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

namespace NetMonitorServer
{
    class SetNetworks
    {
        UdpClient net_send = new UdpClient();
        IPEndPoint net_send_port = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 34524);
            
        public SetNetworks(string data)
        {
            if (data.Substring(0, 8).ToLower() == "net auto")
                this.setNetworkAuto(data);
            if (data.Substring(0, 6).ToLower() == "net ip")
                this.setNetworkIp(data);
            if (data.Substring(0, 7).ToLower() == "net dns")
                this.setNetworkDns(data);
            if (data.Substring(0, 8).ToLower() == "net wins")
                this.setNetworkWins(data);
        }

        private void setNetworkWins(string data)
        {
            String[] par = data.Split(' ');
            if (par.Length != 4)
                return;
            bool ret;
            if (par[2].ToLower() == "auto")
                ret = this.runProgramNetsh("interface ipv4 set winsservers name=\"" + par[3] + "\" source=dhcp");
            else
                ret = this.runProgramNetsh("interface ipv4 set winsservers \"" + par[3] + "\" static " + par[2]);
            byte[] answ = Encoding.UTF8.GetBytes(ret.ToString());
            net_send.Send(answ, answ.Length, net_send_port);
        }

        private void setNetworkDns(string data)
        {
            String[] par = data.Split(' ');
            if (par.Length != 4)
                return;
            bool ret;
            if (par[2].ToLower() == "auto")
                ret = this.runProgramNetsh("interface ipv4 set dnsservers name=\"" + par[3] + "\" source=dhcp");
            else
                ret = this.runProgramNetsh("interface ipv4 set dnsservers \"" + par[3] + "\" static " + par[2] + " primary");
            byte[] answ = Encoding.UTF8.GetBytes(ret.ToString());
            net_send.Send(answ, answ.Length, net_send_port);
        }

        private void setNetworkIp(string data)
        {
            String[] par = data.Split(' ');
            if (par.Length != 4 && par.Length != 6)
                return;
            bool ret;
            if (par[2].ToLower() == "auto")
                ret = this.runProgramNetsh("interface ipv4 set address name=\"" + par[3] + "\" source=dhcp");
            else
                ret = this.runProgramNetsh("interface ipv4 set address \"" + par[5] + "\" static " + par[2] + " " + par[3] + " " + par[4]);
            byte[] answ = Encoding.UTF8.GetBytes(ret.ToString());
            net_send.Send(answ, answ.Length, net_send_port);
        }

        private void setNetworkAuto(string data)
        {
            String[] par = data.Split(' ');
            if (par.Length != 3)
                return;
            byte[] answ;
            if (this.runProgramNetsh("interface ipv4 set address name=\"" + par[2] + "\" source=dhcp") &&
                this.runProgramNetsh("interface ipv4 set dnsservers name=\"" + par[2] + "\" source=dhcp") &&
                this.runProgramNetsh("interface ipv4 set winsservers name=\"" + par[2] + "\" source=dhcp"))
                answ = Encoding.UTF8.GetBytes(true.ToString());
            else
                answ = Encoding.UTF8.GetBytes(false.ToString());
            net_send.Send(answ, answ.Length, net_send_port);
        }

        private bool runProgramNetsh(string args)
        {
            Process p = new Process();
            p.StartInfo.Arguments = args;
            p.StartInfo.FileName = "netsh";
            p.StartInfo.CreateNoWindow = true;
            p.StartInfo.RedirectStandardOutput = true; 
            p.StartInfo.UseShellExecute = false; 
            p.Start();
            string output = p.StandardOutput.ReadToEnd(); 
            p.WaitForExit();
            Console.WriteLine(output.Trim());
            if (p.ExitCode == 0)
                return true;
            return false;
        }
    }
}