using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
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 District_3_App.ExtraInfo;
using District_3_App.ProfileSocialNetworkInfoStuff.Entities;
using District_3_App.ProfileSocialNetworkInfoStuff.ProfileNetworkInfo_Repository;
using Log_In;

namespace District_3_App.LogIn
{
    public partial class SignUp : UserControl
    {
        public User User { get; set; }
        private string currentUsername;

        private UsersRepository usersRepository;
        private UserManager userManager;
        public SignUp()
        {
            InitializeComponent();
            string filePath = "./Users.xml";
            usersRepository = new UsersRepository(filePath);
            userManager = new UserManager(filePath);
        }

        private Guid GenerateRandomUserId()
        {
            return Guid.NewGuid();
        }

        private void SignInLink_Click(object sender, RoutedEventArgs e)
        {
            var newContent = new SignInPage();
            Grid.SetColumn(newContent, 2);
            Grid.SetRow(newContent, 0);
            Grid.SetRowSpan(newContent, 6);
            SignUpGrid.Children.Clear();
            SignUpGrid.Children.Add(newContent);
        }

        private void TogglePasswordVisibility_Click(object sender, RoutedEventArgs e)
        {
            if (PasswordVisibilityIcon.Source.ToString().Contains("hidePasswordIcon") && txtVisiblePassword.Visibility == Visibility.Collapsed)
            {
                txtPassword.Visibility = Visibility.Collapsed;
                txtVisiblePassword.Visibility = Visibility.Visible;
                PasswordVisibilityIcon.Source = new BitmapImage(new Uri("pack://application:,,,/images/showPasswordIcon.png"));
                txtVisiblePassword.Text = txtPassword.Password;
            }
            else
            {
                txtPassword.Visibility = Visibility.Visible;
                txtVisiblePassword.Visibility = Visibility.Collapsed;
                PasswordVisibilityIcon.Source = new BitmapImage(new Uri("pack://application:,,,/images/hidePasswordIcon.png"));
                txtPassword.Password = txtVisiblePassword.Text;
            }
        }

        private void ToggleConfirmPasswordVisibility_Click(object sender, RoutedEventArgs e)
        {
            if (ConfirmPasswordVisibilityIcon.Source.ToString().Contains("hidePasswordIcon") && txtVisibleConfirmPassword.Visibility == Visibility.Collapsed)
            {
                txtConfirmPassword.Visibility = Visibility.Collapsed;
                txtVisibleConfirmPassword.Visibility = Visibility.Visible;
                ConfirmPasswordVisibilityIcon.Source = new BitmapImage(new Uri("pack://application:,,,/images/showPasswordIcon.png"));
                txtVisibleConfirmPassword.Text = txtConfirmPassword.Password;
            }
            else
            {
                txtConfirmPassword.Visibility = Visibility.Visible;
                txtVisibleConfirmPassword.Visibility = Visibility.Collapsed;
                ConfirmPasswordVisibilityIcon.Source = new BitmapImage(new Uri("pack://application:,,,/images/hidePasswordIcon.png"));
                txtConfirmPassword.Password = txtVisibleConfirmPassword.Text;
            }
        }

        private void SignUpButton_Click(object sender, RoutedEventArgs e)
        {
            bool isValid = true;
            bool userDoesntExist = true;

            if (!ValidateUsername(txtUsername.Text))
            {
                isValid = false;
            }

            if (!ValidateEmail(txtEmail.Text))
            {
                MessageBox.Show("Invalid email.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                isValid = false;
            }

            // if (ValidatePassword(txtPassword.Password) == false)
            // {
            //    MessageBox.Show("Invalid password. The password's length must be between 5 and 10 characters and must contain at least one uppercase letter, one lowercase letter, one number, and one special character(/_-.)", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            //    isValid = false;
            // }

