// SPDX-License-Identifier: LGPL-2.1-or-later
//
// SPDX-FileCopyrightText: 2007 Torsten Rahn <tackat@kde.org>
// SPDX-FileCopyrightText: 2007 Inge Wallin <ingwa@kde.org>
// SPDX-FileCopyrightText: 2009 Jens-Michael Hoffmann <jensmh@gmx.de>
//

//
// The HttpDownloadManager manages http downloads.
//

#ifndef MARBLE_HTTPDOWNLOADMANAGER_H
#define MARBLE_HTTPDOWNLOADMANAGER_H

#include <QObject>

#include "MarbleGlobal.h"
#include "marble_export.h"

class QUrl;

namespace Marble
{

class DownloadPolicy;
class StoragePolicy;

/**
 * @short This class manages scheduled downloads.
 *
 * The downloadmanager offers a maximum number of active jobs and a
 * limit for pending jobs.  it also takes care that the job queue
 * won't be polluted by jobs that timed out already.
 *
 * @author Torsten Rahn
 */

class MARBLE_EXPORT HttpDownloadManager : public QObject
{
    Q_OBJECT

public:
    /**
     * Creates a new http download manager.
     *
     * @note HttpDownloadManager doesn't take ownership of @p policy.
     *
     * @param policy The storage policy for this manager.
     */
    explicit HttpDownloadManager(StoragePolicy *policy);

    /**
     * Destroys the http download manager.
     */
    ~HttpDownloadManager() override;

    /**
     * Switches loading on/off, useful for offline mode.
     */
    void setDownloadEnabled(const bool enable);
    void addDownloadPolicy(const DownloadPolicy &);

    static QByteArray userAgent(const QString &platform, const QString &plugin);

public Q_SLOTS:

    /**
     * Adds a new job with a sourceUrl, destination file name and given id.
     */
    void addJob(const QUrl &sourceUrl, const QString &destFilename, const QString &id, const DownloadUsage usage);

Q_SIGNALS:
    void downloadComplete(const QString &, const QString &);

    /**
     * This signal is emitted if a file is downloaded and the data argument
     * contains the files content. The HttpDownloadManager takes care to save
     * it using the given storage policy.
     */
    void downloadComplete(const QByteArray &data, const QString &initiatorId);

    /**
     * Signal is emitted when a new job is added to the queue.
     */
    void jobAdded();

    /**
     * Signal is emitted when a job is removed from the queue.
     * The job might be completed or blacklisted.
     */
    void jobRemoved();

    /**
     * A job was queued, activated or removed (finished, failed)
     */
    void progressChanged(int active, int queued);

private:
    Q_DISABLE_COPY(HttpDownloadManager)

    class Private;
    Private *const d;

    Q_PRIVATE_SLOT(d, void finishJob(const QByteArray &, const QString &, const QString &id))
    Q_PRIVATE_SLOT(d, void requeue())
    Q_PRIVATE_SLOT(d, void startRetryTimer())
};

}

#endif // MARBLE_HTTPDOWNLOADMANAGER_H
