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#include "xbel.h"

#include <QtCore/QFile>

BookmarkNode::BookmarkNode(BookmarkNode::Type type, BookmarkNode *parent) :

     expanded(false)

   , m_parent(parent)

   , m_type(type)

{

    if (parent)

        parent->add(this);

}

BookmarkNode::~BookmarkNode()

{

    if (m_parent)

        m_parent->remove(this);

    qDeleteAll(m_children);

    m_parent = 0;

    m_type = BookmarkNode::Root;

}

bool BookmarkNode::operator==(const BookmarkNode &other)

{

    if (url != other.url

        || title != other.title

        || desc != other.desc

        || expanded != other.expanded

        || m_type != other.m_type

        || m_children.count() != other.m_children.count())

        return false;

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

        if (!((*(m_children[i])) == (*(other.m_children[i]))))

            return false;

    return true;

}

BookmarkNode::Type BookmarkNode::type() const

{

    return m_type;

}

void BookmarkNode::setType(Type type)

{

    m_type = type;

}

QList<BookmarkNode *> BookmarkNode::children() const

{

    return m_children;

}

BookmarkNode *BookmarkNode::parent() const

{

    return m_parent;

}

void BookmarkNode::add(BookmarkNode *child, int offset)

{

    Q_ASSERT(child->m_type != Root);

    if (child->m_parent)

        child->m_parent->remove(child);

    child->m_parent = this;

    if (-1 == offset)

        offset = m_children.size();

    m_children.insert(offset, child);

}

void BookmarkNode::remove(BookmarkNode *child)

{

    child->m_parent = 0;

    m_children.removeAll(child);

}

XbelReader::XbelReader()

{

}

BookmarkNode *XbelReader::read(const QString &fileName)

{

    QFile file(fileName);

    if (!file.exists()) {

        return new BookmarkNode(BookmarkNode::Root);

    }

    file.open(QFile::ReadOnly);

    return read(&file);

}

BookmarkNode *XbelReader::read(QIODevice *device)

{

    BookmarkNode *root = new BookmarkNode(BookmarkNode::Root);

    setDevice(device);

    if (readNextStartElement()) {

        QString version = attributes().value(QLatin1String("version")).toString();

        if (name() == QLatin1String("xbel")

            && (version.isEmpty() || version == QLatin1String("1.0"))) {

            readXBEL(root);

        } else {

            raiseError(QObject::tr("The file is not an XBEL version 1.0 file."));

        }

    }

    return root;

}

void XbelReader::readXBEL(BookmarkNode *parent)

{

    Q_ASSERT(isStartElement() && name() == QLatin1String("xbel"));

    while (readNextStartElement()) {

        if (name() == QLatin1String("folder"))

            readFolder(parent);

        else if (name() == QLatin1String("bookmark"))

            readBookmarkNode(parent);

        else if (name() == QLatin1String("separator"))

            readSeparator(parent);

        else

            skipCurrentElement();

    }

}

void XbelReader::readFolder(BookmarkNode *parent)

{

    Q_ASSERT(isStartElement() && name() == QLatin1String("folder"));

    BookmarkNode *folder = new BookmarkNode(BookmarkNode::Folder, parent);

    folder->expanded = (attributes().value(QLatin1String("folded")) == QLatin1String("no"));

    while (readNextStartElement()) {

        if (name() == QLatin1String("title"))

            readTitle(folder);

        else if (name() == QLatin1String("desc"))

            readDescription(folder);

        else if (name() == QLatin1String("folder"))

            readFolder(folder);

        else if (name() == QLatin1String("bookmark"))

            readBookmarkNode(folder);

        else if (name() == QLatin1String("separator"))

            readSeparator(folder);

        else

            skipCurrentElement();

    }

}

void XbelReader::readTitle(BookmarkNode *parent)

{

    Q_ASSERT(isStartElement() && name() == QLatin1String("title"));

    parent->title = readElementText();

}

void XbelReader::readDescription(BookmarkNode *parent)

{

    Q_ASSERT(isStartElement() && name() == QLatin1String("desc"));

    parent->desc = readElementText();

}

void XbelReader::readSeparator(BookmarkNode *parent)

{

    new BookmarkNode(BookmarkNode::Separator, parent);

    // empty elements have a start and end element

    readNext();

}

void XbelReader::readBookmarkNode(BookmarkNode *parent)

{

    Q_ASSERT(isStartElement() && name() == QLatin1String("bookmark"));

    BookmarkNode *bookmark = new BookmarkNode(BookmarkNode::Bookmark, parent);

    bookmark->url = attributes().value(QLatin1String("href")).toString();

    while (readNextStartElement()) {

        if (name() == QLatin1String("title"))

            readTitle(bookmark);

        else if (name() == QLatin1String("desc"))

            readDescription(bookmark);

        else

            skipCurrentElement();

    }

    if (bookmark->title.isEmpty())

        bookmark->title = QObject::tr("Unknown title");

}

XbelWriter::XbelWriter()

{

    setAutoFormatting(true);

}

bool XbelWriter::write(const QString &fileName, const BookmarkNode *root)

{

    QFile file(fileName);

    if (!root || !file.open(QFile::WriteOnly))

        return false;

    return write(&file, root);

}

bool XbelWriter::write(QIODevice *device, const BookmarkNode *root)

{

    setDevice(device);

    writeStartDocument();

    writeDTD(QLatin1String("<!DOCTYPE xbel>"));

    writeStartElement(QLatin1String("xbel"));

    writeAttribute(QLatin1String("version"), QLatin1String("1.0"));

    if (root->type() == BookmarkNode::Root) {

        for (int i = 0; i < root->children().count(); ++i)

            writeItem(root->children().at(i));

    } else {

        writeItem(root);

    }

    writeEndDocument();

    return true;

}

void XbelWriter::writeItem(const BookmarkNode *parent)

{

    switch (parent->type()) {

    case BookmarkNode::Folder:

        writeStartElement(QLatin1String("folder"));

        writeAttribute(QLatin1String("folded"), parent->expanded ? QLatin1String("no") : QLatin1String("yes"));

        writeTextElement(QLatin1String("title"), parent->title);

        for (int i = 0; i < parent->children().count(); ++i)

            writeItem(parent->children().at(i));

        writeEndElement();

        break;

    case BookmarkNode::Bookmark:

        writeStartElement(QLatin1String("bookmark"));

        if (!parent->url.isEmpty())

            writeAttribute(QLatin1String("href"), parent->url);

        writeTextElement(QLatin1String("title"), parent->title);

        if (!parent->desc.isEmpty())

            writeAttribute(QLatin1String("desc"), parent->desc);

        writeEndElement();

        break;

    case BookmarkNode::Separator:

        writeEmptyElement(QLatin1String("separator"));

        break;

    default:

        break;

    }

}