// xlsxchart.cpp

#include "xlsxcellrange.h"
#include "xlsxchart_p.h"
#include "xlsxutility_p.h"
#include "xlsxworksheet.h"

#include <QDebug>
#include <QIODevice>
#include <QString>
#include <QXmlStreamReader>
#include <QXmlStreamWriter>
#include <QtGlobal>

QT_BEGIN_NAMESPACE_XLSX

ChartPrivate::ChartPrivate(Chart *q, Chart::CreateFlag flag)
    : AbstractOOXmlFilePrivate(q, flag)
    , chartType(static_cast<Chart::ChartType>(0))
{
}

ChartPrivate::~ChartPrivate()
{
}

/*!
 * \internal
 */
Chart::Chart(AbstractSheet *parent, CreateFlag flag)
    : AbstractOOXmlFile(new ChartPrivate(this, flag))
{
    Q_D(Chart);

    d_func()->sheet = parent;

    // d->legendPos = Chart::ChartAxisPos::None;
    d->legendPos             = Chart::None;
    d->legendOverlay         = false;
    d->majorGridlinesEnabled = false;
    d->minorGridlinesEnabled = false;
}

/*!
 * Destroys the chart.
 */
Chart::~Chart()
{
}

/*!
 * Add the data series which is in the range \a range of the \a sheet.
 */
void Chart::addSeries(const CellRange &range,
                      AbstractSheet *sheet,
                      bool headerH,
                      bool headerV,
                      bool swapHeaders)
{
    Q_D(Chart);

    if (!range.isValid())
        return;
    if (sheet && sheet->sheetType() != AbstractSheet::ST_WorkSheet)
        return;
    if (!sheet && d->sheet->sheetType() != AbstractSheet::ST_WorkSheet)
        return;

    QString sheetName = sheet ? sheet->sheetName() : d->sheet->sheetName();
    // In case sheetName contains space or '
    sheetName = escapeSheetName(sheetName);

    if (range.columnCount() == 1 || range.rowCount() == 1) {
        auto series = std::make_shared<XlsxSeries>();
        series->numberDataSource_numRef =
            sheetName + QLatin1String("!") + range.toString(true, true);
        d->seriesList.append(series);
    } else if ((range.columnCount() < range.rowCount()) || swapHeaders) {
        // Column based series
        int firstDataRow    = range.firstRow();
        int firstDataColumn = range.firstColumn();

        QString axDataSouruce_numRef;
        if (d->chartType == CT_ScatterChart || d->chartType == CT_BubbleChart) {
            firstDataColumn += 1;
            CellRange subRange(
                range.firstRow(), range.firstColumn(), range.lastRow(), range.firstColumn());
            axDataSouruce_numRef = sheetName + QLatin1String("!") + subRange.toString(true, true);
        }

        if (headerH) {
            firstDataRow += 1;
        }
        if (headerV) {
            firstDataColumn += 1;
        }

        for (int col = firstDataColumn; col <= range.lastColumn(); ++col) {
            CellRange subRange(firstDataRow, col, range.lastRow(), col);
            auto series                 = std::make_shared<XlsxSeries>();
            series->axDataSource_numRef = axDataSouruce_numRef;
            series->numberDataSource_numRef =
                sheetName + QLatin1String("!") + subRange.toString(true, true);

            if (headerH) {
                CellRange subRange(range.firstRow(), col, range.firstRow(), col);
                series->headerH_numRef =
                    sheetName + QLatin1String("!") + subRange.toString(true, true);
            } else {
                series->headerH_numRef = QString();
            }
            if (headerV) {
                CellRange subRange(
                    firstDataRow, range.firstColumn(), range.lastRow(), range.firstColumn());
                series->headerV_numRef =
                    sheetName + QLatin1String("!") + subRange.toString(true, true);
            } else {
                series->headerV_numRef = QString();
            }
            series->swapHeader = swapHeaders;

            d->seriesList.append(series);
        }

    } else {
        // Row based series
        int firstDataRow    = range.firstRow();
        int firstDataColumn = range.firstColumn();

        QString axDataSouruce_numRef;
        if (d->chartType == CT_ScatterChart || d->chartType == CT_BubbleChart) {
            firstDataRow += 1;
            CellRange subRange(
                range.firstRow(), range.firstColumn(), range.firstRow(), range.lastColumn());
            axDataSouruce_numRef = sheetName + QLatin1String("!") + subRange.toString(true, true);
        }

        if (headerH) {
            firstDataRow += 1;
        }
        if (headerV) {
            firstDataColumn += 1;
        }

        for (int row = firstDataRow; row <= range.lastRow(); ++row) {
            CellRange subRange(row, firstDataColumn, row, range.lastColumn());
            auto series                 = std::make_shared<XlsxSeries>();
            series->axDataSource_numRef = axDataSouruce_numRef;
            series->numberDataSource_numRef =
                sheetName + QLatin1String("!") + subRange.toString(true, true);

            if (headerH) {
                CellRange subRange(
                    range.firstRow(), firstDataColumn, range.firstRow(), range.lastColumn());
                series->headerH_numRef =
                    sheetName + QLatin1String("!") + subRange.toString(true, true);
            } else {
                series->headerH_numRef = QString();
            }

            if (headerV) {
                CellRange subRange(row, range.firstColumn(), row, range.firstColumn());
                series->headerV_numRef =
                    sheetName + QLatin1String("!") + subRange.toString(true, true);
            } else {
                series->headerV_numRef = QString();
            }
            series->swapHeader = swapHeaders;

            d->seriesList.append(series);
        }
    }
}

/*!
 * Set the type of the chart to \a type
 */
void Chart::setChartType(ChartType type)
{
    Q_D(Chart);

    d->chartType = type;
}

/*!
 * \internal
 *
 */
void Chart::setChartStyle(int id)
{
    Q_UNUSED(id)
    //! Todo
}

void Chart::setAxisTitle(Chart::ChartAxisPos pos, QString axisTitle)
{
    Q_D(Chart);

    if (axisTitle.isEmpty())
        return;

    // dev24 : fixed for old compiler
    if (pos == Chart::Left) {
        d->axisNames[XlsxAxis::Left] = axisTitle;
    } else if (pos == Chart::Top) {
        d->axisNames[XlsxAxis::Top] = axisTitle;
    } else if (pos == Chart::Right) {
        d->axisNames[XlsxAxis::Right] = axisTitle;
    } else if (pos == Chart::Bottom) {
        d->axisNames[XlsxAxis::Bottom] = axisTitle;
    }
}

// dev25
void Chart::setChartTitle(QString strchartTitle)
{
    Q_D(Chart);

    d->chartTitle = strchartTitle;
}

void Chart::setChartLegend(Chart::ChartAxisPos legendPos, bool overlay)
{
    Q_D(Chart);

    d->legendPos     = legendPos;
    d->legendOverlay = overlay;
}

void Chart::setGridlinesEnable(bool majorGridlinesEnable, bool minorGridlinesEnable)
{
    Q_D(Chart);

    d->majorGridlinesEnabled = majorGridlinesEnable;
    d->minorGridlinesEnabled = minorGridlinesEnable;
}

/*!
 * \internal
 */
void Chart::saveToXmlFile(QIODevice *device) const
{
    Q_D(const Chart);

    /*
        <chartSpace>
            <chart>
                <view3D>
                    <perspective val="30"/>
                </view3D>
                <plotArea>
                    <layout/>
                    <barChart>
                    ...
                    </barChart>
                    <catAx/>
                    <valAx/>
                </plotArea>
                <legend>
                ...
                </legend>
            </chart>
            <printSettings>
            </printSettings>
        </chartSpace>
    */

    QXmlStreamWriter writer(device);

    writer.writeStartDocument(QStringLiteral("1.0"), true);

    // L.4.13.2.2 Chart
    //
    //  chartSpace is the root node, which contains an element defining the chart,
    // and an element defining the print settings for the chart.

    writer.writeStartElement(QStringLiteral("c:chartSpace"));

    writer.writeAttribute(QStringLiteral("xmlns:c"),
                          QStringLiteral("http://schemas.openxmlformats.org/drawingml/2006/chart"));
    writer.writeAttribute(QStringLiteral("xmlns:a"),
                          QStringLiteral("http://schemas.openxmlformats.org/drawingml/2006/main"));
    writer.writeAttribute(
        QStringLiteral("xmlns:r"),
        QStringLiteral("http://schemas.openxmlformats.org/officeDocument/2006/relationships"));

    /*
     * chart is the root element for the chart. If the chart is a 3D chart,
     * then a view3D element is contained, which specifies the 3D view.
     * It then has a plot area, which defines a layout and contains an element
     * that corresponds to, and defines, the type of chart.
     */

    d->saveXmlChart(writer);

    writer.writeEndElement(); // c:chartSpace
    writer.writeEndDocument();
}

/*!
 * \internal
 */
bool Chart::loadFromXmlFile(QIODevice *device)
{
    Q_D(Chart);

