using System;

namespace Questionable.Controller.Utils;

internal static class ExpiryUtils
{
	private static readonly TimeOnly ResetTime = new TimeOnly(14, 59, 59);

	private static readonly TimeSpan EndOfDaySentinel = new TimeSpan(23, 59, 59);

	public static DateTime AtDailyReset(DateOnly date)
	{
		return new DateTime(date, ResetTime, DateTimeKind.Utc);
	}

	public static DateTime NormalizeExpiry(DateTime expiry)
	{
		TimeSpan timeOfDay = expiry.TimeOfDay;
		if (timeOfDay == TimeSpan.Zero || timeOfDay == EndOfDaySentinel)
		{
			return AtDailyReset(DateOnly.FromDateTime(expiry));
		}
		if (expiry.Kind != DateTimeKind.Utc)
		{
			return expiry.ToUniversalTime();
		}
		return expiry;
	}

	public static string FormatTimeSpan(TimeSpan timeSpan)
	{
		if (timeSpan.TotalMinutes < 1.0)
		{
			return "< 1m";
		}
		if (!(timeSpan.TotalHours < 1.0))
		{
			if (!(timeSpan.TotalDays < 1.0))
			{
				return $"{(int)timeSpan.TotalDays}d {timeSpan.Hours}h";
			}
			return $"{timeSpan.Hours}h {timeSpan.Minutes}m";
		}
		return $"{timeSpan.Minutes}m";
	}
}