// Web page to pdf
// Needs qt6-base, qt6-webengine

#include <QApplication>
#include <QCommandLineParser>
#include <QFile>
#include <QTextStream>
#include <QWebEngineView>
#include <QWebEngineProfile>
#include <QWebEngineSettings>
#include <QMarginsF>
#include <QPageLayout>
#include <QPageSize>

#include <functional>
#include <utility>

//User Agent iphone18 Chrome 141
const char* AgentIphone = "Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_2 "
    "like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) "
    "CriOS/141.0.73393.39 Mobile/15E148 Safari/604.1";

//User Agent Win10 firefox 143
const char* AgentWin10 = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; "
    "rv:143.0) Gecko/20100101 Firefox/143.0";

/*** Set User Agent, Scripts, Images, Font Size, Paper size here ***/
//Set User agent
const char* agent = AgentIphone;

//Set javascript and images on/off, font size
const bool js = false;
const bool im = true;
const int fs = 18;

//Paper sizes
//Letter 216×279, Legal 216×356, Ledger 279×432, Tabloid 432×279
//A4 210x297, A3 297x420, A2 420x594, A1 594x841

//Set Paper size, margins
const QPageLayout layout(
    //QPageSize(QPageSize::Letter), QPageLayout::Portrait,
    //QPageSize(QPageSize::Ledger), QPageLayout::Portrait,
    QPageSize(QPageSize::Tabloid), QPageLayout::Portrait,
    QMarginsF(0, 2, 0, 2), //(left, top, right, bottom)
    QPageLayout::Millimeter
);
/************************* End of Settings *************************/

class Html2PdfConverter : public QObject {
    Q_OBJECT
public:
    explicit Html2PdfConverter(QString inputPath, QString outputPath);
    int run();

private slots:
    void loadFinished(bool ok);
    void pdfPrintingFinished(const QString &filePath, bool success);

private:
    QString m_inputPath;
    QString m_outputPath;
    QScopedPointer<QWebEngineView> m_view;
};

Html2PdfConverter::Html2PdfConverter(QString inputPath, QString outputPath)
    : m_inputPath(std::move(inputPath))
    , m_outputPath(std::move(outputPath))
    , m_view(new QWebEngineView) {
    connect(m_view.data(), &QWebEngineView::loadFinished,
            this, &Html2PdfConverter::loadFinished);
    connect(m_view.data(), &QWebEngineView::pdfPrintingFinished,
            this, &Html2PdfConverter::pdfPrintingFinished);
}

int Html2PdfConverter::run() {
    m_view->load(QUrl::fromUserInput(m_inputPath));
    return QApplication::exec();
}

void Html2PdfConverter::loadFinished(bool ok) {
    if (!ok) {
        QTextStream(stderr)
            << tr("failed to load URL '%1'").arg(m_inputPath) << "\n";
        QCoreApplication::exit(1);
        return;
    }

    m_view->printToPdf(m_outputPath, layout);
}

void Html2PdfConverter::pdfPrintingFinished(const QString &filePath, bool success) {
    if (!success) {
        QTextStream(stderr)
            << tr("failed to print to output file '%1'").arg(filePath) << "\n";
        QCoreApplication::exit(1);
    } else {
        QCoreApplication::quit();
    }
}

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    QCoreApplication::setOrganizationName("web2pdf6");
    QCoreApplication::setApplicationName("html2pdf6");
    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
    
    QWebEngineProfile::defaultProfile()->settings()->setAttribute(QWebEngineSettings::JavascriptEnabled, js);
    QWebEngineProfile::defaultProfile()->settings()->setAttribute(QWebEngineSettings::AutoLoadImages, im);
    QWebEngineProfile::defaultProfile()->settings()->setFontSize(QWebEngineSettings::DefaultFontSize, fs);
    QWebEngineProfile::defaultProfile()->settings()->setFontFamily(QWebEngineSettings::StandardFont, "monospace");
    QWebEngineProfile::defaultProfile()->setHttpUserAgent(agent);

    QCommandLineParser parser;
    parser.setApplicationDescription(
        QCoreApplication::translate("main", "Converts the web page INPUT into the PDF file OUTPUT."));
    parser.addHelpOption();
    parser.addVersionOption();
    parser.addPositionalArgument(
        QCoreApplication::translate("main", "INPUT"),
        QCoreApplication::translate("main", "Input URL for PDF conversion."));
    parser.addPositionalArgument(
        QCoreApplication::translate("main", "OUTPUT"),
        QCoreApplication::translate("main", "Output file name for PDF conversion."));

    parser.process(QCoreApplication::arguments());

    const QStringList requiredArguments = parser.positionalArguments();
    if (requiredArguments.size() != 2)
        parser.showHelp(1);

    Html2PdfConverter converter(requiredArguments.at(0), requiredArguments.at(1));
    return converter.run();
}

#include "html2pdf.moc"

TEMPLATE = app

QT += webenginewidgets

SOURCES += html2pdf.cpp

target.path = $$[QT_INSTALL_EXAMPLES]/webenginewidgets/html2pdf
INSTALLS += target