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package com.github.jnoee.xo.utils;

import java.net.NetworkInterface;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import com.github.jnoee.xo.exception.SysException;

/**
 * 硬件相关工具类。
 */
public class HardwareUtils {
  /**
   * 获取当前机器所有MAC地址列表。
   * 
   * @return 返回当前机器所有MAC地址列表。
   */
  public static List getAllMac() {
    List macs = new ArrayList<>();
    try {
      Enumeration networkInterfaces = NetworkInterface.getNetworkInterfaces();
      while (networkInterfaces.hasMoreElements()) {
        NetworkInterface networkInterface = networkInterfaces.nextElement();
        byte[] macBytes = networkInterface.getHardwareAddress();
        if (macBytes != null) {
          String mac = byteToMac(macBytes);
          macs.add(mac);
        }
      }
    } catch (Exception e) {
      throw new SysException("获取MAC地址时发生异常", e);
    }
    return macs;
  }

  /**
   * 将MAC地址字节数组转成字符串。
   * 
   * @param macBytes MAC地址字节数组
   * @return 返回MAC地址字符串。
   */
  private static String byteToMac(byte[] macBytes) {
    StringBuilder builder = new StringBuilder();
    for (byte macByte : macBytes) {
      String macStr = "00" + Integer.toHexString(macByte);
      macStr = macStr.substring(macStr.length() - 2).toUpperCase();
      builder.append("-");
      builder.append(macStr);
    }
    String mac = builder.toString();
    mac = mac.substring(1);
    return mac;
  }

  /**
   * 私有构造方法。
   */
  private HardwareUtils() {}
}