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using System.Text.Json;
using CsvHelper;
using Enmarcha.Backend.Types.Arrivals;
using Microsoft.Extensions.Caching.Memory;
using System.Globalization;
namespace Enmarcha.Backend.Services.Processors;
public class VigoUsageProcessor : IArrivalsProcessor
{
private readonly HttpClient _httpClient;
private readonly IMemoryCache _cache;
private readonly ILogger<VigoUsageProcessor> _logger;
private readonly IHostEnvironment _environment;
private readonly FeedService _feedService;
private static readonly HashSet<string> _vigoStopsWhitelist = [];
private static bool _whitelistLoaded = false;
private static readonly object _lock = new();
public VigoUsageProcessor(
HttpClient httpClient,
IMemoryCache cache,
ILogger<VigoUsageProcessor> logger,
IHostEnvironment environment,
FeedService feedService)
{
_httpClient = httpClient;
_cache = cache;
_logger = logger;
_environment = environment;
_feedService = feedService;
LoadWhitelist();
}
private void LoadWhitelist()
{
if (_whitelistLoaded) return;
lock (_lock)
{
if (_whitelistLoaded) return;
try
{
var path = Path.Combine(_environment.ContentRootPath, "Data", "vitrasa_stops_p95.csv");
if (File.Exists(path))
{
using var reader = new StreamReader(path);
using var csv = new CsvReader(reader, CultureInfo.InvariantCulture);
csv.Read();
csv.ReadHeader();
while (csv.Read())
{
var code = csv.GetField("codigo");
if (!string.IsNullOrWhiteSpace(code))
{
_vigoStopsWhitelist.Add(code.Trim());
}
}
_logger.LogInformation("Loaded {Count} Vigo stops for usage data whitelist", _vigoStopsWhitelist.Count);
}
else
{
_logger.LogWarning("Vigo stops whitelist CSV not found at {Path}", path);
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Error loading Vigo stops whitelist");
}
finally
{
_whitelistLoaded = true;
}
}
}
public async Task ProcessAsync(ArrivalsContext context)
{
if (!context.StopId.StartsWith("vitrasa:")) return;
var normalizedCode = _feedService.NormalizeStopCode("vitrasa", context.StopCode);
if (!_vigoStopsWhitelist.Contains(normalizedCode)) return;
var cacheKey = $"vigo_usage_{normalizedCode}";
if (_cache.TryGetValue(cacheKey, out List<BusStopUsagePoint>? cachedUsage))
{
context.Usage = cachedUsage;
return;
}
try
{
using var activity = Telemetry.Source.StartActivity("FetchVigoUsage");
var url = $"https://datos.vigo.org/vci_api_app/api2.jsp?tipo=TRANSPORTE_PARADA_HORAS_USO¶da={normalizedCode}";
var response = await _httpClient.GetAsync(url);
if (response.IsSuccessStatusCode)
{
var json = await response.Content.ReadAsStringAsync();
var usage = JsonSerializer.Deserialize<List<BusStopUsagePoint>>(json);
if (usage != null)
{
_cache.Set(cacheKey, usage, TimeSpan.FromDays(7));
context.Usage = usage;
}
}
else
{
_logger.LogWarning("Failed to fetch usage data for stop {StopCode}, status: {Status}", normalizedCode, response.StatusCode);
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Error fetching usage data for Vigo stop {StopCode}", normalizedCode);
}
}
}
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