/*
    * Copyright 2016-2023 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.hardware.platform.mac;
   
   import java.util.Locale;
   
   import com.sun.jna.platform.mac.IOKit.IOConnect;
  
  import oshi.annotation.concurrent.ThreadSafe;
  import oshi.hardware.common.AbstractSensors;
  import oshi.util.platform.mac.SmcUtil;
  
  /**
   * Sensors from SMC
   */
  @ThreadSafe
  final class MacSensors extends AbstractSensors {
  
      // This shouldn't change once determined
      private int numFans = 0;
  
      @Override
      public double queryCpuTemperature() {
          IOConnect conn = SmcUtil.smcOpen();
          double temp = SmcUtil.smcGetFloat(conn, SmcUtil.SMC_KEY_CPU_TEMP);
          SmcUtil.smcClose(conn);
          if (temp > 0d) {
              return temp;
          }
          return 0d;
      }
  
      @Override
      public int[] queryFanSpeeds() {
          // If we don't have fan # try to get it
          IOConnect conn = SmcUtil.smcOpen();
          if (this.numFans == 0) {
              this.numFans = (int) SmcUtil.smcGetLong(conn, SmcUtil.SMC_KEY_FAN_NUM);
          }
          int[] fanSpeeds = new int[this.numFans];
          for (int i = 0; i < this.numFans; i++) {
              fanSpeeds[i] = (int) SmcUtil.smcGetFloat(conn, String.format(Locale.ROOT, SmcUtil.SMC_KEY_FAN_SPEED, i));
          }
          SmcUtil.smcClose(conn);
          return fanSpeeds;
      }
  
      @Override
      public double queryCpuVoltage() {
          IOConnect conn = SmcUtil.smcOpen();
          double volts = SmcUtil.smcGetFloat(conn, SmcUtil.SMC_KEY_CPU_VOLTAGE) / 1000d;
          SmcUtil.smcClose(conn);
          return volts;
      }
  }