    QXmlStreamReader reader(device);
    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            if (reader.name() == QLatin1String("chart")) {
                if (!d->loadXmlChart(reader)) {
                    return false;
                }
            }
        }
    }

    return true;
}

bool ChartPrivate::loadXmlChart(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("chart"));

    //    qDebug() << "-------------- loadXmlChart";

    while (!reader.atEnd()) {
        reader.readNextStartElement();

        //        qDebug() << "-------------1- " << reader.name();

        if (reader.tokenType() == QXmlStreamReader::StartElement) {

            if (reader.name() == QLatin1String("plotArea")) {
                if (!loadXmlPlotArea(reader)) {
                    return false;
                }
            } else if (reader.name() == QLatin1String("title")) {
                //! Todo

                if (loadXmlChartTitle(reader)) {
                }
            }
            //            else if (reader.name() == QLatin1String("legend"))
            //            {
            //                loadXmlChartLegend(reader);
            //                qDebug() << "-------------- loadXmlChartLegend";
            //            }
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("chart")) {
            break;
        }
    }
    return true;
}

// TO DEBUG: loop is not work, when i looping second element.
/*
dchrt_CT_PlotArea =
    element layout { dchrt_CT_Layout }?,
    (element areaChart { dchrt_CT_AreaChart }
        | element area3DChart { dchrt_ CT_Area3DChart }
        | element lineChart { dchrt_CT_LineChart }
        | element line3DChart { dchrt_CT_Line3DChart }
        | element stockChart { dchrt_CT_StockChart }
        | element radarChart { dchrt_CT_RadarChart }
        | element scatterChart { dchrt_CT_ScatterChart }
        | element pieChart { dchrt_CT_PieChart }
        | element pie3DChart { dchrt_CT_Pie3DChart }
        | element doughnutChart { dchrt_CT_DoughnutChart }
        | element barChart { dchrt_CT_BarChart }
        | element bar3DChart { dchrt_CT_Bar3DChart }
        | element ofPieChart { dchrt_CT_OfPieChart }
        | element surfaceChart { dchrt_CT_SurfaceChart }
        | element surface3DChart { dchrt_CT_Surface3DChart }
        | element bubbleChart { dchrt_CT_BubbleChart })+,
    (element valAx { dchrt_CT_ValAx }
        | element catAx { dchrt_CT_CatAx }
        | element dateAx { dchrt_CT_DateAx }
        | element serAx { dchrt_CT_SerAx })*,
    element dTable { dchrt_CT_DTable }?,
    element spPr { a_CT_ShapeProperties }?,
    element extLst { dchrt_CT_ExtensionList }?
 */
bool ChartPrivate::loadXmlPlotArea(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("plotArea"));

    // TO DEBUG:

    reader.readNext();

    while (!reader.atEnd()) {
        //        qDebug() << "-------------2- " << reader.name();

        if (reader.isStartElement()) {
            if (!loadXmlPlotAreaElement(reader)) {
                qDebug() << "[debug] failed to load plotarea element.";
                return false;
            } else if (reader.name() == QLatin1String("legend")) // Why here?
            {
                loadXmlChartLegend(reader);
                //                qDebug() << "-------------- loadXmlChartLegend";
            }

            reader.readNext();
        } else {
            reader.readNext();
        }
    }

    return true;
}

bool ChartPrivate::loadXmlPlotAreaElement(QXmlStreamReader &reader)
{
    if (reader.name() == QLatin1String("layout")) {
        //! ToDo extract attributes
        layout = readSubTree(reader);
    } else if (reader.name().endsWith(QLatin1String("Chart"))) {
        // for pieChart, barChart, ... (choose one)
        if (!loadXmlXxxChart(reader)) {
            qDebug() << "[debug] failed to load chart";
            return false;
        }
    } else if (reader.name() == QLatin1String("catAx")) // choose one : catAx, dateAx, serAx, valAx
    {
        // qDebug() << "loadXmlAxisCatAx()";
        loadXmlAxisCatAx(reader);
    } else if (reader.name() == QLatin1String("dateAx")) // choose one : catAx, dateAx, serAx, valAx
    {
        // qDebug() << "loadXmlAxisDateAx()";
        loadXmlAxisDateAx(reader);
    } else if (reader.name() == QLatin1String("serAx")) // choose one : catAx, dateAx, serAx, valAx
    {
        // qDebug() << "loadXmlAxisSerAx()";
        loadXmlAxisSerAx(reader);
    } else if (reader.name() == QLatin1String("valAx")) // choose one : catAx, dateAx, serAx, valAx
    {
        // qDebug() << "loadXmlAxisValAx()";
        loadXmlAxisValAx(reader);
    } else if (reader.name() == QLatin1String("dTable")) {
        //! ToDo
        // dTable "CT_DTable"
        // reader.skipCurrentElement();
    } else if (reader.name() == QLatin1String("spPr")) {
        //! ToDo
        // spPr "a:CT_ShapeProperties"
        // reader.skipCurrentElement();
    } else if (reader.name() == QLatin1String("extLst")) {
        //! ToDo
        // extLst "CT_ExtensionList"
        // reader.skipCurrentElement();
    }

    return true;
}

bool ChartPrivate::loadXmlXxxChart(QXmlStreamReader &reader)
{
    const auto &name = reader.name();

    if (name == QLatin1String("areaChart")) {
        chartType = Chart::CT_AreaChart;
    } else if (name == QLatin1String("area3DChart")) {
        chartType = Chart::CT_Area3DChart;
    } else if (name == QLatin1String("lineChart")) {
        chartType = Chart::CT_LineChart;
    } else if (name == QLatin1String("line3DChart")) {
        chartType = Chart::CT_Line3DChart;
    } else if (name == QLatin1String("stockChart")) {
        chartType = Chart::CT_StockChart;
    } else if (name == QLatin1String("radarChart")) {
        chartType = Chart::CT_RadarChart;
    } else if (name == QLatin1String("scatterChart")) {
        chartType = Chart::CT_ScatterChart;
    } else if (name == QLatin1String("pieChart")) {
        chartType = Chart::CT_PieChart;
    } else if (name == QLatin1String("pie3DChart")) {
        chartType = Chart::CT_Pie3DChart;
    } else if (name == QLatin1String("doughnutChart")) {
        chartType = Chart::CT_DoughnutChart;
    } else if (name == QLatin1String("barChart")) {
        chartType = Chart::CT_BarChart;
    } else if (name == QLatin1String("bar3DChart")) {
        chartType = Chart::CT_Bar3DChart;
    } else if (name == QLatin1String("ofPieChart")) {
        chartType = Chart::CT_OfPieChart;
    } else if (name == QLatin1String("surfaceChart")) {
        chartType = Chart::CT_SurfaceChart;
    } else if (name == QLatin1String("surface3DChart")) {
        chartType = Chart::CT_Surface3DChart;
    } else if (name == QLatin1String("bubbleChart")) {
        chartType = Chart::CT_BubbleChart;
    } else {
        qDebug() << "[undefined chart type] " << name;
        chartType = Chart::CT_NoStatementChart;
        return false;
    }

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            // dev57

            if (reader.name() == QLatin1String("ser")) {
                loadXmlSer(reader);
            } else if (reader.name() == QLatin1String("varyColors")) {
            } else if (reader.name() == QLatin1String("barDir")) {
            } else if (reader.name() == QLatin1String("axId")) {
                //

            } else if (reader.name() == QLatin1String("scatterStyle")) {
            } else if (reader.name() == QLatin1String("holeSize")) {
            } else {
            }

        } else if (reader.tokenType() == QXmlStreamReader::EndElement && reader.name() == name) {
            break;
        }
    }

    return true;
}

bool ChartPrivate::loadXmlSer(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("ser"));

    auto series = std::make_shared<XlsxSeries>();
    seriesList.append(series);

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("ser"))) {
        if (reader.readNextStartElement()) {
            // TODO beide Header noch auswerten RTR 2019.11
            const auto &name = reader.name();
            if (name == QLatin1String("tx")) {
                while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                            reader.name() == name)) {
                    if (reader.readNextStartElement()) {
                        if (reader.name() == QLatin1String("strRef"))
                            series->headerV_numRef = loadXmlStrRef(reader);
                    }
                }
            } else if (name == QLatin1String("cat") || name == QLatin1String("xVal")) {
                while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                            reader.name() == name)) {
                    if (reader.readNextStartElement()) {
                        if (reader.name() == QLatin1String("numRef"))
                            series->axDataSource_numRef = loadXmlNumRef(reader);
                        else if (reader.name() == QLatin1String("strRef"))
                            series->headerH_numRef = loadXmlStrRef(reader);
                    }
                }
            } else if (name == QLatin1String("val") || name == QLatin1String("yVal")) {
                while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                            reader.name() == name)) {
                    if (reader.readNextStartElement()) {
                        if (reader.name() == QLatin1String("numRef"))
                            series->numberDataSource_numRef = loadXmlNumRef(reader);
                    }
                }
            } else if (name == QLatin1String("extLst")) {
                while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                            reader.name() == name)) {
                    reader.readNextStartElement();
                }
            }
        }
    }

    return true;
}

QString ChartPrivate::loadXmlNumRef(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("numRef"));

