using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace PrivacyGlass
{
    public class TrayApp : ApplicationContext
    {
        const uint MOD_ALT = 0x0001;
        const uint MOD_CONTROL = 0x0002;
        const uint HOTKEY_ID = 1;

        private NotifyIcon tray;
        private List<BlurOverlay> overlays = new List<BlurOverlay>();
        //private const int HOTKEY_ID = 100;

        [DllImport("user32.dll")]
        static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

        [DllImport("user32.dll")]
        static extern bool UnregisterHotKey(IntPtr hWnd, int id);

        private void RegisterGlobalHotKey()
        {
            // Ctrl + Alt + Space
            RegisterHotKey(
                IntPtr.Zero,
                (int)HOTKEY_ID,
                MOD_CONTROL | MOD_ALT,
                (uint)Keys.Space
            );
        }

        public TrayApp()
        {
            CreateTrayIcon();
            CreateOverlays();
            RegisterGlobalHotKey();
            Application.AddMessageFilter(new HotkeyFilter(Toggle));
        }


        private void CreateTrayIcon()
        {
            var assembly = Assembly.GetExecutingAssembly();
            using (Stream s = assembly.GetManifestResourceStream("PrivacyGlass.Resources.privacyglass.ico"))
            {

                Icon trayicon = new Icon(s);

                tray = new NotifyIcon()
                {
                    Text = "PrivacyCurtain",
                    Icon = trayicon,
                    Visible = true,
                    ContextMenuStrip = BuildMenu()
                };
            }
          
        }

        private ContextMenuStrip BuildMenu()
        {
            var menu = new ContextMenuStrip();

            menu.Items.Add("Toggle Now", null, (_, __) => Toggle());
            menu.Items.Add("Exit", null, Exit);

            return menu;
        }

        private void CreateOverlays()
        {
            foreach (var screen in Screen.AllScreens)
            {
                BlurOverlay ov = new BlurOverlay(screen.Bounds);
                ov.TintColor = Color.Black;
                ov.TintOpacity = 0;    // 0–255, higher = darker

                overlays.Add(ov);
            }
        }

        private void Toggle() =>
            overlays.ForEach(o => o.Toggle());

        private void Exit(object sender, EventArgs e)
        {
            UnregisterHotKey(IntPtr.Zero, (int)HOTKEY_ID);
            tray.Visible = false;
            Application.Exit();
        }

    }

}