// 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.

//

#pragma once

#include <atomic>

#include <cstdint>

namespace doris {

constexpr uint16_t LUT_START_YEAR = 1950;

constexpr uint16_t LUT_END_YEAR = 2030;

constexpr uint8_t NUM_MONTHS = 12;

constexpr uint8_t NUM_DAYS = 31;

uint32_t year_week(uint16_t yy, uint8_t month, uint8_t day);

uint8_t calc_weekday(uint64_t day_nr, bool is_sunday_first_day);

inline bool is_leap(uint32_t year) {

    return ((year % 4) == 0) && ((year % 100 != 0) || ((year % 400) == 0 && year));

}

uint16_t calc_days_in_year(uint32_t year);

uint8_t calc_week(uint16_t yy, uint8_t month, uint8_t day, bool monday_first, bool week_year,

                  bool first_weekday, uint16_t* to_year);

class TimeLUTImpl {

public:

    int8_t week_of_year_table[LUT_END_YEAR - LUT_START_YEAR][NUM_MONTHS][NUM_DAYS];

    uint32_t year_week_table[LUT_END_YEAR - LUT_START_YEAR][NUM_MONTHS][NUM_DAYS];

    int8_t week_table[LUT_END_YEAR - LUT_START_YEAR][NUM_MONTHS][NUM_DAYS];

private:

    friend class TimeLUT;

    TimeLUTImpl();

    void init_time_lut();

};

class TimeLUT {

public:

    static const TimeLUTImpl* GetImplement() {

        static TimeLUT time_lut;

        return time_lut._impl.load();

    }

protected:

    TimeLUT() { _impl.store(new TimeLUTImpl()); }

private:

    std::atomic<const TimeLUTImpl*> _impl;

};

} // namespace doris