/**
 * 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/update/update_node.h"

#include "mongo/base/status_with.h"
#include "mongo/db/update/update_array_node.h"
#include "mongo/db/update/update_object_node.h"

namespace mongo {

// static
std::unique_ptr<UpdateNode> UpdateNode::createUpdateNodeByMerging(const UpdateNode& leftNode,
                                                                  const UpdateNode& rightNode,
                                                                  FieldRef* pathTaken) {
    if (leftNode.type == UpdateNode::Type::Object && rightNode.type == UpdateNode::Type::Object) {
        return UpdateObjectNode::createUpdateNodeByMerging(
            static_cast<const UpdateObjectNode&>(leftNode),
            static_cast<const UpdateObjectNode&>(rightNode),
            pathTaken);
    } else if (leftNode.type == UpdateNode::Type::Array &&
               rightNode.type == UpdateNode::Type::Array) {
        return UpdateArrayNode::createUpdateNodeByMerging(
            static_cast<const UpdateArrayNode&>(leftNode),
            static_cast<const UpdateArrayNode&>(rightNode),
            pathTaken);
    } else {
        uasserted(
            ErrorCodes::ConflictingUpdateOperators,
            (str::stream() << "Update created a conflict at '" << pathTaken->dottedField() << "'"));
    }
}

}  // namespace mongo