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#include "qt3to4.h"

#include <QApplication>

#include <QDir>

#include <QFile>

#include <QHash>

#include <QLibraryInfo>

#include <QXmlDefaultHandler>

#include <QXmlSimpleReader>

QT_BEGIN_NAMESPACE

class ContentHandler: public QXmlDefaultHandler

{

public:

    typedef QPair<QString, QString> Rule;

    typedef QList<Rule> RuleList;

public:

    ContentHandler() {}

    inline RuleList renamedHeaders() const

    { return rules(QString::fromLatin1("RenamedHeader")); }

    inline RuleList renamedClasses() const

    { return rules(QString::fromLatin1("RenamedClass")); }

    inline RuleList renamedEnums() const

    { return rules(QString::fromLatin1("RenamedEnumvalue")); }

    inline RuleList rules(const QString &kind) const

    { return m_rules.value(kind); }

    virtual bool startDocument()

    {

        m_rules.clear();

        m_state.current.clear();

        m_state.kind.clear();

        m_state.q3.clear();

        m_state.q4.clear();

        return true;

    }

    virtual bool startElement(const QString &, const QString &, const QString &qName, const QXmlAttributes &attrs)

    {

        if (qName == QLatin1String("item")) {

            m_state.kind = attrs.value(QLatin1String("Type"));

            m_state.current.clear();

            m_state.q3.clear();

            m_state.q4.clear();

            if (!m_rules.contains(m_state.kind))

                m_rules[m_state.kind].clear();

            return true;

        }

        return true; // ### only if it is a valid tag

    }

    virtual bool endElement(const QString &, const QString &, const QString &qName)

    {

        if (qName == QLatin1String("Qt3")) {

            m_state.q3 = m_state.current.trimmed();

        } else if (qName == QLatin1String("Qt4")) {

            m_state.q4 = m_state.current.trimmed();

        } else if (qName == QLatin1String("item")

                   && (m_state.kind == QLatin1String("RenamedHeader")

                       || m_state.kind == QLatin1String("RenamedEnumvalue")

                       || m_state.kind == QLatin1String("RenamedClass"))) {

            Rule r(m_state.q3, m_state.q4);

            m_rules[m_state.kind].append(r);

        }

        m_state.current.clear();

        return true;

    }

    virtual bool characters(const QString &ch)

    { m_state.current += ch; return true; }

    virtual bool error(const QXmlParseException &e)

    { Q_UNUSED(e); Q_ASSERT(0); return true; }

    virtual bool fatalError(const QXmlParseException &e)

    { Q_UNUSED(e); Q_ASSERT(0); return true; }

    virtual bool warning(const QXmlParseException &e)

    { Q_UNUSED(e); Q_ASSERT(0); return true; }

private:

    QHash<QString, RuleList> m_rules;

    struct state

    {

        QString current;

        QString kind;

        QString q3;

        QString q4;

    } m_state;

};

void Porting::readXML(RuleList *renamedHeaders, RuleList *renamedClasses, RuleList *renamedEnums)

{

    QString fileName = QLatin1String("q3porting.xml");

    QString filePath;

    //check QLibraryInfo::DataPath/filename

    filePath = QDir::cleanPath(QLibraryInfo::location(QLibraryInfo::DataPath) + QLatin1Char('/') + fileName)  ;

    //check QLibraryInfo::PrefixPath/tools/porting/src/filename

    if (!QFile::exists(filePath))

        filePath = QDir::cleanPath(QLibraryInfo::location(QLibraryInfo::PrefixPath) + QLatin1String("/tools/porting/src/") + fileName);

    // for bootstrapping, look in the rules file in a location

    // relative to where it would be in the source tree

    if (!QFile::exists(filePath))

        filePath = QDir::cleanPath(QApplication::instance()->applicationDirPath() + QLatin1String("/../tools/porting/src/") + fileName);

    if (!QFile::exists(filePath)) {

        fprintf(stderr, "Error: Could not find rules file: %s\n", fileName.toLatin1().constData());

        Q_ASSERT(0);

    }

    ContentHandler handler;

    QXmlSimpleReader reader;

    reader.setContentHandler(&handler);

    reader.setErrorHandler(&handler);

    QFile file(filePath);

    file.open(QFile::ReadOnly);

    QXmlInputSource source(file);

    bool ok = reader.parse(&source);

    Q_UNUSED(ok);

    Q_ASSERT(ok);

    if (renamedHeaders)

        *renamedHeaders = handler.renamedHeaders();

    if (renamedClasses)

        *renamedClasses = handler.renamedClasses();

    if (renamedEnums)

        *renamedEnums = handler.renamedEnums();

}

Porting::Porting()

{

    readXML(&m_renamedHeaders, &m_renamedClasses, &m_renamedEnums);

}

int Porting::findRule(const RuleList &rules, const QString &q3)

{

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

        if (rules.at(i).first == q3)

            return i;

    return -1;

}

QString Porting::renameHeader(const QString &headerName) const

{

    int index = findRule(m_renamedHeaders, headerName);

    return index == -1 ? headerName : m_renamedHeaders.at(index).second;

}

QString Porting::renameClass(const QString &className) const

{

    if (className == QLatin1String("QSplitter"))  // We don't want a Q3Splitter, ever!

        return className;

    int index = findRule(m_renamedClasses, className);

    return index == -1 ? className : m_renamedClasses.at(index).second;

}

QString Porting::renameEnumerator(const QString &enumName) const

{

    int index = findRule(m_renamedEnums, enumName);

    return index == -1 ? QString() : m_renamedEnums.at(index).second;

}

QT_END_NAMESPACE