using System;

using TimeSpanParserUtil;

namespace MfGames.Nitride.Temporal.Schedules;

public static class TimeSpanHelper
{
    public static TimeSpan? Parse(string? input)
    {
        if (string.IsNullOrWhiteSpace(input))
        {
            return null;
        }

        if (input.Equals(
                "immediate",
                StringComparison.InvariantCultureIgnoreCase)
            || input.Equals(
                "instant",
                StringComparison.InvariantCultureIgnoreCase))
        {
            return TimeSpan.Zero;
        }

        if (input.Equals(
                "never",
                StringComparison.InvariantCultureIgnoreCase))
        {
            return null;
        }

        return TimeSpanParser.Parse(input);
    }
}