/**
 *    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/platform/basic.h"

#include "mongo/db/update/compare_node.h"

#include "mongo/db/query/collation/collator_interface.h"

namespace mongo {

Status CompareNode::init(BSONElement modExpr,
                         const boost::intrusive_ptr<ExpressionContext>& expCtx) {
    invariant(modExpr.ok());
    _val = modExpr;
    setCollator(expCtx->getCollator());
    return Status::OK();
}

void CompareNode::setCollator(const CollatorInterface* collator) {
    invariant(!_collator);
    _collator = collator;
}

ModifierNode::ModifyResult CompareNode::updateExistingElement(mutablebson::Element* element,
                                                              const FieldRef& elementPath) const {
    const auto compareVal = element->compareWithBSONElement(_val, _collator, false);
    if ((compareVal == 0) || ((_mode == CompareMode::kMax) ? (compareVal > 0) : (compareVal < 0))) {
        return ModifyResult::kNoOp;
    } else {
        invariant(element->setValueBSONElement(_val));
        return ModifyResult::kNormalUpdate;
    }
}

void CompareNode::setValueForNewElement(mutablebson::Element* element) const {
    invariant(element->setValueBSONElement(_val));
}

}  // namespace mongo