// 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/parse_util.h"

#include "util/mem_info.h"
#include "util/string_parser.hpp"

namespace doris {

int64_t ParseUtil::parse_mem_spec(const std::string& mem_spec_str, bool* is_percent) {
    if (mem_spec_str.empty()) {
        return 0;
    }

    // Assume last character indicates unit or percent.
    int32_t 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 'g':
    case 'G':
        // Gigabytes.
        multiplier = 1024L * 1024L * 1024L;
        break;

    case '%':
        *is_percent = true;
        break;

    case 'm':
    case 'M':
        // Megabytes.
        multiplier = 1024L * 1024L;
        break;

    case 'b':
    case 'B':
        break;

    default:
        // No unit was given. Default to bytes.
        number_str_len = mem_spec_str.size();
        break;
    }

    StringParser::ParseResult result;
    int64_t bytes;

    if (multiplier != -1) {
        // Parse float - MB or GB
        double limit_val = StringParser::string_to_float<double>(mem_spec_str.data(),
                           number_str_len, &result);

        if (result != StringParser::PARSE_SUCCESS) {
            return -1;
        }

        bytes = multiplier * limit_val;
    } else {
        // Parse int - bytes or percent
        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;
        }

        if (*is_percent) {
            bytes =
                (static_cast<double>(limit_val) / 100.0) * MemInfo::physical_mem();
        } else {
            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;
}

}
