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#include <qdebug.h>

#include "qcups_p.h"

#ifndef QT_NO_CUPS

#ifndef QT_LINUXBASE // LSB merges everything into cups.h

# include <cups/language.h>

#endif

#include <qtextcodec.h>

QT_BEGIN_NAMESPACE

typedef int (*CupsGetDests)(cups_dest_t **dests);

typedef void (*CupsFreeDests)(int num_dests, cups_dest_t *dests);

typedef const char* (*CupsGetPPD)(const char *printer);

typedef int (*CupsMarkOptions)(ppd_file_t *ppd, int num_options, cups_option_t *options);

typedef ppd_file_t* (*PPDOpenFile)(const char *filename);

typedef void (*PPDMarkDefaults)(ppd_file_t *ppd);

typedef int (*PPDMarkOption)(ppd_file_t *ppd, const char *keyword, const char *option);

typedef void (*PPDClose)(ppd_file_t *ppd);

typedef int (*PPDMarkOption)(ppd_file_t *ppd, const char *keyword, const char *option);

typedef void (*CupsFreeOptions)(int num_options, cups_option_t *options);

typedef void (*CupsSetDests)(int num_dests, cups_dest_t *dests);

typedef cups_lang_t* (*CupsLangGet)(const char *language);

typedef const char* (*CupsLangEncoding)(cups_lang_t *language);

typedef int (*CupsAddOption)(const char *name, const char *value, int num_options, cups_option_t **options);

typedef int (*CupsTempFd)(char *name, int len);

typedef int (*CupsPrintFile)(const char * name, const char * filename, const char * title, int num_options, cups_option_t * options);

static bool cupsLoaded = false;

static int qt_cups_num_printers = 0;

static CupsGetDests _cupsGetDests = 0;

static CupsFreeDests _cupsFreeDests = 0;

static CupsGetPPD _cupsGetPPD = 0;

static PPDOpenFile _ppdOpenFile = 0;

static PPDMarkDefaults _ppdMarkDefaults = 0;

static PPDClose _ppdClose = 0;

static CupsMarkOptions _cupsMarkOptions = 0;

static PPDMarkOption _ppdMarkOption = 0;

static CupsFreeOptions _cupsFreeOptions = 0;

static CupsSetDests _cupsSetDests = 0;

static CupsLangGet _cupsLangGet = 0;

static CupsLangEncoding _cupsLangEncoding = 0;

static CupsAddOption _cupsAddOption = 0;

static CupsTempFd _cupsTempFd = 0;

static CupsPrintFile _cupsPrintFile = 0;

static void resolveCups()

{

    QLibrary cupsLib(QLatin1String("cups"), 2);

    if(cupsLib.load()) {

        _cupsGetDests = (CupsGetDests) cupsLib.resolve("cupsGetDests");

        _cupsFreeDests = (CupsFreeDests) cupsLib.resolve("cupsFreeDests");

        _cupsGetPPD = (CupsGetPPD) cupsLib.resolve("cupsGetPPD");

        _cupsLangGet = (CupsLangGet) cupsLib.resolve("cupsLangGet");

        _cupsLangEncoding = (CupsLangEncoding) cupsLib.resolve("cupsLangEncoding");

        _ppdOpenFile = (PPDOpenFile) cupsLib.resolve("ppdOpenFile");

        _ppdMarkDefaults = (PPDMarkDefaults) cupsLib.resolve("ppdMarkDefaults");

        _ppdClose = (PPDClose) cupsLib.resolve("ppdClose");

        _cupsMarkOptions = (CupsMarkOptions) cupsLib.resolve("cupsMarkOptions");

        _ppdMarkOption = (PPDMarkOption) cupsLib.resolve("ppdMarkOption");

        _cupsFreeOptions = (CupsFreeOptions) cupsLib.resolve("cupsFreeOptions");

        _cupsSetDests = (CupsSetDests) cupsLib.resolve("cupsSetDests");

        _cupsAddOption = (CupsAddOption) cupsLib.resolve("cupsAddOption");

        _cupsTempFd = (CupsTempFd) cupsLib.resolve("cupsTempFd");

        _cupsPrintFile = (CupsPrintFile) cupsLib.resolve("cupsPrintFile");

        if (_cupsGetDests && _cupsFreeDests) {

            cups_dest_t *printers;

            int num_printers = _cupsGetDests(&printers);

            if (num_printers)

