// xlsxworkbook.cpp

#include <QtGlobal>
#include <QXmlStreamWriter>
#include <QXmlStreamReader>
#include <QFile>
#include <QBuffer>
#include <QDir>
#include <QtDebug>

#include "xlsxworkbook.h"
#include "xlsxworkbook_p.h"
#include "xlsxsharedstrings_p.h"
#include "xlsxworksheet.h"
#include "xlsxchartsheet.h"
#include "xlsxstyles_p.h"
#include "xlsxformat.h"
#include "xlsxworksheet_p.h"
#include "xlsxformat_p.h"
#include "xlsxmediafile_p.h"
#include "xlsxutility_p.h"
#include "xlsxchart.h"

QT_BEGIN_NAMESPACE_XLSX

WorkbookPrivate::WorkbookPrivate(Workbook *q, Workbook::CreateFlag flag) :
    AbstractOOXmlFilePrivate(q, flag)
{
    sharedStrings = QSharedPointer<SharedStrings> (new SharedStrings(flag));
    styles = QSharedPointer<Styles>(new Styles(flag));
    theme = QSharedPointer<Theme>(new Theme(flag));

    x_window = 240;
    y_window = 15;
    window_width = 16095;
    window_height = 9660;

    strings_to_numbers_enabled = false;
    strings_to_hyperlinks_enabled = true;
    html_to_richstring_enabled = false;
    date1904 = false;
    defaultDateFormat = QStringLiteral("yyyy-mm-dd");
    activesheetIndex = 0;
    firstsheet = 0;
    table_count = 0;

    last_worksheet_index = 0;
    last_chartsheet_index = 0;
    last_sheet_id = 0;
}

Workbook::Workbook(CreateFlag flag)
    : AbstractOOXmlFile(new WorkbookPrivate(this, flag))
{

}

Workbook::~Workbook()
{
}

bool Workbook::isDate1904() const
{
    Q_D(const Workbook);
    return d->date1904;
}

/*!
  Excel for Windows uses a default epoch of 1900 and Excel
  for Mac uses an epoch of 1904. However, Excel on either
  platform will convert automatically between one system
  and the other. Qt Xlsx stores dates in the 1900 format
  by default.

  \note This function should be called before any date/time
  has been written.
*/
void Workbook::setDate1904(bool date1904)
{
    Q_D(Workbook);
    d->date1904 = date1904;
}

/*
  Enable the worksheet.write() method to convert strings
  to numbers, where possible, using float() in order to avoid
  an Excel warning about "Numbers Stored as Text".

  The default is false
 */
void Workbook::setStringsToNumbersEnabled(bool enable)
{
    Q_D(Workbook);
    d->strings_to_numbers_enabled = enable;
}

bool Workbook::isStringsToNumbersEnabled() const
{
    Q_D(const Workbook);
    return d->strings_to_numbers_enabled;
}

void Workbook::setStringsToHyperlinksEnabled(bool enable)
{
    Q_D(Workbook);
    d->strings_to_hyperlinks_enabled = enable;
}

bool Workbook::isStringsToHyperlinksEnabled() const
{
    Q_D(const Workbook);
    return d->strings_to_hyperlinks_enabled;
}

void Workbook::setHtmlToRichStringEnabled(bool enable)
{
    Q_D(Workbook);
    d->html_to_richstring_enabled = enable;
}

bool Workbook::isHtmlToRichStringEnabled() const
{
    Q_D(const Workbook);
    return d->html_to_richstring_enabled;
}

QString Workbook::defaultDateFormat() const
{
    Q_D(const Workbook);
    return d->defaultDateFormat;
}

void Workbook::setDefaultDateFormat(const QString &format)
{
    Q_D(Workbook);
    d->defaultDateFormat = format;
}

/*!
 * \brief Create a defined name in the workbook.
 * \param name The defined name
 * \param formula The cell or range that the defined name refers to.
 * \param comment
 * \param scope The name of one worksheet, or empty which means golbal scope.
 * \return Return false if the name invalid.
 */
bool Workbook::defineName(const QString &name, const QString &formula, const QString &comment, const QString &scope)
{
    Q_D(Workbook);

