/**
 *    Copyright (C) 2017 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    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
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    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 GNU Affero General 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/schema/expression_internal_schema_object_match.h"

namespace mongo {

constexpr StringData InternalSchemaObjectMatchExpression::kName;

InternalSchemaObjectMatchExpression::InternalSchemaObjectMatchExpression(
    StringData path, std::unique_ptr<MatchExpression> expr)
    : PathMatchExpression(INTERNAL_SCHEMA_OBJECT_MATCH,
                          path,
                          ElementPath::LeafArrayBehavior::kNoTraversal,
                          ElementPath::NonLeafArrayBehavior::kTraverse),
      _sub(std::move(expr)) {}

bool InternalSchemaObjectMatchExpression::matchesSingleElement(const BSONElement& elem,
                                                               MatchDetails* details) const {
    if (elem.type() != BSONType::Object) {
        return false;
    }
    return _sub->matchesBSON(elem.Obj());
}

void InternalSchemaObjectMatchExpression::debugString(StringBuilder& debug, int level) const {
    _debugAddSpace(debug, level);
    debug << kName << "\n";
    _sub->debugString(debug, level + 1);
}

void InternalSchemaObjectMatchExpression::serialize(BSONObjBuilder* out) const {
    BSONObjBuilder objMatchBob(out->subobjStart(path()));
    BSONObjBuilder subBob(objMatchBob.subobjStart(kName));
    _sub->serialize(&subBob);
    subBob.doneFast();
    objMatchBob.doneFast();
}

bool InternalSchemaObjectMatchExpression::equivalent(const MatchExpression* other) const {
    if (matchType() != other->matchType()) {
        return false;
    }

    return _sub->equivalent(other->getChild(0));
}

std::unique_ptr<MatchExpression> InternalSchemaObjectMatchExpression::shallowClone() const {
    auto clone =
        stdx::make_unique<InternalSchemaObjectMatchExpression>(path(), _sub->shallowClone());
    if (getTag()) {
        clone->setTag(getTag()->clone());
    }
    return std::move(clone);
}

MatchExpression::ExpressionOptimizerFunc InternalSchemaObjectMatchExpression::getOptimizer() const {
    return [](std::unique_ptr<MatchExpression> expression) {
        auto& objectMatchExpression =
            static_cast<InternalSchemaObjectMatchExpression&>(*expression);
        objectMatchExpression._sub =
            MatchExpression::optimize(std::move(objectMatchExpression._sub));

        return expression;
    };
}
}  // namespace mongo