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("numRef"))) {
        if (reader.readNextStartElement()) {
            if (reader.name() == QLatin1String("f"))
                return reader.readElementText();
        }
    }

    return QString();
}

QString ChartPrivate::loadXmlStrRef(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("strRef"));

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("strRef"))) {
        if (reader.readNextStartElement()) {
            if (reader.name() == QLatin1String("f"))
                return reader.readElementText();
        }
    }

    return QString();
}

void ChartPrivate::saveXmlChart(QXmlStreamWriter &writer) const
{
    //----------------------------------------------------
    // c:chart
    writer.writeStartElement(QStringLiteral("c:chart"));

    //----------------------------------------------------
    // c:title

    saveXmlChartTitle(writer); // write 'chart title'

    //----------------------------------------------------
    // c:plotArea

    writer.writeStartElement(QStringLiteral("c:plotArea"));

    // a little workaround for Start- and EndElement with starting ">" and ending without ">"
    writer.device()->write("><c:layout>"); // layout
    writer.device()->write(layout.toUtf8());
    writer.device()->write("</c:layout"); // layout

    // dev35
    switch (chartType) {
    case Chart::CT_AreaChart:
        saveXmlAreaChart(writer);
        break;
    case Chart::CT_Area3DChart:
        saveXmlAreaChart(writer);
        break;
    case Chart::CT_LineChart:
        saveXmlLineChart(writer);
        break;
    case Chart::CT_Line3DChart:
        saveXmlLineChart(writer);
        break;
    case Chart::CT_StockChart:
        break;
    case Chart::CT_RadarChart:
        break;
    case Chart::CT_ScatterChart:
        saveXmlScatterChart(writer);
        break;
    case Chart::CT_PieChart:
        saveXmlPieChart(writer);
        break;
    case Chart::CT_Pie3DChart:
        saveXmlPieChart(writer);
        break;
    case Chart::CT_DoughnutChart:
        saveXmlDoughnutChart(writer);
        break;
    case Chart::CT_BarChart:
        saveXmlBarChart(writer);
        break;
    case Chart::CT_Bar3DChart:
        saveXmlBarChart(writer);
        break;
    case Chart::CT_OfPieChart:
        break;
    case Chart::CT_SurfaceChart:
        break;
    case Chart::CT_Surface3DChart:
        break;
    case Chart::CT_BubbleChart:
        break;
    default:
        break;
    }

    saveXmlAxis(writer); // c:catAx, c:valAx, c:serAx, c:dateAx (choose one)

    //! TODO: write element
    // c:dTable CT_DTable
    // c:spPr   CT_ShapeProperties
    // c:extLst CT_ExtensionList

    writer.writeEndElement(); // c:plotArea

    // c:legend
    saveXmlChartLegend(writer); // c:legend

    writer.writeEndElement(); // c:chart
}

bool ChartPrivate::loadXmlChartTitle(QXmlStreamReader &reader)
{
    //! TODO : load chart title

    Q_ASSERT(reader.name() == QLatin1String("title"));

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("title"))) {
        if (reader.readNextStartElement()) {
            if (reader.name() == QLatin1String("tx")) // c:tx
                return loadXmlChartTitleTx(reader);
        }
    }

    return false;
}

bool ChartPrivate::loadXmlChartTitleTx(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("tx"));

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("tx"))) {
        if (reader.readNextStartElement()) {
            if (reader.name() == QLatin1String("rich")) // c:rich
                return loadXmlChartTitleTxRich(reader);
        }
    }

    return false;
}

bool ChartPrivate::loadXmlChartTitleTxRich(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("rich"));

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("rich"))) {
        if (reader.readNextStartElement()) {
            if (reader.name() == QLatin1String("p")) // a:p
                return loadXmlChartTitleTxRichP(reader);
        }
    }

    return false;
}

bool ChartPrivate::loadXmlChartTitleTxRichP(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("p"));

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("p"))) {
        if (reader.readNextStartElement()) {
            if (reader.name() == QLatin1String("r")) // a:r
                return loadXmlChartTitleTxRichP_R(reader);
        }
    }

    return false;
}

bool ChartPrivate::loadXmlChartTitleTxRichP_R(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("r"));

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("r"))) {
        if (reader.readNextStartElement()) {
            if (reader.name() == QLatin1String("t")) // a:t
            {
                QString textValue = reader.readElementText();
                this->chartTitle  = textValue;
                return true;
            }
        }
    }

    return false;
}

// write 'chart title'
void ChartPrivate::saveXmlChartTitle(QXmlStreamWriter &writer) const
{
    if (chartTitle.isEmpty())
        return;

    writer.writeStartElement(QStringLiteral("c:title"));
    /*
    <xsd:complexType name="CT_Title">
        <xsd:sequence>
            <xsd:element name="tx"      type="CT_Tx"                minOccurs="0" maxOccurs="1"/>
            <xsd:element name="layout"  type="CT_Layout"            minOccurs="0" maxOccurs="1"/>
            <xsd:element name="overlay" type="CT_Boolean"           minOccurs="0" maxOccurs="1"/>
            <xsd:element name="spPr"    type="a:CT_ShapeProperties" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="txPr"    type="a:CT_TextBody"        minOccurs="0" maxOccurs="1"/>
            <xsd:element name="extLst"  type="CT_ExtensionList"     minOccurs="0" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
    */

    writer.writeStartElement(QStringLiteral("c:tx"));
    /*
    <xsd:complexType name="CT_Tx">
        <xsd:sequence>
            <xsd:choice     minOccurs="1"   maxOccurs="1">
            <xsd:element    name="strRef"   type="CT_StrRef"        minOccurs="1" maxOccurs="1"/>
            <xsd:element    name="rich"     type="a:CT_TextBody"    minOccurs="1" maxOccurs="1"/>
            </xsd:choice>
        </xsd:sequence>
    </xsd:complexType>
    */

    writer.writeStartElement(QStringLiteral("c:rich"));
    /*
    <xsd:complexType name="CT_TextBody">
        <xsd:sequence>
            <xsd:element name="bodyPr"      type="CT_TextBodyProperties"    minOccurs=" 1"
    maxOccurs="1"/> <xsd:element name="lstStyle"    type="CT_TextListStyle"         minOccurs="0"
    maxOccurs="1"/> <xsd:element name="p"           type="CT_TextParagraph"         minOccurs="1"
    maxOccurs="unbounded"/>
        </xsd:sequence>
    </xsd:complexType>
    */

    writer.writeEmptyElement(QStringLiteral("a:bodyPr")); // <a:bodyPr/>
    /*
    <xsd:complexType name="CT_TextBodyProperties">
        <xsd:sequence>
            <xsd:element name="prstTxWarp" type="CT_PresetTextShape" minOccurs="0" maxOccurs="1"/>
            <xsd:group ref="EG_TextAutofit" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="scene3d" type="CT_Scene3D" minOccurs="0" maxOccurs="1"/>
            <xsd:group ref="EG_Text3D" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="extLst" type="CT_OfficeArtExtensionList" minOccurs="0"
    maxOccurs="1"/>
        </xsd:sequence>
        <xsd:attribute name="rot" type="ST_Angle" use="optional"/>
        <xsd:attribute name="spcFirstLastPara" type="xsd:boolean" use="optional"/>
        <xsd:attribute name="vertOverflow" type="ST_TextVertOverflowType" use="optional"/>
        <xsd:attribute name="horzOverflow" type="ST_TextHorzOverflowType" use="optional"/>
        <xsd:attribute name="vert" type="ST_TextVerticalType" use="optional"/>
        <xsd:attribute name="wrap" type="ST_TextWrappingType" use="optional"/>
        <xsd:attribute name="lIns" type="ST_Coordinate32" use="optional"/>
        <xsd:attribute name="tIns" type="ST_Coordinate32" use="optional"/>
        <xsd:attribute name="rIns" type="ST_Coordinate32" use="optional"/>
        <xsd:attribute name="bIns" type="ST_Coordinate32" use="optional"/>
        <xsd:attribute name="numCol" type="ST_TextColumnCount" use="optional"/>
        <xsd:attribute name="spcCol" type="ST_PositiveCoordinate32" use="optional"/>
        <xsd:attribute name="rtlCol" type="xsd:boolean" use="optional"/>
        <xsd:attribute name="fromWordArt" type="xsd:boolean" use="optional"/>
        <xsd:attribute name="anchor" type="ST_TextAnchoringType" use="optional"/>
        <xsd:attribute name="anchorCtr" type="xsd:boolean" use="optional"/>
        <xsd:attribute name="forceAA" type="xsd:boolean" use="optional"/>
        <xsd:attribute name="upright" type="xsd:boolean" use="optional" default="false"/>
        <xsd:attribute name="compatLnSpc" type="xsd:boolean" use="optional"/>
    </xsd:complexType>
     */

    writer.writeEmptyElement(QStringLiteral("a:lstStyle")); // <a:lstStyle/>

    writer.writeStartElement(QStringLiteral("a:p"));
    /*
    <xsd:complexType name="CT_TextParagraph">
        <xsd:sequence>
            <xsd:element    name="pPr"          type="CT_TextParagraphProperties" minOccurs="0"
    maxOccurs="1"/> <xsd:group      ref="EG_TextRun"    minOccurs="0" maxOccurs="unbounded"/>
            <xsd:element    name="endParaRPr"   type="CT_TextCharacterProperties" minOccurs="0"
            maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
     */

