/* Copyright (C) 2015
 * swift project Community / Contributors
 *
 * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
 * including this file, may be copied, modified, propagated, or distributed except according to the terms
 * contained in the LICENSE file.
 */

//! \file

#ifndef BLACKCORE_AIRPORTDATAREADER_H
#define BLACKCORE_AIRPORTDATAREADER_H

#include "blackcore/blackcoreexport.h"
#include "blackcore/threadedreader.h"
#include "blackcore/data/dbcaches.h"
#include "blackmisc/aviation/airportlist.h"
#include "blackmisc/network/entityflags.h"
#include <QNetworkAccessManager>

namespace BlackCore
{
    /**
     * Reader for airport database.
     */
    class BLACKCORE_EXPORT CAirportDataReader : public CThreadedReader
    {
        Q_OBJECT

    signals:
        //! Emitted when data is parsed
        void dataRead(BlackMisc::Network::CEntityFlags::Entity entity, BlackMisc::Network::CEntityFlags::ReadState state, int number);

    public:
        //! Constructor
        CAirportDataReader(QObject* parent);

        //! Read airports
        void readInBackgroundThread();

        //! Returns a list of all airports in the database.
        //! \threadsafe
        BlackMisc::Aviation::CAirportList getAirports() const;

    private:
        //! URL for airport list
        BlackMisc::Network::CUrl getAirportsUrl() const;

    private slots:
        //! Parse downloaded JSON file
        void ps_parseAirportData(QNetworkReply *nwReply);

        //! Read Last-Modified header
        void ps_parseAirportHeader(QNetworkReply *nwReply);

        //! Read airports
        void ps_readAirports();

        //! Airport cache changed
        void ps_airportCacheChanged();

    private:
        BlackMisc::CData<BlackCore::Data::TDbAirportCache> m_airportCache {this, &CAirportDataReader::ps_airportCacheChanged};
        mutable QReadWriteLock m_lock;
        quint64 m_lastModified = 0; //!< When was data file updated, obtained from HTTP Last-Modified header, in ms from epoch

    };
} // ns

#endif // guard