/*
    * Copyright 2020-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.software.os.unix.freebsd;
   
   import static oshi.software.os.OSProcess.State.INVALID;
   import static oshi.software.os.OSProcess.State.OTHER;
   import static oshi.software.os.OSProcess.State.RUNNING;
  import static oshi.software.os.OSProcess.State.SLEEPING;
  import static oshi.software.os.OSProcess.State.STOPPED;
  import static oshi.software.os.OSProcess.State.WAITING;
  import static oshi.software.os.OSProcess.State.ZOMBIE;
  
  import java.util.List;
  import java.util.Map;
  
  import oshi.annotation.concurrent.ThreadSafe;
  import oshi.software.common.AbstractOSThread;
  import oshi.software.os.OSProcess;
  import oshi.software.os.unix.freebsd.FreeBsdOSProcess.PsThreadColumns;
  import oshi.util.ExecutingCommand;
  import oshi.util.ParseUtil;
  
  /**
   * OSThread implementation
   */
  @ThreadSafe
  public class FreeBsdOSThread extends AbstractOSThread {
  
      private int threadId;
      private String name = "";
      private OSProcess.State state = INVALID;
      private long minorFaults;
      private long majorFaults;
      private long startMemoryAddress;
      private long contextSwitches;
      private long kernelTime;
      private long userTime;
      private long startTime;
      private long upTime;
      private int priority;
  
      public FreeBsdOSThread(int processId, Map<PsThreadColumns, String> threadMap) {
          super(processId);
          updateAttributes(threadMap);
      }
  
      public FreeBsdOSThread(int processId, int threadId) {
          super(processId);
          this.threadId = threadId;
          updateAttributes();
      }
  
      @Override
      public int getThreadId() {
          return this.threadId;
      }
  
      @Override
      public String getName() {
          return this.name;
      }
  
      @Override
      public OSProcess.State getState() {
          return this.state;
      }
  
      @Override
      public long getStartMemoryAddress() {
          return this.startMemoryAddress;
      }
  
      @Override
      public long getContextSwitches() {
          return this.contextSwitches;
      }
  
      @Override
      public long getMinorFaults() {
          return this.minorFaults;
      }
  
      @Override
      public long getMajorFaults() {
          return this.majorFaults;
      }
  
      @Override
      public long getKernelTime() {
          return this.kernelTime;
      }
  
      @Override
      public long getUserTime() {
          return this.userTime;
      }
  
     @Override
     public long getUpTime() {
         return this.upTime;
     }
 
     @Override
     public long getStartTime() {
         return this.startTime;
     }
 
     @Override
     public int getPriority() {
         return this.priority;
     }
 
     @Override
     public boolean updateAttributes() {
         List<String> threadList = ExecutingCommand
                 .runNative("ps -awwxo " + FreeBsdOSProcess.PS_THREAD_COLUMNS + " -H -p " + getOwningProcessId());
         // there is no switch for thread in ps command, hence filtering.
         String lwpStr = Integer.toString(this.threadId);
         for (String psOutput : threadList) {
             Map<PsThreadColumns, String> threadMap = ParseUtil.stringToEnumMap(PsThreadColumns.class, psOutput.trim(),
                     ' ');
             if (threadMap.containsKey(PsThreadColumns.PRI) && lwpStr.equals(threadMap.get(PsThreadColumns.LWP))) {
                 return updateAttributes(threadMap);
             }
         }
         this.state = INVALID;
         return false;
     }
 
     private boolean updateAttributes(Map<PsThreadColumns, String> threadMap) {
         this.name = threadMap.get(PsThreadColumns.TDNAME);
         this.threadId = ParseUtil.parseIntOrDefault(threadMap.get(PsThreadColumns.LWP), 0);
         switch (threadMap.get(PsThreadColumns.STATE).charAt(0)) {
         case 'R':
             this.state = RUNNING;
             break;
         case 'I':
         case 'S':
             this.state = SLEEPING;
             break;
         case 'D':
         case 'L':
         case 'U':
             this.state = WAITING;
             break;
         case 'Z':
             this.state = ZOMBIE;
             break;
         case 'T':
             this.state = STOPPED;
             break;
         default:
             this.state = OTHER;
             break;
         }
         long elapsedTime = ParseUtil.parseDHMSOrDefault(threadMap.get(PsThreadColumns.ETIMES), 0L);
         // Avoid divide by zero for processes up less than a second
         this.upTime = elapsedTime < 1L ? 1L : elapsedTime;
         long now = System.currentTimeMillis();
         this.startTime = now - this.upTime;
         this.kernelTime = ParseUtil.parseDHMSOrDefault(threadMap.get(PsThreadColumns.SYSTIME), 0L);
         this.userTime = ParseUtil.parseDHMSOrDefault(threadMap.get(PsThreadColumns.TIME), 0L) - this.kernelTime;
         this.startMemoryAddress = ParseUtil.hexStringToLong(threadMap.get(PsThreadColumns.TDADDR), 0L);
         long nonVoluntaryContextSwitches = ParseUtil.parseLongOrDefault(threadMap.get(PsThreadColumns.NIVCSW), 0L);
         long voluntaryContextSwitches = ParseUtil.parseLongOrDefault(threadMap.get(PsThreadColumns.NVCSW), 0L);
         this.contextSwitches = voluntaryContextSwitches + nonVoluntaryContextSwitches;
         this.majorFaults = ParseUtil.parseLongOrDefault(threadMap.get(PsThreadColumns.MAJFLT), 0L);
         this.minorFaults = ParseUtil.parseLongOrDefault(threadMap.get(PsThreadColumns.MINFLT), 0L);
         this.priority = ParseUtil.parseIntOrDefault(threadMap.get(PsThreadColumns.PRI), 0);
         return true;
     }
 }