/*
    * Copyright 2025 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.software.os.unix.aix;
   
   import oshi.software.os.ApplicationInfo;
   import oshi.util.Constants;
   import oshi.util.ExecutingCommand;
  import oshi.util.ParseUtil;
  
  import java.util.ArrayList;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Set;
  import java.util.Map;
  import java.util.LinkedHashMap;
  import java.util.regex.Pattern;
  
  public final class AixInstalledApps {
  
      private static final Pattern COLON_PATTERN = Pattern.compile(":");
  
      private AixInstalledApps() {
      }
  
      public static List<ApplicationInfo> queryInstalledApps() {
          // https://www.ibm.com/docs/en/aix/7.1.0?topic=l-lslpp-command
          List<String> output = ExecutingCommand.runNative("lslpp -Lc");
          return parseAixAppInfo(output);
      }
  
      private static List<ApplicationInfo> parseAixAppInfo(List<String> lines) {
          Set<ApplicationInfo> appInfoSet = new LinkedHashSet<>();
          String architecture = System.getProperty("os.arch");
          boolean isFirstLine = true;
          for (String line : lines) {
              if (isFirstLine) {
                  isFirstLine = false;
                  continue; // Skip the first line as it consists column names
              }
              /*
               * Sample output: (1) devices.chrp.IBM.lhca:devices.chrp.IBM.lhca.rte:7.1.5.30: : :C:F:Infiniband Logical
               * HCA Runtime Environment: : : : : : :0:0:/:1837 (2) bash:bash-5.0.18-1:5.0.18-1: : :C:R:The GNU Bourne
               * Again shell (bash) version 5.0.18: :/bin/rpm -e bash: : : : :0: :(none):Fri Sep 18 15:53:11 2020
               */
              // split by the colon character
              String[] parts = COLON_PATTERN.split(line, -1); // -1 to keep empty fields
              String name = ParseUtil.getStringValueOrUnknown(parts[0]);
              if (name.equals(Constants.UNKNOWN)) {
                  continue;
              }
              String version = ParseUtil.getStringValueOrUnknown(parts[2]);
              String vendor = Constants.UNKNOWN; // lslpp command does not provide vendor info, hence, assigning as
              // unknown
              // Build Date is of two formats YYWW and EEE MMM dd HH:mm:ss yyyy
              String buildDate = ParseUtil.getStringValueOrUnknown(parts[17]);
              long timestamp = 0;
              if (!buildDate.equals(Constants.UNKNOWN)) {
                  if (buildDate.matches("\\d{4}")) {
                      // Convert to ISO week date string (e.g., 1125 -> 2011-W25-2 for Monday)
                      String isoWeekString = "20" + buildDate.substring(0, 2) + "-W" + buildDate.substring(2) + "-2";
                      timestamp = ParseUtil.parseDateToEpoch(isoWeekString, "YYYY-'W'ww-e");
                  } else {
                      timestamp = ParseUtil.parseDateToEpoch(buildDate, "EEE MMM dd HH:mm:ss yyyy");
                  }
              }
              String description = ParseUtil.getStringValueOrUnknown(parts[7].trim());
              String installPath = ParseUtil.getStringValueOrUnknown(parts[16].trim());
              Map<String, String> additionalInfo = new LinkedHashMap<>();
              additionalInfo.put("architecture", architecture);
              additionalInfo.put("description", description);
              additionalInfo.put("installPath", installPath);
              ApplicationInfo app = new ApplicationInfo(name, version, vendor, timestamp, additionalInfo);
              appInfoSet.add(app);
          }
  
          return new ArrayList<>(appInfoSet);
      }
  }