using System.Globalization;
using System.Windows.Data;

namespace SharepointToolbox.Views.Converters;

/// <summary>
/// Converts a long byte value to a human-readable label for chart axes and tooltips.
/// Similar to BytesConverter but implements IValueConverter for XAML binding.
/// </summary>
public class BytesLabelConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value is not long bytes) return value?.ToString() ?? "";
        if (bytes < 1024) return $"{bytes} B";
        if (bytes < 1024 * 1024) return $"{bytes / 1024.0:F1} KB";
        if (bytes < 1024 * 1024 * 1024) return $"{bytes / (1024.0 * 1024):F1} MB";
        return $"{bytes / (1024.0 * 1024 * 1024):F2} GB";
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        => throw new NotSupportedException();
}