/*
    * Copyright 2016-2023 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.hardware.platform.unix.freebsd;
   
   import java.util.Locale;
   
   import com.sun.jna.Memory;
  import com.sun.jna.platform.unix.LibCAPI.size_t;
  
  import oshi.annotation.concurrent.ThreadSafe;
  import oshi.hardware.common.AbstractSensors;
  import oshi.jna.ByRef.CloseableSizeTByReference;
  import oshi.jna.platform.unix.FreeBsdLibc;
  
  /**
   * Sensors from coretemp
   */
  @ThreadSafe
  final class FreeBsdSensors extends AbstractSensors {
  
      @Override
      public double queryCpuTemperature() {
          return queryKldloadCoretemp();
      }
  
      /*
       * If user has loaded coretemp module via kldload coretemp, sysctl call will return temperature
       *
       * @return Temperature if successful, otherwise NaN
       */
      private static double queryKldloadCoretemp() {
          String name = "dev.cpu.%d.temperature";
          try (CloseableSizeTByReference size = new CloseableSizeTByReference(FreeBsdLibc.INT_SIZE)) {
              int cpu = 0;
              double sumTemp = 0d;
              try (Memory p = new Memory(size.longValue())) {
                  while (0 == FreeBsdLibc.INSTANCE.sysctlbyname(String.format(Locale.ROOT, name, cpu), p, size, null,
                          size_t.ZERO)) {
                      sumTemp += p.getInt(0) / 10d - 273.15;
                      cpu++;
                  }
              }
              return cpu > 0 ? sumTemp / cpu : Double.NaN;
          }
      }
  
      @Override
      public int[] queryFanSpeeds() {
          // Nothing known on FreeBSD for this.
          return new int[0];
      }
  
      @Override
      public double queryCpuVoltage() {
          // Nothing known on FreeBSD for this.
          return 0d;
      }
  }