/*
    This file is part of the syndication library
    SPDX-FileCopyrightText: 2006 Frank Osterfeld <osterfeld@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#ifndef SYNDICATION_RDF_ITEM_H
#define SYNDICATION_RDF_ITEM_H

#include <syndication/rdf/document.h>
#include <syndication/rdf/resourcewrapper.h>

#include <syndication/specificitem.h>

#include <memory>

class QString;

namespace Syndication
{
class SpecificItemVisitor;

namespace RDF
{
class DublinCore;
class Item;

/**
 * An RSS 1.0 item.
 * (It is a convenience wrapper for the
 * underlying RDF resource, which can be accessed via resource()).
 *
 * @author Frank Osterfeld
 */
class Item : public ResourceWrapper, public SpecificItem
{
public:
    /**
     * creates an item object wrapping a null resource, isNull() is
     * @c true.
     */
    Item();

    /**
     * Creates an item wrapping the given resource
     * @param resource resource to wrap, should be of type
     * of rss1:item, otherwise the wrapper will not return useful
     * information.
     * @param doc the document this item is part of. Used by Document
     */
    explicit Item(ResourcePtr resource, DocumentPtr doc = DocumentPtr());

    /**
     * copies an item
     *
     * @param other item to copy
     */
    Item(const Item &other);

    /**
     * virtual destructor
     */
    ~Item() override;

    /**
     * assigns another item
     *
     * @param other the item to assign
     */
    Item &operator=(const Item &other);

    /**
     * compares two item instances. Two instances are equal,
     * if the wrapped resources are equal. See ResourceWrapper::operator==()
     * for details.
     *
     * @param other the item to compare this item to
     */
    bool operator==(const Item &other) const;

    /**
     * interface for item visitors. See SpecificItemVisitor for
     * more information.
     *
     * @param visitor a visitor visiting this object
     */
    bool accept(SpecificItemVisitor *visitor) override;

    /**
     * The item's title (required).
     *
     * @return The item's title as HTML, or a null string if not specified
     */
    QString title() const;

    /**
     * A brief description/abstract of the item.
     * if encodedContent() is not provided, this can also contain the full
     * content.
     *
     * @return description as HTML, or a null string if not specified
     */
    QString description() const;

    /**
     * The item's URL, usually pointing to a website containing the
     * full content (news article, blog entry etc.).
     *
     * @return the link
     */
    QString link() const;

    /**
     * returns a dublin core description of this
     * item (including metadata such as item author
     * or subject)
     */
    DublinCore dc() const;

    /**
     * returns content (@c content:encoded) as HTML.
     *
     * @return content as HTML, or a null string if not specified
     */
    QString encodedContent() const;

    //@cond PRIVATE
    /**
     * @internal
     * returns the title unmodified
     * used by Document
     */
    QString originalTitle() const;

    /**
     * @internal
     * returns the description unmodified
     * used by Document
     */
    QString originalDescription() const;

    //@endcond

    /**
     * Returns a description of the item for debugging purposes.
     *
     * @return debug string
     */
    QString debugInfo() const;

private:
    class Private;
    std::unique_ptr<Private> const d;
};

} // namespace RDF
} // namespace Syndication

#endif //  SYNDICATION_RDF_ITEM_H