    // <a:pPr lvl="0">
    writer.writeStartElement(QStringLiteral("a:pPr"));

    writer.writeAttribute(QStringLiteral("lvl"), QStringLiteral("0"));

    // <a:defRPr b="0"/>
    writer.writeStartElement(QStringLiteral("a:defRPr"));

    writer.writeAttribute(QStringLiteral("b"), QStringLiteral("0"));

    writer.writeEndElement(); // a:defRPr

    writer.writeEndElement(); // a:pPr

    /*
    <xsd:group name="EG_TextRun">
        <xsd:choice>
            <xsd:element name="r"   type="CT_RegularTextRun"/>
            <xsd:element name="br"  type="CT_TextLineBreak"/>
            <xsd:element name="fld" type="CT_TextField"/>
        </xsd:choice>
    </xsd:group>
    */

    writer.writeStartElement(QStringLiteral("a:r"));
    /*
    <xsd:complexType name="CT_RegularTextRun">
        <xsd:sequence>
            <xsd:element name="rPr" type="CT_TextCharacterProperties" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="t"   type="xsd:string" minOccurs="1" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
     */

    // <a:t>chart name</a:t>
    writer.writeTextElement(QStringLiteral("a:t"), chartTitle);

    writer.writeEndElement(); // a:r

    writer.writeEndElement(); // a:p

    writer.writeEndElement(); // c:rich

    writer.writeEndElement(); // c:tx

    // <c:overlay val="0"/>
    writer.writeStartElement(QStringLiteral("c:overlay"));
    writer.writeAttribute(QStringLiteral("val"), QStringLiteral("0"));
    writer.writeEndElement(); // c:overlay

    writer.writeEndElement(); // c:title
}
// }}

// write 'chart legend'
void ChartPrivate::saveXmlChartLegend(QXmlStreamWriter &writer) const
{
    if (legendPos == Chart::None)
        return;

    //    <c:legend>
    //    <c:legendPos val="r"/>
    //    <c:overlay val="0"/>
    //    </c:legend>

    writer.writeStartElement(QStringLiteral("c:legend"));

    writer.writeStartElement(QStringLiteral("c:legendPos"));

    QString pos;
    switch (legendPos) {
    // case Chart::ChartAxisPos::Right:
    case Chart::Right:
        pos = QStringLiteral("r");
        break;

    // case Chart::ChartAxisPos::Left:
    case Chart::Left:
        pos = QStringLiteral("l");
        break;

    // case Chart::ChartAxisPos::Top:
    case Chart::Top:
        pos = QStringLiteral("t");
        break;

    // case Chart::ChartAxisPos::Bottom:
    case Chart::Bottom:
        pos = QStringLiteral("b");
        break;

    default:
        pos = QStringLiteral("r");
        break;
    }

    writer.writeAttribute(QStringLiteral("val"), pos);

    writer.writeEndElement(); // c:legendPos

    writer.writeStartElement(QStringLiteral("c:overlay"));

    if (legendOverlay) {
        writer.writeAttribute(QStringLiteral("val"), QStringLiteral("1"));
    } else {
        writer.writeAttribute(QStringLiteral("val"), QStringLiteral("0"));
    }

    writer.writeEndElement(); // c:overlay

    writer.writeEndElement(); // c:legend
}

void ChartPrivate::saveXmlPieChart(QXmlStreamWriter &writer) const
{
    QString name = chartType == Chart::CT_PieChart ? QStringLiteral("c:pieChart")
                                                   : QStringLiteral("c:pie3DChart");

    writer.writeStartElement(name);

    // Do the same behavior as Excel, Pie prefer varyColors
    writer.writeEmptyElement(QStringLiteral("c:varyColors"));
    writer.writeAttribute(QStringLiteral("val"), QStringLiteral("1"));

    for (int i = 0; i < seriesList.size(); ++i)
        saveXmlSer(writer, seriesList[i].get(), i);

    writer.writeEndElement(); // pieChart, pie3DChart
}

void ChartPrivate::saveXmlBarChart(QXmlStreamWriter &writer) const
{
    QString name = chartType == Chart::CT_BarChart ? QStringLiteral("c:barChart")
                                                   : QStringLiteral("c:bar3DChart");

    writer.writeStartElement(name);

    writer.writeEmptyElement(QStringLiteral("c:barDir"));
    writer.writeAttribute(QStringLiteral("val"), QStringLiteral("col"));

    for (int i = 0; i < seriesList.size(); ++i) {
        saveXmlSer(writer, seriesList[i].get(), i);
    }

    if (axisList.isEmpty()) {
        const_cast<ChartPrivate *>(this)->axisList.append(std::make_shared<XlsxAxis>(
            XlsxAxis::T_Cat, XlsxAxis::Bottom, 0, 1, axisNames[XlsxAxis::Bottom]));

        const_cast<ChartPrivate *>(this)->axisList.append(std::make_shared<XlsxAxis>(
            XlsxAxis::T_Val, XlsxAxis::Left, 1, 0, axisNames[XlsxAxis::Left]));
    }

    // Note: Bar3D have 2~3 axes
    // int axisListSize = axisList.size();
    // [dev62]
    // Q_ASSERT( axisListSize == 2 ||
    //          ( axisListSize == 3 && chartType == Chart::CT_Bar3DChart ) );

    for (int i = 0; i < axisList.size(); ++i) {
        writer.writeEmptyElement(QStringLiteral("c:axId"));
        writer.writeAttribute(QStringLiteral("val"), QString::number(axisList[i]->axisId));
    }

    writer.writeEndElement(); // barChart, bar3DChart
}

void ChartPrivate::saveXmlLineChart(QXmlStreamWriter &writer) const
{
    QString name = chartType == Chart::CT_LineChart ? QStringLiteral("c:lineChart")
                                                    : QStringLiteral("c:line3DChart");

    writer.writeStartElement(name);

    // writer.writeEmptyElement(QStringLiteral("grouping")); // dev22

    for (int i = 0; i < seriesList.size(); ++i)
        saveXmlSer(writer, seriesList[i].get(), i);

    if (axisList.isEmpty()) {
        const_cast<ChartPrivate *>(this)->axisList.append(std::make_shared<XlsxAxis>(
            XlsxAxis::T_Cat, XlsxAxis::Bottom, 0, 1, axisNames[XlsxAxis::Bottom]));
        const_cast<ChartPrivate *>(this)->axisList.append(std::make_shared<XlsxAxis>(
            XlsxAxis::T_Val, XlsxAxis::Left, 1, 0, axisNames[XlsxAxis::Left]));
        if (chartType == Chart::CT_Line3DChart)
            const_cast<ChartPrivate *>(this)->axisList.append(
                std::make_shared<XlsxAxis>(XlsxAxis::T_Ser, XlsxAxis::Bottom, 2, 0));
    }

    Q_ASSERT((axisList.size() == 2 || chartType == Chart::CT_LineChart) ||
             (axisList.size() == 3 && chartType == Chart::CT_Line3DChart));

    for (int i = 0; i < axisList.size(); ++i) {
        writer.writeEmptyElement(QStringLiteral("c:axId"));
        writer.writeAttribute(QStringLiteral("val"), QString::number(axisList[i]->axisId));
    }

    writer.writeEndElement(); // lineChart, line3DChart
}

void ChartPrivate::saveXmlScatterChart(QXmlStreamWriter &writer) const
{
    const QString name = QStringLiteral("c:scatterChart");

    writer.writeStartElement(name);

    writer.writeEmptyElement(QStringLiteral("c:scatterStyle"));

    for (int i = 0; i < seriesList.size(); ++i)
        saveXmlSer(writer, seriesList[i].get(), i);

    if (axisList.isEmpty()) {
        const_cast<ChartPrivate *>(this)->axisList.append(std::make_shared<XlsxAxis>(
            XlsxAxis::T_Val, XlsxAxis::Bottom, 0, 1, axisNames[XlsxAxis::Bottom]));
        const_cast<ChartPrivate *>(this)->axisList.append(std::make_shared<XlsxAxis>(
            XlsxAxis::T_Val, XlsxAxis::Left, 1, 0, axisNames[XlsxAxis::Left]));
    }

    int axisListSize = axisList.size();
    Q_ASSERT(axisListSize == 2);

    for (int i = 0; i < axisList.size(); ++i) {
        writer.writeEmptyElement(QStringLiteral("c:axId"));
        writer.writeAttribute(QStringLiteral("val"), QString::number(axisList[i]->axisId));
    }

    writer.writeEndElement(); // c:scatterChart
}

void ChartPrivate::saveXmlAreaChart(QXmlStreamWriter &writer) const
{
    QString name = chartType == Chart::CT_AreaChart ? QStringLiteral("c:areaChart")
                                                    : QStringLiteral("c:area3DChart");

    writer.writeStartElement(name);

