content: /*
   ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
   ~                                                                               ~
   ~ The MIT License (MIT)                                                         ~
   ~                                                                               ~
   ~ Copyright (c) 2015-2025 miaixz.org OSHI and other contributors.               ~
   ~                                                                               ~
   ~ Permission is hereby granted, free of charge, to any person obtaining a copy  ~
   ~ of this software and associated documentation files (the "Software"), to deal ~
   ~ in the Software without restriction, including without limitation the rights  ~
   ~ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell     ~
   ~ copies of the Software, and to permit persons to whom the Software is         ~
   ~ furnished to do so, subject to the following conditions:                      ~
   ~                                                                               ~
   ~ The above copyright notice and this permission notice shall be included in    ~
   ~ all copies or substantial portions of the Software.                           ~
   ~                                                                               ~
   ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR    ~
   ~ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,      ~
   ~ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE   ~
   ~ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER        ~
   ~ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, ~
   ~ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN     ~
   ~ THE SOFTWARE.                                                                 ~
   ~                                                                               ~
   ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
  */
  package org.miaixz.bus.health.unix.driver;
  
  import java.time.LocalDateTime;
  import java.time.Year;
  import java.time.ZoneId;
  import java.time.format.DateTimeFormatter;
  import java.time.format.DateTimeFormatterBuilder;
  import java.time.format.DateTimeParseException;
  import java.time.temporal.ChronoField;
  import java.time.temporal.ChronoUnit;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Locale;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.miaixz.bus.core.lang.Normal;
  import org.miaixz.bus.core.lang.Symbol;
  import org.miaixz.bus.core.lang.annotation.ThreadSafe;
  import org.miaixz.bus.health.Executor;
  import org.miaixz.bus.health.builtin.software.OSSession;
  
  import com.sun.jna.Platform;
  
  /**
   * Utility to query logged in users.
   *
   * @author Kimi Liu
   * @since Java 17+
   */
  @ThreadSafe
  public final class Who {
  
      // sample format:
      // oshi pts/0 2020-05-14 21:23 (192.168.1.23)
      private static final Pattern WHO_FORMAT_LINUX = Pattern
              .compile("(\\S+)\\s+(\\S+)\\s+(\\d{4}-\\d{2}-\\d{2})\\s+(\\d{2}:\\d{2})\\s*(?:\\((.+)\\))?");
      private static final DateTimeFormatter WHO_DATE_FORMAT_LINUX = DateTimeFormatter
              .ofPattern("yyyy-MM-dd HH:mm", Locale.ROOT);
      // oshi ttys000 May 4 23:50 (192.168.1.23)
      // middle 12 characters from Thu Nov 24 18:22:48 1986
      private static final Pattern WHO_FORMAT_UNIX = Pattern
              .compile("(\\S+)\\s+(\\S+)\\s+(\\S+)\\s+(\\d+)\\s+(\\d{2}:\\d{2})\\s*(?:\\((.+)\\))?");
      private static final DateTimeFormatter WHO_DATE_FORMAT_UNIX = new DateTimeFormatterBuilder()
              .appendPattern("MMM d HH:mm").parseDefaulting(ChronoField.YEAR, Year.now(ZoneId.systemDefault()).getValue())
              .toFormatter(Locale.US);
  
      private Who() {
      }
  
      /**
       * Query {@code who} to get logged in users
       *
       * @return A list of logged in user sessions
       */
      public static synchronized List<OSSession> queryWho() {
          List<OSSession> whoList = new ArrayList<>();
          List<String> who = Executor.runNative("who");
          for (String s : who) {
              boolean matched = false;
              if (Platform.isLinux()) {
                  matched = matchLinux(whoList, s);
              }
              if (!matched) {
                  matchUnix(whoList, s);
              }
          }
          return whoList;
      }
  
      /**
       * Attempt to match Linux WHO format and add to the list
       *
       * @param whoList the list to add to
       * @param s       the string to match
       * @return true if successful, false otherwise
       */
      private static boolean matchLinux(List<OSSession> whoList, String s) {
          Matcher m = WHO_FORMAT_LINUX.matcher(s);
          if (m.matches()) {
              try {
                  whoList.add(
                          new OSSession(m.group(1), m.group(2),
                                  LocalDateTime.parse(m.group(3) + Symbol.SPACE + m.group(4), WHO_DATE_FORMAT_LINUX)
                                          .atZone(ZoneId.systemDefault()).toInstant().toEpochMilli(),
                                  m.group(5) == null ? Normal.UNKNOWN : m.group(5)));
                  return true;
              } catch (DateTimeParseException | NullPointerException e) {
                  // shouldn't happen if regex matches and OS is producing sensible dates
              }
          }
          return false;
      }
  
      /**
       * Attempt to match Unix WHO format and add to the list
       *
       * @param whoList the list to add to
       * @param s       the string to match
       * @return true if successful, false otherwise
       */
      private static boolean matchUnix(List<OSSession> whoList, String s) {
          Matcher m = WHO_FORMAT_UNIX.matcher(s);
          if (m.matches()) {
              try {
                  // Missing year, parse date time with current year
                  LocalDateTime login = LocalDateTime.parse(
                          m.group(3) + Symbol.SPACE + m.group(4) + Symbol.SPACE + m.group(5),
                          WHO_DATE_FORMAT_UNIX);
                  // If this date is in the future, subtract a year
                  if (login.isAfter(LocalDateTime.now(ZoneId.systemDefault()))) {
                      login = login.minus(1, ChronoUnit.YEARS);
                  }
                  long millis = login.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
                  whoList.add(
                          new OSSession(m.group(1), m.group(2), millis, m.group(6) == null ? Normal.EMPTY : m.group(6)));
                  return true;
              } catch (DateTimeParseException | NullPointerException e) {
                  // shouldn't happen if regex matches and OS is producing sensible dates
              }
          }
          return false;
      }
  
  }
  