/**
 *    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 <memory>
#include <string>

#include "mongo/bson/bsonobj.h"
#include "mongo/scripting/engine.h"

namespace mongo {
/**
 * This is a wrapper class encapsulating common logic for executing JavaScript code in $where match
 * expression which can be used both in the SBE and classic engines.
 */
class JsFunction {
public:
    JsFunction(OperationContext* opCtx, std::string code, std::string dbName);
    JsFunction(const JsFunction& other);
    JsFunction(JsFunction&& other) = delete;

    JsFunction& operator=(const JsFunction& other);
    JsFunction& operator=(JsFunction&& other) = delete;

    bool runAsPredicate(const BSONObj& obj) const;

    const std::string& getCode() const {
        return _code;
    }

    const std::string& getDbName() const {
        return _dbName;
    }

    size_t getApproximateSize() const;

private:
    void _init(OperationContext* opCtx, std::string code, std::string dbName);

    std::string _code;
    std::string _dbName;
    std::unique_ptr<Scope> _scope;
    ScriptingFunction _func;
};

}  // namespace mongo