    // writer.writeEmptyElement(QStringLiteral("grouping")); // dev22

    for (int i = 0; i < seriesList.size(); ++i)
        saveXmlSer(writer, seriesList[i].get(), i);

    if (axisList.isEmpty()) {
        const_cast<ChartPrivate *>(this)->axisList.append(
            std::make_shared<XlsxAxis>(XlsxAxis::T_Cat, XlsxAxis::Bottom, 0, 1));
        const_cast<ChartPrivate *>(this)->axisList.append(
            std::make_shared<XlsxAxis>(XlsxAxis::T_Val, XlsxAxis::Left, 1, 0));
    }

    // Note: Area3D have 2~3 axes
    Q_ASSERT(axisList.size() == 2 || (axisList.size() == 3 && chartType == Chart::CT_Area3DChart));

    for (int i = 0; i < axisList.size(); ++i) {
        writer.writeEmptyElement(QStringLiteral("c:axId"));
        writer.writeAttribute(QStringLiteral("val"), QString::number(axisList[i]->axisId));
    }

    writer.writeEndElement(); // lineChart, line3DChart
}

void ChartPrivate::saveXmlDoughnutChart(QXmlStreamWriter &writer) const
{
    QString name = QStringLiteral("c:doughnutChart");

    writer.writeStartElement(name);

    writer.writeEmptyElement(QStringLiteral("c:varyColors"));
    writer.writeAttribute(QStringLiteral("val"), QStringLiteral("1"));

    for (int i = 0; i < seriesList.size(); ++i)
        saveXmlSer(writer, seriesList[i].get(), i);

    writer.writeStartElement(QStringLiteral("c:holeSize"));
    writer.writeAttribute(QStringLiteral("val"), QString::number(50));

    writer.writeEndElement();
}

void ChartPrivate::saveXmlSer(QXmlStreamWriter &writer, XlsxSeries *ser, int id) const
{

    writer.writeStartElement(QStringLiteral("c:ser"));
    writer.writeEmptyElement(QStringLiteral("c:idx"));
    writer.writeAttribute(QStringLiteral("val"), QString::number(id));
    writer.writeEmptyElement(QStringLiteral("c:order"));
    writer.writeAttribute(QStringLiteral("val"), QString::number(id));

    QString header1;
    QString header2;
    if (ser->swapHeader) {
        header1 = ser->headerH_numRef;
        header2 = ser->headerV_numRef;
    } else {
        header1 = ser->headerV_numRef;
        header2 = ser->headerH_numRef;
    }

    if (!header1.isEmpty()) {
        writer.writeStartElement(QStringLiteral("c:tx"));
        writer.writeStartElement(QStringLiteral("c:strRef"));
        writer.writeTextElement(QStringLiteral("c:f"), header1);
        writer.writeEndElement();
        writer.writeEndElement();
    }
    if (!header2.isEmpty()) {
        writer.writeStartElement(QStringLiteral("c:cat"));
        writer.writeStartElement(QStringLiteral("c:strRef"));
        writer.writeTextElement(QStringLiteral("c:f"), header2);
        writer.writeEndElement();
        writer.writeEndElement();
    }

#if 0
    if (!ser->axDataSource_numRef.isEmpty())
    {
        if (chartType == Chart::CT_ScatterChart || chartType == Chart::CT_BubbleChart)
        {
            writer.writeStartElement(QStringLiteral("c:xVal"));
        }
        else
        {
            writer.writeStartElement(QStringLiteral("c:cat"));
        }

        writer.writeStartElement(QStringLiteral("c:numRef"));
        writer.writeTextElement(QStringLiteral("c:f"), ser->axDataSource_numRef);
        writer.writeEndElement();//c:numRef
        writer.writeEndElement();//c:cat or c:xVal
    }
#endif

    if (!ser->numberDataSource_numRef.isEmpty()) {
        if (chartType == Chart::CT_ScatterChart || chartType == Chart::CT_BubbleChart)
            writer.writeStartElement(QStringLiteral("c:yVal"));
        else
            writer.writeStartElement(QStringLiteral("c:val"));
        writer.writeStartElement(QStringLiteral("c:numRef"));
        writer.writeTextElement(QStringLiteral("c:f"), ser->numberDataSource_numRef);
        writer.writeEndElement(); // c:numRef
        writer.writeEndElement(); // c:val or c:yVal
    }

    writer.writeEndElement(); // c:ser
}

bool ChartPrivate::loadXmlAxisCatAx(QXmlStreamReader &reader)
{

    auto axis  = std::make_shared<XlsxAxis>();
    axis->type = XlsxAxis::T_Cat;
    axisList.append(axis);

    // load EG_AxShared
    if (!loadXmlAxisEG_AxShared(reader, axis.get())) {
        qDebug() << "failed to load EG_AxShared";
        return false;
    }

    //! TODO: load element
    // auto
    // lblAlgn
    // lblOffset
    // tickLblSkip
    // tickMarkSkip
    // noMultiLvlLbl
    // extLst

    return true;
}

bool ChartPrivate::loadXmlAxisDateAx(QXmlStreamReader &reader)
{

    auto axis  = std::make_shared<XlsxAxis>();
    axis->type = XlsxAxis::T_Date;
    axisList.append(axis);

    // load EG_AxShared
    if (!loadXmlAxisEG_AxShared(reader, axis.get())) {
        qDebug() << "failed to load EG_AxShared";
        return false;
    }

    //! TODO: load element
    // auto
    // lblOffset
    // baseTimeUnit
    // majorUnit
    // majorTimeUnit
    // minorUnit
    // minorTimeUnit
    // extLst

    return true;
}

bool ChartPrivate::loadXmlAxisSerAx(QXmlStreamReader &reader)
{

    auto axis  = std::make_shared<XlsxAxis>();
    axis->type = XlsxAxis::T_Ser;
    axisList.append(axis);

    // load EG_AxShared
    if (!loadXmlAxisEG_AxShared(reader, axis.get())) {
        qDebug() << "failed to load EG_AxShared";
        return false;
    }

    //! TODO: load element
    // tickLblSkip
    // tickMarkSkip
    // extLst

    return true;
}

bool ChartPrivate::loadXmlAxisValAx(QXmlStreamReader &reader)
{
    Q_ASSERT(reader.name() == QLatin1String("valAx"));

    auto axis  = std::make_shared<XlsxAxis>();
    axis->type = XlsxAxis::T_Val;
    axisList.append(axis);

    if (!loadXmlAxisEG_AxShared(reader, axis.get())) {
        qDebug() << "failed to load EG_AxShared";
        return false;
    }

    //! TODO: load element
    // crossBetween
    // majorUnit
    // minorUnit
    // dispUnits
    // extLst

    return true;
}

/*
<xsd:group name="EG_AxShared">
    <xsd:sequence>
        <xsd:element name="axId" type="CT_UnsignedInt" minOccurs="1" maxOccurs="1"/> (*)(M)
        <xsd:element name="scaling" type="CT_Scaling" minOccurs="1" maxOccurs="1"/> (*)(M)
        <xsd:element name="delete" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="axPos" type="CT_AxPos" minOccurs="1" maxOccurs="1"/> (*)(M)
        <xsd:element name="majorGridlines" type="CT_ChartLines" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="minorGridlines" type="CT_ChartLines" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="title" type="CT_Title" minOccurs="0" maxOccurs="1"/> (*)
        <xsd:element name="numFmt" type="CT_NumFmt" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="majorTickMark" type="CT_TickMark" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="minorTickMark" type="CT_TickMark" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="tickLblPos" type="CT_TickLblPos" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="spPr" type="a:CT_ShapeProperties" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="txPr" type="a:CT_TextBody" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="crossAx" type="CT_UnsignedInt" minOccurs="1" maxOccurs="1"/> (*)(M)
        <xsd:choice minOccurs="0" maxOccurs="1">
            <xsd:element name="crosses" type="CT_Crosses" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="crossesAt" type="CT_Double" minOccurs="1" maxOccurs="1"/>
        </xsd:choice>
    </xsd:sequence>
</xsd:group>
*/
bool ChartPrivate::loadXmlAxisEG_AxShared(QXmlStreamReader &reader, XlsxAxis *axis)
{
    Q_ASSERT(nullptr != axis);
    Q_ASSERT(reader.name().endsWith(QLatin1String("Ax")));
    QString name = reader.name().toString(); //

