/**
 *    Copyright (C) 2020-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.
 */

#pragma once

#include <utility>

#include "mongo/base/string_data.h"
#include "mongo/logv2/log_attr.h"
#include "mongo/logv2/log_detail.h"

namespace mongo {
namespace logv2 {
namespace detail {
// We want to provide unique names even though we are not using the names.
template <std::size_t I>
inline constexpr char digit = "0123456789"[I];
template <std::size_t N>
inline constexpr const char attrName[4] = {'_', digit<(N / 10) % 10>, digit<N % 10>, '\0'};

template <std::size_t... Is, typename... Args>
auto argAttrs_(std::index_sequence<Is...>, const Args&... args) {
    return makeAttributeStorage((AttrUdl{attrName<Is>} = args)...);
}

template <typename... Args>
auto argAttrs(const Args&... args) {
    return argAttrs_(std::index_sequence_for<Args...>{}, args...);
}
}  // namespace detail

/**
 * Prototype-only unstructured logging, not allowed to commit to master
 *
 * Instead of named attributes as arguments, it accepts loggable types directly.
 * Will emit a log with a single formatted string as "msg", and no attributes.
 *
 * Ex:
 *     #include "mongo/logv2/log_debug.h"
 *     namespace mongo {
 *     void f(int x, double y) {
 *        logd("f called with x={}, y={}", x, y);
 *     }
 *     }  // namespace mongo
 */
template <typename... Args>
void logd(StringData message, const Args&... args) {  // NOLINT
    doUnstructuredLogImpl(LogSeverity::Log(),         // NOLINT
                          LogOptions{LogComponent::kDefault},
                          message,
                          detail::argAttrs(args...));
}

}  // namespace logv2

using logv2::logd;  // NOLINT

}  // namespace mongo