/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2021                                                               *
 *                                                                                       *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
 * software and associated documentation files (the "Software"), to deal in the Software *
 * without restriction, including without limitation the rights to use, copy, modify,    *
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 * permit persons to whom the Software is furnished to do so, subject to the following   *
 * conditions:                                                                           *
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 * The above copyright notice and this permission notice shall be included in all copies *
 * or substantial portions of the Software.                                              *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
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 ****************************************************************************************/

#ifndef __OPENSPACE_MODULE_SYNC___HTTPSYNCHRONIZATION___H__
#define __OPENSPACE_MODULE_SYNC___HTTPSYNCHRONIZATION___H__

#include <openspace/util/resourcesynchronization.h>

#include <thread>
#include <vector>

namespace openspace {

class HttpSynchronization : public ResourceSynchronization {
public:
    HttpSynchronization(const ghoul::Dictionary& dict, std::string synchronizationRoot,
        std::vector<std::string> synchronizationRepositories);

    virtual ~HttpSynchronization();


    std::string directory() override;
    void start() override;
    void cancel() override;
    void clear() override;

    size_t nSynchronizedBytes() override;
    size_t nTotalBytes() override;
    bool nTotalBytesIsKnown() override;

    static documentation::Documentation Documentation();

private:
    void createSyncFile();
    bool hasSyncFile();
    bool trySyncFromUrl(std::string url);

    std::atomic_bool _nTotalBytesKnown = false;
    std::atomic_size_t _nTotalBytes = 0;
    std::atomic_size_t _nSynchronizedBytes = 0;
    std::atomic_bool _shouldCancel = false;

    std::string _identifier;
    int _version = -1;
    std::string _synchronizationRoot;
    std::vector<std::string> _synchronizationRepositories;

    std::thread _syncThread;
};

} // namespace openspace

#endif // __OPENSPACE_MODULE_SYNC___HTTPSYNCHRONIZATION___H__