    //Remove the = sign from the formula if it exists.
    QString formulaString = formula;
    if (formulaString.startsWith(QLatin1Char('=')))
        formulaString = formula.mid(1);

    int id=-1;
    if (!scope.isEmpty()) {
        for (int i=0; i<d->sheets.size(); ++i) {
            if (d->sheets[i]->sheetName() == scope) {
                id = d->sheets[i]->sheetId();
                break;
            }
        }
    }

    d->definedNamesList.append(XlsxDefineNameData(name, formulaString, comment, id));
    return true;
}

AbstractSheet *Workbook::addSheet(const QString &name, AbstractSheet::SheetType type)
{
    Q_D(Workbook);
    return insertSheet(d->sheets.size(), name, type);
}

/*!
 * \internal
 */
QStringList Workbook::worksheetNames() const
{
    Q_D(const Workbook);
    return d->sheetNames;
}

/*!
 * \internal
 * Used only when load the xlsx file!!
 */
AbstractSheet *Workbook::addSheet(const QString &name, int sheetId, AbstractSheet::SheetType type)
{
    Q_D(Workbook);
    if (sheetId > d->last_sheet_id)
        d->last_sheet_id = sheetId;

    AbstractSheet *sheet = NULL;
    if (type == AbstractSheet::ST_WorkSheet)
    {
        // create work sheet (value sheet)
        sheet = new Worksheet(name, sheetId, this, F_LoadFromExists);
    }
    else if (type == AbstractSheet::ST_ChartSheet)
    {
        // create chart sheet
        sheet = new Chartsheet(name, sheetId, this, F_LoadFromExists);
    }
    else
    {
        qWarning("unsupported sheet type.");
        Q_ASSERT(false);
    }

    d->sheets.append(QSharedPointer<AbstractSheet>(sheet));
    d->sheetNames.append(name);

    return sheet;
}

AbstractSheet *Workbook::insertSheet(int index, const QString &name, AbstractSheet::SheetType type)
{
    Q_D(Workbook);
    QString sheetName = createSafeSheetName(name);
    if(index > d->last_sheet_id){
        //User tries to insert, where no sheet has gone before.
        return 0;
    }
    if (!sheetName.isEmpty()) {
        //If user given an already in-used name, we should not continue any more!
        if (d->sheetNames.contains(sheetName))
            return 0;
    } else {
        if (type == AbstractSheet::ST_WorkSheet) {
            do {
                ++d->last_worksheet_index;
                sheetName = QStringLiteral("Sheet%1").arg(d->last_worksheet_index);
            } while (d->sheetNames.contains(sheetName));
        } else if (type == AbstractSheet::ST_ChartSheet) {
            do {
                ++d->last_chartsheet_index;
                sheetName = QStringLiteral("Chart%1").arg(d->last_chartsheet_index);
            } while (d->sheetNames.contains(sheetName));
        } else {
            qWarning("unsupported sheet type.");
            return 0;
        }
    }

    ++d->last_sheet_id;

    AbstractSheet *sheet = NULL;
    if ( type == AbstractSheet::ST_WorkSheet )
    {
        sheet = new Worksheet(sheetName, d->last_sheet_id, this, F_NewFromScratch);
    }
    else if ( type == AbstractSheet::ST_ChartSheet )
    {
        sheet = new Chartsheet(sheetName, d->last_sheet_id, this, F_NewFromScratch);
    }
    else
    {
        qWarning("unsupported sheet type.");
        Q_ASSERT(false);
    }

    d->sheets.insert(index, QSharedPointer<AbstractSheet>(sheet));
    d->sheetNames.insert(index, sheetName);
    d->activesheetIndex = index;

    return sheet;
}

/*!
 * Returns current active worksheet.
 */
AbstractSheet *Workbook::activeSheet() const
{
    Q_D(const Workbook);
    if (d->sheets.isEmpty())
        const_cast<Workbook*>(this)->addSheet();
    return d->sheets[d->activesheetIndex].data();
}

bool Workbook::setActiveSheet(int index)
{
    Q_D(Workbook);
    if (index < 0 || index >= d->sheets.size()) {
        //warning
        return false;
    }
    d->activesheetIndex = index;
    return true;
}

/*!
 * Rename the worksheet at the \a index to \a newName.
 */
bool Workbook::renameSheet(int index, const QString &newName)
{
    Q_D(Workbook);
    QString name = createSafeSheetName(newName);
    if (index < 0 || index >= d->sheets.size())
        return false;

