#ifndef __SYSTEMUSAGE_H__
#define __SYSTEMUSAGE_H__

#include <boost/asio/system_timer.hpp>
#include <list>

/**
 * @brief 参考 https://github.com/improvess/cpp-linux-system-stats
 *
 */
class SystemUsage {
public:
    struct CpuStats { // see http://www.linuxhowtos.org/manpages/5/proc.htm
        int user;
        int nice;
        int system;
        int idle;
        int iowait;
        int irq;
        int softirq;
        int steal;
        int guest;
        int guestNice;

        int totalIdle() const {
            return idle + iowait;
        }

        int totalActive() const {
            return user + nice + system + irq + softirq + steal + guest + guestNice;
        }
    };

    struct NetworkStats {
        std::string interface;
        int64_t receiveBytes = 0;
        int64_t transmitBytes = 0;
        std::chrono::system_clock::time_point time = std::chrono::system_clock::now();
    };
    SystemUsage(boost::asio::io_context &ioContext, const std::string &accessToken);
    void start();

protected:
    void publish(const std::string_view &deviceName, float value, const std::string_view &unit,
                 const std::string_view &friendlyName);
    CpuStats readCpuData();
    float cpuUsage(const CpuStats &first, const CpuStats &second);
    float diskUsage(const std::string &disk);
    NetworkStats networkStats(const std::string &interface);

private:
    boost::asio::io_context &m_ioContext;
    std::shared_ptr<boost::asio::system_timer> m_timer;
    std::string m_accessToken;
    CpuStats m_lastCpuStats;
    std::list<NetworkStats> m_networkStats;
};
#endif // __SYSTEMUSAGE_H__