using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace TabletTester2025.Views
{
    public partial class NumericKeypadWindow : Window
    {
        private readonly bool _allowDecimal;
        private readonly bool _allowNegative;

        public NumericKeypadWindow(string initialValue, bool allowDecimal, bool allowNegative)
        {
            InitializeComponent();
            _allowDecimal = allowDecimal;
            _allowNegative = allowNegative;
            DisplayBox.Text = initialValue?.Trim() ?? "";
            DecimalButton.IsEnabled = allowDecimal;
            SignButton.IsEnabled = allowNegative;
        }

        public string ResultText => DisplayBox.Text;

        private void DigitButton_Click(object sender, RoutedEventArgs e)
        {
            if (sender is Button button && button.Content is string value)
                DisplayBox.Text += value;
        }

        private void DecimalButton_Click(object sender, RoutedEventArgs e)
        {
            if (!_allowDecimal || DisplayBox.Text.Contains('.'))
                return;

            DisplayBox.Text = string.IsNullOrWhiteSpace(DisplayBox.Text)
                ? "0."
                : DisplayBox.Text + ".";
        }

        private void SignButton_Click(object sender, RoutedEventArgs e)
        {
            if (!_allowNegative)
                return;

            DisplayBox.Text = DisplayBox.Text.StartsWith("-")
                ? DisplayBox.Text[1..]
                : "-" + DisplayBox.Text;
        }

        private void BackspaceButton_Click(object sender, RoutedEventArgs e)
        {
            if (DisplayBox.Text.Length > 0)
                DisplayBox.Text = DisplayBox.Text[..^1];
        }

        private void ClearButton_Click(object sender, RoutedEventArgs e)
        {
            DisplayBox.Clear();
        }

        private void OkButton_Click(object sender, RoutedEventArgs e)
        {
            DialogResult = true;
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            DialogResult = false;
        }

        private void Window_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key >= Key.D0 && e.Key <= Key.D9)
            {
                DisplayBox.Text += (e.Key - Key.D0).ToString();
                e.Handled = true;
                return;
            }

            if (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)
            {
                DisplayBox.Text += (e.Key - Key.NumPad0).ToString();
                e.Handled = true;
                return;
            }

            if (e.Key == Key.Back)
            {
                BackspaceButton_Click(sender, e);
                e.Handled = true;
            }
            else if (e.Key == Key.Enter)
            {
                OkButton_Click(sender, e);
                e.Handled = true;
            }
            else if (e.Key == Key.Escape)
            {
                CancelButton_Click(sender, e);
                e.Handled = true;
            }
            else if (_allowDecimal && (e.Key == Key.Decimal || e.Key == Key.OemPeriod))
            {
                DecimalButton_Click(sender, e);
                e.Handled = true;
            }
        }
    }
}