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            // qDebug() << "[debug]" << QTime::currentTime() << reader.name().toString();

            if (reader.name() == QLatin1String("axId")) // mandatory element
            {
                // dev57
                uint axId = reader.attributes().value(QStringLiteral("val")).toUInt(); // for Qt5.1
                axis->axisId = axId;
            } else if (reader.name() == QLatin1String("scaling")) {
                // mandatory element

                loadXmlAxisEG_AxShared_Scaling(reader, axis);
            } else if (reader.name() == QLatin1String("delete")) {
                //! TODO
            } else if (reader.name() == QLatin1String("axPos")) {
                // mandatory element

                QString axPosVal = reader.attributes().value(QLatin1String("val")).toString();

                if (axPosVal == QLatin1String("l")) {
                    axis->axisPos = XlsxAxis::Left;
                } else if (axPosVal == QLatin1String("r")) {
                    axis->axisPos = XlsxAxis::Right;
                } else if (axPosVal == QLatin1String("t")) {
                    axis->axisPos = XlsxAxis::Top;
                } else if (axPosVal == QLatin1String("b")) {
                    axis->axisPos = XlsxAxis::Bottom;
                }
            } else if (reader.name() == QLatin1String("majorGridlines")) {
                //! TODO anything else?
                majorGridlinesEnabled = true;
            } else if (reader.name() == QLatin1String("minorGridlines")) {
                //! TODO anything else?
                minorGridlinesEnabled = true;
            } else if (reader.name() == QLatin1String("title")) {
                // title
                if (!loadXmlAxisEG_AxShared_Title(reader, axis)) {
                    qDebug() << "failed to load EG_AxShared title.";
                    Q_ASSERT(false);
                    return false;
                }
            } else if (reader.name() == QLatin1String("numFmt")) {
                //! TODO
            } else if (reader.name() == QLatin1String("majorTickMark")) {
                //! TODO
            } else if (reader.name() == QLatin1String("minorTickMark")) {
                //! TODO
            } else if (reader.name() == QLatin1String("tickLblPos")) {
                //! TODO
            } else if (reader.name() == QLatin1String("spPr")) {
                //! TODO
            } else if (reader.name() == QLatin1String("txPr")) {
                //! TODO
            } else if (reader.name() == QLatin1String("crossAx")) // mandatory element
            {
                // dev57
                uint crossAx =
                    reader.attributes().value(QLatin1String("val")).toUInt(); // for Qt5.1
                axis->crossAx = crossAx;
            } else if (reader.name() == QLatin1String("crosses")) {
                //! TODO
            } else if (reader.name() == QLatin1String("crossesAt")) {
                //! TODO
            }

            // reader.readNext();
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name().toString() == name) {
            break;
        }
    }

    return true;
}

bool ChartPrivate::loadXmlAxisEG_AxShared_Scaling(QXmlStreamReader &reader, XlsxAxis *axis)
{
    Q_UNUSED(axis);
    Q_ASSERT(reader.name() == QLatin1String("scaling"));

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            if (reader.name() == QLatin1String("orientation")) {
            } else {
            }
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("scaling")) {
            break;
        }
    }

    return true;
}

/*
  <xsd:complexType name="CT_Title">
      <xsd:sequence>
          <xsd:element name="tx" type="CT_Tx" minOccurs="0" maxOccurs="1"/>
          <xsd:element name="layout" type="CT_Layout" minOccurs="0" maxOccurs="1"/>
          <xsd:element name="overlay" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
          <xsd:element name="spPr" type="a:CT_ShapeProperties" minOccurs="0" maxOccurs="1"/>
          <xsd:element name="txPr" type="a:CT_TextBody" minOccurs="0" maxOccurs="1"/>
          <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
      </xsd:sequence>
  </xsd:complexType>

<xsd:complexType name="CT_Tx">
    <xsd:sequence>
        <xsd:choice minOccurs="1" maxOccurs="1">
            <xsd:element name="strRef" type="CT_StrRef" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="rich" type="a:CT_TextBody" minOccurs="1" maxOccurs="1"/>
        </xsd:choice>
    </xsd:sequence>
</xsd:complexType>

<xsd:complexType name="CT_StrRef">
    <xsd:sequence>
        <xsd:element name="f" type="xsd:string" minOccurs="1" maxOccurs="1"/>
        <xsd:element name="strCache" type="CT_StrData" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
</xsd:complexType>

<xsd:complexType name="CT_TextBody">
    <xsd:sequence>
        <xsd:element name="bodyPr" type="CT_TextBodyProperties" minOccurs="1" maxOccurs="1"/>
        <xsd:element name="lstStyle" type="CT_TextListStyle" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="p" type="CT_TextParagraph" minOccurs="1" maxOccurs="unbounded"/>
    </xsd:sequence>
</xsd:complexType>
  */
bool ChartPrivate::loadXmlAxisEG_AxShared_Title(QXmlStreamReader &reader, XlsxAxis *axis)
{
    Q_ASSERT(reader.name() == QLatin1String("title"));

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            if (reader.name() == QLatin1String("tx")) {
                loadXmlAxisEG_AxShared_Title_Tx(reader, axis);
            } else if (reader.name() == QLatin1String("overlay")) {
                //! TODO: load overlay
                loadXmlAxisEG_AxShared_Title_Overlay(reader, axis);
            } else {
            }
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("title")) {
            break;
        }
    }

    return true;
}

bool ChartPrivate::loadXmlAxisEG_AxShared_Title_Overlay(QXmlStreamReader &reader, XlsxAxis *axis)
{
    Q_UNUSED(axis);
    Q_ASSERT(reader.name() == QLatin1String("overlay"));

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("overlay")) {
            break;
        }
    }

    return true;
}

bool ChartPrivate::loadXmlAxisEG_AxShared_Title_Tx(QXmlStreamReader &reader, XlsxAxis *axis)
{
    Q_ASSERT(reader.name() == QLatin1String("tx"));

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            if (reader.name() == QLatin1String("rich")) {
                loadXmlAxisEG_AxShared_Title_Tx_Rich(reader, axis);
            } else {
            }
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("tx")) {
            break;
        }
    }

    return true;
}

bool ChartPrivate::loadXmlAxisEG_AxShared_Title_Tx_Rich(QXmlStreamReader &reader, XlsxAxis *axis)
{
    Q_ASSERT(reader.name() == QLatin1String("rich"));

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            if (reader.name() == QLatin1String("p")) {
                loadXmlAxisEG_AxShared_Title_Tx_Rich_P(reader, axis);
            } else {
            }
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("rich")) {
            break;
        }
    }

    return true;
}

bool ChartPrivate::loadXmlAxisEG_AxShared_Title_Tx_Rich_P(QXmlStreamReader &reader, XlsxAxis *axis)
{
    Q_ASSERT(reader.name() == QLatin1String("p"));

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            if (reader.name() == QLatin1String("r")) {
                loadXmlAxisEG_AxShared_Title_Tx_Rich_P_R(reader, axis);
            } else if (reader.name() == QLatin1String("pPr")) {
                loadXmlAxisEG_AxShared_Title_Tx_Rich_P_pPr(reader, axis);
            } else {
            }
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("p")) {
            break;
        }
    }

    return true;
}

bool ChartPrivate::loadXmlAxisEG_AxShared_Title_Tx_Rich_P_pPr(QXmlStreamReader &reader,
                                                              XlsxAxis *axis)
{
    Q_UNUSED(axis);
    Q_ASSERT(reader.name() == QLatin1String("pPr"));

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            if (reader.name() == QLatin1String("defRPr")) {
                reader.readElementText();
            } else {
            }
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("pPr")) {
            break;
        }
    }

    return true;
}

bool ChartPrivate::loadXmlAxisEG_AxShared_Title_Tx_Rich_P_R(QXmlStreamReader &reader,
                                                            XlsxAxis *axis)
{
    Q_ASSERT(reader.name() == QLatin1String("r"));

