/**
 *    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/matcher/expression_internal_expr_eq.h"

#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"

namespace mongo {

constexpr StringData InternalExprEqMatchExpression::kName;

bool InternalExprEqMatchExpression::matchesSingleElement(const BSONElement& elem,
                                                         MatchDetails* details) const {
    // We use NonLeafArrayBehavior::kMatchSubpath traversal in InternalExprEqMatchExpression. This
    // means matchesSinglElement() will be called when an array is found anywhere along the patch we
    // are matching against. When this occurs, we return 'true' and depend on the corresponding
    // ExprMatchExpression node to filter properly.
    if (elem.type() == BSONType::Array) {
        return true;
    }

    if (elem.canonicalType() != _rhs.canonicalType()) {
        return false;
    }

    auto comp = BSONElement::compareElements(
        elem, _rhs, BSONElement::ComparisonRules::kConsiderFieldName, _collator);
    return comp == 0;
}

std::unique_ptr<MatchExpression> InternalExprEqMatchExpression::shallowClone() const {
    auto clone = std::make_unique<InternalExprEqMatchExpression>(path(), _rhs);
    clone->setCollator(_collator);
    if (getTag()) {
        clone->setTag(getTag()->clone());
    }
    return clone;
}

}  //  namespace mongo