            // if (ValidateConfirmPassword(txtConfirmPassword.Password) == false)
            // {
            //    MessageBox.Show("Invalid confirmation password. The password's length must be between 5 and 10 characters and must contain at least one uppercase letter, one lowercase letter, one number, and one special character(/_-.)", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            //    isValid = false;
            // }
            if (txtPassword.Password.Equals(txtConfirmPassword.Password) == false)
            {
                MessageBox.Show("Please choose the same password!.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                isValid = false;
            }

            if (isValid)
            {
                if (usersRepository.UsernameExists(txtUsername.Text) || usersRepository.EmailExists(txtEmail.Text) || (usersRepository.UsernameExists(txtUsername.Text) && usersRepository.EmailExists(txtEmail.Text)))
                {
                    MessageBox.Show("Account already exists.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                    userDoesntExist = false;
                }
                if (userDoesntExist)
                {
                    User newUser = new User
                    {
                        Id = GenerateRandomUserId(),
                        Username = txtUsername.Text,
                        Email = txtEmail.Text,
                        Password = txtPassword.Password,
                        ConfirmationPassword = txtConfirmPassword.Password
                    };
                    try
                    {
                        usersRepository.AddUser(newUser);
                        userManager.StartOrRenewSession(newUser);
                        // UserManager.currentUsername = newUser.username;
                        ClearSignUpForm();
                        var newContent = new MainWindow();
                        newContent.Show();
                        Window.GetWindow(this).Close();
                    }
                    catch (ArgumentException ex)
                    {
                        // Handle the case where the username already exists
                        MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                    }
                }
            }
        }

        private void ClearSignUpForm()
        {
            txtUsername.Clear();
            txtEmail.Clear();
            txtPassword.Clear();
            txtConfirmPassword.Clear();
        }

        private bool ValidateUsername(string username)
        {
            var hasMiniMaxChars = new Regex(@".{5,11}");
            var hasNumericChar = new Regex(@"[0-9]+");
            var hasAlphabeticChar = new Regex(@"[A-Za-z]");
            var hasSpecialChar = new Regex(@"[_.-]");

            if (hasMiniMaxChars.IsMatch(username) && hasNumericChar.IsMatch(username) && hasAlphabeticChar.IsMatch(username) && hasSpecialChar.IsMatch(username))
            {
                return true;
            }
            else if (!hasMiniMaxChars.IsMatch(username))
            {
                MessageBox.Show("Invalid username. The username's length must be between 5 and 11 characters.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                return false;
            }
            else if (!hasNumericChar.IsMatch(username))
            {
                MessageBox.Show("Invalid username. The username must contain at least one number.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                return false;
            }
            else if (!hasAlphabeticChar.IsMatch(username))
            {
                MessageBox.Show("Invalid username. The username must contain at least one alphabetic character..", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                return false;
            }
            else if (!hasSpecialChar.IsMatch(username))
            {
                MessageBox.Show("Invalid username. The username must contain at least one special character(_ . -).", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                return false;
            }
            else
            {
                return false;
            }
        }

        private bool ValidateEmail(string email)
        {
            if (Regex.IsMatch(email, @"^[^@\s]+@[^@\s]+\.[^@\s]+$", RegexOptions.IgnoreCase))
            {
                return true;
            }
            return false;
        }

        private bool ValidatePassword(string password)
        {
            var hasNumericChar = new Regex(@"[0-9]+");
            var hasUpperChar = new Regex(@"[A-Z]+");
            var hasLowerChar = new Regex(@"[a-z]+");
            var hasSpecialChar = new Regex(@"[/-_.]+");
            var hasMiniMaxChars = new Regex(@".{5,10}");

            bool isPasswordValid = hasNumericChar.IsMatch(password) && hasUpperChar.IsMatch(password) && hasLowerChar.IsMatch(password) && hasSpecialChar.IsMatch(password) && hasMiniMaxChars.IsMatch(password);
            return isPasswordValid;
        }

        private bool ValidateConfirmPassword(string confirmPassword)
        {
            var hasNumericChar = new Regex(@"[0-9]+");
            var hasUpperChar = new Regex(@"[A-Z]+");
            var hasLowerChar = new Regex(@"[a-z]+");
            var hasSpecialChar = new Regex(@"[/\-_.]+");
            var hasMiniMaxChars = new Regex(@".{5,10}");

            bool isConfirmationPasswordValid = hasNumericChar.IsMatch(confirmPassword) && hasUpperChar.IsMatch(confirmPassword) && hasLowerChar.IsMatch(confirmPassword) && hasSpecialChar.IsMatch(confirmPassword) && hasMiniMaxChars.IsMatch(confirmPassword);
            return isConfirmationPasswordValid;
        }
    }
}