using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;

public class SystemInfoHelper
{
    /// <summary>
    /// 获取计算机用户名
    /// </summary>
    public static string GetComputerUserName()
    {
        return Environment.UserName;
    }

    /// <summary>
    /// 获取计算机名
    /// </summary>
    public static string GetComputerName()
    {
        return Environment.MachineName;
    }

    /// <summary>
    /// 获取所有MAC地址
    /// </summary>
    public static List<string> GetAllMacAddresses()
    {
        List<string> macAddresses = new List<string>();

        try
        {
            NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface ni in interfaces)
            {
                if (ni.OperationalStatus == OperationalStatus.Up &&
                    ni.NetworkInterfaceType != NetworkInterfaceType.Loopback)
                {
                    PhysicalAddress address = ni.GetPhysicalAddress();
                    if (address != null && address.ToString().Length > 0)
                    {
                        string mac = FormatMacAddress(address.ToString());
                        macAddresses.Add(mac);
                    }
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("获取MAC地址错误: " + ex.Message);
        }

        return macAddresses;
    }

    /// <summary>
    /// 获取第一个可用的MAC地址
    /// </summary>
    public static string GetFirstMacAddress()
    {
        var macAddresses = GetAllMacAddresses();
        return macAddresses.Count > 0 ? macAddresses[0] : string.Empty;
    }

    /// <summary>
    /// 获取所有IP地址（IPv4）
    /// </summary>
    public static List<string> GetAllIPAddresses()
    {
        List<string> ipAddresses = new List<string>();

        try
        {
            string hostName = Dns.GetHostName();
            IPAddress[] addresses = Dns.GetHostAddresses(hostName);

            foreach (IPAddress address in addresses)
            {
                if (address.AddressFamily == AddressFamily.InterNetwork) // IPv4
                {
                    ipAddresses.Add(address.ToString());
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("获取IP地址错误: " + ex.Message);
        }

        return ipAddresses;
    }

    /// <summary>
    /// 获取本地IP地址（排除127.0.0.1）
    /// </summary>
    public static string GetLocalIPAddress()
    {
        var ipAddresses = GetAllIPAddresses();
        foreach (string ip in ipAddresses)
        {
            if (ip != "127.0.0.1"
                && !ip.StartsWith("169.254.")
                && !ip.StartsWith("192.168.")) // 排除回环和APIPA地址
            {
                return ip;
            }
        }
        return ipAddresses.Count > 0 ? ipAddresses[0] : string.Empty;
    }

    /// <summary>
    /// 格式化MAC地址（添加-分隔符）
    /// </summary>
    private static string FormatMacAddress(string mac)
    {
        if (string.IsNullOrEmpty(mac) || mac.Length != 12)
            return mac;

        // 将 "001122AABBCC" 格式化为 "00-11-22-AA-BB-CC"
        return string.Format("{0}-{1}-{2}-{3}-{4}-{5}",
            mac.Substring(0, 2),
            mac.Substring(2, 2),
            mac.Substring(4, 2),
            mac.Substring(6, 2),
            mac.Substring(8, 2),
            mac.Substring(10, 2));
    }
    /// <summary>
    /// 获取所有系统信息
    /// </summary>
    public static Dictionary<string, object> GetAllSystemInfo()
    {
        return new Dictionary<string, object>
        {
            { "UserName", GetComputerUserName() },
            { "ComputerName", GetComputerName() },
            { "MACAddresses", GetAllMacAddresses() },
            { "FirstMACAddress", GetFirstMacAddress() },
            { "IPAddresses", GetAllIPAddresses() },
            { "LocalIPAddress", GetLocalIPAddress() },
            { "OSVersion", Environment.OSVersion.ToString() },
            { "SystemDirectory", Environment.SystemDirectory },
            { "ProcessorCount", Environment.ProcessorCount },
            { "CurrentTime", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") }
        };
    }
}