// main.cpp

#include <iostream>

#include <QtGlobal>
#include <QObject>
#include <QVector>
#include <QList>

#if QT_VERSION_MAJOR >= 6 // Qt6 or higher version
#include <QtCore5Compat>
#endif

#include "recurse.hpp"

#include "xlsxdocument.h"
#include "xlsxchartsheet.h"
#include "xlsxcellrange.h"
#include "xlsxchart.h"
#include "xlsxrichstring.h"
#include "xlsxworkbook.h"
#include "xlsxabstractsheet.h"
#include "xlsxcelllocation.h"
#include "xlsxcell.h"
using namespace QXlsx;

QString getHtml(QString strFilename);
bool loadXlsx(QString fileName, QString& strHtml);
QString g_htmlDoc;

int main(int argc, char *argv[])
{
    g_htmlDoc = getHtml(":/test.xlsx"); // convert from xlsx to html

    Recurse::Application app(argc, argv);

    app.use([](auto &ctx)
    {
        ctx.response.send(g_htmlDoc);
    });

    quint16 listenPort = 3001; // default port
    auto result = app.listen( listenPort );
    if ( result.error() )
    {
        qDebug() << "error upon listening:" << result.lastError();
        return (-1);
    }
    std::cout << " listening port: " << listenPort << std::endl;

    return 0;
}

QString getHtml(QString strFilename)
{
    QString ret;

    ret = ret + QString("<html>\n");

    ret = ret + QString("<head>\n");
    ret = ret + QString("<title>") + strFilename + QString("</title>\n");
    ret = ret + QString("<meta http-equiv='Content-Type' content='text/html;charset=UTF-8'>\n" );
    ret = ret + QString("</head>\n");

    ret = ret + QString("<body>\n");

    QString strTableStyle = \
        "<style>\n"\
        " table { border-collapse: collapse; } \n"\
        " td, th { border: 1px solid black; } \n"\
        "</style>\n";
    ret = ret + strTableStyle;

    if (!loadXlsx(strFilename, ret))
        return QString("");

    ret = ret + QString("</body>\n");

    ret = ret + QString("</html>\n");

    qDebug() <<  ret << "\n";

    return ret;
}

bool loadXlsx(QString fileName, QString& strHtml)
{
    // tried to load xlsx using temporary document
    QXlsx::Document xlsxTmp( fileName );
    if ( !xlsxTmp.isLoadPackage() )
    {
        return false; // failed to load
    }

    // load new xlsx using new document
    QXlsx::Document xlsxDoc( fileName );
    xlsxDoc.isLoadPackage();

    int sheetIndexNumber = 0;
    foreach( QString curretnSheetName, xlsxDoc.sheetNames() )
    {
        QXlsx::AbstractSheet* currentSheet = xlsxDoc.sheet( curretnSheetName );
        if ( NULL == currentSheet )
            continue;

        // get full cells of sheet
        int maxRow = -1;
        int maxCol = -1;
        currentSheet->workbook()->setActiveSheet( sheetIndexNumber );
        Worksheet* wsheet = (Worksheet*) currentSheet->workbook()->activeSheet();
        if ( NULL == wsheet )
            continue;

        QString strSheetName = wsheet->sheetName(); // sheet name
        strHtml = strHtml + QString("<b>") + strSheetName + QString("</b><br>\n"); // UTF-8

        strHtml = strHtml + QString("<table>");

        QVector<CellLocation> clList = wsheet->getFullCells( &maxRow, &maxCol );

        QVector< QVector<QString> > cellValues;
        for (int rc = 0; rc < maxRow; rc++)
        {
            QVector<QString> tempValue;
            for (int cc = 0; cc < maxCol; cc++)
            {
                tempValue.push_back(QString(""));
            }
            cellValues.push_back(tempValue);
        }

        for ( int ic = 0; ic < clList.size(); ++ic )
         {
            // cell location
            CellLocation cl = clList.at(ic);

            int row = cl.row - 1;
            int col = cl.col - 1;

            QSharedPointer<Cell> ptrCell = cl.cell; // cell pointer

            // value of cell
            QVariant var = cl.cell.data()->value();
            QString str = var.toString();

            cellValues[row][col] = str;
        }

        QString strTableRecord;
        for (int rc = 0; rc < maxRow; rc++)
        {
            strTableRecord = strTableRecord + QString("<tr>");
            for (int cc = 0; cc < maxCol; cc++)
            {
                QString strTemp = cellValues[rc][cc];
                strTableRecord = strTableRecord + QString("<td>");
                strTableRecord = strTableRecord + strTemp; // UTF-8
                strTableRecord = strTableRecord + QString("</td>");
            }
            strTableRecord = strTableRecord + QString("</tr>\n");
        }
        strHtml = strHtml + strTableRecord;

        strHtml = strHtml + QString("</table>\n");

        sheetIndexNumber++;
    }

    return true;
}
