using System.Data;
using System.Text;
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 MahApps.Metro.Controls;
using Npgsql;
using Npgsql.Replication;

namespace PrototypWPFHAG;

/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : MetroWindow
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        UsernameTextBox.Focus(); // Focus first TextBox on start
    }

    private static NpgsqlConnection GetConnection()
    {
        return new NpgsqlConnection("Server=localhost;Port=5432;User Id=postgres;Password=postgres;Database=postgres;");
    }

    private string ValidateUser(string username, string password)
    {
        using (NpgsqlConnection con = GetConnection())
        {
            con.Open();

            // Check for correct UserName
            string userQuery = "SELECT COUNT(*) FROM \"User\" WHERE \"UserName\" = @username";
            using (NpgsqlCommand userCmd = new NpgsqlCommand(userQuery, con))
            {
                userCmd.Parameters.AddWithValue("@username", username);
                int userExists = Convert.ToInt32(userCmd.ExecuteScalar());

                if (userExists == 0)
                {
                    return "Dieser Benutzername existiert nicht";
                }
            }
            
            // Check for correct Password
            string pwQuery = "SELECT COUNT(*) FROM \"User\" WHERE \"UserName\" = @username AND \"Password\" = @password";
            using (NpgsqlCommand pwCmd = new NpgsqlCommand(pwQuery, con))
            {
                pwCmd.Parameters.AddWithValue("@username", username);
                pwCmd.Parameters.AddWithValue("@password", password);
                int correctPassword = Convert.ToInt32(pwCmd.ExecuteScalar());

                if (correctPassword == 0)
                {
                    return "Falsches Password!";
                }
            }
        }

        return "Erfolgreich";
    }

    private void ShowPasswordButton_PreviewMouseDown(object sender, RoutedEventArgs e)
    {
        PasswordVisibleTextBox.Text = PasswordTextBox.Password; // Write password in the visible box
        PasswordVisibleTextBox.Visibility = Visibility.Visible;
        PasswordTextBox.Visibility = Visibility.Collapsed;
    }

    private void ShowPasswordButton_Click(object sender, RoutedEventArgs e)
    {
        if (PasswordTextBox.Visibility == Visibility.Visible)
        {
            // Show password
            PasswordVisibleTextBox.Text = PasswordTextBox.Password;
            PasswordVisibleTextBox.Visibility = Visibility.Visible;
            PasswordTextBox.Visibility = Visibility.Collapsed;
        }
        else
        {
            // Hide password
            PasswordTextBox.Visibility = Visibility.Visible;
            PasswordVisibleTextBox.Visibility = Visibility.Collapsed;
        }
    }

    // Syncs password with visible TextBox
    private void PasswordTextBox_PasswordChanged(object sender, RoutedEventArgs e)
    {
        PasswordVisibleTextBox.Text = PasswordTextBox.Password;
    }

    private void loginButton_Click(object sender, RoutedEventArgs e)
    {
        string username = UsernameTextBox.Text;
        string password = PasswordTextBox.Password;
        string result = ValidateUser(username, password);

        if (result == "Erfolgreich")
        {
            SearchWindow searchWindow = new();
            searchWindow.Show(); // Open new window
            this.Close(); // Close this window
        }
        else
        {
            MessageBox.Show(result, "Fehler", MessageBoxButton.OK, MessageBoxImage.Error);
        }
    }
}