using Shadowsocks.Controller;
using Shadowsocks.Model;
using Shadowsocks.Properties;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ZXing;

namespace Shadowsocks.View
{
    public class MenuViewController
    {
        // yes this is just a menu view controller
        // when config form is closed, it moves away from RAM
        // and it should just do anything related to the config form
        
        private ShadowsocksController controller;
        private UpdateChecker updateChecker;

        private NotifyIcon _notifyIcon;
        private ContextMenu contextMenu1;

        private bool _isFirstRun;
        private MenuItem enableItem;
        private MenuItem AutoStartupItem;
        private MenuItem ShareOverLANItem;
        private MenuItem SeperatorItem;
        private MenuItem ConfigItem;
        private MenuItem ServersItem;
        private MenuItem globalModeItem;
        private MenuItem PACModeItem;
        private ConfigForm configForm;

        public MenuViewController(ShadowsocksController controller)
        {
            this.controller = controller;

            LoadMenu();

            controller.EnableStatusChanged += controller_EnableStatusChanged;
            controller.ConfigChanged += controller_ConfigChanged;
            controller.PACFileReadyToOpen += controller_PACFileReadyToOpen;
            controller.ShareOverLANStatusChanged += controller_ShareOverLANStatusChanged;
            controller.EnableGlobalChanged += controller_EnableGlobalChanged;
            controller.Errored += controller_Errored;
            controller.UpdatePACFromGFWListCompleted += controller_UpdatePACFromGFWListCompleted;
            controller.UpdatePACFromGFWListError += controller_UpdatePACFromGFWListError;

            _notifyIcon = new NotifyIcon();
            UpdateTrayIcon();
            _notifyIcon.Visible = true;
            _notifyIcon.ContextMenu = contextMenu1;
            _notifyIcon.MouseDoubleClick += notifyIcon1_DoubleClick;

            this.updateChecker = new UpdateChecker();
            updateChecker.NewVersionFound += updateChecker_NewVersionFound;

            LoadCurrentConfiguration();

            updateChecker.CheckUpdate();

            if (controller.GetConfiguration().isDefault)
            {
                _isFirstRun = true;
                ShowConfigForm();
            }
        }

        void controller_Errored(object sender, System.IO.ErrorEventArgs e)
        {
            MessageBox.Show(e.GetException().ToString(), String.Format(I18N.GetString("Shadowsocks Error: {0}"), e.GetException().Message));
        }

        private void UpdateTrayIcon()
        {
            int dpi;
            Graphics graphics = Graphics.FromHwnd(IntPtr.Zero);
            dpi = (int)graphics.DpiX;
            graphics.Dispose();
            Bitmap icon = null;
            if (dpi < 97)
            {
                // dpi = 96;
                icon = Resources.ss16;
            }
            else if (dpi < 121)
            {
                // dpi = 120;
                icon = Resources.ss20;
            }
            else
            {
                icon = Resources.ss24;
            }
            bool enabled = controller.GetConfiguration().enabled;
            if (!enabled)
            {
                Bitmap iconCopy = new Bitmap(icon);
                for (int x = 0; x < iconCopy.Width; x++)
                {
                    for (int y = 0; y < iconCopy.Height; y++)
                    {
                        Color color = icon.GetPixel(x, y);
                        iconCopy.SetPixel(x, y , Color.FromArgb((byte)(color.A / 1.25), color.R, color.G, color.B));
                    }
                }
                icon = iconCopy;
            }
            _notifyIcon.Icon = Icon.FromHandle(icon.GetHicon());

            string text = I18N.GetString("Shadowsocks") + " " + UpdateChecker.Version + "\n" + (enabled ? I18N.GetString("Enabled") : I18N.GetString("Disabled")) + "\n" + controller.GetCurrentServer().FriendlyName();
            _notifyIcon.Text = text.Substring(0, Math.Min(63, text.Length));
        }

        private MenuItem CreateMenuItem(string text, EventHandler click)
        {
            return new MenuItem(I18N.GetString(text), click);
        }

        private MenuItem CreateMenuGroup(string text, MenuItem[] items)
        {
            return new MenuItem(I18N.GetString(text), items);
        }