                _cupsFreeDests(num_printers, printers);

            qt_cups_num_printers = num_printers;

        }

    }

    cupsLoaded = true;

}

// ================ CUPS Support class ========================

QCUPSSupport::QCUPSSupport()

    :

    prnCount(0),

    printers(0),

    page_sizes(0),

    currPrinterIndex(0),

    currPPD(0)

{

    if (!cupsLoaded)

        resolveCups();

    // getting all available printers

    if (!isAvailable())

        return;

    prnCount = _cupsGetDests(&printers);

    for (int i = 0; i <  prnCount; ++i) {

        if (printers[i].is_default) {

            currPrinterIndex = i;

            setCurrentPrinter(i);

            break;

        }

    }

#ifndef QT_NO_TEXTCODEC

    cups_lang_t *cupsLang = _cupsLangGet(0);

    codec = QTextCodec::codecForName(_cupsLangEncoding(cupsLang));

    if (!codec)

        codec = QTextCodec::codecForLocale();

#endif

}

QCUPSSupport::~QCUPSSupport()

{

     if (currPPD)

        _ppdClose(currPPD);

     if (prnCount)

         _cupsFreeDests(prnCount, printers);

}

int QCUPSSupport::availablePrintersCount() const

{

    return prnCount;

}

const cups_dest_t* QCUPSSupport::availablePrinters() const

{

    return printers;

}

const ppd_file_t* QCUPSSupport::currentPPD() const

{

    return currPPD;

}

const ppd_file_t* QCUPSSupport::setCurrentPrinter(int index)

{

    Q_ASSERT(index >= 0 && index <= prnCount);

    if (index == prnCount)

        return 0;

    currPrinterIndex = index;

    if (currPPD)

        _ppdClose(currPPD);

    currPPD = 0;

    page_sizes = 0;

    const char *ppdFile = _cupsGetPPD(printers[index].name);

    if (!ppdFile)

      return 0;

    currPPD = _ppdOpenFile(ppdFile);

    unlink(ppdFile);

    // marking default options

    _ppdMarkDefaults(currPPD);

    // marking options explicitly set

    _cupsMarkOptions(currPPD, printers[currPrinterIndex].num_options, printers[currPrinterIndex].options);

    // getting pointer to page sizes

    page_sizes = ppdOption("PageSize");

    return currPPD;

}

int QCUPSSupport::currentPrinterIndex() const

{

    return currPrinterIndex;

}

bool QCUPSSupport::isAvailable()

{

    if(!cupsLoaded)

        resolveCups();

    return _cupsGetDests &&

        _cupsFreeDests &&

        _cupsGetPPD &&

        _ppdOpenFile &&

        _ppdMarkDefaults &&

        _ppdClose &&

        _cupsMarkOptions &&

        _ppdMarkOption &&

        _cupsFreeOptions &&

        _cupsSetDests &&

        _cupsLangGet &&

        _cupsLangEncoding &&

        _cupsAddOption &&

        (qt_cups_num_printers > 0);

}

const ppd_option_t* QCUPSSupport::ppdOption(const char *key) const

{

    if (currPPD) {

        for (int gr = 0; gr < currPPD->num_groups; ++gr) {

            for (int opt = 0; opt < currPPD->groups[gr].num_options; ++opt) {

                if (qstrcmp(currPPD->groups[gr].options[opt].keyword, key) == 0)

                    return &currPPD->groups[gr].options[opt];

            }

        }

    }

    return 0;

}

const cups_option_t* QCUPSSupport::printerOption(const QString &key) const

{

    for (int i = 0; i < printers[currPrinterIndex].num_options; ++i) {

        if (QLatin1String(printers[currPrinterIndex].options[i].name) == key)

            return &printers[currPrinterIndex].options[i];

    }

    return 0;

}

const ppd_option_t* QCUPSSupport::pageSizes() const

{

    return page_sizes;

}

int QCUPSSupport::markOption(const char* name, const char* value)

{

    return _ppdMarkOption(currPPD, name, value);

}

void QCUPSSupport::saveOptions(QList<const ppd_option_t*> options, QList<const char*> markedOptions)

