// 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.

// This file is copied from

// https://github.com/apache/impala/blob/branch-2.9.0/be/src/util/parse-util.cc

// and modified by Doris

#include "util/parse_util.h"

#include "util/string_parser.hpp"

namespace doris {

int64_t ParseUtil::parse_mem_spec(const std::string& mem_spec_str, int64_t parent_limit,

                                  int64_t physical_mem, bool* is_percent) {

    if (mem_spec_str.empty()) {

        return 0;

    }

    // Assume last character indicates unit or percent.

    auto number_str_len = mem_spec_str.size() - 1;

    *is_percent = false;

    int64_t multiplier = -1;

    // Look for accepted suffix character.

    switch (*mem_spec_str.rbegin()) {

    case 't':

    case 'T':

        // Terabytes.

        multiplier = 1024L * 1024L * 1024L * 1024L;

        break;

    case 'g':

    case 'G':

        // Gigabytes.

        multiplier = 1024L * 1024L * 1024L;

        break;

    case 'm':

    case 'M':

        // Megabytes.

        multiplier = 1024L * 1024L;

        break;

    case 'k':

    case 'K':

        // Kilobytes

        multiplier = 1024L;

        break;

    case 'b':

    case 'B':

        break;

    case '%':

        *is_percent = true;

        break;

    default:

        // No unit was given. Default to bytes.

        number_str_len = (int)mem_spec_str.size();

        break;

    }

    StringParser::ParseResult result;

    int64_t bytes = -1;

    if (multiplier != -1 || *is_percent) {

        // Parse float - MB or GB or percent

        double limit_val =

                StringParser::string_to_float<double>(mem_spec_str.data(), number_str_len, &result);

        if (result != StringParser::PARSE_SUCCESS) {

            return -1;

        }

        if (multiplier != -1) {

            bytes = int64_t((double)multiplier * limit_val);

        } else if (*is_percent) {

            if (parent_limit == -1) {

                bytes = int64_t(limit_val / 100.0 * (double)physical_mem);

            } else {

                bytes = int64_t(limit_val / 100.0 * (double)parent_limit);

            }

        }

    } else {

        // Parse int - bytes

        int64_t limit_val =

                StringParser::string_to_int<int64_t>(mem_spec_str.data(), number_str_len, &result);

        if (result != StringParser::PARSE_SUCCESS) {

            return -1;

        }

        auto limit_val_double =

                StringParser::string_to_float<double>(mem_spec_str.data(), number_str_len, &result);

        if (result == StringParser::PARSE_SUCCESS && limit_val_double != (double)limit_val) {

            return -1; // mem_spec_str is double.

        }

        bytes = limit_val;

    }

    // Accept -1 as indicator for infinite memory that we report by a 0 return value.

    if (bytes == -1) {

        return 0;

    }

    return bytes;

}

} // namespace doris