#include <llarp/util/service_manager.hpp>

#include <systemd/sd-daemon.h>
#include <cassert>
#include <llarp.hpp>
#include <llarp/router/router.hpp>
#include <llarp/util/logging.hpp>

namespace llarp::sys
{
  class SD_Manager : public I_SystemLayerManager
  {
    llarp::sys::ServiceState m_State{ServiceState::Initial};

   public:
    /// change our state and report it to the system layer
    void
    we_changed_our_state(ServiceState st) override
    {
      m_State = st;
      report_changed_state();
    }

    void
    report_changed_state() override
    {
      if (m_State == ServiceState::Running)
      {
        ::sd_notify(0, "READY=1");
        return;
      }
      if (m_State == ServiceState::Stopping)
      {
        ::sd_notify(0, "STOPPING=1");
        return;
      }
    }

    void
    report_periodic_stats() override
    {
      if (m_Context and m_Context->router and not m_disable)
      {
        auto status = fmt::format("WATCHDOG=1\nSTATUS={}", m_Context->router->status_line());
        ::sd_notify(0, status.c_str());
      }
    }

    void
    system_changed_our_state(ServiceState) override
    {
      // not applicable on systemd
    }
  };

  SD_Manager _manager{};
  I_SystemLayerManager* const service_manager = &_manager;

}  // namespace llarp::sys