using System.Windows;
using System.Windows.Media;

namespace CheckersSpielBot
{
    public partial class LoginWindow : Window
    {
        private readonly DatabaseService _db = new();
        private bool _isLoginMode = true;

        public LoginWindow()
        {
            InitializeComponent();
            ApplyTabStyle();
        }

        #region Tab switching
        private void SwitchToLogin(object sender, RoutedEventArgs e)
        {
            _isLoginMode = true;
            ActionBtn.Content = "Login";
            ErrorText.Text = string.Empty;
            PwdBox.Clear();
            ApplyTabStyle();
        }

        private void SwitchToRegister(object sender, RoutedEventArgs e)
        {
            _isLoginMode = false;
            ActionBtn.Content = "Register";
            ErrorText.Text = string.Empty;
            PwdBox.Clear();
            ApplyTabStyle();
        }

        private void ApplyTabStyle()
        {
            // Active tab — white text, red underline
            // Inactive tab — grey text, grey underline
            if (_isLoginMode)
            {
                TabLoginBtn.Foreground = Brushes.White;
                TabRegisterBtn.Foreground = new SolidColorBrush(Color.FromRgb(0x88, 0x88, 0x88));
            }
            else
            {
                TabLoginBtn.Foreground = new SolidColorBrush(Color.FromRgb(0x88, 0x88, 0x88));
                TabRegisterBtn.Foreground = Brushes.White;
            }
        }
        #endregion

        #region Actions
        private void ActionBtn_Click(object sender, RoutedEventArgs e)
        {
            if (_isLoginMode) HandleLogin();
            else HandleRegister();
        }

        private void HandleLogin()
        {
            string username = UsernameBox.Text.Trim();
            string password = PwdBox.Password;

            if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password))
            {
                ShowError("Please enter username and password.");
                return;
            }

            if (!_db.LoginPlayer(username, password, out int playerId, out string error))
            {
                ShowError(error);
                return;
            }

            PlayerSession.PlayerId = playerId;
            PlayerSession.Username = username;

            var mainWindow = new MainWindow();
            mainWindow.Show();
            Close();
        }

        private void HandleRegister()
        {
            string username = UsernameBox.Text.Trim();
            string password = PwdBox.Password;

            if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password))
            {
                ShowError("Please enter username and password.");
                return;
            }

            if (username.Length < 3)
            {
                ShowError("Username must be at least 3 characters.");
                return;
            }

            if (password.Length < 6)
            {
                ShowError("Password must be at least 6 characters.");
                return;
            }

            if (!_db.RegisterPlayer(username, password, out string error))
            {
                ShowError(error);
                return;
            }

            ErrorText.Foreground = Brushes.LightGreen;
            ErrorText.Text = "Registered! You can now login.";
            SwitchToLogin(null!, null!);
        }
        #endregion

        #region Helpers
        private void ShowError(string message)
        {
            ErrorText.Foreground = Brushes.OrangeRed;
            ErrorText.Text = message;
        }
        #endregion
    }
}