/*
    * Copyright 2022-2023 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.driver.windows.perfmon;
   
   import java.util.Locale;
   
   import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.sun.jna.platform.win32.Advapi32Util;
  import com.sun.jna.platform.win32.WinReg;
  
  import oshi.annotation.concurrent.ThreadSafe;
  import oshi.util.GlobalConfig;
  import oshi.util.Util;
  
  /**
   * Tests whether performance counters are disabled
   */
  @ThreadSafe
  public final class PerfmonDisabled {
  
      private static final Logger LOG = LoggerFactory.getLogger(PerfmonDisabled.class);
  
      public static final boolean PERF_OS_DISABLED = isDisabled(GlobalConfig.OSHI_OS_WINDOWS_PERFOS_DIABLED, "PerfOS");
      public static final boolean PERF_PROC_DISABLED = isDisabled(GlobalConfig.OSHI_OS_WINDOWS_PERFPROC_DIABLED,
              "PerfProc");
      public static final boolean PERF_DISK_DISABLED = isDisabled(GlobalConfig.OSHI_OS_WINDOWS_PERFDISK_DIABLED,
              "PerfDisk");
  
      /**
       * Everything in this class is static, never instantiate it
       */
      private PerfmonDisabled() {
          throw new AssertionError();
      }
  
      private static boolean isDisabled(String config, String service) {
          String perfDisabled = GlobalConfig.get(config);
          // If null or empty, check registry
          if (Util.isBlank(perfDisabled)) {
              String key = String.format(Locale.ROOT, "SYSTEM\\CurrentControlSet\\Services\\%s\\Performance", service);
              String value = "Disable Performance Counters";
              // If disabled in registry, log warning and return
              if (Advapi32Util.registryValueExists(WinReg.HKEY_LOCAL_MACHINE, key, value)) {
                  Object disabled = Advapi32Util.registryGetValue(WinReg.HKEY_LOCAL_MACHINE, key, value);
                  if (disabled instanceof Integer) {
                      if ((Integer) disabled > 0) {
                          LOG.warn("{} counters are disabled and won't return data: {}\\\\{}\\\\{} > 0.", service,
                                  "HKEY_LOCAL_MACHINE", key, value);
                          return true;
                      }
                  } else {
                      LOG.warn(
                              "Invalid registry value type detected for {} counters. Should be REG_DWORD. Ignoring: {}\\\\{}\\\\{}.",
                              service, "HKEY_LOCAL_MACHINE", key, value);
                  }
              }
              return false;
          }
          // If not null or empty, parse as boolean
          return Boolean.parseBoolean(perfDisabled);
      }
  }