CaptchaAndSimpleCalculator/CaptchaAndSimpleCalculator/ViewModels/AuthViewModel.cs

using System;
using System.Collections.Generic;
using Avalonia.Controls.Shapes;
using Avalonia.Controls;
using Avalonia.Media;
using Avalonia.Threading;
using Avalonia;
using ReactiveUI;

namespace CaptchaAndSimpleCalculator.ViewModels
{
	public class AuthViewModel : ReactiveObject
	{
       
        #region Ñâîéñòâà äëÿ ëîãèíà, ïàðîëÿ è ïðîâåðêà àâòîðèçàöèè
        string Lg;
        string Pw;
        string ChAuth;
        int erroneousAuth = 0;
        bool _TextBoxEnable = true;

        public bool TextBoxIsEnable { get => _TextBoxEnable; set => this.RaiseAndSetIfChanged(ref _TextBoxEnable, value); }

        public string Login { get => Lg; set => this.RaiseAndSetIfChanged(ref Lg, value); }

        public string Password { get => Pw; set => this.RaiseAndSetIfChanged(ref Pw, value); }
        
        public string CheckAuth { get => ChAuth; set => this.RaiseAndSetIfChanged(ref ChAuth, value); }

        public int ErroneousAuth { get => erroneousAuth; set => this.RaiseAndSetIfChanged(ref erroneousAuth, value); }       
        #endregion

        #region Ãåíåðàöèÿ êàï÷è

        Canvas _Captcha;

        public Canvas Captcha { get => _Captcha; set => this.RaiseAndSetIfChanged(ref _Captcha, value); }

        public char rndLet()
        {
            Random rnd = new Random();
            int randomIndex = rnd.Next(0, 26);
            char letter = (char)('a' + randomIndex);
            return letter;
        }

        #region Ñâîéñòâà è ïåðåìåííûå äëÿ ýëåìåíòîâ êàï÷è        

        bool _Button1Visible = true;
        bool _Button2Visible = false;
        bool _TextBoxVisible = false;

        public bool Button1IsVisible { get => _Button1Visible; set => this.RaiseAndSetIfChanged(ref _Button1Visible, value); }
        public bool Button2IsVisible { get => _Button2Visible; set => this.RaiseAndSetIfChanged(ref _Button2Visible, value); }
        public bool TextBoxISVisible { get => _TextBoxVisible; set => this.RaiseAndSetIfChanged(ref _TextBoxVisible, value); }

        string _Kod;
        public string Kod { get => _Kod; set => this.RaiseAndSetIfChanged(ref _Kod, value); }

        List<string> kodList = new List<string>();
        public List<string> KodList { get => kodList; set => kodList = this.RaiseAndSetIfChanged(ref kodList, value); }
        

        #endregion

        public void CreateCaptha()
        {
            ErroneousAuth++;
            Button1IsVisible = false;
            Random rnd = new Random();
            SolidColorBrush color1 = new SolidColorBrush(Color.FromRgb(
                Convert.ToByte(rnd.Next(151, 256)),
                Convert.ToByte(rnd.Next(151, 256)),
                Convert.ToByte(rnd.Next(151, 256)))
            );
            SolidColorBrush color2 = new SolidColorBrush(Color.FromRgb(
                Convert.ToByte(rnd.Next(102, 150)),
                Convert.ToByte(rnd.Next(102, 150)),
                Convert.ToByte(rnd.Next(102, 150)))
            );
            SolidColorBrush color3 = new SolidColorBrush(Color.FromRgb(
                Convert.ToByte(rnd.Next(0, 101)),
                Convert.ToByte(rnd.Next(0, 101)),
                Convert.ToByte(rnd.Next(0, 101)))
            );

            Canvas canvas = new Canvas()
            {
                Width = 400,
                Height = 300,
                Background = color3,
            };

            for (int i = 0; i < 50; i++)
            {
                Line line = new Line()
                {
                    StartPoint = new Point(rnd.Next(400), rnd.Next(300)),
                    EndPoint = new Point(rnd.Next(400), rnd.Next(300)),
                    Stroke = color2,
                    StrokeThickness = 2,
                };
                canvas.Children.Add(line);
            }

            double lastX = 10;
            double lastY = 100;

            for (int i = 0; i < 5; i++)
            {
                TextBlock number = new TextBlock()
                {
                    Text = rnd.Next(10).ToString(),
                    FontSize = rnd.Next(20, 30),
                    Foreground = color1,
                    Padding = new Avalonia.Thickness(lastX, lastY)
                };

                KodList.Add(number.Text);

                if (rnd.Next(2) == 0) number.FontStyle = FontStyle.Normal;
                else if (rnd.Next(2) == 1) number.FontStyle = FontStyle.Italic;
                else if (rnd.Next(2) == 2) number.FontWeight = FontWeight.Bold;

                lastX += number.FontSize + 10;
                lastY += rnd.Next(0, 50);

                TextBlock letter = new TextBlock()
                {
                    Text = rndLet().ToString(),
                    FontSize = rnd.Next(20, 30),
                    Foreground = color1,
                    Padding = new Avalonia.Thickness(lastX, lastY)
                };

                KodList.Add(letter.Text);

                if (rnd.Next(3) == 0) letter.FontStyle = FontStyle.Normal;
                else if (rnd.Next(3) == 1) letter.FontStyle = FontStyle.Italic;
                else if (rnd.Next(3) == 2) letter.FontWeight = FontWeight.Bold;

                lastX += number.FontSize + 10;
                lastY -= rnd.Next(0, 50);

                canvas.Children.Add(letter);
                canvas.Children.Add(number);
            }

            Border border = new Border
            {
                BorderBrush = Brushes.Black,
                BorderThickness = new Thickness(2),
                Width = 400,
                Height = 300
            };
            canvas.Children.Add(border);

            Captcha = canvas;
            TextBoxISVisible = true;
            Button2IsVisible = true;
        }
        #endregion

        #region Òàéìåð
        DispatcherTimer timer = new DispatcherTimer();

        public AuthViewModel()
        {
            timer.Interval = new TimeSpan(0, 0, 10);
            timer.Tick += new EventHandler(StopTimer);
        }

        public void StartTimer()
        {
            timer.Start();
            Kod = "";
            KodList.Clear();
            TextBoxISVisible = false;
            Button2IsVisible = false;
            Captcha.IsVisible = false;
            Login = "";
            Password = "";
            TextBoxIsEnable = false;
        }

        public void StopTimer(object sender, EventArgs e)
        {
            timer.Stop();
            TextBoxIsEnable = true;
            TextBoxISVisible = true;
            Button2IsVisible = true;
            Captcha.IsVisible = true;
            CreateCaptha();
        }
        #endregion

       
    }
}