        private void LoadMenu()
        {
            this.contextMenu1 = new ContextMenu(new MenuItem[] {
                this.enableItem = CreateMenuItem("Enable", new EventHandler(this.EnableItem_Click)),
                CreateMenuGroup("Mode", new MenuItem[] {
                    this.PACModeItem = CreateMenuItem("PAC", new EventHandler(this.PACModeItem_Click)),
                    this.globalModeItem = CreateMenuItem("Global", new EventHandler(this.GlobalModeItem_Click))
                }),
                this.ServersItem = CreateMenuGroup("Servers", new MenuItem[] {
                    this.SeperatorItem = new MenuItem("-"),
                    this.ConfigItem = CreateMenuItem("Edit Servers...", new EventHandler(this.Config_Click)),
                    CreateMenuItem("Show QRCode...", new EventHandler(this.QRCodeItem_Click)),
                    CreateMenuItem("Scan QRCode from Screen...", new EventHandler(this.ScanQRCodeItem_Click))
                }),
                new MenuItem("-"),
                this.AutoStartupItem = CreateMenuItem("Start on Boot", new EventHandler(this.AutoStartupItem_Click)),
                this.ShareOverLANItem = CreateMenuItem("Share over LAN", new EventHandler(this.ShareOverLANItem_Click)),
                CreateMenuItem("Edit PAC File...", new EventHandler(this.EditPACFileItem_Click)),
                CreateMenuItem("Update PAC from GFWList", new EventHandler(this.UpdatePACFromGFWListItem_Click)),
                new MenuItem("-"),
                CreateMenuItem("Show Logs...", new EventHandler(this.ShowLogItem_Click)),
                CreateMenuItem("About...", new EventHandler(this.AboutItem_Click)),
                new MenuItem("-"),
                CreateMenuItem("Quit", new EventHandler(this.Quit_Click))
            });
        }

        private void controller_ConfigChanged(object sender, EventArgs e)
        {
            LoadCurrentConfiguration();
            UpdateTrayIcon();
        }

        private void controller_EnableStatusChanged(object sender, EventArgs e)
        {
            enableItem.Checked = controller.GetConfiguration().enabled;
        }

        void controller_ShareOverLANStatusChanged(object sender, EventArgs e)
        {
            ShareOverLANItem.Checked = controller.GetConfiguration().shareOverLan;
        }

        void controller_EnableGlobalChanged(object sender, EventArgs e)
        {
            globalModeItem.Checked = controller.GetConfiguration().global;
            PACModeItem.Checked = !globalModeItem.Checked;
        }

        void controller_PACFileReadyToOpen(object sender, ShadowsocksController.PathEventArgs e)
        {
            string argument = @"/select, " + e.Path;

            System.Diagnostics.Process.Start("explorer.exe", argument);
        }

        void ShowBalloonTip(string title, string content, ToolTipIcon icon, int timeout)
        {
            _notifyIcon.BalloonTipTitle = title;
            _notifyIcon.BalloonTipText = content;
            _notifyIcon.BalloonTipIcon = icon;
            _notifyIcon.ShowBalloonTip(timeout);
        }

        void controller_UpdatePACFromGFWListError(object sender, System.IO.ErrorEventArgs e)
        {
            ShowBalloonTip(I18N.GetString("Failed to update PAC file"), e.GetException().Message, ToolTipIcon.Error, 5000);
            Logging.LogUsefulException(e.GetException());
        }

        void controller_UpdatePACFromGFWListCompleted(object sender, EventArgs e)
        {
            ShowBalloonTip(I18N.GetString("Shadowsocks"), I18N.GetString("PAC updated"), ToolTipIcon.Info, 1000);
        }

        void updateChecker_NewVersionFound(object sender, EventArgs e)
        {
            ShowBalloonTip(String.Format(I18N.GetString("Shadowsocks {0} Update Found"), updateChecker.LatestVersionNumber), I18N.GetString("Click here to download"), ToolTipIcon.Info, 5000);
            _notifyIcon.BalloonTipClicked += notifyIcon1_BalloonTipClicked;
            _isFirstRun = false;
        }

        void notifyIcon1_BalloonTipClicked(object sender, EventArgs e)
        {
            System.Diagnostics.Process.Start(updateChecker.LatestVersionURL);
            _notifyIcon.BalloonTipClicked -= notifyIcon1_BalloonTipClicked;
        }


        private void LoadCurrentConfiguration()
        {
            Configuration config = controller.GetConfiguration();
            UpdateServersMenu();
            enableItem.Checked = config.enabled;
            globalModeItem.Checked = config.global;
            PACModeItem.Checked = !config.global;
            ShareOverLANItem.Checked = config.shareOverLan;
            AutoStartupItem.Checked = AutoStartup.Check();
        }

        private void UpdateServersMenu()
        {
            var items = ServersItem.MenuItems;
            while (items[0] != SeperatorItem)
            {
                items.RemoveAt(0);
            }

