using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;

namespace DllEapFileUpload
{ 
    public class ArpTool
    {
        /// <summary>
        /// 获取ARP查询字符串
        /// </summary>
        /// <returns></returns>
        private static string GetARPResult()
        {
            Process p = null;
            string output = string.Empty;
            try
            {
                p = Process.Start(new ProcessStartInfo("arp", "-a")
                {
                    CreateNoWindow = true,
                    UseShellExecute = false,
                    RedirectStandardOutput = true
                });
                output = p.StandardOutput.ReadToEnd();
            }
            catch (Exception ex)
            {
                //throw new Exception("IPInfo: Error Retrieving 'arp -a' Results", ex);
                LogBLL.Err("IPInfo: Error Retrieving 'arp -a' Results", ex);
            }
            finally
            {
                if (p != null)
                {
                    p.Close();
                }
            }
            return output;
        }

        /// <summary>
        /// 获取IP地址与Mac地址对应数据表
        /// </summary>
        /// <returns>Mac-IP</returns>
        public static List<string[]> GetIPInfo()
        {
            try
            {
                var list = new List<string[]>();
                foreach (var arp in GetARPResult().Split(new char[] { '\n', '\r' }))
                {
                    if (!string.IsNullOrEmpty(arp))
                    {
                        var pieces = (from piece in arp.Split(new char[] { ' ', '\t' })
                                      where !string.IsNullOrEmpty(piece)
                                      select piece).ToArray();
                        if (pieces.Length == 3)
                        {
                            //pieces[1]Mac
                            //pieces[0]IP
                            list.Add(new string[2] { pieces[1], pieces[0] });
                        }
                    }
                }
                return list;
            }
            catch (Exception ex)
            {
                LogBLL.Err("IPInfo: Error Retrieving 'arp -a' Results", ex);
                return null;
                //throw new Exception("IPInfo: Error Parsing 'arp -a' results", ex);
            }
        }

        /// <summary>
        /// Mac地址转换为IP地址
        /// </summary>
        /// <param name="str">IP</param>
        /// <returns></returns>
        public static string GetIpFromMac(string str)
        {
            //str = str.Trim().ToString().Replace(":", "-");
            List<string[]> getipinfo = GetIPInfo();
            string ipinfo = (from ip in getipinfo
                          where ip[1].ToLowerInvariant() == str.ToLowerInvariant()
                          select ip[0]).FirstOrDefault();
            if (string.IsNullOrEmpty(ipinfo))
            {
                return  "";
            }
            else
            {
                return ipinfo.ToUpperInvariant();
            }
            
        }
    }
}