Carnac.Logic/KeyProvider.cs

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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reactive.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using Carnac.Logic.KeyMonitor;
using Carnac.Logic.Models;

namespace Carnac.Logic
{
    public class KeyProvider : IKeyProvider
    {
        private readonly IObservable<InterceptKeyEventArgs> interceptKeysSource;
        private readonly Dictionary<int, Process> processes;
        private readonly IPasswordModeService passwordModeService;
        private readonly IList<Keys> modifierKeys =
            new List<Keys>
                {
                    Keys.LControlKey,
                    Keys.RControlKey,
                    Keys.LShiftKey,
                    Keys.RShiftKey,
                    Keys.LMenu,
                    Keys.RMenu,
                    Keys.ShiftKey,
                    Keys.Shift,
                    Keys.Alt,
                    Keys.LWin,
                    Keys.RWin
                };

        private bool winKeyPressed;

        [DllImport("User32.dll")]
        private static extern int GetForegroundWindow();

        [DllImport("user32.dll")]
        private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

        public KeyProvider(IObservable<InterceptKeyEventArgs> interceptKeysSource, IPasswordModeService passwordModeService)
        {
            processes = new Dictionary<int, Process>();
            this.interceptKeysSource = interceptKeysSource;
            this.passwordModeService = passwordModeService;
        }

        public IDisposable Subscribe(IObserver<KeyPress> observer)
        {
            return interceptKeysSource
                .Select(DetectWindowsKey)
                .Where(k => !IsModifierKeyPress(k) && k.KeyDirection == KeyDirection.Down)
                .Select(ToCarnacKeyPress)
                .Where(k => !passwordModeService.CheckPasswordMode(k.InterceptKeyEventArgs))
                .Subscribe(observer);
        }

        private InterceptKeyEventArgs DetectWindowsKey(InterceptKeyEventArgs interceptKeyEventArgs)
        {
            if (interceptKeyEventArgs.Key == Keys.LWin || interceptKeyEventArgs.Key == Keys.RWin)