/**
 *    Copyright (C) 2022-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/query/stats/collection_statistics_impl.h"

#include "mongo/db/client.h"
#include "mongo/db/query/stats/stats_catalog.h"

namespace mongo::stats {

CollectionStatisticsImpl::CollectionStatisticsImpl(double cardinality, const NamespaceString& nss)
    : _cardinality{cardinality}, _histograms{}, _nss{nss} {};

double CollectionStatisticsImpl::getCardinality() const {
    return _cardinality;
}

void CollectionStatisticsImpl::addHistogram(const std::string& path,
                                            std::shared_ptr<const ArrayHistogram> histogram) const {
    _histograms[path] = histogram;
}

const ArrayHistogram* CollectionStatisticsImpl::getHistogram(const std::string& path) const {
    if (auto mapIt = _histograms.find(path); mapIt != _histograms.end()) {
        return mapIt->second.get();
    } else {
        uassert(8423368, "no current client", Client::getCurrent());
        auto opCtx = Client::getCurrent()->getOperationContext();
        uassert(8423367, "no operation context", opCtx);
        StatsCatalog& statsCatalog = StatsCatalog::get(opCtx);
        const auto swHistogram = statsCatalog.getHistogram(opCtx, _nss, path);
        if (!swHistogram.isOK()) {
            if (swHistogram != ErrorCodes::NamespaceNotFound) {
                uasserted(swHistogram.getStatus().code(),
                          str::stream()
                              << "Error getting histograms for path " << _nss.toStringForErrorMsg()
                              << " : " << path << swHistogram.getStatus().reason());
            }
            return nullptr;
        }
        const auto histogram = std::move(swHistogram.getValue());
        addHistogram(path, histogram);
        return histogram.get();
    }
}

}  // namespace mongo::stats