// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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 <glog/logging.h>

#include <stddef.h>

#include <boost/uuid/random_generator.hpp>

#include <boost/uuid/uuid_io.hpp>

#include <memory>

#include <string>

#include <utility>

#include "common/status.h"

#include "core/block/block.h"

#include "core/block/column_numbers.h"

#include "core/column/column_string.h"

#include "core/data_type/data_type_string.h"

#include "core/types.h"

#include "exec/common/string_utils/string_utils.h"

#include "exprs/aggregate/aggregate_function.h"

#include "exprs/function/function.h"

#include "exprs/function/function_totype.h"

#include "exprs/function/simple_function_factory.h"

namespace doris {

class FunctionContext;

} // namespace doris

namespace doris {

class Uuid : public IFunction {

public:

    static constexpr auto name = "uuid";

    static constexpr size_t uuid_length = 36; //uuid fixed length

    static FunctionPtr create() { return std::make_shared<Uuid>(); }

    String get_name() const override { return name; }

    bool use_default_implementation_for_constants() const override { return false; }

    size_t get_number_of_arguments() const override { return 0; }

    bool is_variadic() const override { return false; }

    DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {

        return std::make_shared<DataTypeString>();

    }

    Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                        uint32_t result, size_t input_rows_count) const override {

        auto col_res = ColumnString::create();

        col_res->get_offsets().reserve(input_rows_count);

        col_res->get_chars().reserve(input_rows_count * uuid_length);

        boost::uuids::random_generator generator;

        for (int i = 0; i < input_rows_count; i++) {

            std::string uuid = boost::uuids::to_string(generator());

            DCHECK(uuid.length() == uuid_length);

            col_res->insert_data_without_reserve(uuid.c_str(), uuid.length());

        }

        block.replace_by_position(result, std::move(col_res));

        return Status::OK();

    }

};

void register_function_uuid(SimpleFunctionFactory& factory) {

    factory.register_function<Uuid>();

}

} // namespace doris