/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2017                                                               *
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 ****************************************************************************************/

#include "torrentsynchronization.h"

#include <modules/sync/syncmodule.h>

#include <openspace/documentation/verifier.h>
#include <openspace/engine/openspaceengine.h>
#include <openspace/engine/moduleengine.h>


#include <ghoul/logging/logmanager.h>
#include <ghoul/filesystem/filesystem.h>


namespace {
    const char* _loggerCat = "TorrentSynchronization";
    const char* KeyIdentifier = "Identifier";
    const char* KeyMagnet = "Magnet";
}

namespace openspace {

TorrentSynchronization::TorrentSynchronization(const ghoul::Dictionary& dict)
    : openspace::ResourceSynchronization()
{
    documentation::testSpecificationAndThrow(
        Documentation(),
        dict,
        "TorrentSynchroniztion"
    );

    _identifier = dict.value<std::string>(KeyIdentifier);
    _magnetLink = dict.value<std::string>(KeyMagnet);

    // Configure synchronization based on global settings in SyncModule 
    // TODO: For testability and decreaing deps, make it possible to inject this instead.
    // For example, allow this configuration to be done by the TemplateFactory.
    SyncModule* syncModule = OsEng.moduleEngine().module<SyncModule>();
    _synchronizationRoot = syncModule->synchronizationRoot();
    _torrentClient = syncModule->torrentClient();
}

documentation::Documentation TorrentSynchronization::Documentation() {
    using namespace openspace::documentation;
    return {
        "TorrentSynchronization",
        "torrent_synchronization",
        {
            {
                KeyIdentifier,
                new StringVerifier,
                Optional::No,
                "A unique identifier for this torrent"
            },
            {
                KeyMagnet,
                new StringVerifier,
                Optional::No,
                "A magnet link identifying the torrent"
            }
        }
    };
}

std::string TorrentSynchronization::uniformResourceName() const {
    size_t begin = _magnetLink.find("=urn") + 1;
    size_t end = _magnetLink.find('&', begin);
    std::string xs = _magnetLink.substr(begin, end == std::string::npos ? end : (end - begin));
    std::transform(xs.begin(), xs.end(), xs.begin(), [](char x) {
        if (x == ':') return '.';
        return x;
    });
    return xs;
}

std::string TorrentSynchronization::directory() {
    ghoul::filesystem::Directory d(
        _synchronizationRoot +
        ghoul::filesystem::FileSystem::PathSeparator +
        "torrent" +
        ghoul::filesystem::FileSystem::PathSeparator +
        _identifier +
        ghoul::filesystem::FileSystem::PathSeparator +
        uniformResourceName()
    );

    return FileSys.absPath(d);
}

void TorrentSynchronization::start() {
    if (_enabled) {
        return;
    }
    _enabled = true;
    _torrentId = _torrentClient->addMagnetLink(
        _magnetLink,
        directory(),
        [this](TorrentClient::Progress p) {
            updateTorrentProgress(p);
        }
    );

}

void TorrentSynchronization::cancel() {
    if (_enabled) {
        _torrentClient->removeTorrent(_torrentId);
        _enabled = false;
    }
}

void TorrentSynchronization::clear() {
    // Todo: remove directory!
}


size_t TorrentSynchronization::nSynchronizedBytes() {
    return 0;
}

size_t TorrentSynchronization::nTotalBytes() {
    return 0;
}

bool TorrentSynchronization::nTotalBytesIsKnown() {
    return false;
}

void TorrentSynchronization::updateTorrentProgress(TorrentClient::Progress) {
    // TODO: implement this
}

} // namespace openspace