/*
    * Copyright 2021-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.hardware.platform.unix.openbsd;
   
   import java.util.ArrayList;
   import java.util.HashMap;
   import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import oshi.annotation.concurrent.Immutable;
  import oshi.hardware.SoundCard;
  import oshi.hardware.common.AbstractSoundCard;
  import oshi.util.ExecutingCommand;
  
  /**
   * OpenBSD soundcard.
   */
  @Immutable
  final class OpenBsdSoundCard extends AbstractSoundCard {
  
      private static final Pattern AUDIO_AT = Pattern.compile("audio\\d+ at (.+)");
      private static final Pattern PCI_AT = Pattern
              .compile("(.+) at pci\\d+ dev \\d+ function \\d+ \"(.*)\" (rev .+):.*");
  
      /**
       * Constructor for OpenBsdSoundCard.
       *
       * @param kernelVersion The version
       * @param name          The name
       * @param codec         The codec
       */
      OpenBsdSoundCard(String kernelVersion, String name, String codec) {
          super(kernelVersion, name, codec);
      }
  
      /**
       * <p>
       * getSoundCards.
       * </p>
       *
       * @return a {@link java.util.List} object.
       */
      public static List<SoundCard> getSoundCards() {
          List<String> dmesg = ExecutingCommand.runNative("dmesg");
          // Iterate dmesg once to collect location of audioN
          Set<String> names = new HashSet<>();
          for (String line : dmesg) {
              Matcher m = AUDIO_AT.matcher(line);
              if (m.matches()) {
                  names.add(m.group(1));
              }
          }
          // Iterate again and add cards when they match the name
          Map<String, String> nameMap = new HashMap<>();
          Map<String, String> codecMap = new HashMap<>();
          Map<String, String> versionMap = new HashMap<>();
          String key = "";
          for (String line : dmesg) {
              Matcher m = PCI_AT.matcher(line);
              if (m.matches() && names.contains(m.group(1))) {
                  key = m.group(1);
                  nameMap.put(key, m.group(2));
                  versionMap.put(key, m.group(3));
              } else if (!key.isEmpty()) {
                  // Codec is on the next line
                  int idx = line.indexOf("codec");
                  if (idx >= 0) {
                      idx = line.indexOf(':');
                      codecMap.put(key, line.substring(idx + 1).trim());
                  }
                  // clear key so we don't keep looking
                  key = "";
              }
          }
          List<SoundCard> soundCards = new ArrayList<>();
          for (Entry<String, String> entry : nameMap.entrySet()) {
              soundCards.add(new OpenBsdSoundCard(versionMap.get(entry.getKey()), entry.getValue(),
                      codecMap.get(entry.getKey())));
          }
          return soundCards;
      }
  }