/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtWidgets>

#include "xbelgenerator.h"

XbelGenerator::XbelGenerator(const QTreeWidget *treeWidget)
    : treeWidget(treeWidget)
{
}

bool XbelGenerator::write(QIODevice *device)
{
    out.setDevice(device);
    out.setCodec("UTF-8");
    out << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
        << "<!DOCTYPE xbel>\n"
        << "<xbel version=\"1.0\">\n";

    for (int i = 0; i < treeWidget->topLevelItemCount(); ++i)
        generateItem(treeWidget->topLevelItem(i), 1);

    out << "</xbel>\n";
    return true;
}

QString XbelGenerator::indent(int depth)
{
    const int IndentSize = 4;
    return QString(IndentSize * depth, ' ');
}

QString XbelGenerator::escapedText(const QString &str)
{
    QString result = str;
    result.replace('&', "&amp;");
    result.replace('<', "&lt;");
    result.replace('>', "&gt;");
    return result;
}

QString XbelGenerator::escapedAttribute(const QString &str)
{
    QString result = escapedText(str);
    result.replace(QLatin1Char('"'), "&quot;");
    result.prepend(QLatin1Char('"'));
    result.append(QLatin1Char('"'));
    return result;
}

void XbelGenerator::generateItem(const QTreeWidgetItem *item, int depth)
{
    QString tagName = item->data(0, Qt::UserRole).toString();
    if (tagName == QLatin1String("folder")) {
        bool folded = !item->isExpanded();
        out << indent(depth) << "<folder folded=\"" << (folded ? "yes" : "no")
                             << "\">\n"
            << indent(depth + 1) << "<title>" << escapedText(item->text(0))
                                 << "</title>\n";

        for (int i = 0; i < item->childCount(); ++i)
            generateItem(item->child(i), depth + 1);

        out << indent(depth) << "</folder>\n";
    } else if (tagName == QLatin1String("bookmark")) {
        out << indent(depth) << "<bookmark";
        if (!item->text(1).isEmpty())
            out << " href=" << escapedAttribute(item->text(1));
        out << ">\n"
            << indent(depth + 1) << "<title>" << escapedText(item->text(0))
                                 << "</title>\n"
            << indent(depth) << "</bookmark>\n";
    } else if (tagName == QLatin1String("separator")) {
        out << indent(depth) << "<separator/>\n";
    }
}