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#include "qcupsprintersupport_p.h"

#include "qcupsprintengine_p.h"
#include <private/qprinterinfo_p.h>

#include <QtPrintSupport/QPrinterInfo>

#include <cups/ppd.h>
#ifndef QT_LINUXBASE // LSB merges everything into cups.h
# include <cups/language.h>
#endif

QT_BEGIN_NAMESPACE

QCupsPrinterSupport::QCupsPrinterSupport() : QPlatformPrinterSupport(),
                                             m_cups(QLatin1String("cups"), 2),
                                             m_cupsPrinters(0),
                                             m_cupsPrintersCount(0)
{
    loadCups();
    loadCupsPrinters();
}

QCupsPrinterSupport::~QCupsPrinterSupport()
{
    if (cupsFreeDests)
        cupsFreeDests(m_cupsPrintersCount, m_cupsPrinters);
}

QPrintEngine *QCupsPrinterSupport::createNativePrintEngine(QPrinter::PrinterMode printerMode)
{
    return new QCupsPrintEngine(printerMode);
}

QPaintEngine *QCupsPrinterSupport::createPaintEngine(QPrintEngine *engine, QPrinter::PrinterMode printerMode)
{
    Q_UNUSED(printerMode)
    return static_cast<QCupsPrintEngine *>(engine);
}

QList<QPrinter::PaperSize> QCupsPrinterSupport::supportedPaperSizes(const QPrinterInfo &printerInfo) const
{
    return QCUPSSupport::getCupsPrinterPaperSizes(printerIndex(printerInfo));
}

void QCupsPrinterSupport::loadCups()
{
    cupsGetDests = (CupsGetDests) m_cups.resolve("cupsGetDests");
    cupsFreeDests = (CupsFreeDests) m_cups.resolve("cupsFreeDests");
    cupsGetOption = (CupsGetOption) m_cups.resolve("cupsGetOption");
}

void QCupsPrinterSupport::loadCupsPrinters()
{
    m_cupsPrintersCount = 0;
    m_printers.clear();

    if (cupsFreeDests)
        cupsFreeDests(m_cupsPrintersCount, m_cupsPrinters);

    if (cupsGetDests)
        m_cupsPrintersCount = cupsGetDests(&m_cupsPrinters);

    for (int i = 0; i < m_cupsPrintersCount; ++i) {
        QString printerName = QString::fromLocal8Bit(m_cupsPrinters[i].name);
        if (m_cupsPrinters[i].instance)
            printerName += QLatin1Char('/') + QString::fromLocal8Bit(m_cupsPrinters[i].instance);
        QString description = cupsOption(i, "printer-info");
        QString location = cupsOption(i, "printer-location");
        QString makeAndModel = cupsOption(i, "printer-make-and-model");
        QPrinterInfo printer = createPrinterInfo(printerName, description, location, makeAndModel,
                                                 m_cupsPrinters[i].is_default, i);
        m_printers.append(printer);
    }
}

QString QCupsPrinterSupport::printerOption(const QPrinterInfo &printer, const QString &key) const
{
    return cupsOption(printerIndex(printer), key);
}

QString QCupsPrinterSupport::cupsOption(int i, const QString &key) const
{
    QString value;
    if (i > -1 && i < m_cupsPrintersCount && cupsGetOption)
        value = cupsGetOption(key.toLocal8Bit(), m_cupsPrinters[i].num_options, m_cupsPrinters[i].options);
    return value;
}

PrinterOptions QCupsPrinterSupport::printerOptions(const QPrinterInfo &printer) const
{
    PrinterOptions options;
    int p = printerIndex(printer);
    if (p <= -1 || p >= m_cupsPrintersCount)
        return options;
    int numOptions = m_cupsPrinters[p].num_options;
    for (int i = 0; i < numOptions; ++i) {
        QString name = m_cupsPrinters[p].options[i].name;
        QString value = m_cupsPrinters[p].options[i].value;
        options.insert(name, value);
    }
    return options;
}

QT_END_NAMESPACE