using System;
using System.IO;
using System.Net.NetworkInformation;
using System.Reflection;
using System.Threading;
using AppIndicator3;
using Gtk;
using MelonVPNClient;
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 Indicator trayIcon;
    private PopupMenu trayMenu;
    private bool ConnectedToVPN;
    private bool IsHidden;
    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();

        trayMenu = new PopupMenu(OnActivateTrayIcon, OnToggleMenuItem, QuitApp);
        trayIcon = new Indicator("melonvpn", "MiniMelonVPNIcon", (int)IndicatorCategory.ApplicationStatus)
        {
            Menu = trayMenu.GetMenu(),
            Status = (int)IndicatorStatus.Active
        };
    }

    private void OnActivateTrayIcon()
    {
        if (IsHidden) JumpFromTray();
        else SendToTray();
    }

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

    void UpdateTrayMenu()
    {
        if (trayMenu != null) trayMenu.Update(ConnectedToVPN, !IsHidden);
    }

    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 = file.Replace(".png", "");
        }
    }

    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);
        UpdateTrayMenu();
        NotifyStateUpdate(oldState, ConnectedToVPN);
    }

    void NotifyStateUpdate(bool old, bool current)
    {
        if (old != current)
        {
            string msg = (current ? "Connected to" : "Disconnected from") + " the VPN";
            string icon = "/usr/lib/melon-vpn/MiniMelonVPN" + (current ? "Online" : "Icon") + ".png";
            Notification pop = new Notification("Melon VPN", msg, icon);
            pop.Show();
            CloseNotificationAfterWait(pop, 1000);
        }
    }

    void CloseNotificationAfterWait(Notification pop, int timeout)
    {
        // Close the notification after a wait
        // so it doesn't hang around
        Thread wait = new Thread(() =>
        {
            Thread.Sleep(timeout);
            pop.Close();
        })
        {
            IsBackground = true
        };
        wait.Start();
    }

    void SendToTray()
    {
        IsHidden = true;

        // Try hiding the window
        Iconify();
        SkipPagerHint = true;
        SkipTaskbarHint = true;

        // Changing the visible property needs to be
        // delayed for the window to start minimizing
        Thread thread = new Thread(() =>
        {
            Thread.Sleep(100);
            Visible = false;
        })
        {
            IsBackground = true
        };
        thread.Start();

        UpdateTrayMenu();
    }

    void JumpFromTray()
    {
        IsHidden = false;

        // Present triggers `Visible = true;`
        // it is then called again once the window is visible
        // so it triggers `Deiconify();`
        Present();
        SkipPagerHint = false;
        SkipTaskbarHint = false;

        UpdateTrayMenu();
    }

    protected void OnDeleteEvent(object sender, DeleteEventArgs a)
    {
        // Try to prevent destroying the tray icon
        // while connected to VPN
        if (ConnectedToVPN) SendToTray();
        else QuitApp();
        a.RetVal = true;
    }

    protected void QuitApp()
    {
        // Kill this thread if it exists
        if (wrapper != null)
        {
            wrapper.Kill();
            wrapper.Join();
        }

        // Destroy the tray icon first
        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();

    protected void OnVisibilityNotifyEvent(object o, VisibilityNotifyEventArgs args)
    {
        // Calling present again forces the window to `Deiconify();`
        Thread thread = new Thread(() =>
        {
            Thread.Sleep(100);
            Present();
        })
        {
            IsBackground = true
        };
        thread.Start();
    }
}