// 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 "util/date_func.h"

#include <fmt/compile.h>

#include <fmt/format.h>

#include <glog/logging.h>

#include <cstring>

#include <ctime>

#include "common/cast_set.h"

#include "core/types.h"

#include "core/value/time_value.h"

#include "core/value/vdatetime_value.h"

#include "exec/common/int_exp.h"

#include "exprs/function/cast/cast_to_timestamptz.h"

namespace doris {

VecDateTimeValue timestamp_from_datetime(const std::string& datetime_str) {

    tm time_tm;

    char* res = strptime(datetime_str.c_str(), "%Y-%m-%d %H:%M:%S", &time_tm);

    uint64_t value = 0;

    if (nullptr != res) {

        value = ((time_tm.tm_year + 1900) * 10000L + (time_tm.tm_mon + 1) * 100L +

                 time_tm.tm_mday) *

                        1000000L +

                time_tm.tm_hour * 10000L + time_tm.tm_min * 100L + time_tm.tm_sec;

    } else {

        // 1400 - 01 - 01

        value = 14000101000000;

    }

    return VecDateTimeValue::create_from_olap_datetime(value);

}

VecDateTimeValue timestamp_from_date(const std::string& date_str) {

    tm time_tm;

    char* res = strptime(date_str.c_str(), "%Y-%m-%d", &time_tm);

    uint32_t value = 0;

    if (nullptr != res) {

        value = (uint32_t)((time_tm.tm_year + 1900) * 16 * 32 + (time_tm.tm_mon + 1) * 32 +

                           time_tm.tm_mday);

    } else {

        LOG(WARNING) << "Invalid date string: " << date_str;

        // 1400 - 01 - 01

        value = 716833;

    }

    return VecDateTimeValue::create_from_olap_date(value);

}

//FIXME: try to remove or refactor all those time input/output functions.

uint8_t timev2_to_buffer_from_double(double time, char* buffer, int scale) {

    char* begin = buffer;

    if (time < 0) {

        time = -time;

        *buffer++ = '-';

    }

    auto m_time = (uint64_t)TimeValue::limit_with_bound(time);

    auto hour = static_cast<uint16_t>(m_time / (3600ULL * 1000 * 1000));

    if (hour >= 100) {

        buffer = fmt::format_to(buffer, FMT_COMPILE("{}"), hour);

    } else {

        *buffer++ = (char)('0' + (hour / 10));

        *buffer++ = (char)('0' + (hour % 10));

    }

    *buffer++ = ':';

    m_time %= 3600ULL * 1000 * 1000;

    auto minute = static_cast<uint8_t>(m_time / (60 * 1000 * 1000));

    *buffer++ = (char)('0' + (minute / 10));

    *buffer++ = (char)('0' + (minute % 10));

    *buffer++ = ':';

    m_time %= 60 * 1000 * 1000;

    auto second = static_cast<uint8_t>(m_time / (1000 * 1000));

    *buffer++ = (char)('0' + (second / 10));

    *buffer++ = (char)('0' + (second % 10));

    m_time %= 1000 * 1000;

    if (scale == 0) {

        return static_cast<uint8_t>(buffer - begin);

    }

    *buffer++ = '.';

    memset(buffer, '0', scale);

    buffer += scale;

    int32_t micosecond = m_time % (1000 * 1000);

    micosecond /= common::exp10_i32(6 - scale);

    auto* it = buffer - 1;

    while (micosecond) {

        *it = (char)('0' + (micosecond % 10));

        micosecond /= 10;

        it--;

    }

    DCHECK_LT(scale, 10);

    return static_cast<uint8_t>(buffer - begin);

}

std::string timev2_to_buffer_from_double(double time, int scale) {

    fmt::memory_buffer buffer;

    if (time < 0) {

        time = -time;

        fmt::format_to(buffer, "-");

    }

    auto m_time = TimeValue::limit_with_bound(time);

    auto hour = TimeValue::hour(m_time);

    if (hour >= 100) {

        fmt::format_to(buffer, fmt::format("{}", hour));

    } else {

        fmt::format_to(buffer, fmt::format("{:02d}", hour));

    }

    auto minute = TimeValue::minute(m_time);

    auto second = TimeValue::second(m_time);

    auto micosecond = TimeValue::microsecond(m_time);

    micosecond /= common::exp10_i32(6 - scale);

    switch (scale) {

    case 0:

        fmt::format_to(buffer, fmt::format(FMT_COMPILE(":{:02d}:{:02d}"), minute, second));

        break;

    case 1:

        fmt::format_to(buffer, fmt::format(FMT_COMPILE(":{:02d}:{:02d}.{:01d}"), minute, second,

                                           micosecond));

        break;

    case 2:

        fmt::format_to(buffer, fmt::format(FMT_COMPILE(":{:02d}:{:02d}.{:02d}"), minute, second,

                                           micosecond));

        break;

    case 3:

        fmt::format_to(buffer, fmt::format(FMT_COMPILE(":{:02d}:{:02d}.{:03d}"), minute, second,

                                           micosecond));

        break;

    case 4:

        fmt::format_to(buffer, fmt::format(FMT_COMPILE(":{:02d}:{:02d}.{:04d}"), minute, second,

                                           micosecond));

        break;

    case 5:

        fmt::format_to(buffer, fmt::format(FMT_COMPILE(":{:02d}:{:02d}.{:05d}"), minute, second,

                                           micosecond));

        break;

    case 6:

        fmt::format_to(buffer, fmt::format(FMT_COMPILE(":{:02d}:{:02d}.{:06d}"), minute, second,

                                           micosecond));

        break;

    }

    return fmt::to_string(buffer);

}

} // namespace doris