    //If user given an already in-used name, return false
    for (int i=0; i<d->sheets.size(); ++i) {
        if (d->sheets[i]->sheetName() == name)
            return false;
    }

    d->sheets[index]->setSheetName(name);
    d->sheetNames[index] = name;
    return true;
}

/*!
 * Remove the worksheet at pos \a index.
 */
bool Workbook::deleteSheet(int index)
{
    Q_D(Workbook);
    if (d->sheets.size() <= 1)
        return false;
    if (index < 0 || index >= d->sheets.size())
        return false;
    d->sheets.removeAt(index);
    d->sheetNames.removeAt(index);
    return true;
}

/*!
 * Moves the worksheet form \a srcIndex to \a distIndex.
 */
bool Workbook::moveSheet(int srcIndex, int distIndex)
{
    Q_D(Workbook);
    if (srcIndex == distIndex)
        return false;

    if (srcIndex < 0 || srcIndex >= d->sheets.size())
        return false;

    QSharedPointer<AbstractSheet> sheet = d->sheets.takeAt(srcIndex);
    d->sheetNames.takeAt(srcIndex);
    if (distIndex >= 0 || distIndex <= d->sheets.size()) {
        d->sheets.insert(distIndex, sheet);
        d->sheetNames.insert(distIndex, sheet->sheetName());
    } else {
        d->sheets.append(sheet);
        d->sheetNames.append(sheet->sheetName());
    }
    return true;
}

bool Workbook::copySheet(int index, const QString &newName)
{
    Q_D(Workbook);
    if (index < 0 || index >= d->sheets.size())
        return false;

    QString worksheetName = createSafeSheetName(newName);
    if (!newName.isEmpty()) {
        //If user given an already in-used name, we should not continue any more!
        if (d->sheetNames.contains(newName))
            return false;
    } else {
        int copy_index = 1;
        do {
            ++copy_index;
            worksheetName = QStringLiteral("%1(%2)").arg(d->sheets[index]->sheetName()).arg(copy_index);
        } while (d->sheetNames.contains(worksheetName));
    }

    ++d->last_sheet_id;
    AbstractSheet *sheet = d->sheets[index]->copy(worksheetName, d->last_sheet_id);
    d->sheets.append(QSharedPointer<AbstractSheet> (sheet));
    d->sheetNames.append(sheet->sheetName());

    return false;
}

/*!
 * Returns count of worksheets.
 */
int Workbook::sheetCount() const
{
    Q_D(const Workbook);
    return d->sheets.count();
}

/*!
 * Returns the sheet object at index \a sheetIndex.
 */
AbstractSheet *Workbook::sheet(int index) const
{
    Q_D(const Workbook);
    if (index < 0 || index >= d->sheets.size())
        return 0;
    return d->sheets.at(index).data();
}

SharedStrings *Workbook::sharedStrings() const
{
    Q_D(const Workbook);
    return d->sharedStrings.data();
}

Styles *Workbook::styles()
{
    Q_D(Workbook);
    return d->styles.data();
}

Theme *Workbook::theme()
{
    Q_D(Workbook);
    return d->theme.data();
}

/*!
 * \internal
 *
 * Unlike media files, drawing file is a property of the sheet.
 */
QList<Drawing *> Workbook::drawings()
{
    Q_D(Workbook);
    QList<Drawing *> ds;
    for (int i=0; i<d->sheets.size(); ++i) {
        QSharedPointer<AbstractSheet> sheet = d->sheets[i];
        if (sheet->drawing())
        ds.append(sheet->drawing());
    }

    return ds;
}

/*!
 * \internal
 */
QList<QSharedPointer<AbstractSheet> > Workbook::getSheetsByTypes(AbstractSheet::SheetType type) const
{
    Q_D(const Workbook);
    QList<QSharedPointer<AbstractSheet> > list;
    for (int i=0; i<d->sheets.size(); ++i) {
        if (d->sheets[i]->sheetType() == type)
            list.append(d->sheets[i]);
    }
    return list;
}

void Workbook::saveToXmlFile(QIODevice *device) const
{
    Q_D(const Workbook);
    d->relationships->clear();
    if (d->sheets.isEmpty())
        const_cast<Workbook *>(this)->addSheet();

