using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Controls;
using InstaSoftOfficeTool.Models;

namespace InstaSoftOfficeTool.Pages
{
    public partial class ProductKeyPage : Page, IWizardPage
    {
        private readonly MainWindow _main;
        private readonly InstallConfig _config;
        private readonly TextBox[] _keyBoxes;
        private bool _suppressAutoTab;

        public ProductKeyPage(MainWindow main, InstallConfig config)
        {
            InitializeComponent();
            _main = main;
            _config = config;
            _keyBoxes = new[] { Key1, Key2, Key3, Key4, Key5 };

            if (!string.IsNullOrEmpty(_config.ProductKey))
            {
                var parts = _config.ProductKey.Split('-');
                for (int i = 0; i < parts.Length && i < 5; i++)
                {
                    _keyBoxes[i].Text = parts[i];
                }
            }
        }

        private void KeyBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (_suppressAutoTab) return;

            var tb = (TextBox)sender;

            var cleaned = Regex.Replace(tb.Text, "[^A-Za-z0-9]", "");
            if (cleaned != tb.Text)
            {
                _suppressAutoTab = true;
                tb.Text = cleaned;
                tb.CaretIndex = cleaned.Length;
                _suppressAutoTab = false;
            }

            if (tb.Text.Length == 5)
            {
                for (int i = 0; i < _keyBoxes.Length - 1; i++)
                {
                    if (_keyBoxes[i] == tb)
                    {
                        _keyBoxes[i + 1].Focus();
                        break;
                    }
                }
            }

            ValidationMessage.Visibility = Visibility.Collapsed;
        }

        private void CbSkipKey_Changed(object sender, RoutedEventArgs e)
        {
            bool skip = CbSkipKey.IsChecked == true;
            foreach (var box in _keyBoxes)
            {
                box.IsEnabled = !skip;
                if (skip) box.Text = "";
            }
            ValidationMessage.Visibility = Visibility.Collapsed;
        }

        public bool Validate()
        {
            if (CbSkipKey.IsChecked == true)
            {
                _config.ProductKey = null;
                return true;
            }

            bool allEmpty = true;
            foreach (var box in _keyBoxes)
            {
                if (!string.IsNullOrEmpty(box.Text))
                {
                    allEmpty = false;
                    break;
                }
            }

            if (allEmpty)
            {
                _config.ProductKey = null;
                return true;
            }

            foreach (var box in _keyBoxes)
            {
                if (box.Text.Length != 5 || !Regex.IsMatch(box.Text, "^[A-Za-z0-9]{5}$"))
                {
                    ValidationMessage.Text = "A term\u00e9kkulcsnak 5 x 5 alfanumerikus karakterb\u0151l kell \u00e1llnia.";
                    ValidationMessage.Visibility = Visibility.Visible;
                    return false;
                }
            }

            _config.ProductKey = string.Join("-",
                Key1.Text, Key2.Text, Key3.Text, Key4.Text, Key5.Text).ToUpper();
            return true;
        }
    }
}