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#include <QtGui>

#include <QtXmlPatterns>

#include "mainwindow.h"

#include "xmlsyntaxhighlighter.h"

//! [4]

class MessageHandler : public QAbstractMessageHandler

{

    public:

        MessageHandler()

            : QAbstractMessageHandler(0)

        {

        }

        QString statusMessage() const

        {

            return m_description;

        }

        int line() const

        {

            return m_sourceLocation.line();

        }

        int column() const

        {

            return m_sourceLocation.column();

        }

    protected:

        virtual void handleMessage(QtMsgType type, const QString &description,

                                   const QUrl &identifier, const QSourceLocation &sourceLocation)

        {

            Q_UNUSED(type);

            Q_UNUSED(identifier);

            m_messageType = type;

            m_description = description;

            m_sourceLocation = sourceLocation;

        }

    private:

        QtMsgType m_messageType;

        QString m_description;

        QSourceLocation m_sourceLocation;

};

//! [4]

//! [0]

MainWindow::MainWindow()

{

    setupUi(this);

    new XmlSyntaxHighlighter(schemaView->document());

    new XmlSyntaxHighlighter(instanceEdit->document());

    schemaSelection->addItem(tr("Contact Schema"));

    schemaSelection->addItem(tr("Recipe Schema"));

    schemaSelection->addItem(tr("Order Schema"));

    instanceSelection->addItem(tr("Valid Contact Instance"));

    instanceSelection->addItem(tr("Invalid Contact Instance"));

    connect(schemaSelection, SIGNAL(currentIndexChanged(int)), SLOT(schemaSelected(int)));

    connect(instanceSelection, SIGNAL(currentIndexChanged(int)), SLOT(instanceSelected(int)));

    connect(validateButton, SIGNAL(clicked()), SLOT(validate()));

    connect(instanceEdit, SIGNAL(textChanged()), SLOT(textChanged()));

    validationStatus->setAlignment(Qt::AlignCenter | Qt::AlignVCenter);

    schemaSelected(0);

    instanceSelected(0);

}

//! [0]

//! [1]

void MainWindow::schemaSelected(int index)

{

    instanceSelection->clear();

    if (index == 0) {

        instanceSelection->addItem(tr("Valid Contact Instance"));

        instanceSelection->addItem(tr("Invalid Contact Instance"));

    } else if (index == 1) {

        instanceSelection->addItem(tr("Valid Recipe Instance"));

        instanceSelection->addItem(tr("Invalid Recipe Instance"));

    } else if (index == 2) {

        instanceSelection->addItem(tr("Valid Order Instance"));

        instanceSelection->addItem(tr("Invalid Order Instance"));

    }

    textChanged();

    QFile schemaFile(QString(":/schema_%1.xsd").arg(index));

    schemaFile.open(QIODevice::ReadOnly);

    const QString schemaText(QString::fromUtf8(schemaFile.readAll()));

    schemaView->setPlainText(schemaText);

    validate();

}

//! [1]

//! [2]

void MainWindow::instanceSelected(int index)

{

    QFile instanceFile(QString(":/instance_%1.xml").arg((2*schemaSelection->currentIndex()) + index));

    instanceFile.open(QIODevice::ReadOnly);

    const QString instanceText(QString::fromUtf8(instanceFile.readAll()));

    instanceEdit->setPlainText(instanceText);

    validate();

}

//! [2]

//! [3]

void MainWindow::validate()

{

    const QByteArray schemaData = schemaView->toPlainText().toUtf8();

    const QByteArray instanceData = instanceEdit->toPlainText().toUtf8();

    MessageHandler messageHandler;

    QXmlSchema schema;

    schema.setMessageHandler(&messageHandler);

    schema.load(schemaData);

    bool errorOccurred = false;

    if (!schema.isValid()) {

        errorOccurred = true;

    } else {

        QXmlSchemaValidator validator(schema);

        if (!validator.validate(instanceData))

            errorOccurred = true;

    }

    if (errorOccurred) {

        validationStatus->setText(messageHandler.statusMessage());

        moveCursor(messageHandler.line(), messageHandler.column());

    } else {

        validationStatus->setText(tr("validation successful"));

    }

    const QString styleSheet = QString("QLabel {background: %1; padding: 3px}")

                                      .arg(errorOccurred ? QColor(Qt::red).lighter(160).name() :

                                                           QColor(Qt::green).lighter(160).name());

    validationStatus->setStyleSheet(styleSheet);

}

//! [3]

void MainWindow::textChanged()

{

    instanceEdit->setExtraSelections(QList<QTextEdit::ExtraSelection>());

}

void MainWindow::moveCursor(int line, int column)

{

    instanceEdit->moveCursor(QTextCursor::Start);

    for (int i = 1; i < line; ++i)

        instanceEdit->moveCursor(QTextCursor::Down);

    for (int i = 1; i < column; ++i)

        instanceEdit->moveCursor(QTextCursor::Right);

    QList<QTextEdit::ExtraSelection> extraSelections;

    QTextEdit::ExtraSelection selection;

    const QColor lineColor = QColor(Qt::red).lighter(160);

    selection.format.setBackground(lineColor);

    selection.format.setProperty(QTextFormat::FullWidthSelection, true);

    selection.cursor = instanceEdit->textCursor();

    selection.cursor.clearSelection();

    extraSelections.append(selection);

    instanceEdit->setExtraSelections(extraSelections);

    instanceEdit->setFocus();

}