    QXmlStreamWriter writer(device);

    writer.writeStartDocument(QStringLiteral("1.0"), true);
    writer.writeStartElement(QStringLiteral("workbook"));
    writer.writeAttribute(QStringLiteral("xmlns"), QStringLiteral("http://schemas.openxmlformats.org/spreadsheetml/2006/main"));
    writer.writeAttribute(QStringLiteral("xmlns:r"), QStringLiteral("http://schemas.openxmlformats.org/officeDocument/2006/relationships"));

    writer.writeEmptyElement(QStringLiteral("fileVersion"));
    writer.writeAttribute(QStringLiteral("appName"), QStringLiteral("xl"));
    writer.writeAttribute(QStringLiteral("lastEdited"), QStringLiteral("4"));
    writer.writeAttribute(QStringLiteral("lowestEdited"), QStringLiteral("4"));
    writer.writeAttribute(QStringLiteral("rupBuild"), QStringLiteral("4505"));
//    writer.writeAttribute(QStringLiteral("codeName"), QStringLiteral("{37E998C4-C9E5-D4B9-71C8-EB1FF731991C}"));

    writer.writeEmptyElement(QStringLiteral("workbookPr"));
    if (d->date1904)
        writer.writeAttribute(QStringLiteral("date1904"), QStringLiteral("1"));
    writer.writeAttribute(QStringLiteral("defaultThemeVersion"), QStringLiteral("124226"));

    writer.writeStartElement(QStringLiteral("bookViews"));
    writer.writeEmptyElement(QStringLiteral("workbookView"));
    writer.writeAttribute(QStringLiteral("xWindow"), QString::number(d->x_window));
    writer.writeAttribute(QStringLiteral("yWindow"), QString::number(d->y_window));
    writer.writeAttribute(QStringLiteral("windowWidth"), QString::number(d->window_width));
    writer.writeAttribute(QStringLiteral("windowHeight"), QString::number(d->window_height));
    //Store the firstSheet when it isn't the default
    //For example, when "the first sheet 0 is hidden", the first sheet will be 1
    if (d->firstsheet > 0)
        writer.writeAttribute(QStringLiteral("firstSheet"), QString::number(d->firstsheet + 1));
    //Store the activeTab when it isn't the first sheet
    if (d->activesheetIndex > 0)
        writer.writeAttribute(QStringLiteral("activeTab"), QString::number(d->activesheetIndex));
    writer.writeEndElement();//bookViews

    writer.writeStartElement(QStringLiteral("sheets"));
    int worksheetIndex = 0;
    int chartsheetIndex = 0;
    for (int i=0; i<d->sheets.size(); ++i) {
        QSharedPointer<AbstractSheet> sheet = d->sheets[i];
        writer.writeEmptyElement(QStringLiteral("sheet"));
        writer.writeAttribute(QStringLiteral("name"), sheet->sheetName());
        writer.writeAttribute(QStringLiteral("sheetId"), QString::number(sheet->sheetId()));
        if (sheet->sheetState() == AbstractSheet::SS_Hidden)
            writer.writeAttribute(QStringLiteral("state"), QStringLiteral("hidden"));
        else if (sheet->sheetState() == AbstractSheet::SS_VeryHidden)
            writer.writeAttribute(QStringLiteral("state"), QStringLiteral("veryHidden"));

        if (sheet->sheetType() == AbstractSheet::ST_WorkSheet)
            d->relationships->addDocumentRelationship(QStringLiteral("/worksheet"), QStringLiteral("worksheets/sheet%1.xml").arg(++worksheetIndex));
        else
            d->relationships->addDocumentRelationship(QStringLiteral("/chartsheet"), QStringLiteral("chartsheets/sheet%1.xml").arg(++chartsheetIndex));

        writer.writeAttribute(QStringLiteral("r:id"), QStringLiteral("rId%1").arg(d->relationships->count()));
    }
    writer.writeEndElement();//sheets

    if (d->externalLinks.size() > 0) {
        writer.writeStartElement(QStringLiteral("externalReferences"));
        for (int i=0; i<d->externalLinks.size(); ++i) {
            writer.writeEmptyElement(QStringLiteral("externalReference"));
            d->relationships->addDocumentRelationship(QStringLiteral("/externalLink"), QStringLiteral("externalLinks/externalLink%1.xml").arg(i+1));
            writer.writeAttribute(QStringLiteral("r:id"), QStringLiteral("rId%1").arg(d->relationships->count()));
        }
        writer.writeEndElement();//externalReferences
    }

