using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;

namespace UIShare.Converters
{
    public class BooleanToVisibilityConverter : IValueConverter
    {
        // 同时接受 "invert" / "inverse" / "inverted" / "reverse"（大小写不敏感）作为反转参数，
        // 避免因 XAML 处用了 ConverterParameter=Inverse 而静默失效。
        private static bool IsInvert(object parameter)
        {
            var s = parameter?.ToString()?.ToLowerInvariant();
            return s == "invert" || s == "inverse" || s == "inverted" || s == "reverse";
        }

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            bool input = value is bool b && b;
            if (IsInvert(parameter))
                input = !input;

            return input ? Visibility.Visible : Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            bool output = value is Visibility v && v == Visibility.Visible;
            if (IsInvert(parameter))
                output = !output;

            return output;
        }
    }
}