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            if (reader.name() == QLatin1String("t")) {
                QString strAxisName       = reader.readElementText();
                XlsxAxis::AxisPos axisPos = axis->axisPos;
                axis->axisNames[axisPos]  = strAxisName;
            } else {
            }
        } else if (reader.tokenType() == QXmlStreamReader::EndElement &&
                   reader.name() == QLatin1String("r")) {
            break;
        }
    }

    return true;
}

/*
<xsd:complexType name="CT_PlotArea">
    <xsd:sequence>
        <xsd:element name="layout" type="CT_Layout" minOccurs="0" maxOccurs="1"/>
        <xsd:choice minOccurs="1" maxOccurs="unbounded">
            <xsd:element name="areaChart" type="CT_AreaChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="area3DChart" type="CT_Area3DChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="lineChart" type="CT_LineChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="line3DChart" type="CT_Line3DChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="stockChart" type="CT_StockChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="radarChart" type="CT_RadarChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="scatterChart" type="CT_ScatterChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="pieChart" type="CT_PieChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="pie3DChart" type="CT_Pie3DChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="doughnutChart" type="CT_DoughnutChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="barChart" type="CT_BarChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="bar3DChart" type="CT_Bar3DChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="ofPieChart" type="CT_OfPieChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="surfaceChart" type="CT_SurfaceChart" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="surface3DChart" type="CT_Surface3DChart" minOccurs="1"
maxOccurs="1"/> <xsd:element name="bubbleChart" type="CT_BubbleChart" minOccurs="1" maxOccurs="1"/>
        </xsd:choice>
        <xsd:choice minOccurs="0" maxOccurs="unbounded">
            <xsd:element name="valAx" type="CT_ValAx" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="catAx" type="CT_CatAx" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="dateAx" type="CT_DateAx" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="serAx" type="CT_SerAx" minOccurs="1" maxOccurs="1"/>
        </xsd:choice>
        <xsd:element name="dTable" type="CT_DTable" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="spPr" type="a:CT_ShapeProperties" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
</xsd:complexType>
*/

/*
<xsd:complexType name="CT_CatAx">
    <xsd:sequence>
        <xsd:group ref="EG_AxShared" minOccurs="1" maxOccurs="1"/>
        <xsd:element name="auto" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="lblAlgn" type="CT_LblAlgn" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="lblOffset" type="CT_LblOffset" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="tickLblSkip" type="CT_Skip" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="tickMarkSkip" type="CT_Skip" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="noMultiLvlLbl" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
</xsd:complexType>
<!----------------------------------------------------------------------------->
<xsd:complexType name="CT_DateAx">
    <xsd:sequence>
        <xsd:group ref="EG_AxShared" minOccurs="1" maxOccurs="1"/>
        <xsd:element name="auto" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="lblOffset" type="CT_LblOffset" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="baseTimeUnit" type="CT_TimeUnit" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="majorUnit" type="CT_AxisUnit" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="majorTimeUnit" type="CT_TimeUnit" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="minorUnit" type="CT_AxisUnit" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="minorTimeUnit" type="CT_TimeUnit" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
</xsd:complexType>
<!----------------------------------------------------------------------------->
<xsd:complexType name="CT_SerAx">
    <xsd:sequence>
    <xsd:group ref="EG_AxShared" minOccurs="1" maxOccurs="1"/>
        <xsd:element name="tickLblSkip" type="CT_Skip" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="tickMarkSkip" type="CT_Skip" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
</xsd:complexType>
<!----------------------------------------------------------------------------->
<xsd:complexType name="CT_ValAx">
    <xsd:sequence>
        <xsd:group ref="EG_AxShared" minOccurs="1" maxOccurs="1"/>
        <xsd:element name="crossBetween" type="CT_CrossBetween" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="majorUnit" type="CT_AxisUnit" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="minorUnit" type="CT_AxisUnit" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="dispUnits" type="CT_DispUnits" minOccurs="0" maxOccurs="1"/>
        <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
</xsd:complexType>
*/

void ChartPrivate::saveXmlAxis(QXmlStreamWriter &writer) const
{
    for (int i = 0; i < axisList.size(); ++i) {
        XlsxAxis *axis = axisList[i].get();
        if (nullptr == axis)
            continue;

        if (axis->type == XlsxAxis::T_Cat) {
            saveXmlAxisCatAx(writer, axis);
        }
        if (axis->type == XlsxAxis::T_Val) {
            saveXmlAxisValAx(writer, axis);
        }
        if (axis->type == XlsxAxis::T_Ser) {
            saveXmlAxisSerAx(writer, axis);
        }
        if (axis->type == XlsxAxis::T_Date) {
            saveXmlAxisDateAx(writer, axis);
        }
    }
}

void ChartPrivate::saveXmlAxisCatAx(QXmlStreamWriter &writer, XlsxAxis *axis) const
{
    /*
    <xsd:complexType name="CT_CatAx">
        <xsd:sequence>
            <xsd:group ref="EG_AxShared" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="auto" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="lblAlgn" type="CT_LblAlgn" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="lblOffset" type="CT_LblOffset" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="tickLblSkip" type="CT_Skip" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="tickMarkSkip" type="CT_Skip" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="noMultiLvlLbl" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
    */

    writer.writeStartElement(QStringLiteral("c:catAx"));

    saveXmlAxisEG_AxShared(writer, axis); // EG_AxShared

    //! TODO: write element
    // auto
    // lblAlgn
    // lblOffset
    // tickLblSkip
    // tickMarkSkip
    // noMultiLvlLbl
    // extLst

    writer.writeEndElement(); // c:catAx
}

void ChartPrivate::saveXmlAxisDateAx(QXmlStreamWriter &writer, XlsxAxis *axis) const
{
    /*
    <xsd:complexType name="CT_DateAx">
        <xsd:sequence>
            <xsd:group ref="EG_AxShared" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="auto" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="lblOffset" type="CT_LblOffset" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="baseTimeUnit" type="CT_TimeUnit" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="majorUnit" type="CT_AxisUnit" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="majorTimeUnit" type="CT_TimeUnit" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="minorUnit" type="CT_AxisUnit" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="minorTimeUnit" type="CT_TimeUnit" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
    */

    writer.writeStartElement(QStringLiteral("c:dateAx"));

    saveXmlAxisEG_AxShared(writer, axis); // EG_AxShared

    //! TODO: write element
    // auto
    // lblOffset
    // baseTimeUnit
    // majorUnit
    // majorTimeUnit
    // minorUnit
    // minorTimeUnit
    // extLst

    writer.writeEndElement(); // c:dateAx
}

void ChartPrivate::saveXmlAxisSerAx(QXmlStreamWriter &writer, XlsxAxis *axis) const
{
    /*
    <xsd:complexType name="CT_SerAx">
        <xsd:sequence>
        <xsd:group ref="EG_AxShared" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="tickLblSkip" type="CT_Skip" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="tickMarkSkip" type="CT_Skip" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
    */

    writer.writeStartElement(QStringLiteral("c:serAx"));

    saveXmlAxisEG_AxShared(writer, axis); // EG_AxShared

    //! TODO: write element
    // tickLblSkip
    // tickMarkSkip
    // extLst

    writer.writeEndElement(); // c:serAx
}

void ChartPrivate::saveXmlAxisValAx(QXmlStreamWriter &writer, XlsxAxis *axis) const
{
    /*
    <xsd:complexType name="CT_ValAx">
        <xsd:sequence>
            <xsd:group ref="EG_AxShared" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="crossBetween" type="CT_CrossBetween" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="majorUnit" type="CT_AxisUnit" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="minorUnit" type="CT_AxisUnit" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="dispUnits" type="CT_DispUnits" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
    */

    writer.writeStartElement(QStringLiteral("c:valAx"));

    saveXmlAxisEG_AxShared(writer, axis); // EG_AxShared

    //! TODO: write element
    // crossBetween
    // majorUnit
    // minorUnit
    // dispUnits
    // extLst

    writer.writeEndElement(); // c:valAx
}

void ChartPrivate::saveXmlAxisEG_AxShared(QXmlStreamWriter &writer, XlsxAxis *axis) const
{
    /*
    <xsd:group name="EG_AxShared">
        <xsd:sequence>
            <xsd:element name="axId" type="CT_UnsignedInt" minOccurs="1" maxOccurs="1"/> (*)
            <xsd:element name="scaling" type="CT_Scaling" minOccurs="1" maxOccurs="1"/> (*)
            <xsd:element name="delete" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="axPos" type="CT_AxPos" minOccurs="1" maxOccurs="1"/> (*)
            <xsd:element name="majorGridlines" type="CT_ChartLines" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="minorGridlines" type="CT_ChartLines" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="title" type="CT_Title" minOccurs="0" maxOccurs="1"/>
    (***********************) <xsd:element name="numFmt" type="CT_NumFmt" minOccurs="0"
    maxOccurs="1"/> <xsd:element name="majorTickMark" type="CT_TickMark" minOccurs="0"
    maxOccurs="1"/> <xsd:element name="minorTickMark" type="CT_TickMark" minOccurs="0"
    maxOccurs="1"/> <xsd:element name="tickLblPos" type="CT_TickLblPos" minOccurs="0"
    maxOccurs="1"/> <xsd:element name="spPr" type="a:CT_ShapeProperties" minOccurs="0"
    maxOccurs="1"/> <xsd:element name="txPr" type="a:CT_TextBody" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="crossAx" type="CT_UnsignedInt" minOccurs="1" maxOccurs="1"/> (*)
            <xsd:choice minOccurs="0" maxOccurs="1">
                <xsd:element name="crosses" type="CT_Crosses" minOccurs="1" maxOccurs="1"/>
                <xsd:element name="crossesAt" type="CT_Double" minOccurs="1" maxOccurs="1"/>
            </xsd:choice>
        </xsd:sequence>
    </xsd:group>
    */

