/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2018  Vladimir Golovnev <glassez@yandex.ru>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */

#include "transfercontroller.h"

#include <QJsonObject>
#include <QList>

#include "base/bittorrent/peeraddress.h"
#include "base/bittorrent/peerinfo.h"
#include "base/bittorrent/session.h"
#include "base/bittorrent/sessionstatus.h"
#include "base/global.h"
#include "base/utils/string.h"
#include "apierror.h"

const QString KEY_TRANSFER_DLSPEED = u"dl_info_speed"_s;
const QString KEY_TRANSFER_DLDATA = u"dl_info_data"_s;
const QString KEY_TRANSFER_DLRATELIMIT = u"dl_rate_limit"_s;
const QString KEY_TRANSFER_UPSPEED = u"up_info_speed"_s;
const QString KEY_TRANSFER_UPDATA = u"up_info_data"_s;
const QString KEY_TRANSFER_UPRATELIMIT = u"up_rate_limit"_s;
const QString KEY_TRANSFER_LAST_EXTERNAL_ADDRESS_V4 = u"last_external_address_v4"_s;
const QString KEY_TRANSFER_LAST_EXTERNAL_ADDRESS_V6 = u"last_external_address_v6"_s;
const QString KEY_TRANSFER_DHT_NODES = u"dht_nodes"_s;
const QString KEY_TRANSFER_CONNECTION_STATUS = u"connection_status"_s;

// Returns the global transfer information in JSON format.
// The return value is a JSON-formatted dictionary.
// The dictionary keys are:
//   - "dl_info_speed": Global download rate
//   - "dl_info_data": Data downloaded this session
//   - "up_info_speed": Global upload rate
//   - "up_info_data": Data uploaded this session
//   - "dl_rate_limit": Download rate limit
//   - "up_rate_limit": Upload rate limit
//   - "last_external_address_v4": external IPv4 address
//   - "last_external_address_v6": external IPv6 address
//   - "dht_nodes": DHT nodes connected to
//   - "connection_status": Connection status
void TransferController::infoAction()
{
    const auto *btSession = BitTorrent::Session::instance();
    const BitTorrent::SessionStatus &sessionStatus = btSession->status();

    QJsonObject dict;

    dict[KEY_TRANSFER_DLSPEED] = static_cast<qint64>(sessionStatus.payloadDownloadRate);
    dict[KEY_TRANSFER_DLDATA] = static_cast<qint64>(sessionStatus.totalPayloadDownload);
    dict[KEY_TRANSFER_UPSPEED] = static_cast<qint64>(sessionStatus.payloadUploadRate);
    dict[KEY_TRANSFER_UPDATA] = static_cast<qint64>(sessionStatus.totalPayloadUpload);
    dict[KEY_TRANSFER_DLRATELIMIT] = btSession->downloadSpeedLimit();
    dict[KEY_TRANSFER_UPRATELIMIT] = btSession->uploadSpeedLimit();
    dict[KEY_TRANSFER_LAST_EXTERNAL_ADDRESS_V4] = btSession->lastExternalIPv4Address();
    dict[KEY_TRANSFER_LAST_EXTERNAL_ADDRESS_V6] = btSession->lastExternalIPv6Address();
    dict[KEY_TRANSFER_DHT_NODES] = static_cast<qint64>(sessionStatus.dhtNodes);
    if (!btSession->isListening())
        dict[KEY_TRANSFER_CONNECTION_STATUS] = u"disconnected"_s;
    else
        dict[KEY_TRANSFER_CONNECTION_STATUS] = sessionStatus.hasIncomingConnections ? u"connected"_s : u"firewalled"_s;

    setResult(dict);
}

void TransferController::uploadLimitAction()
{
    setResult(QString::number(BitTorrent::Session::instance()->uploadSpeedLimit()));
}

void TransferController::downloadLimitAction()
{
    setResult(QString::number(BitTorrent::Session::instance()->downloadSpeedLimit()));
}

void TransferController::setUploadLimitAction()
{
    requireParams({u"limit"_s});
    qlonglong limit = params()[u"limit"_s].toLongLong();
    if (limit == 0) limit = -1;

    BitTorrent::Session::instance()->setUploadSpeedLimit(limit);

    setResult(QString());
}

void TransferController::setDownloadLimitAction()
{
    requireParams({u"limit"_s});
    qlonglong limit = params()[u"limit"_s].toLongLong();
    if (limit == 0) limit = -1;

    BitTorrent::Session::instance()->setDownloadSpeedLimit(limit);

    setResult(QString());
}

void TransferController::toggleSpeedLimitsModeAction()
{
    BitTorrent::Session *const session = BitTorrent::Session::instance();
    session->setAltGlobalSpeedLimitEnabled(!session->isAltGlobalSpeedLimitEnabled());

    setResult(QString());
}

void TransferController::speedLimitsModeAction()
{
    setResult(QString::number(BitTorrent::Session::instance()->isAltGlobalSpeedLimitEnabled()));
}

void TransferController::setSpeedLimitsModeAction()
{
    requireParams({u"mode"_s});

    const std::optional<int> mode = Utils::String::parseInt(params().value(u"mode"_s));
    if (!mode)
        throw APIError(APIErrorType::BadParams, tr("'mode': invalid argument"));

    // Any non-zero values are considered as alternative mode
    BitTorrent::Session::instance()->setAltGlobalSpeedLimitEnabled(mode != 0);

    setResult(QString());
}

void TransferController::banPeersAction()
{
    requireParams({u"peers"_s});

    const QStringList peers = params()[u"peers"_s].split(u'|');
    for (const QString &peer : peers)
    {
        const BitTorrent::PeerAddress addr = BitTorrent::PeerAddress::parse(peer.trimmed());
        if (!addr.ip.isNull())
            BitTorrent::Session::instance()->banIP(addr.ip.toString());
    }

    setResult(QString());
}

void TransferController::shadowbanPeersAction()
{
    requireParams({u"peers"_s});

    const QStringList peers = params()[u"peers"_s].split(u'|');
    for (const QString &peer : peers)
    {
        const BitTorrent::PeerAddress addr = BitTorrent::PeerAddress::parse(peer.trimmed());
        if (!addr.ip.isNull())
            BitTorrent::Session::instance()->shadowbanIP(addr.ip.toString());
    }
}
