/*
    * Copyright 2020-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.driver.windows.perfmon;
   
   import static oshi.driver.windows.perfmon.PerfmonConstants.PROCESSOR;
   import static oshi.driver.windows.perfmon.PerfmonConstants.PROCESSOR_INFORMATION;
   import static oshi.driver.windows.perfmon.PerfmonConstants.WIN32_PERF_RAW_DATA_COUNTERS_PROCESSOR_INFORMATION_WHERE_NOT_NAME_LIKE_TOTAL;
  import static oshi.driver.windows.perfmon.PerfmonConstants.WIN32_PERF_RAW_DATA_PERF_OS_PROCESSOR_WHERE_NAME_NOT_TOTAL;
  import static oshi.driver.windows.perfmon.PerfmonConstants.WIN32_PERF_RAW_DATA_PERF_OS_PROCESSOR_WHERE_NAME_TOTAL;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import com.sun.jna.platform.win32.VersionHelpers;
  
  import oshi.annotation.concurrent.ThreadSafe;
  import oshi.util.platform.windows.PerfCounterQuery;
  import oshi.util.platform.windows.PerfCounterQuery.PdhCounterProperty;
  import oshi.util.platform.windows.PerfCounterWildcardQuery;
  import oshi.util.platform.windows.PerfCounterWildcardQuery.PdhCounterWildcardProperty;
  import oshi.util.tuples.Pair;
  
  /**
   * Utility to query Processor performance counter
   */
  @ThreadSafe
  public final class ProcessorInformation {
  
      private static final boolean IS_WIN7_OR_GREATER = VersionHelpers.IsWindows7OrGreater();
  
      /**
       * Processor performance counters
       */
      public enum ProcessorTickCountProperty implements PdhCounterWildcardProperty {
          // First element defines WMI instance name field and PDH instance filter
          NAME(PerfCounterQuery.NOT_TOTAL_INSTANCES),
          // Remaining elements define counters
          PERCENTDPCTIME("% DPC Time"), //
          PERCENTINTERRUPTTIME("% Interrupt Time"), //
          PERCENTPRIVILEGEDTIME("% Privileged Time"), //
          PERCENTPROCESSORTIME("% Processor Time"), //
          PERCENTUSERTIME("% User Time");
  
          private final String counter;
  
          ProcessorTickCountProperty(String counter) {
              this.counter = counter;
          }
  
          @Override
          public String getCounter() {
              return counter;
          }
      }
  
      /**
       * Processor performance counters including utility counters
       */
      public enum ProcessorUtilityTickCountProperty implements PdhCounterWildcardProperty {
          // First element defines WMI instance name field and PDH instance filter
          NAME(PerfCounterQuery.NOT_TOTAL_INSTANCES),
          // Remaining elements define counters
          PERCENTDPCTIME("% DPC Time"), //
          PERCENTINTERRUPTTIME("% Interrupt Time"), //
          PERCENTPRIVILEGEDTIME("% Privileged Time"), //
          PERCENTPROCESSORTIME("% Processor Time"), //
          // The above 3 counters are 100ns base type
          // For PDH accessible as secondary counter in any of them
          TIMESTAMP_SYS100NS("% Processor Time_Base"), //
          PERCENTPRIVILEGEDUTILITY("% Privileged Utility"), //
          PERCENTPROCESSORUTILITY("% Processor Utility"), //
          PERCENTPROCESSORUTILITY_BASE("% Processor Utility_Base"), //
          PERCENTUSERTIME("% User Time");
  
          private final String counter;
  
          ProcessorUtilityTickCountProperty(String counter) {
              this.counter = counter;
          }
  
          @Override
          public String getCounter() {
              return counter;
          }
      }
  
      /**
       * System interrupts counters
       */
      public enum InterruptsProperty implements PdhCounterProperty {
          INTERRUPTSPERSEC(PerfCounterQuery.TOTAL_INSTANCE, "Interrupts/sec");
  
          private final String instance;
          private final String counter;
  
