/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

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****************************************************************************/

#include <QtCore/QDir>

#include <QtCore/QtDebug>

#include <QtCore/QFile>

#include <QtCore/QFileInfo>

#include <QtCore/QStringList>

#include <QtCore/QTextCodec>

#include <QtCore/QTextStream>

#include <QtCore/QUrl>

#include <QtCore/QVariant>

#include <QtCore/QVector>

#include <QtCore/QCoreApplication>

#include <QtXmlPatterns/QXmlFormatter>

#include <QtXmlPatterns/QXmlItem>

#include <QtXmlPatterns/QXmlQuery>

#include <QtXmlPatterns/QXmlSerializer>

#include "private/qautoptr_p.h"

#include "qapplicationargument_p.h"

#include "qapplicationargumentparser_p.h"

#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE)

/* Needed for opening stdout with _fdopen & friends. io.h seems to not be

 * needed on MinGW though. */

#include <io.h>

#include <fcntl.h>

#endif

#include "main.h"

QT_USE_NAMESPACE

/* The two Q_DECLARE_METATYPE macros must appear before the code

 * on a couple of HPUX platforms. */

/*!

 \internal

 \since 4.4

 Represents the name and value found in "-param name=value".

 */

typedef QPair<QString, QString> Parameter;

Q_DECLARE_METATYPE(Parameter)

/*!

 \internal

 \since 4.4

 For the -output switch.

 */

Q_DECLARE_METATYPE(QIODevice *)

/*!

 \class PatternistApplicationParser

 \brief Subclass to handle -param name=value

 \internal

 \since 4.4

 \reentrant

 */

class PatternistApplicationParser : public QApplicationArgumentParser

{

public:

    inline PatternistApplicationParser(int argc, char **argv,

                                       const QXmlNamePool &np) : QApplicationArgumentParser(argc, argv)

                                                               , m_namePool(np)

#ifdef Q_OS_WIN

                                                               , m_stdout(0)

#endif

    {

    }

#ifdef Q_OS_WIN

    virtual ~PatternistApplicationParser()

    {

        /* QFile::~QFile() nor QFile::close() frees the handle when

         * we use QFile::open() so we have to do it manually.

         *

         * "If stream is NULL, the invalid parameter handler is invoked," so

         * lets try to avoid that. */

        if(m_stdout)

            fclose(m_stdout);

    }

#endif

protected:

    virtual QVariant convertToValue(const QApplicationArgument &arg,

                                    const QString &input) const

    {

        if(arg.name() == QLatin1String("param"))

        {

            const int assign = input.indexOf(QLatin1Char('='));

            if(assign == -1)

            {

                message(QXmlPatternistCLI::tr("Each binding must contain an equal sign."));

                return QVariant();

            }

            const QString name(input.left(assign));

            const QString value(input.mid(assign + 1));

            if(!QXmlName::isNCName(name))

            {

                message(QXmlPatternistCLI::tr("The variable name must be a valid NCName, which %1 isn't.").arg(name));

                return QVariant();

            }

            /* The value.isNull() check ensures we can bind variables whose value is an empty string. */

            return qVariantFromValue(Parameter(name, value.isNull() ? QString(QLatin1String("")) : value ));

        }

        else if(arg.name() == QLatin1String("output"))

        {

            QFile *const f = new QFile(input);

            if(f->open(QIODevice::WriteOnly))

                return qVariantFromValue(static_cast<QIODevice *>(f));

            else

            {

                message(QXmlPatternistCLI::tr("Failed to open file %1 for writing: %2").arg(f->fileName(), f->errorString()));

                return QVariant();

            }

        }

        else if(arg.name() == QLatin1String("initial-template"))

        {

            const QXmlName name(QXmlName::fromClarkName(input, m_namePool));

            if(name.isNull())

            {

                message(QXmlPatternistCLI::tr("%1 is an invalid Clark Name").arg(input));

                return QVariant();

            }

            else

                return qVariantFromValue(name);

        }

        else

            return QApplicationArgumentParser::convertToValue(arg, input);

    }

    virtual QString typeToName(const QApplicationArgument &argument) const

    {

        if(argument.name() == QLatin1String("param"))

            return QLatin1String("name=value");

        else if(argument.name() == QLatin1String("output"))

            return QLatin1String("local file");

        else

            return QApplicationArgumentParser::typeToName(argument);

    }

    virtual QVariant defaultValue(const QApplicationArgument &argument) const

    {

        if(argument.name() == QLatin1String("output"))

        {

            QFile *const out = new QFile();

#ifdef Q_OS_WIN

            /* If we don't open stdout in "binary" mode on Windows, it will translate

             * 0xA into 0xD 0xA. */

            _setmode(_fileno(stdout), _O_BINARY);

            m_stdout = _wfdopen(_fileno(stdout), L"wb");

            out->open(m_stdout, QIODevice::WriteOnly);

#else

            out->open(stdout, QIODevice::WriteOnly);

#endif

            return qVariantFromValue(static_cast<QIODevice *>(out));

        }

        else

            return QApplicationArgumentParser::defaultValue(argument);

    }

private:

    QXmlNamePool    m_namePool;

#ifdef Q_OS_WIN

    mutable FILE *  m_stdout;

#endif

};

static inline QUrl finalizeURI(const QApplicationArgumentParser &parser,

                               const QApplicationArgument &isURI,

                               const QApplicationArgument &arg)

{

    QUrl userURI;

    {

        const QString stringURI(parser.value(arg).toString());

        if(parser.has(isURI))

            userURI = QUrl::fromEncoded(stringURI.toLatin1());

        else

            userURI = QUrl::fromLocalFile(stringURI);

    }

    return QUrl::fromLocalFile(QDir::current().absolutePath() + QLatin1Char('/')).resolved(userURI);

}

int main(int argc, char **argv)

{

    enum ExitCode

    {

        /**

         * We start from 2, because QApplicationArgumentParser

         * uses 1.