    if (!d->definedNamesList.isEmpty()) {
        writer.writeStartElement(QStringLiteral("definedNames"));
        for (const XlsxDefineNameData &data : d->definedNamesList) {
            writer.writeStartElement(QStringLiteral("definedName"));
            writer.writeAttribute(QStringLiteral("name"), data.name);
            if (!data.comment.isEmpty())
                writer.writeAttribute(QStringLiteral("comment"), data.comment);
            if (data.sheetId != -1) {
                //find the local index of the sheet.
                for (int i=0; i<d->sheets.size(); ++i) {
                    if (d->sheets[i]->sheetId() == data.sheetId) {
                        writer.writeAttribute(QStringLiteral("localSheetId"), QString::number(i));
                        break;
                    }
                }
            }
            writer.writeCharacters(data.formula);
            writer.writeEndElement();//definedName
        }
        writer.writeEndElement();//definedNames
    }

    writer.writeStartElement(QStringLiteral("calcPr"));
    writer.writeAttribute(QStringLiteral("calcId"), QStringLiteral("124519"));
    writer.writeEndElement(); //calcPr

    writer.writeEndElement();//workbook
    writer.writeEndDocument();

    d->relationships->addDocumentRelationship(QStringLiteral("/theme"), QStringLiteral("theme/theme1.xml"));
    d->relationships->addDocumentRelationship(QStringLiteral("/styles"), QStringLiteral("styles.xml"));
    if (!sharedStrings()->isEmpty())
        d->relationships->addDocumentRelationship(QStringLiteral("/sharedStrings"), QStringLiteral("sharedStrings.xml"));
}

bool Workbook::loadFromXmlFile(QIODevice *device)
{
    Q_D(Workbook);

    QXmlStreamReader reader(device);
    while (!reader.atEnd())
    {
         QXmlStreamReader::TokenType token = reader.readNext();
         if (token == QXmlStreamReader::StartElement)
         {
             if (reader.name() == QLatin1String("sheet"))
             {
                 QXmlStreamAttributes attributes = reader.attributes();

                 const auto& name = attributes.value(QLatin1String("name")).toString();

                 int sheetId = attributes.value(QLatin1String("sheetId")).toString().toInt();

                 const auto& rId = attributes.value(QLatin1String("r:id")).toString();

                 const auto& stateString = attributes.value(QLatin1String("state"));

                 AbstractSheet::SheetState state = AbstractSheet::SS_Visible;
                 if (stateString == QLatin1String("hidden"))
                     state = AbstractSheet::SS_Hidden;
                 else if (stateString == QLatin1String("veryHidden"))
                     state = AbstractSheet::SS_VeryHidden;

                 XlsxRelationship relationship = d->relationships->getRelationshipById(rId);

                 AbstractSheet::SheetType type = AbstractSheet::ST_WorkSheet;
                 if (relationship.type.endsWith(QLatin1String("/worksheet")))
                 {
                     type = AbstractSheet::ST_WorkSheet;
                 }
                 else if (relationship.type.endsWith(QLatin1String("/chartsheet")))
                 {
                     type = AbstractSheet::ST_ChartSheet;
                 }
                 else if (relationship.type.endsWith(QLatin1String("/dialogsheet")))
                 {
                     type = AbstractSheet::ST_DialogSheet;
                 }
                 else if (relationship.type.endsWith(QLatin1String("/xlMacrosheet")))
                 {
                     type = AbstractSheet::ST_MacroSheet;
                 }
                 else
                 {
                     qWarning() << "unknown sheet type : " << relationship.type ;
                 }

                 AbstractSheet *sheet = addSheet(name, sheetId, type);
                 sheet->setSheetState(state);
                 QString strFilePath = filePath();

