using System;
using System.IO;
using System.Net.NetworkInformation;
using System.Reflection;
using System.Threading;
using Gtk;
using MelonVPNCore;
using Notify;

public partial class MainWindow : Window
{
    private Label statusLabel;
    private Button startBtn;
    private Button stopBtn;
    private Button refreshBtn;
    private ScrolledWindow clientsListScroller;
    private TextView clientsListText;
    private Thread startupCheckThread;
    private ThreadWrapper wrapper;
    private StatusIcon trayIcon;
    private bool ConnectedToVPN;
    public static readonly string MelonIconImg = "MiniMelonVPNIcon.png";
    public static readonly string MelonOnlineImg = "MiniMelonVPNOnline.png";

    public MainWindow() : base(WindowType.Toplevel)
    {
        Build();

        Title = "Melon VPN";
        UpdateIcon(MelonIconImg);
        SetSizeRequest(300, 300);
        SetDefaultSize(300, 300);
        SetPosition(WindowPosition.CenterAlways);

        Resizable = false;
        TypeHint = Gdk.WindowTypeHint.Dialog;

        ShowAll();
        Present();

        statusLabel = new Label
        {
            Visible = true,
            Text = "Loading..."
        };
        fixed1.Put(statusLabel, 10, 10);

        startBtn = new Button
        {
            Visible = true,
            Label = "Start"
        };
        startBtn.SetSizeRequest(80, 30);
        startBtn.Clicked += OnStartClicked;
        fixed1.Put(startBtn, 10, 40);

        stopBtn = new Button
        {
            Visible = true,
            Label = "Stop"
        };
        stopBtn.SetSizeRequest(80, 30);
        stopBtn.Clicked += OnStopClicked;
        fixed1.Put(stopBtn, 100, 40);

        refreshBtn = new Button
        {
            Visible = true,
            Label = "Refresh"
        };
        refreshBtn.SetSizeRequest(80, 30);
        refreshBtn.Clicked += OnRefreshClicked;
        fixed1.Put(refreshBtn, 190, 40);

        clientsListText = new TextView
        {
            Visible = true,
            Editable = false
        };

        clientsListScroller = new ScrolledWindow
        {
            Visible = true
        };
        clientsListScroller.SetSizeRequest(280, 200);
        clientsListScroller.Add(clientsListText);
        fixed1.Put(clientsListScroller, 10, 80);

        GUISocketServer.Receive += delegate (object sender, ClientResponseState s)
        {
            Console.WriteLine(s);
            Application.Invoke(delegate
            {
                UpdateStatus(s);
            });
        };
        GUISocketServer.ClientListUpdate += delegate (object sender, ConnectedClient[] clients)
        {
            Console.WriteLine(clients.Length);
            string[][] a = new string[clients.Length][];
            for (int i = 0; i < clients.Length; i++) a[i] = new string[] { clients[i].name, clients[i].ip };
            clientsListText.Buffer.Text = GenerateTable(a);
        };
        wrapper = new ThreadWrapper(GUISocketServer.StartServer);

        startupCheckThread = new Thread(StartupCheckMethod)
        {
            IsBackground = true
        };
        startupCheckThread.Start();

        trayIcon = new StatusIcon
        {
            Visible = true,
            TooltipText = "Melon VPN"
        };
        trayIcon.Activate += OnActivateTrayIcon;
        trayIcon.PopupMenu += OnTrayIconPopup;
    }

    private void OnActivateTrayIcon(object sender, EventArgs args)
    {
        Visible = !Visible;
    }

    private void OnTrayIconPopup(object o, PopupMenuArgs args)
    {
        Menu popupMenu = new Menu();

        ImageMenuItem menuItemToggle = new ImageMenuItem(ConnectedToVPN ? "Disconnect" : "Connect");
        Image toggleimg = new Image(ConnectedToVPN ? Stock.MediaPause : Stock.MediaPlay);
        menuItemToggle.Image = toggleimg;
        popupMenu.Add(menuItemToggle);
        menuItemToggle.Activated += OnToggleMenuItem;

        ImageMenuItem menuItemQuit = new ImageMenuItem("Quit");
        Image appimg = new Image(Stock.Quit, IconSize.Menu);
        menuItemQuit.Image = appimg;
        popupMenu.Add(menuItemQuit);
        menuItemQuit.Activated += delegate { QuitApp(); };

        popupMenu.ShowAll();
        popupMenu.Popup();
    }

    void OnToggleMenuItem(object sender, EventArgs args)
    {
        if (ConnectedToVPN) OnStopClicked(this, new EventArgs());
        else OnStartClicked(this, new EventArgs());
    }

    void UpdateIcon(string file)
    {
        DirectoryInfo ExeLocation = Directory.GetParent(Assembly.GetEntryAssembly().Location);
        string IconPath = System.IO.Path.Combine(ExeLocation.FullName, file);
        Console.WriteLine("Trying to update icon to: " + IconPath);
        if (File.Exists(IconPath))
        {
            Icon = new Gdk.Pixbuf(IconPath);
            if (trayIcon != null) trayIcon.Icon = new Gdk.Pixbuf(IconPath);
        }
    }

