WorkTracker/Formatting/DurationFormatter.cs

namespace WorkTracker.Formatting;

public static class DurationFormatter
{
    public static string FormatHours(decimal value, bool blankWhenZero = false)
    {
        var totalMinutes = (int)Math.Round(value * 60m, MidpointRounding.AwayFromZero);
        if (totalMinutes == 0)
        {
            return blankWhenZero ? string.Empty : "0";
        }

        var sign = totalMinutes < 0 ? "-" : string.Empty;
        totalMinutes = Math.Abs(totalMinutes);

        var hours = totalMinutes / 60;
        var minutes = totalMinutes % 60;
        return minutes == 0
            ? $"{sign}{hours}"
            : $"{sign}{hours}:{minutes:00}";
    }

    public static string FormatSignedHours(decimal value)
    {
        if (value > 0m)
        {
            return $"+{FormatHours(value)}";
        }

        if (value < 0m)
        {
            return $"-{FormatHours(Math.Abs(value))}";
        }

        return "0";
    }
}