/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the Qt Linguist of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** 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
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
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****************************************************************************/

#include "translator.h"

#include <QtCore/QByteArray>
#include <QtCore/QDebug>
#include <QtCore/QTextCodec>
#include <QtCore/QTextStream>

#include <QtXml/QXmlStreamReader>
#include <QtXml/QXmlStreamAttribute>

QT_BEGIN_NAMESPACE

class QPHReader : public QXmlStreamReader
{
public:
    QPHReader(QIODevice &dev, ConversionData &cd)
      : QXmlStreamReader(&dev), m_cd(cd)
    {}

    // the "real thing"
    bool read(Translator &translator);

private:
    bool elementStarts(const QString &str) const
    {
        return isStartElement() && name() == str;
    }

    bool isWhiteSpace() const
    {
        return isCharacters() && text().toString().trimmed().isEmpty();
    }

    // needed to expand <byte ... />
    QString readContents();
    // needed to join <lengthvariant>s
    QString readTransContents();

    void handleError();

    ConversionData &m_cd;

    enum DataField { NoField, SourceField, TargetField, DefinitionField };
    DataField m_currentField;
    QString m_currentSource;
    QString m_currentTarget;
    QString m_currentDefinition;
};

bool QPHReader::read(Translator &translator)
{
    m_currentField = NoField;
    QString result;
    while (!atEnd()) {
        readNext();
        if (isStartElement()) {
            if (name() == QLatin1String("source"))
                m_currentField = SourceField;
            else if (name() == QLatin1String("target"))
                m_currentField = TargetField;
            else if (name() == QLatin1String("definition"))
                m_currentField = DefinitionField;
            else
                m_currentField = NoField;
        } else if (isWhiteSpace()) {
            // ignore these
        } else if (isCharacters()) {
            if (m_currentField == SourceField)
                m_currentSource += text();
            else if (m_currentField == TargetField)
                m_currentTarget += text();
            else if (m_currentField == DefinitionField)
                m_currentDefinition += text();
        } else if (isEndElement() && name() == QLatin1String("phrase")) {
            TranslatorMessage msg;
            msg.setSourceText(m_currentSource);
            msg.setTranslation(m_currentTarget);
            msg.setTranslatorComment(m_currentDefinition);
            translator.append(msg);
            m_currentSource.clear();
            m_currentTarget.clear();
            m_currentDefinition.clear();
        }
    }
    return true;
}

static bool loadQPH(Translator &translator, QIODevice &dev, ConversionData &cd)
{
    translator.setLocationsType(Translator::NoLocations);
    QPHReader reader(dev, cd);
    return reader.read(translator);
}

static QString protect(const QString &str)
{
    QString result;
    result.reserve(str.length() * 12 / 10);
    for (int i = 0; i != str.size(); ++i) {
        uint c = str.at(i).unicode();
        switch (c) {
        case '\"':
            result += QLatin1String("&quot;");
            break;
        case '&':
            result += QLatin1String("&amp;");
            break;
        case '>':
            result += QLatin1String("&gt;");
            break;
        case '<':
            result += QLatin1String("&lt;");
            break;
        case '\'':
            result += QLatin1String("&apos;");
            break;
        default:
            if (c < 0x20 && c != '\r' && c != '\n' && c != '\t')
                result += QString(QLatin1String("&#%1;")).arg(c);
            else // this also covers surrogates
                result += QChar(c);
        }
    }
    return result;
}

static bool saveQPH(const Translator &translator, QIODevice &dev, ConversionData &)
{
    QTextStream t(&dev);
    t.setCodec(QTextCodec::codecForName("UTF-8"));
    t << "<!DOCTYPE QPH>\n<QPH>\n";
    foreach (const TranslatorMessage &msg, translator.messages()) {
        t << "<phrase>\n";
        t << "    <source>" << protect(msg.sourceText()) << "</source>\n";
        t << "    <target>" << protect(msg.translations().join(QLatin1String("@")))
            << "</target>\n";
        if (!msg.context().isEmpty() || !msg.comment().isEmpty())
            t << "    <definition>" << msg.context() << msg.comment()
                << "</definition>\n";
        t << "</phrase>\n";
    }
    t << "</QPH>\n";
    return true;
}

int initQPH()
{
    Translator::FileFormat format;

    format.extension = QLatin1String("qph");
    format.description = QObject::tr("Qt Linguist 'Phrase Book'");
    format.fileType = Translator::FileFormat::TranslationSource;
    format.priority = 0;
    format.loader = &loadQPH;
    format.saver = &saveQPH;
    Translator::registerFileFormat(format);

    return 1;
}

Q_CONSTRUCTOR_FUNCTION(initQPH)

QT_END_NAMESPACE