using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace TimerAndWorker
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private readonly int RECURSIVE_COUNT = 10000;

        private DispatcherTimer _timer;

        public MainWindow()
        {
            InitializeComponent();
            InitInstance();
        }

        private void InitInstance()
        {
            _timer = new DispatcherTimer();
            _timer.Interval = TimeSpan.FromMilliseconds(1);
            _timer.Tick += _timer_Tick;
            _timer.Start();
        }

        private void _timer_Tick(object? sender, EventArgs e)
        {
            lblTime.Content = DateTime.Now.ToString("HH:mm:ss.fff");
        }

        private void btnSyncCalc_Click(object sender, RoutedEventArgs e)
        {
            pbCalcProcess.Value = 0;
            lbResult.Items.Clear();

            int result = 0;
            for (int i = 0; i < RECURSIVE_COUNT; i++)
            {
                if (i % 7 == 0)
                {
                    lbResult.Items.Add(i);
                    lbResult.SelectedIndex = lbResult.Items.Count - 1;
                    lbResult.ScrollIntoView(lbResult.SelectedItem);
                    result++;
                }

                Thread.Sleep(1);
                pbCalcProcess.Value = Convert.ToInt32((double)i / RECURSIVE_COUNT * 100);
            }

            MessageBox.Show($"Numbers between 0 and {RECURSIVE_COUNT} divisable by 7: {result}");
        }

        private void btnAsyncCalc_Click(object sender, RoutedEventArgs e)
        {
            pbCalcProcess.Value = 0;
            lbResult.Items.Clear();

            BackgroundWorker worker = new BackgroundWorker();
            worker.WorkerReportsProgress = true;
            worker.DoWork += Worker_DoWork;
            worker.ProgressChanged += Worker_ProgressChanged;
            worker.RunWorkerCompleted += Worker_RunWorkerCompleted;
            worker.RunWorkerAsync(RECURSIVE_COUNT);
        }

        private void Worker_RunWorkerCompleted(object? sender, RunWorkerCompletedEventArgs e)
        {
            MessageBox.Show($"Numbers between 0 and {RECURSIVE_COUNT} divisable by 7: {e.Result}");
        }

        private void Worker_ProgressChanged(object? sender, ProgressChangedEventArgs e)
        {
            pbCalcProcess.Value = e.ProgressPercentage;
            if (e.UserState != null)
            {
                lbResult.Items.Add(e.UserState);
                lbResult.SelectedIndex = lbResult.Items.Count - 1;
                lbResult.ScrollIntoView(lbResult.SelectedItem);
            }
        }

        private void Worker_DoWork(object? sender, DoWorkEventArgs e)
        {
            int max = (int)e.Argument;
            int result = 0;
            for (int i = 0; i < max; i++)
            {
                int progressPercentage = Convert.ToInt32((double)i / RECURSIVE_COUNT * 100);
                if (i % 7 == 0)
                {
                    result++;
                    (sender as BackgroundWorker)?.ReportProgress(progressPercentage, i);
                }
                else
                    (sender as BackgroundWorker)?.ReportProgress(progressPercentage);

                Thread.Sleep(1);
            }

            e.Result = result;
        }
    }
}