                 // const QString fullPath = QDir::cleanPath(splitPath(strFilePath).constFirst() + QLatin1String("/") + relationship.target);
                 QString str = *( splitPath(strFilePath).begin() );
                 str = str + QLatin1String("/");
                 str = str + relationship.target;
                 const QString fullPath = QDir::cleanPath( str );

                 sheet->setFilePath(fullPath);
             }
             else if (reader.name() == QLatin1String("workbookPr"))
             {
                QXmlStreamAttributes attrs = reader.attributes();
                if (attrs.hasAttribute(QLatin1String("date1904")))
                    d->date1904 = true;
             }
             else if (reader.name() == QLatin1String("bookviews"))
             {
                while (!(reader.name() == QLatin1String("bookviews") &&
                         reader.tokenType() == QXmlStreamReader::EndElement))
                {
                    reader.readNextStartElement();
                    if (reader.tokenType() == QXmlStreamReader::StartElement)
                    {
                        if (reader.name() == QLatin1String("workbookView"))
                        {
                            QXmlStreamAttributes attrs = reader.attributes();
                            if (attrs.hasAttribute(QLatin1String("xWindow")))
                                d->x_window = attrs.value(QLatin1String("xWindow")).toString().toInt();
                            if (attrs.hasAttribute(QLatin1String("yWindow")))
                                d->y_window = attrs.value(QLatin1String("yWindow")).toString().toInt();
                            if (attrs.hasAttribute(QLatin1String("windowWidth")))
                                d->window_width = attrs.value(QLatin1String("windowWidth")).toString().toInt();
                            if (attrs.hasAttribute(QLatin1String("windowHeight")))
                                d->window_height = attrs.value(QLatin1String("windowHeight")).toString().toInt();
                            if (attrs.hasAttribute(QLatin1String("firstSheet")))
                                d->firstsheet = attrs.value(QLatin1String("firstSheet")).toString().toInt();
                            if (attrs.hasAttribute(QLatin1String("activeTab")))
                                d->activesheetIndex = attrs.value(QLatin1String("activeTab")).toString().toInt();
                        }
                    }
                }
             }
             else if (reader.name() == QLatin1String("externalReference"))
             {
                 QXmlStreamAttributes attributes = reader.attributes();
                 const QString rId = attributes.value(QLatin1String("r:id")).toString();
                 XlsxRelationship relationship = d->relationships->getRelationshipById(rId);

                 QSharedPointer<SimpleOOXmlFile> link(new SimpleOOXmlFile(F_LoadFromExists));

                 QString str = *( splitPath(filePath()).begin() );
                 str = str + QLatin1String("/");
                 str = str + relationship.target;
                 const QString fullPath = QDir::cleanPath( str );

                 link->setFilePath(fullPath);
                 d->externalLinks.append(link);
             } else if (reader.name() == QLatin1String("definedName")) {
                 QXmlStreamAttributes attrs = reader.attributes();
                 XlsxDefineNameData data;

                 data.name = attrs.value(QLatin1String("name")).toString();
                 if (attrs.hasAttribute(QLatin1String("comment")))
                     data.comment = attrs.value(QLatin1String("comment")).toString();
                 if (attrs.hasAttribute(QLatin1String("localSheetId"))) {
                     int localId = attrs.value(QLatin1String("localSheetId")).toString().toInt();
                     int sheetId = d->sheets.at(localId)->sheetId();
                     data.sheetId = sheetId;
                 }
                 data.formula = reader.readElementText();
                 d->definedNamesList.append(data);
             }
         }
    }
    return true;
}

/*!
 * \internal
 */
QList<QSharedPointer<MediaFile> > Workbook::mediaFiles() const
{
    Q_D(const Workbook);

    return d->mediaFiles;
}

/*!
 * \internal
 */
void Workbook::addMediaFile(QSharedPointer<MediaFile> media, bool force)
{
    Q_D(Workbook);

    if (!force)
    {
        for (int i=0; i<d->mediaFiles.size(); ++i)
        {
            if (d->mediaFiles[i]->hashKey() == media->hashKey())
            {
                media->setIndex(i);
                return;
            }
        }
    }

    media->setIndex(d->mediaFiles.size());
    d->mediaFiles.append(media);
}

/*!
 * \internal
 */
QList<QSharedPointer<Chart> > Workbook::chartFiles() const
{
    Q_D(const Workbook);

    return d->chartFiles;
}

/*!
 * \internal
 */
void Workbook::addChartFile(QSharedPointer<Chart> chart)
{
    Q_D(Workbook);

    if (!d->chartFiles.contains(chart))
        d->chartFiles.append(chart);
}

QT_END_NAMESPACE_XLSX
