// Copyright 2023 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <Databases/IDatabase.h>
#include <IO/WriteHelpers.h>
#include <Interpreters/Context.h>
#include <Interpreters/InterpreterAlterQuery.h>
#include <Storages/StorageFactory.h>
#include <Storages/StorageNull.h>


namespace DB
{

namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}


void registerStorageNull(StorageFactory & factory)
{
    factory.registerStorage("Null", [](const StorageFactory::Arguments & args) {
        if (!args.engine_args.empty())
            throw Exception(
                "Engine " + args.engine_name + " doesn't support any arguments (" + toString(args.engine_args.size())
                    + " given)",
                ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);

        return StorageNull::create(args.table_name, args.columns);
    });
}

void StorageNull::alter(
    const TableLockHolder &,
    const AlterCommands & params,
    const String & database_name,
    const String & table_name,
    const Context & context)
{
    ColumnsDescription new_columns = getColumns();
    params.apply(new_columns);
    context.getDatabase(database_name)->alterTable(context, table_name, new_columns, {});
    setColumns(std::move(new_columns));
}

} // namespace DB