/**
 *    Copyright (C) 2018-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    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
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, 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. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/db/commands/server_status_metric.h"
#include "mongo/s/grid.h"
#include "mongo/s/query/cluster_cursor_manager.h"

namespace mongo {
namespace {

//
// ServerStatus metric cursor counts.
//

class ClusterCursorStats final : public ServerStatusMetric {
public:
    ClusterCursorStats() : ServerStatusMetric("cursor") {}

    void appendAtLeaf(BSONObjBuilder& b) const final {
        auto grid = Grid::get(getGlobalServiceContext());
        BSONObjBuilder cursorBob(b.subobjStart(_leafName));
        cursorBob.append("timedOut",
                         static_cast<long long>(grid->getCursorManager()->cursorsTimedOut()));
        {
            BSONObjBuilder openBob(cursorBob.subobjStart("open"));
            auto stats = grid->getCursorManager()->stats();
            openBob.append("multiTarget", static_cast<long long>(stats.cursorsMultiTarget));
            openBob.append("singleTarget", static_cast<long long>(stats.cursorsSingleTarget));
            openBob.append("queuedData", static_cast<long long>(stats.cursorsQueuedData));
            openBob.append("pinned", static_cast<long long>(stats.cursorsPinned));
            openBob.append(
                "total",
                static_cast<long long>(stats.cursorsMultiTarget + stats.cursorsSingleTarget));
            openBob.doneFast();
        }
        cursorBob.done();
    }
};

ClusterCursorStats& clusterCursorStats = addMetricToTree(std::make_unique<ClusterCursorStats>());

}  // namespace
}  // namespace mongo