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using System.Globalization;
using System.Net.Http.Json;
using System.Text.RegularExpressions;
using Microsoft.Extensions.Logging;
using NodaTime;
using TransitRealtime;
namespace Enmarcha.Sources.GtfsRealtime;
public partial class GtfsRealtimeEstimatesProvider
{
private HttpClient _http;
private ILogger<GtfsRealtimeEstimatesProvider> _logger;
[GeneratedRegex("^(?<tripId>[0-9]{5})[0-9](?<date>[0-9]{4}-[0-9]{2}-[0-9]{2})$")]
private static partial Regex TripInformationExpression { get; }
public GtfsRealtimeEstimatesProvider(HttpClient http, ILogger<GtfsRealtimeEstimatesProvider> logger)
{
_http = http;
_logger = logger;
}
public async Task<FeedMessage> DownloadFeed(string url)
{
var response = await _http.GetAsync(url);
var body = await response.Content.ReadAsByteArrayAsync();
return FeedMessage.Parser.ParseFrom(body);
}
public async Task<Dictionary<string, int?>> GetRenfeDelays()
{
const string url = "https://gtfsrt.renfe.com/trip_updates_LD.pb";
var feed = await DownloadFeed(url);
var offsetInMadrid = DateTimeZoneProviders.Tzdb["Europe/Madrid"];
var expectedDate = SystemClock.Instance
.GetCurrentInstant()
.InZone(offsetInMadrid).Date
.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
Dictionary<string, int?> delays = new();
foreach (var entity in feed.Entity)
{
if (entity.TripUpdate is null)
{
_logger.LogWarning("Entity {entityId} entity.Id has no trip updates", entity.Id);
continue;
}
if (!entity.TripUpdate.Trip.HasTripId)
{
continue;
}
var tripId = entity.TripUpdate.Trip.TripId!;
var idMatch = TripInformationExpression.Match(tripId);
var trainNumber = idMatch.Groups["tripId"].Value;
if (!idMatch.Success)
{
_logger.LogWarning("Unable to match {tripId} ({entityId}) into trip ID and date",
tripId, entity.Id);
continue;
}
// TODO: Revise this, since apparently some trips appear with the previous day
// if (expectedDate != idMatch.Groups["date"].Value)
// {
// _logger.LogDebug("Entity {entityId} has trip ID {tripId} which is not for today",
// entity.Id, tripId);
// continue;
// }
if (entity.TripUpdate.Trip.HasScheduleRelationship &&
entity.TripUpdate.Trip.ScheduleRelationship == TripDescriptor.Types.ScheduleRelationship.Canceled
)
{
delays.TryAdd(trainNumber, null);
continue;
}
if (!entity.TripUpdate.HasDelay)
{
_logger.LogDebug("Trip {tripId} ({entityId}) has no delay information, and is not cancelled", tripId,
entity.Id);
continue;
}
delays.TryAdd(trainNumber, entity.TripUpdate.Delay);
}
return delays;
}
public async Task<Dictionary<string, Coordinates>> GetRenfePositions()
{
const string url = "https://gtfsrt.renfe.com/vehicle_positions_LD.pb";
var feed = await DownloadFeed(url);
var offsetInMadrid = DateTimeZoneProviders.Tzdb["Europe/Madrid"];
var expectedDate = SystemClock.Instance
.GetCurrentInstant()
.InZone(offsetInMadrid).Date
.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
Dictionary<string, Coordinates> positions = new();
foreach (var entity in feed.Entity)
{
if (entity.Vehicle?.Position is null)
{
_logger.LogWarning("Entity {entityId} entity.Id has no vehicle information", entity.Id);
continue;
}
if (!entity.Vehicle.Trip.HasTripId)
{
continue;
}
var tripId = entity.Vehicle.Trip.TripId!;
var idMatch = TripInformationExpression.Match(tripId);
var trainNumber = idMatch.Groups["tripId"].Value;
if (!idMatch.Success)
{
_logger.LogWarning("Unable to match {tripId} ({entityId}) into trip ID and date",
tripId, entity.Id);
continue;
}
// TODO: Revise this, since apparently some trips appear with the previous day
// if (expectedDate != idMatch.Groups["date"].Value)
// {
// _logger.LogDebug("Entity {entityId} has trip ID {tripId} which is not for today",
// entity.Id, tripId);
// continue;
// }
positions.TryAdd(trainNumber, new Coordinates
{
Latitude = entity.Vehicle.Position.Latitude,
Longitude = entity.Vehicle.Position.Longitude
});
}
return positions;
}
}
public class Coordinates
{
public double Latitude { get; set; }
public double Longitude { get; set; }
}
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