/*
    * Copyright 2021-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.hardware.platform.unix.openbsd;
   
   import java.util.ArrayList;
   import java.util.Collections;
   import java.util.List;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import oshi.annotation.concurrent.Immutable;
  import oshi.hardware.GraphicsCard;
  import oshi.hardware.common.AbstractGraphicsCard;
  import oshi.util.Constants;
  import oshi.util.ExecutingCommand;
  
  /**
   * Graphics Card info obtained from pciconf
   */
  @Immutable
  final class OpenBsdGraphicsCard extends AbstractGraphicsCard {
  
      private static final String PCI_CLASS_DISPLAY = "Class: 03 Display";
      private static final Pattern PCI_DUMP_HEADER = Pattern.compile(" \\d+:\\d+:\\d+: (.+)");
  
      /**
       * Constructor for OpenBsdGraphicsCard
       *
       * @param name        The name
       * @param deviceId    The device ID
       * @param vendor      The vendor
       * @param versionInfo The version info
       * @param vram        The VRAM
       */
      OpenBsdGraphicsCard(String name, String deviceId, String vendor, String versionInfo, long vram) {
          super(name, deviceId, vendor, versionInfo, vram);
      }
  
      /**
       * public method used by {@link oshi.hardware.common.AbstractHardwareAbstractionLayer} to access the graphics cards.
       *
       * @return List of {@link oshi.hardware.platform.unix.freebsd.OpenBsdGraphicsCard} objects.
       */
      public static List<GraphicsCard> getGraphicsCards() {
          List<GraphicsCard> cardList = new ArrayList<>();
          // Enumerate all devices and add if required
          List<String> devices = ExecutingCommand.runNative("pcidump -v");
          if (devices.isEmpty()) {
              return Collections.emptyList();
          }
          String name = "";
          String vendorId = "";
          String productId = "";
          boolean classCodeFound = false;
          String versionInfo = "";
          for (String line : devices) {
              Matcher m = PCI_DUMP_HEADER.matcher(line);
              if (m.matches()) {
                  // Identifies start of a new device. Save previous if it's a graphics card
                  if (classCodeFound) {
                      cardList.add(new OpenBsdGraphicsCard(name.isEmpty() ? Constants.UNKNOWN : name,
                              productId.isEmpty() ? "0x0000" : productId, vendorId.isEmpty() ? "0x0000" : vendorId,
                              versionInfo.isEmpty() ? Constants.UNKNOWN : versionInfo, 0L));
                  }
                  // Device name is the captured pattern
                  name = m.group(1);
                  // Reset values
                  vendorId = "";
                  productId = "";
                  classCodeFound = false;
                  versionInfo = "";
              } else {
                  int idx;
                  // Look for:
                  // 0x0000: Vendor ID: 1ab8, Product ID: 4005
                  // 0x0008: Class: 03 Display, Subclass: 00 VGA
                  // ....... Interface: 00, Revision: 00
                  if (!classCodeFound) {
                      idx = line.indexOf("Vendor ID: ");
                      if (idx >= 0 && line.length() >= idx + 15) {
                          vendorId = "0x" + line.substring(idx + 11, idx + 15);
                      }
                      idx = line.indexOf("Product ID: ");
                      if (idx >= 0 && line.length() >= idx + 16) {
                          productId = "0x" + line.substring(idx + 12, idx + 16);
                      }
                      if (line.contains(PCI_CLASS_DISPLAY)) {
                          classCodeFound = true;
                      }
                  } else if (versionInfo.isEmpty()) {
                      idx = line.indexOf("Revision: ");
                      if (idx >= 0) {
                          versionInfo = line.substring(idx);
                      }
                  }
              }
          }
         // In case we reached end before saving
         if (classCodeFound) {
             cardList.add(new OpenBsdGraphicsCard(name.isEmpty() ? Constants.UNKNOWN : name,
                     productId.isEmpty() ? "0x0000" : productId, vendorId.isEmpty() ? "0x0000" : vendorId,
                     versionInfo.isEmpty() ? Constants.UNKNOWN : versionInfo, 0L));
         }
         return cardList;
     }
 }