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#include <QtGui>

#include <QtXmlPatterns>

#include "querymainwindow.h"

#include "xmlsyntaxhighlighter.h"

//! [0]

QueryMainWindow::QueryMainWindow() : ui_defaultQueries(0)

{

    setupUi(this);

    new XmlSyntaxHighlighter(qFindChild<QTextEdit*>(this, "inputTextEdit")->document());

    new XmlSyntaxHighlighter(qFindChild<QTextEdit*>(this, "outputTextEdit")->document());

    ui_defaultQueries = qFindChild<QComboBox*>(this, "defaultQueries");

    QMetaObject::connectSlotsByName(this);

    connect(ui_defaultQueries, SIGNAL(currentIndexChanged(int)), SLOT(displayQuery(int)));

    loadInputFile();

    const QStringList queries(QDir(":/files/", "*.xq").entryList());

    int len = queries.count();

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

        ui_defaultQueries->addItem(queries.at(i));

}

//! [0]

//! [1]

void QueryMainWindow::displayQuery(int index)

{

    QFile queryFile(QString(":files/") + ui_defaultQueries->itemText(index));

    queryFile.open(QIODevice::ReadOnly);

    const QString query(QString::fromLatin1(queryFile.readAll()));

    qFindChild<QTextEdit*>(this, "queryTextEdit")->setPlainText(query);

    evaluate(query);

}

//! [1]

void QueryMainWindow::loadInputFile()

{

    QFile forView;

    forView.setFileName(":/files/cookbook.xml");

    if (!forView.open(QIODevice::ReadOnly)) {

        QMessageBox::information(this,

            tr("Unable to open file"), forView.errorString());

        return;

    }

    QTextStream in(&forView);

    QString inputDocument = in.readAll();

    qFindChild<QTextEdit*>(this, "inputTextEdit")->setPlainText(inputDocument);

}

//! [2]

void QueryMainWindow::evaluate(const QString &str)

{

    QFile sourceDocument;

    sourceDocument.setFileName(":/files/cookbook.xml");

    sourceDocument.open(QIODevice::ReadOnly);

    QByteArray outArray;

    QBuffer buffer(&outArray);

    buffer.open(QIODevice::ReadWrite);

    QXmlQuery query;

    query.bindVariable("inputDocument", &sourceDocument);

    query.setQuery(str);

    if (!query.isValid())

        return;

    QXmlFormatter formatter(query, &buffer);

    if (!query.evaluateTo(&formatter))

        return;

    buffer.close();

    qFindChild<QTextEdit*>(this, "outputTextEdit")->setPlainText(QString::fromUtf8(outArray.constData()));

}

//! [2]