10, -precision + 4);
            dataRangeStartAdjusted = true;
            dataRangeEndAdjusted = true;
        }

        if (dataRangeStart < precisionLimit) {
            // if data range starts below the precision limit,
            // crop the chart to the precision limit
            dataRangeStart = precisionLimit;
            dataRangeStartAdjusted = true;
        }
        if (dataRangeEnd < precisionLimit) {
            // if data range ends below the precision limit,
            // at least draw an empty chart with four orders of magnitude on the vertical axis
            dataRangeEnd = qPow(10, -precision + 4);
            dataRangeEndAdjusted = true;
        }

        // if data range boundary needed no adjustment,
        // make sure it matches the original grid boundary
        if (!dataRangeStartAdjusted)
            dataRangeStart = gridStart;
        if (!dataRangeEndAdjusted)
            dataRangeEnd = gridEnd;
        cartesianPlane->setVerticalRange(qMakePair(dataRangeStart, dataRangeEnd));
    } else if (dataRangeStart == dataRangeEnd) // vertical axis type must be Linear then
        // if data model is represented by a horizontal line,
        // extend vertical range by two upwards and downwards
        cartesianPlane->setVerticalRange(qMakePair(dataRangeStart - 2, dataRangeEnd + 2));
}

int reports::KReportChartView::drawPivotGridRow ( int rowNum, const reports::PivotGridRow& gridRow, const QString& legendText, const int startColumn, const int columnsToDraw, const int precision, const bool invertValue )
{
    // Columns
    const QString toolTip = QStringLiteral("<h2>%1</h2><strong>%2</strong><br>");
    const bool isToolTip = !legendText.isEmpty();
    if (seriesTotals()) {
        QStandardItem* item = new QStandardItem();
        double value = gridRow.m_total.toDouble();
        item->setData(QVariant(value), Qt::DisplayRole);
        if (isToolTip) {
            const MyMoneyMoney monetaryValue(value);
            item->setToolTip(toolTip.arg(legendText, monetaryValue.formatMoney(QString(), precision)));
        }
        //set the cell value
        if (accountSeries()) {
            m_model.insertRows(rowNum, 1);
            m_model.setItem(rowNum, 0, item);
        } else {
            m_model.insertColumns(rowNum, 1);
            m_model.setItem(0, rowNum, item);
        }

    } else {
        QList<QStandardItem*> itemList;
        for (int i = 0; i < startColumn-1; ++i) {
            itemList.append(new QStandardItem);
        }
        for (int i = startColumn; i < startColumn + columnsToDraw; ++i) {
            QStandardItem* item = new QStandardItem();
            if (!m_skipZero || !gridRow.at(i).isZero()) {
                double value = gridRow.at(i).toDouble();
                if (invertValue)
                    value = -value;
                item->setData(QVariant(value), Qt::DisplayRole);
                if (isToolTip) {
                    const MyMoneyMoney monetaryValue(value);
                    item->setToolTip(toolTip.arg(legendText, monetaryValue.formatMoney(QString(), precision)));
                }
            }
            itemList.append(item);
        }
        if (accountSeries())
            m_model.appendColumn(itemList);
        else
            m_model.appendRow(itemList);
    }
    return ++rowNum;
}

void KReportChartView::setDataCell(int row, int column, const double value, QString tip)
{
    QMap<int, QVariant> cellMap;
    cellMap.insert(Qt::DisplayRole, QVariant(value));
    if (!tip.isEmpty())
        cellMap.insert(Qt::ToolTipRole, QVariant(tip));
    const QModelIndex index = m_model.index(row, column);
    m_model.setItemData(index, cellMap);
}

/**
 * Justifies the model, so that the given rows and columns fit into it.
 */
void KReportChartView::justifyModelSize(int rows, int columns)
{
    const int currentRows = m_model.rowCount();
    const int currentCols = m_model.columnCount();

    if (currentCols < columns)
        if (! m_model.insertColumns(currentCols, columns - currentCols))
            qDebug() << "justifyModelSize: could not increase model size.";
    if (currentRows < rows)
        if (! m_model.insertRows(currentRows, rows - currentRows))
            qDebug() << "justifyModelSize: could not increase model size.";

    Q_ASSERT(m_model.rowCount() >= rows);
    Q_ASSERT(m_model.columnCount() >= columns);
}

void KReportChartView::setLineWidth(const int lineWidth)
{
    LineDiagram* lineDiagram = qobject_cast<LineDiagram*>(coordinatePlane()->diagram());
    if (lineDiagram) {
        QList <QPen> pens;
        pens = lineDiagram->datasetPens();
        for (int i = 0; i < pens.count(); ++i) {
            pens[i].setWidth(lineWidth);
            lineDiagram->setPen(i, pens.at(i));
        }
    }
}

void KReportChartView::drawLimitLine(const double limit)
{
    if (coordinatePlane()->diagram()->datasetDimension() != 1)
        return;
    // temporarily disconnect the view from the model to aovid update of view on
    // emission of the dataChanged() signal for each call of setDataCell().
    // This speeds up the runtime of drawLimitLine() by a factor of
    // approx. 60 on my box (1831ms vs. 31ms).
    AbstractDiagram* planeDiagram = coordinatePlane()->diagram();
    planeDiagram->setModel(0);

    //we get the current number of rows and we add one after that
    int row = m_model.rowCount();
    justifyModelSize(m_numColumns, row + 1);
    for (int col = 0; col < m_numColumns; ++col) {
        setDataCell(col, row, limit);
    }

    planeDiagram->setModel(&m_model);

//TODO: add format to the line
}

void KReportChartView::removeLegend()
{
    Legend* chartLegend = Chart::legend();
    delete chartLegend;
}
