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using Enmarcha.Backend.Types;
using static Enmarcha.Backend.Types.StopArrivals.Types;
namespace Enmarcha.Backend.Extensions;
public static class StopScheduleExtensions
{
public static DateTime? StartingDateTime(this StopArrivals.Types.ScheduledArrival stop, DateTime baseDate)
{
return ParseGtfsTime(stop.StartingTime, baseDate);
}
public static DateTime? CallingDateTime(this StopArrivals.Types.ScheduledArrival stop, DateTime baseDate)
{
return ParseGtfsTime(stop.CallingTime, baseDate);
}
/// <summary>
/// Parse GTFS time format (HH:MM:SS) which can have hours >= 24 for services past midnight
/// </summary>
private static DateTime? ParseGtfsTime(string timeStr, DateTime baseDate)
{
if (string.IsNullOrWhiteSpace(timeStr))
{
return null;
}
var parts = timeStr.Split(':');
if (parts.Length != 3)
{
return null;
}
if (!int.TryParse(parts[0], out var hours) ||
!int.TryParse(parts[1], out var minutes) ||
!int.TryParse(parts[2], out var seconds))
{
return null;
}
// Handle GTFS times that exceed 24 hours (e.g., 25:30:00 for 1:30 AM next day)
var days = hours / 24;
var normalizedHours = hours % 24;
try
{
var dt = baseDate
.AddDays(days)
.AddHours(normalizedHours)
.AddMinutes(minutes)
.AddSeconds(seconds);
return dt.AddSeconds(60 - dt.Second);
}
catch
{
return null;
}
}
}
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