         */

        QueryFailure = 2,

        StdOutFailure

    };

    const QCoreApplication app(argc, argv);

    QCoreApplication::setApplicationName(QLatin1String("xmlpatterns"));

    QXmlNamePool namePool;

    PatternistApplicationParser parser(argc, argv, namePool);

    parser.setApplicationDescription(QLatin1String("A tool for running XQuery queries."));

    parser.setApplicationVersion(QLatin1String("0.1"));

    QApplicationArgument param(QLatin1String("param"),

                               QXmlPatternistCLI::tr("Binds an external variable. The value is directly available using the variable reference: $name."),

                               qMetaTypeId<Parameter>());

    param.setMaximumOccurrence(-1);

    parser.addArgument(param);

    const QApplicationArgument noformat(QLatin1String("no-format"),

                                        QXmlPatternistCLI::tr("By default output is formatted for readability. When specified, strict serialization is performed."));

    parser.addArgument(noformat);

    const QApplicationArgument isURI(QLatin1String("is-uri"),

                                     QXmlPatternistCLI::tr("If specified, all filenames on the command line are interpreted as URIs instead of a local filenames."));

    parser.addArgument(isURI);

    const QApplicationArgument initialTemplateName(QLatin1String("initial-template"),

                                                   QXmlPatternistCLI::tr("The name of the initial template to call as a Clark Name."),

                                                   QVariant::String);

    parser.addArgument(initialTemplateName);

    /* The temporary object is required to compile with g++ 3.3. */

    QApplicationArgument queryURI = QApplicationArgument(QLatin1String("query/stylesheet"),

                                                         QXmlPatternistCLI::tr("A local filename pointing to the query to run. If the name ends with .xsl it's assumed "

                                                                               "to be an XSL-T stylesheet. If it ends with .xq, it's assumed to be an XQuery query. (In "

                                                                               "other cases it's also assumed to be an XQuery query, but that interpretation may "

                                                                               "change in a future release of Qt.)"),

                                                         QVariant::String);

    queryURI.setMinimumOccurrence(1);

    queryURI.setNameless(true);

    parser.addArgument(queryURI);

    QApplicationArgument focus = QApplicationArgument(QLatin1String("focus"),

                                                      QXmlPatternistCLI::tr("The document to use as focus. Mandatory "

                                                                            "in case a stylesheet is used. This option is "

                                                                            "also affected by the is-uris option."),

                                                      QVariant::String);

    focus.setMinimumOccurrence(0);

    focus.setNameless(true);

    parser.addArgument(focus);

    QApplicationArgument output(QLatin1String("output"),

                                QXmlPatternistCLI::tr("A local file to which the output should be written. "

                                                      "The file is overwritten, or if not exist, created. "

                                                      "If absent, stdout is used."),

                                qMetaTypeId<QIODevice *>());

    parser.addArgument(output);

    if(!parser.parse())

        return parser.exitCode();

    /* Get the query URI. */

    const QUrl effectiveURI(finalizeURI(parser, isURI, queryURI));

    QXmlQuery::QueryLanguage lang;

    if(effectiveURI.toString().endsWith(QLatin1String(".xsl")))

         lang = QXmlQuery::XSLT20;

    else

         lang = QXmlQuery::XQuery10;

    if(lang == QXmlQuery::XQuery10 && parser.has(initialTemplateName))

    {

        parser.message(QXmlPatternistCLI::tr("An initial template name cannot be specified when running an XQuery."));

        return QApplicationArgumentParser::ParseError;

    }

    QXmlQuery query(lang, namePool);

    query.setInitialTemplateName(qVariantValue<QXmlName>(parser.value(initialTemplateName)));

    /* Bind external variables. */

    {

        const QVariantList parameters(parser.values(param));

        const int len = parameters.count();

        /* For tracking duplicates. */

        QSet<QString> usedParameters;

        for(int i = 0; i < len; ++i)

        {

            const Parameter p(qVariantValue<Parameter>(parameters.at(i)));

            if(usedParameters.contains(p.first))

            {

                parser.message(QXmlPatternistCLI::tr("Each parameter must be unique, %1 is specified at least twice.").arg(p.first));

                return QApplicationArgumentParser::ParseError;

            }

            else

            {

                usedParameters.insert(p.first);

                query.bindVariable(p.first, QXmlItem(p.second));

            }

        }

    }

    if(parser.has(focus))

    {

        if(!query.setFocus(finalizeURI(parser, isURI, focus)))

            return QueryFailure;

    }

    else if(lang == QXmlQuery::XSLT20 && !parser.has(initialTemplateName))

    {

        parser.message(QXmlPatternistCLI::tr("When a stylesheet is used, a "

                                             "document must be specified as a focus, or an "

                                             "initial template name must be specified, or both."));

        return QApplicationArgumentParser::ParseError;

    }

    query.setQuery(effectiveURI);

    const QPatternist::AutoPtr<QIODevice> outDevice(qVariantValue<QIODevice *>(parser.value(output)));

    Q_ASSERT(outDevice);

    Q_ASSERT(outDevice->isWritable());

    if(query.isValid())

    {

        typedef QPatternist::AutoPtr<QAbstractXmlReceiver> RecPtr;

        RecPtr receiver;

        if(parser.has(noformat))

            receiver = RecPtr(new QXmlSerializer(query, outDevice.data()));

        else

            receiver = RecPtr(new QXmlFormatter(query, outDevice.data()));

        const bool success = query.evaluateTo(receiver.data());

        if(success)

            return parser.exitCode();

        else

            return QueryFailure;

    }

    else

        return QueryFailure;

}