            Configuration configuration = controller.GetConfiguration();
            for (int i = 0; i < configuration.configs.Count; i++)
            {
                Server server = configuration.configs[i];
                MenuItem item = new MenuItem(server.FriendlyName());
                item.Tag = i;
                item.Click += AServerItem_Click;
                items.Add(i, item);
            }

            if (configuration.index >= 0 && configuration.index < configuration.configs.Count)
            {
                items[configuration.index].Checked = true;
            }
        }

        private void ShowConfigForm()
        {
            if (configForm != null)
            {
                configForm.Activate();
            }
            else
            {
                configForm = new ConfigForm(controller);
                configForm.Show();
                configForm.FormClosed += configForm_FormClosed;
            }
        }

        void configForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            configForm = null;
            Util.Utils.ReleaseMemory();
            ShowFirstTimeBalloon();
        }

        private void Config_Click(object sender, EventArgs e)
        {
            ShowConfigForm();
        }

        private void Quit_Click(object sender, EventArgs e)
        {
            controller.Stop();
            _notifyIcon.Visible = false;
            Application.Exit();
        }

        private void ShowFirstTimeBalloon()
        {
            if (_isFirstRun)
            {
                _notifyIcon.BalloonTipTitle = I18N.GetString("Shadowsocks is here");
                _notifyIcon.BalloonTipText =  I18N.GetString("You can turn on/off Shadowsocks in the context menu");
                _notifyIcon.BalloonTipIcon = ToolTipIcon.Info;
                _notifyIcon.ShowBalloonTip(0);
                _isFirstRun = false;
            }
        }

        private void AboutItem_Click(object sender, EventArgs e)
        {
            Process.Start("https://github.com/shadowsocks/shadowsocks-csharp");
        }

        private void notifyIcon1_DoubleClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ShowConfigForm();
            }
        }

        private void EnableItem_Click(object sender, EventArgs e)
        {
            controller.ToggleEnable(!enableItem.Checked);
        }

        private void GlobalModeItem_Click(object sender, EventArgs e)
        {
            controller.ToggleGlobal(true);
        }

        private void PACModeItem_Click(object sender, EventArgs e)
        {
            controller.ToggleGlobal(false);
        }

        private void ShareOverLANItem_Click(object sender, EventArgs e)
        {
            ShareOverLANItem.Checked = !ShareOverLANItem.Checked;
            controller.ToggleShareOverLAN(ShareOverLANItem.Checked);
        }

        private void EditPACFileItem_Click(object sender, EventArgs e)
        {
            controller.TouchPACFile();
        }

        private void UpdatePACFromGFWListItem_Click(object sender, EventArgs e)
        {
            controller.UpdatePACFromGFWList();
        }

        private void AServerItem_Click(object sender, EventArgs e)
        {
            MenuItem item = (MenuItem)sender;
            controller.SelectServerIndex((int)item.Tag);
        }

        private void ShowLogItem_Click(object sender, EventArgs e)
        {
            string argument = Logging.LogFile;

            System.Diagnostics.Process.Start("notepad.exe", argument);
        }

        private void QRCodeItem_Click(object sender, EventArgs e)
        {
            QRCodeForm qrCodeForm = new QRCodeForm(controller.GetQRCodeForCurrentServer());
            //qrCodeForm.Icon = this.Icon;
            // TODO
            qrCodeForm.Show();
        }

        private void ScanQRCodeItem_Click(object sender, EventArgs e)
        {

            using (Bitmap image = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
                                            Screen.PrimaryScreen.Bounds.Height))
            {
                using (Graphics g = Graphics.FromImage(image))
                {
                    g.CopyFromScreen(Screen.PrimaryScreen.Bounds.X,
                                     Screen.PrimaryScreen.Bounds.Y,
                                     0, 0,
                                     image.Size,
                                     CopyPixelOperation.SourceCopy);
                }
                var reader = new BarcodeReader
                {
                    TryHarder = true,
                    PossibleFormats = new List<BarcodeFormat>
                    {
                        BarcodeFormat.QR_CODE
                    }
                };
                var result = reader.Decode(image);
                if (result != null)
                {
                    var success = controller.AddServerBySSURL(result.Text);
                    if (success)
                    {
                        float minX = Int32.MaxValue, minY = Int32.MaxValue, maxX = 0, maxY = 0;
                        foreach (ResultPoint point in result.ResultPoints)
                        {
                            minX = Math.Min(minX, point.X);
                            minY = Math.Min(minY, point.Y);
                            maxX = Math.Max(maxX, point.X);
                            maxY = Math.Max(maxY, point.Y);
                        }
                        // make it 20% larger
                        float margin = (maxX - minX) * 0.20f;
                        minX -= margin;
                        maxX += margin;
                        minY -= margin;
                        maxY += margin;

                        QRCodeSplashForm splash = new QRCodeSplashForm();
                        splash.FormClosed += splash_FormClosed;
                        splash.Location = new Point((int)minX, (int)minY);
                        splash.Size = new Size((int)maxX - (int)minX, (int)maxY - (int)minY);
                        splash.Show();
                        return;
                    }
                }
                MessageBox.Show(I18N.GetString("Failed to scan QRCode"));
            }
        }

        void splash_FormClosed(object sender, FormClosedEventArgs e)
        {
            ShowConfigForm();
        }

		private void AutoStartupItem_Click(object sender, EventArgs e) {
			AutoStartupItem.Checked = !AutoStartupItem.Checked;
			if (!AutoStartup.Set(AutoStartupItem.Checked)) {
				MessageBox.Show("Failed to edit registry");
			}
		}
    }
}