/*
    * Copyright 2016-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.hardware.platform.mac;
   
   import static oshi.util.Memoizer.memoize;
   
   import java.nio.charset.StandardCharsets;
  import java.util.function.Supplier;
  
  import com.sun.jna.Native;
  import com.sun.jna.platform.mac.IOKit.IORegistryEntry;
  import com.sun.jna.platform.mac.IOKitUtil;
  
  import oshi.annotation.concurrent.Immutable;
  import oshi.hardware.Baseboard;
  import oshi.hardware.Firmware;
  import oshi.hardware.common.AbstractComputerSystem;
  import oshi.util.Constants;
  import oshi.util.Util;
  import oshi.util.tuples.Quartet;
  
  /**
   * Hardware data obtained from ioreg.
   */
  @Immutable
  final class MacComputerSystem extends AbstractComputerSystem {
  
      private final Supplier<Quartet<String, String, String, String>> manufacturerModelSerialUUID = memoize(
              MacComputerSystem::platformExpert);
  
      @Override
      public String getManufacturer() {
          return manufacturerModelSerialUUID.get().getA();
      }
  
      @Override
      public String getModel() {
          return manufacturerModelSerialUUID.get().getB();
      }
  
      @Override
      public String getSerialNumber() {
          return manufacturerModelSerialUUID.get().getC();
      }
  
      @Override
      public String getHardwareUUID() {
          return manufacturerModelSerialUUID.get().getD();
      }
  
      @Override
      public Firmware createFirmware() {
          return new MacFirmware();
      }
  
      @Override
      public Baseboard createBaseboard() {
          return new MacBaseboard();
      }
  
      private static Quartet<String, String, String, String> platformExpert() {
          String manufacturer = null;
          String model = null;
          String serialNumber = null;
          String uuid = null;
          IORegistryEntry platformExpert = IOKitUtil.getMatchingService("IOPlatformExpertDevice");
          if (platformExpert != null) {
              byte[] data = platformExpert.getByteArrayProperty("manufacturer");
              if (data != null) {
                  manufacturer = Native.toString(data, StandardCharsets.UTF_8);
              }
              data = platformExpert.getByteArrayProperty("model");
              if (data != null) {
                  model = Native.toString(data, StandardCharsets.UTF_8);
              }
              serialNumber = platformExpert.getStringProperty("IOPlatformSerialNumber");
              uuid = platformExpert.getStringProperty("IOPlatformUUID");
              platformExpert.release();
          }
          return new Quartet<>(Util.isBlank(manufacturer) ? "Apple Inc." : manufacturer,
                  Util.isBlank(model) ? Constants.UNKNOWN : model,
                  Util.isBlank(serialNumber) ? Constants.UNKNOWN : serialNumber,
                  Util.isBlank(uuid) ? Constants.UNKNOWN : uuid);
      }
  }