/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2023-05-15
 * Description : geolocation engine based on Marble.
 *               (c) 2007-2022 Marble Team
 *               https://invent.kde.org/education/marble/-/raw/master/data/credits_authors.html
 *
 * SPDX-FileCopyrightText: 2023-2024 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 *
 * ============================================================ */

#pragma once

// Qt includes

#include <QObject>
#include <QList>
#include <QHash>
#include <QPoint>
#include <QUrl>
#include <QString>
#include <QStringList>

// Local includes

#include "digikam_export.h"

namespace Marble
{

class AbstractDataPluginModelPrivate;
class AbstractDataPluginItem;
class GeoDataLatLonAltBox;
class MarbleModel;
class ViewportParams;

/**
 * @short An abstract data model (not based on QAbstractModel) for a AbstractDataPlugin.
 *
 * This class is an abstract model for a AbstractDataPlugin.
 * It provides the storage and selection of added <b>items</b> and it is also responsible for
 * downloading item data.
 *
 * The functions <b>getAdditionalItems()</b> and <b>parseFile()</b> have to be reimplemented in
 * a subclass.
 **/
class DIGIKAM_EXPORT AbstractDataPluginModel : public QObject
{
    Q_OBJECT

    /** @todo FIXME Qt Quick segfaults if using the real class here instead of QObject */
    Q_PROPERTY(QObject* favoritesModel READ favoritesModel CONSTANT)

public:

    explicit AbstractDataPluginModel(const QString& name, const MarbleModel* marbleModel, QObject* parent = nullptr);
    ~AbstractDataPluginModel() override;

    const MarbleModel* marbleModel() const;

    /**
     * @brief Get the items on the viewport
     * Returns the currently downloaded images in the @p viewport.
     * The maximum number of images can be specified with @p number,
     * 0 means no limit.
     * @return The list of item with most important item first.
     */
    QList<AbstractDataPluginItem*> items(const ViewportParams* viewport,
                                         qint32 number = 10);

    /**
     * @brief Get all items that contain the given point
     * Returns a list of all items that contain the point @p curpos
     */
    QList<AbstractDataPluginItem*> whichItemAt(const QPoint& curpos);

    /**
     * @brief Sets the settings for all items.
     * Sets the settings for all items before painting. This ensures that all items react on
     * changed settings.
     */
    void setItemSettings(const QHash<QString, QVariant>& itemSettings);

    virtual void setFavoriteItems(const QStringList& list);
    QStringList favoriteItems() const;

    void setFavoriteItemsOnly(bool favoriteOnly);
    bool isFavoriteItemsOnly() const;

    QObject* favoritesModel();

    /**
     * Finds the item with @p id in the list.
     * @return The pointer to the item or (if no item has been found) 0
     */
    AbstractDataPluginItem* findItem(const QString& id) const;

    /**
     * Testing the existence of the item @p id in the list
     */
    bool itemExists(const QString& id) const;

public Q_SLOTS:

    /**
     * Adds the @p items to the list of initialized items. It checks if items with the same id are
     * already in the list and ignores and deletes them in this case.
     */
    void addItemsToList(const QList<AbstractDataPluginItem*>& items);

    /**
     * Convenience method to add one item to the list. See addItemsToList
     */
    void addItemToList(AbstractDataPluginItem* item);

    /**
     * Removes all items
     */
    void clear();

protected:

    /**
     * Managing to get @p number additional items in @p box. This includes generating a url and
     * downloading the corresponding file.
     * This method has to be implemented in a subclass.
     **/
    virtual void getAdditionalItems(const GeoDataLatLonAltBox& box,
                                    qint32 number = 10) = 0;

    /**
     * @brief Retrieve data for a specific item
     * @param id Item id of the item to retrieve
     */
    virtual void getItem(const QString& id);

    /**
     * Parse the @p file and generate items. The items will be added to the list or the method
     * starts additionally needed downloads.
     * This method has to be implemented in a subclass.
     **/
    virtual void parseFile(const QByteArray& file);

    /**
     * Downloads the file from @p url. @p item -> addDownloadedFile() will be called when the
     * download is finished.
     * @param url the file URL
     * @param type The type of the download (to be specified by the subclasser)
     * @param item the data plugin item
     **/
    void downloadItem(const QUrl& url, const QString& type, AbstractDataPluginItem* item);

    /**
     * Download the description file from the @p url.
     */
    void downloadDescriptionFile(const QUrl& url);

    void registerItemProperties(const QMetaObject& item);

private Q_SLOTS:

    /**
     * @brief Get new items with getAdditionalItems if it is reasonable.
     */
    void handleChangedViewport();

    /**
     * @brief This method will assign downloaded files to the corresponding items
     * @param relativeUrlString The string containing the relative (to the downloader path)
     *                          url of the downloaded file.
     * @param id The id of the downloaded file
     */
    void processFinishedJob(const QString& relativeUrlString, const QString& id);

    /**
     * @brief Removes the item from the list.
     */
    void removeItem(QObject* item);

    void favoriteItemChanged(const QString& id, bool isFavorite);

    void scheduleItemSort();

    void themeChanged();

Q_SIGNALS:

    void itemsUpdated();
    void favoriteItemsChanged(const QStringList& favoriteItems);
    void favoriteItemsOnlyChanged();

private:

    AbstractDataPluginModelPrivate* const d = nullptr;

    friend class AbstractDataPluginModelPrivate;
};

} // namespace Marble
