using System;
using System.Globalization;
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Interactivity;
using MathInterpreter.Core;
using MsBox.Avalonia;
using MsBox.Avalonia.Base;
using MsBox.Avalonia.Enums;

namespace MathInterpreter;

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;
    }
    

    private async void Calculate(object sender, RoutedEventArgs e)
    {
        try
        {
            string input = ExpressionInput.Text ?? throw new InvalidOperationException("Input must not be empty");
            var expression = new MathExpression(input);
            Result.Text = expression.Result.ToString(CultureInfo.InvariantCulture);
        }
        catch (Exception ex)
        {
            string exStr = UnwrapException(ex);
            await ShowError(exStr);
        }
    }

    private static string UnwrapException(Exception exception)
    {
        string message = exception.Message;

        if (exception.InnerException != null)
        {
            message += $"{Environment.NewLine}Inner exception: {UnwrapException(exception.InnerException)}";
        }

        return message;
    }

    private static async ValueTask ShowError(string message)
    {
        IMsBox<ButtonResult> box = MessageBoxManager.GetMessageBoxStandard("Error", message);
        await box.ShowAsync();
    }
}