Zzz – Rev 1

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Serilog;
using Zzz.Properties;
using Zzz.Utilities;

namespace Zzz.Idle
{
    public class WindowPresence : IDisposable
    {
        #region Public Events & Delegates

        public event EventHandler<EventArgs> WindowDetected;

        #endregion

        #region Private Delegates, Events, Enums, Properties, Indexers and Fields

        private readonly CancellationToken _cancellationToken;

        private readonly Task _scanTask;

        private CancellationTokenSource _cancellationTokenSource;
        private Configuration.Configuration _configuration;

        #endregion

        #region Constructors, Destructors and Finalizers

        public WindowPresence(Configuration.Configuration configuration) : this()
        {
            _configuration = configuration;
        }

        private WindowPresence()
        {
            _cancellationTokenSource = new CancellationTokenSource();
            _cancellationToken = _cancellationTokenSource.Token;

            _scanTask = Scan(_cancellationToken);
        }

        public void Dispose()
        {
            _cancellationTokenSource?.Cancel();

            _scanTask.Wait(CancellationToken.None);

            _cancellationTokenSource = null;
        }

        #endregion

        #region Private Methods

        private async Task Scan(CancellationToken cancellationToken)
        {
            try
            {
                do
                {
                    try
                    {
                        await Task.Delay(TimeSpan.FromMinutes((int) _configuration.Timeout), cancellationToken);

                        foreach (var title in RefreshWindows())
                        {
                            if (!_configuration.WindowsWatchList.Contains(title))
                            {
                                continue;
                            }

                            WindowDetected?.Invoke(this, EventArgs.Empty);
                        }
                    }
                    catch (Exception ex)
                    {
                        Log.Warning(ex, "Window scan failure.");
                    }
                } while (!cancellationToken.IsCancellationRequested);
            }
            catch (Exception ex)
            {
                Log.Warning(ex, "Window scan thread terminated.");
            }
        }

        private static IEnumerable<string> RefreshWindows()
        {
            return Helpers.FindWindows((window, param) => true).Select(Helpers.GetWindowTitle)
                .Where(title => !string.IsNullOrEmpty(title));
        }

        #endregion
    }
}

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