/**
 *    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.
 */

#pragma once

#include "mongo/bson/bsonobjbuilder.h"

namespace mongo {

inline void addToArray(BSONArrayBuilder& builder) {}

template <typename T, typename... Rest>
void addToArray(BSONArrayBuilder& builder, const T& a, Rest... rest) {
    builder << a;
    addToArray(builder, rest...);
}

/** $or helper: BSON(OR(BSON("x" << GT << 7), BSON("y" << LT << 6)));
 * becomes   : {$or: [{x: {$gt: 7}}, {y: {$lt: 6}}]}
 */
template <typename... Args>
inline BSONFieldValue<BSONArray> OR(Args... args) {
    BSONArrayBuilder builder;
    addToArray(builder, args...);
    return {"$or", builder.arr()};
}

/**
 * $and helper: BSON(AND(BSON("x" << GT << 7), BSON("y" << LT << 6)));
 * becomes   : {$and: [{x: {$gt: 7}}, {y: {$lt: 6}}]}
 */
template <typename... Args>
inline BSONFieldValue<BSONArray> AND(Args... args) {
    BSONArrayBuilder builder;
    addToArray(builder, args...);
    return {"$and", builder.arr()};
}

/**
 * $nor helper: BSON(NOR(BSON("x" << GT << 7), BSON("y" << LT << 6)));
 * becomes   : {$nor: [{x: {$gt: 7}}, {y: {$lt: 6}}]}
 */
template <typename... Args>
inline BSONFieldValue<BSONArray> NOR(Args... args) {
    BSONArrayBuilder builder;
    addToArray(builder, args...);
    return {"$nor", builder.arr()};
}

}  // namespace mongo