    writer.writeEmptyElement(
        QStringLiteral("c:axId")); // 21.2.2.9. axId (Axis ID) (mandatory value)
    writer.writeAttribute(QStringLiteral("val"), QString::number(axis->axisId));

    writer.writeStartElement(QStringLiteral("c:scaling"));     // CT_Scaling (mandatory value)
    writer.writeEmptyElement(QStringLiteral("c:orientation")); // CT_Orientation
    writer.writeAttribute(QStringLiteral("val"), QStringLiteral("minMax")); // ST_Orientation
    writer.writeEndElement();                                               // c:scaling

    writer.writeEmptyElement(QStringLiteral("c:axPos")); // axPos CT_AxPos (mandatory value)
    QString pos = GetAxisPosString(axis->axisPos);
    if (!pos.isEmpty()) {
        writer.writeAttribute(QStringLiteral("val"), pos); // ST_AxPos
    }

    if (majorGridlinesEnabled) {
        writer.writeEmptyElement(QStringLiteral("c:majorGridlines"));
    }
    if (minorGridlinesEnabled) {
        writer.writeEmptyElement(QStringLiteral("c:minorGridlines"));
    }

    saveXmlAxisEG_AxShared_Title(writer, axis); // "c:title" CT_Title

    writer.writeEmptyElement(QStringLiteral("c:crossAx")); // crossAx (mandatory value)
    writer.writeAttribute(QStringLiteral("val"), QString::number(axis->crossAx));
}

void ChartPrivate::saveXmlAxisEG_AxShared_Title(QXmlStreamWriter &writer, XlsxAxis *axis) const
{
    // CT_Title

    /*
    <xsd:complexType name="CT_Title">
        <xsd:sequence>
            <xsd:element name="tx" type="CT_Tx" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="layout" type="CT_Layout" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="overlay" type="CT_Boolean" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="spPr" type="a:CT_ShapeProperties" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="txPr" type="a:CT_TextBody" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
    */
    /*
    <xsd:complexType name="CT_Tx">
        <xsd:sequence>
            <xsd:choice minOccurs="1" maxOccurs="1">
                <xsd:element name="strRef" type="CT_StrRef" minOccurs="1" maxOccurs="1"/>
                <xsd:element name="rich" type="a:CT_TextBody" minOccurs="1" maxOccurs="1"/>
            </xsd:choice>
        </xsd:sequence>
    </xsd:complexType>
    */
    /*
    <xsd:complexType name="CT_StrRef">
        <xsd:sequence>
            <xsd:element name="f" type="xsd:string" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="strCache" type="CT_StrData" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="extLst" type="CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
    */
    /*
    <xsd:complexType name="CT_TextBody">
        <xsd:sequence>
            <xsd:element name="bodyPr" type="CT_TextBodyProperties" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="lstStyle" type="CT_TextListStyle" minOccurs="0" maxOccurs="1"/>
            <xsd:element name="p" type="CT_TextParagraph" minOccurs="1" maxOccurs="unbounded"/>
        </xsd:sequence>
    </xsd:complexType>
    */

    writer.writeStartElement(QStringLiteral("c:title"));

    // CT_Tx {{
    writer.writeStartElement(QStringLiteral("c:tx"));

    writer.writeStartElement(QStringLiteral("c:rich")); // CT_TextBody

    writer.writeEmptyElement(QStringLiteral("a:bodyPr")); // CT_TextBodyProperties

    writer.writeEmptyElement(QStringLiteral("a:lstStyle")); // CT_TextListStyle

    writer.writeStartElement(QStringLiteral("a:p"));

    writer.writeStartElement(QStringLiteral("a:pPr"));
    writer.writeAttribute(QStringLiteral("lvl"), QString::number(0));

    writer.writeStartElement(QStringLiteral("a:defRPr"));
    writer.writeAttribute(QStringLiteral("b"), QString::number(0));
    writer.writeEndElement(); // a:defRPr
    writer.writeEndElement(); // a:pPr

    writer.writeStartElement(QStringLiteral("a:r"));
    QString strAxisName = GetAxisName(axis);
    writer.writeTextElement(QStringLiteral("a:t"), strAxisName);
    writer.writeEndElement(); // a:r

    writer.writeEndElement(); // a:p

    writer.writeEndElement(); // c:rich

    writer.writeEndElement(); // c:tx
    // CT_Tx }}

    writer.writeStartElement(QStringLiteral("c:overlay"));
    writer.writeAttribute(QStringLiteral("val"), QString::number(0)); // CT_Boolean
    writer.writeEndElement();                                         // c:overlay

    writer.writeEndElement(); // c:title
}

QString ChartPrivate::GetAxisPosString(XlsxAxis::AxisPos axisPos) const
{
    QString pos;
    switch (axisPos) {
    case XlsxAxis::Top:
        pos = QStringLiteral("t");
        break;
    case XlsxAxis::Bottom:
        pos = QStringLiteral("b");
        break;
    case XlsxAxis::Left:
        pos = QStringLiteral("l");
        break;
    case XlsxAxis::Right:
        pos = QStringLiteral("r");
        break;
    default:
        break; // ??
    }

    return pos;
}

QString ChartPrivate::GetAxisName(XlsxAxis *axis) const
{
    QString strAxisName;
    if (nullptr == axis)
        return strAxisName;

    QString pos = GetAxisPosString(axis->axisPos); // l, t, r, b
    if (pos.isEmpty())
        return strAxisName;

    strAxisName = axis->axisNames[axis->axisPos];
    return strAxisName;
}

///
/// \brief ChartPrivate::readSubTree
/// \param reader
/// \return
///
QString ChartPrivate::readSubTree(QXmlStreamReader &reader)
{
    QString treeString;
    QString prefix;
    const auto &treeName = reader.name();

    while (!reader.atEnd()) {
        reader.readNextStartElement();
        if (reader.tokenType() == QXmlStreamReader::StartElement) {
            prefix = reader.prefix().toString();

            treeString += QLatin1String("<") + reader.qualifiedName().toString();

            const QXmlStreamAttributes attributes = reader.attributes();
            for (const QXmlStreamAttribute &attr : attributes) {
                treeString += QLatin1String(" ") + attr.name().toString() + QLatin1String("=\"") +
                              attr.value().toString() + QLatin1String("\"");
            }
            treeString += QStringLiteral(">");
        } else if (reader.tokenType() == QXmlStreamReader::EndElement) {
            if (reader.name() == treeName) {
                break;
            }
            treeString +=
                QLatin1String("</") + reader.qualifiedName().toString() + QLatin1String(">");
        }
    }

    return treeString;
}

///
/// \brief ChartPrivate::loadXmlChartLegend
/// \param reader
/// \return
///
bool ChartPrivate::loadXmlChartLegend(QXmlStreamReader &reader)
{

    Q_ASSERT(reader.name() == QLatin1String("legend"));

    while (!reader.atEnd() && !(reader.tokenType() == QXmlStreamReader::EndElement &&
                                reader.name() == QLatin1String("legend"))) {
        if (reader.readNextStartElement()) {
            if (reader.name() == QLatin1String("legendPos")) // c:legendPos
            {
                QString pos = reader.attributes().value(QLatin1String("val")).toString();
                if (pos.compare(QLatin1String("r"), Qt::CaseInsensitive) == 0) {
                    // legendPos = Chart::ChartAxisPos::Right;
                    legendPos = Chart::Right;
                } else if (pos.compare(QLatin1String("l"), Qt::CaseInsensitive) == 0) {
                    // legendPos = Chart::ChartAxisPos::Left;
                    legendPos = Chart::Left;
                } else if (pos.compare(QLatin1String("t"), Qt::CaseInsensitive) == 0) {
                    // legendPos = Chart::ChartAxisPos::Top;
                    legendPos = Chart::Top;
                } else if (pos.compare(QLatin1String("b"), Qt::CaseInsensitive) == 0) {
                    // legendPos = Chart::ChartAxisPos::Bottom;
                    legendPos = Chart::Bottom;
                } else {
                    // legendPos = Chart::ChartAxisPos::None;
                    legendPos = Chart::None;
                }
            } else if (reader.name() == QLatin1String("overlay")) // c:legendPos
            {
                QString pos = reader.attributes().value(QLatin1String("val")).toString();
                if (pos.compare(QLatin1String("1"), Qt::CaseInsensitive) == 0) {
                    legendOverlay = true;
                } else {
                    legendOverlay = false;
                }
            }
        }
    }

    return false;
}

QT_END_NAMESPACE_XLSX