    string GenerateTable(string[][] a)
    {
        if (a.Length == 0) return "";
        int maxlength = a[0][0].Length;
        foreach (string b in a[0])
        {
            if (b.Length > maxlength) maxlength = b.Length;
        }
        string[] c = new string[a.Length];
        for (int i = 0; i < a.Length; i++) c[i] = a[i][0].PadRight(maxlength, ' ') + a[i][1];
        return string.Join("\n", c);
    }

    string GetVpnInternalIp()
    {
        if (NetworkInterface.GetIsNetworkAvailable())
        {
            foreach (NetworkInterface f in NetworkInterface.GetAllNetworkInterfaces())
            {
                IPInterfaceProperties p = f.GetIPProperties();
                IPAddressInformationCollection addressesColl = p.AnycastAddresses;
                foreach (IPAddressInformation ip in addressesColl)
                {
                    if (ip.Address.ToString().StartsWith("10.137.248.", StringComparison.CurrentCulture))
                    {
                        return ip.Address.ToString();
                    }
                }
            }
        }
        return "";
    }

    void StartupCheckMethod()
    {
        ClientResponseState s = Client.SendDataMessage(DataMessage.Status);
        Console.WriteLine(s);
        Application.Invoke(delegate
        {
            UpdateStatus(s);
        });
    }

    void Refresh()
    {
        ClientResponseState s = Client.SendDataMessage(DataMessage.Status);
        switch (s)
        {
            case ClientResponseState.Error:
            case ClientResponseState.ServerError:
                UpdateStatus(s);
                MessageDialog md = new MessageDialog(this,
                    DialogFlags.DestroyWithParent, MessageType.Error,
                    ButtonsType.Ok, "Error stopping VPN. Is the daemon running?");
                md.Run();
                md.Destroy();
                break;
            case ClientResponseState.Online:
            case ClientResponseState.Offline:
                UpdateStatus(s);
                break;
        }
    }

    void UpdateStatus(ClientResponseState s)
    {
        bool oldState = ConnectedToVPN;
        switch (s)
        {
            case ClientResponseState.Error:
                statusLabel.Text = "Client Error";
                ConnectedToVPN = false;
                break;
            case ClientResponseState.ServerError:
                statusLabel.Text = "Server Error";
                ConnectedToVPN = false;
                break;
            case ClientResponseState.Blank:
                statusLabel.Text = "No reply";
                ConnectedToVPN = false;
                break;
            case ClientResponseState.Online:
                statusLabel.Text = "Online - " + GetVpnInternalIp();
                ConnectedToVPN = true;
                break;
            case ClientResponseState.Offline:
                statusLabel.Text = "Offline";
                ConnectedToVPN = false;
                break;
        }
        if (ConnectedToVPN) UpdateIcon(MelonOnlineImg);
        else UpdateIcon(MelonIconImg);
        NotifyStateUpdate(oldState,ConnectedToVPN);
    }

    void NotifyStateUpdate(bool old, bool current)
    {
        if(old!=current)
        {
            if(current==true)
            {
                Notification pop = new Notification("Melon VPN", "Connected to the VPN");
                pop.Show();
            }
            else
            {
                Notification pop = new Notification("Melon VPN", "Disconnected from the VPN");
                pop.Show();
            }
        }
    }

    protected void OnDeleteEvent(object sender, DeleteEventArgs a)
    {
        if (ConnectedToVPN) Visible = false;
        else QuitApp();
        a.RetVal = true;
    }

    protected void QuitApp()
    {
        if (wrapper != null)
        {
            wrapper.Kill();
            wrapper.Join();
        }
        if (trayIcon != null) trayIcon.Dispose();
        Application.Quit();
    }

    void OnStartClicked(object sender, EventArgs e)
    {
        ClientResponseState s = Client.SendDataMessage(DataMessage.Start);
        switch (s)
        {
            case ClientResponseState.Error:
            case ClientResponseState.ServerError:
            case ClientResponseState.Offline:
                UpdateStatus(s);
                MessageDialog md = new MessageDialog(this,
                    DialogFlags.DestroyWithParent, MessageType.Error,
                    ButtonsType.Ok, "Error starting VPN. Is the daemon running?");
                md.Run();
                md.Destroy();
                break;
        }
    }

    void OnStopClicked(object sender, EventArgs e)
    {
        ClientResponseState s = Client.SendDataMessage(DataMessage.Stop);
        switch (s)
        {
            case ClientResponseState.Error:
            case ClientResponseState.ServerError:
            case ClientResponseState.Online:
                UpdateStatus(s);
                MessageDialog md = new MessageDialog(this,
                    DialogFlags.DestroyWithParent, MessageType.Error,
                    ButtonsType.Ok, "Error stopping VPN. Is the daemon running?");
                md.Run();
                md.Destroy();
                break;
        }
    }

    void OnRefreshClicked(object sender, EventArgs e)
    {
        Refresh();
    }

    void OnViewClientsClicked(object sender, EventArgs e)
    {
        Refresh();
    }
}