//
// Created by Мустафаев Селим Мустафаевич on 01.01.2024.
//

#include "DnsmasqSource.h"
#include <exception>
#include <sstream>
#include <iostream>
#include <ranges>
#include <array>
#include <algorithm>

namespace views = std::ranges::views;

DnsmasqSource::DnsmasqSource() {
    _leases.open("/var/lib/misc/dnsmasq.leases");
    if(_leases.fail()) {
        throw std::runtime_error("failed to open leases file");
    }
}

std::vector<prometheus::Labels> DnsmasqSource::readLeases() {
    _leases.clear();
    _leases.seekg(0);

    std::string line;
    std::vector<prometheus::Labels> result;
    auto labels = std::array{ "time", "mac", "ip", "host", "id" };

    while(std::getline(_leases, line)) {
        prometheus::Labels lineMap;
        for(const auto [index, item]: std::views::split(line, ' ') | views::enumerate) {
            lineMap[labels[index]] = std::string_view(item);
        }
        result.push_back(lineMap);
    }

    return result;
}