public partial class Form1 : Form
    {
        Timer timer;
        public bool b;
        public string mac;
        [DllImport(@"C:\Windows\winsxs\x86_microsoft-windows-i..tocolimplementation_31bf3856ad364e35_11.2.9600.17501_none_88153be5fe8d0559\wininet.dll")]
        public static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);
        public const int INTERNET_OPTION_SETTINGS_CHANGED = 39;
        public const int INTERNET_OPTION_REFRESH = 37;
        static bool settingsReturn, refreshReturn;
        public Form1()
        {
            InitializeComponent();
            fillcombo();
            startconf();
            NetworkChange.NetworkAvailabilityChanged += new NetworkAvailabilityChangedEventHandler(NetAvailability);
            button1.Visible = true;
        }

        private void startconf()
        {
            if (Properties.Settings.Default.autodtc == true)
            {
                textBox1.Visible = false;
                label2.Visible = false;
                comboBox1.Enabled = false;
                checkBox2.Checked = true;
                textBox1.Text = Properties.Settings.Default.mac;
            }
            else
            {
                textBox1.Visible = false;
                label2.Visible = false;
                checkBox2.Checked = false;
            }
        }

        private void checkBox2_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox2.Checked == true)
            {
                textBox1.Visible = true;
                comboBox1.Enabled = false;
                label2.Visible = true;
              //  comboBox1.Text = "Активировано автоопределение";
            }
            else
            {
                textBox1.Visible = false;
                label2.Visible = false;
                comboBox1.Enabled = true;
            }
            button1.Visible = true;
        } 
        
              
        public void fillcombo()
        {
            this.comboBox1.Items.Add("Работа");
            this.comboBox1.Items.Add("Без прокси");
            this.comboBox1.Text = "Работа";
        }

        
        public  void setpr()
        {
            RegistryKey registry = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", true);
            if (comboBox1.Text == "Работа")
            {
                registry.SetValue("ProxyEnable", 1);
                registry.SetValue("ProxyServer", "192.168.1.1:3128");
            }
            else
            {
                registry.SetValue("ProxyEnable", 0);
            }
            settingsReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);
            refreshReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);          
        }

        public void setprmac()
        {
            RegistryKey registry = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", true);
            if (b == true)
            {
                registry.SetValue("ProxyEnable", 1);
                registry.SetValue("ProxyServer", "192.168.1.1:3128");
            }
            else
            {
                registry.SetValue("ProxyEnable", 0);
            }
            settingsReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);
            refreshReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);    
        }

        void timer_Tick(object sender, EventArgs e)
        {
            NetAvailability();
        }

        void NetAvailability(object sender, NetworkAvailabilityEventArgs e)
        {
            //ManagementObjectSearcher searchProcedure = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapter WHERE NetConnectionId != NULL");

            ManagementObjectSearcher searchProcedure = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapter WHERE NetConnectionId != NULL");
            foreach (ManagementObject mo in searchProcedure.Get())
            {
                if (mo["MacAddress"].ToString() == "88:51:FB:C6:3C:4B")
                {
                    if (e.IsAvailable)
                    {
                        b = true; label3.Text = "mac найден, доступен";
                    }
                    else
                    {
                        b = false; label3.Text = "mac найден, не доступен";
                    }
                }
                else { label3.Text = "mac не найден"; }
                }
            }
        


        
        private void button1_Click(object sender, EventArgs e)
        {
            var key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run\", true);
            if (checkBox1.Checked == true)
            {
                key.SetValue("ProxySwitcher", Application.ExecutablePath);
            }
            else
            {
                try { key.DeleteValue("ProxySwitcher"); }
                catch (Exception ex) { } 
            }

            timer = new Timer();
            timer.Interval = 100;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();

            if (checkBox2.Checked == true) 
            {
                setprmac();
                Properties.Settings.Default.mac = textBox1.Text;
                Properties.Settings.Default.autodtc = true;
                Properties.Settings.Default.Save();
            }
            if (checkBox2.Checked == false)
            {
                setpr();            
                Properties.Settings.Default.mac = null;
                Properties.Settings.Default.autodtc = false;
                Properties.Settings.Default.Save();                
            }
            button1.Visible = false;
        }



        private void Form1_Deactivate(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized) 
            { 
                  this.ShowInTaskbar = false; 
                  notifyIcon1.Visible = true;
            }
        
        }

        private void notifyIcon1_Click(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                this.WindowState = FormWindowState.Normal;
                this.ShowInTaskbar = true;
                notifyIcon1.Visible = false;
            }
        }

        private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            button1.Visible = true;
        } 
        
    }