namespace Dashboard
{
    public static class MeasurementExtensions
    {
        public static bool IsRelative(this LayoutUnit unit) => unit switch {
            LayoutUnit.Star or LayoutUnit.Percent => true,
            _ => false,
        };
        public static bool IsAbsolute(this LayoutUnit unit) => !IsRelative(unit);

        public static string ToShortString(this LayoutUnit unit) => unit switch {
            LayoutUnit.Pixel => "px",
            LayoutUnit.Point => "pt",
            LayoutUnit.Millimeter => "mm",
            LayoutUnit.Star => "*",
            LayoutUnit.Percent => "%",
            _ => throw new Exception("Unknown unit."),
        };

        public static bool WithinTolerance(this float value, float reference, float absTol, float relTol)
            => value.CompareTolerance(reference, absTol, relTol) == 0;

        public static int CompareTolerance(this float value, float reference, float absTol, float relTol)
        {
            float tolerance = Math.Max(absTol, Math.Abs(reference) * relTol);
            float difference = value - reference;
            return difference < -tolerance ? -1 : difference > tolerance ? 1 : 0;
        }
    }
}