{

    int oldOptionCount = printers[currPrinterIndex].num_options;

    cups_option_t* oldOptions = printers[currPrinterIndex].options;

    int newOptionCount = 0;

    cups_option_t* newOptions = 0;

    // copying old options that are not on the new list

    for (int i = 0; i < oldOptionCount; ++i) {

        bool contains = false;

        for (int j = 0; j < options.count(); ++j) {

            if (qstrcmp(options.at(j)->keyword, oldOptions[i].name) == 0) {

                contains = true;

                break;

            }

        }

        if (!contains) {

            newOptionCount = _cupsAddOption(oldOptions[i].name, oldOptions[i].value, newOptionCount, &newOptions);

        }

    }

    // we can release old option list

     _cupsFreeOptions(oldOptionCount, oldOptions);

    // adding marked options

    for (int i = 0; i < markedOptions.count(); ++i) {

        const char* name = markedOptions.at(i);

        ++i;

        newOptionCount = _cupsAddOption(name, markedOptions.at(i), newOptionCount, &newOptions);

    }

    // placing the new option list

    printers[currPrinterIndex].num_options = newOptionCount;

    printers[currPrinterIndex].options = newOptions;

    // saving new default values

    _cupsSetDests(prnCount, printers);

}

QRect QCUPSSupport::paperRect(const char *choice) const

{

    if (!currPPD)

        return QRect();

    for (int i = 0; i < currPPD->num_sizes; ++i) {

        if (qstrcmp(currPPD->sizes[i].name, choice) == 0)

            return QRect(0, 0, qRound(currPPD->sizes[i].width), qRound(currPPD->sizes[i].length));

    }

    return QRect();

}

QRect QCUPSSupport::pageRect(const char *choice) const

{

    if (!currPPD)

        return QRect();

    for (int i = 0; i < currPPD->num_sizes; ++i) {

        if (qstrcmp(currPPD->sizes[i].name, choice) == 0)

            return QRect(qRound(currPPD->sizes[i].left),

                         qRound(currPPD->sizes[i].length - currPPD->sizes[i].top),

                         qRound(currPPD->sizes[i].right - currPPD->sizes[i].left),

                         qRound(currPPD->sizes[i].top - currPPD->sizes[i].bottom));

    }

    return QRect();

}

QStringList QCUPSSupport::options() const

{

    QStringList list;

    collectMarkedOptions(list);

    return list;

}

bool QCUPSSupport::printerHasPPD(const char *printerName)

{

    if (!isAvailable())

        return false;

    return _cupsGetPPD(printerName) != 0;

}

QString QCUPSSupport::unicodeString(const char *s)

{

#ifndef QT_NO_TEXTCODEC

    return codec->toUnicode(s);

#else

    return QLatin1String(s);

#endif

}

void QCUPSSupport::collectMarkedOptions(QStringList& list, const ppd_group_t* group) const

{

    if (group == 0) {

        if (!currPPD)

            return;

        for (int i = 0; i < currPPD->num_groups; ++i) {

            collectMarkedOptions(list, &currPPD->groups[i]);

            collectMarkedOptionsHelper(list, &currPPD->groups[i]);

        }

    } else {

        for (int i = 0; i < group->num_subgroups; ++i)

            collectMarkedOptionsHelper(list, &group->subgroups[i]);

    }

}

void QCUPSSupport::collectMarkedOptionsHelper(QStringList& list, const ppd_group_t* group) const

{

    for (int i = 0; i < group->num_options; ++i) {

        for (int j = 0; j < group->options[i].num_choices; ++j) {

            if (group->options[i].choices[j].marked == 1 && qstrcmp(group->options[i].choices[j].choice, group->options[i].defchoice) != 0)

                list << QString::fromLocal8Bit(group->options[i].keyword) << QString::fromLocal8Bit(group->options[i].choices[j].choice);

        }

    }

}

QPair<int, QString> QCUPSSupport::tempFd()

{

    char filename[512];

    int fd = _cupsTempFd(filename, 512);

    return QPair<int, QString>(fd, QString::fromLocal8Bit(filename));

}

// Prints the given file and returns a job id.

int QCUPSSupport::printFile(const char * printerName, const char * filename, const char * title,

                            int num_options, cups_option_t * options)

{

    return _cupsPrintFile(printerName, filename, title, num_options, options);

}

QT_END_NAMESPACE

#endif // QT_NO_CUPS