          InterruptsProperty(String instance, String counter) {
             this.instance = instance;
             this.counter = counter;
         }
 
         @Override
         public String getInstance() {
             return instance;
         }
 
         @Override
         public String getCounter() {
             return counter;
         }
     }
 
     /**
      * Processor Frequency counters. Requires Win7 or greater
      */
     public enum ProcessorFrequencyProperty implements PdhCounterWildcardProperty {
         // First element defines WMI instance name field and PDH instance filter
         NAME(PerfCounterQuery.NOT_TOTAL_INSTANCES),
         // Remaining elements define counters
         PERCENTOFMAXIMUMFREQUENCY("% of Maximum Frequency");
 
         private final String counter;
 
         ProcessorFrequencyProperty(String counter) {
             this.counter = counter;
         }
 
         @Override
         public String getCounter() {
             return counter;
         }
     }
 
     private ProcessorInformation() {
     }
 
     /**
      * Returns processor performance counters.
      *
      * @return Performance Counters for processors.
      */
     public static Pair<List<String>, Map<ProcessorTickCountProperty, List<Long>>> queryProcessorCounters() {
         if (PerfmonDisabled.PERF_OS_DISABLED) {
             return new Pair<>(Collections.emptyList(), Collections.emptyMap());
         }
         return IS_WIN7_OR_GREATER ? PerfCounterWildcardQuery.queryInstancesAndValues(ProcessorTickCountProperty.class,
                 PROCESSOR_INFORMATION, WIN32_PERF_RAW_DATA_COUNTERS_PROCESSOR_INFORMATION_WHERE_NOT_NAME_LIKE_TOTAL)
                 : PerfCounterWildcardQuery.queryInstancesAndValues(ProcessorTickCountProperty.class, PROCESSOR,
                         WIN32_PERF_RAW_DATA_PERF_OS_PROCESSOR_WHERE_NAME_NOT_TOTAL);
     }
 
     /**
      * Returns processor capacity performance counters.
      *
      * @return Performance Counters for processor capacity.
      */
     public static Pair<List<String>, Map<ProcessorUtilityTickCountProperty, List<Long>>> queryProcessorCapacityCounters() {
         if (PerfmonDisabled.PERF_OS_DISABLED) {
             return new Pair<>(Collections.emptyList(), Collections.emptyMap());
         }
         return PerfCounterWildcardQuery.queryInstancesAndValues(ProcessorUtilityTickCountProperty.class,
                 PROCESSOR_INFORMATION, WIN32_PERF_RAW_DATA_COUNTERS_PROCESSOR_INFORMATION_WHERE_NOT_NAME_LIKE_TOTAL);
     }
 
     /**
      * Returns system interrupts counters.
      *
      * @return Interrupts counter for the total of all processors.
      */
     public static Map<InterruptsProperty, Long> queryInterruptCounters() {
         if (PerfmonDisabled.PERF_OS_DISABLED) {
             return Collections.emptyMap();
         }
         return PerfCounterQuery.queryValues(InterruptsProperty.class, PROCESSOR,
                 WIN32_PERF_RAW_DATA_PERF_OS_PROCESSOR_WHERE_NAME_TOTAL);
     }
 
     /**
      * Returns processor frequency counters.
      *
      * @return Processor frequency counter for each processor.
      */
     public static Pair<List<String>, Map<ProcessorFrequencyProperty, List<Long>>> queryFrequencyCounters() {
         if (PerfmonDisabled.PERF_OS_DISABLED) {
             return new Pair<>(Collections.emptyList(), Collections.emptyMap());
         }
         return PerfCounterWildcardQuery.queryInstancesAndValues(ProcessorFrequencyProperty.class, PROCESSOR_INFORMATION,
                 WIN32_PERF_RAW_DATA_COUNTERS_PROCESSOR_INFORMATION_WHERE_NOT_NAME_LIKE_TOTAL);
     }
 }