From a1d589c1a0d5a5010e5fe4e8a1ec403ffafb289f Mon Sep 17 00:00:00 2001
From: Ariel Costas Guerrero <ariel@costas.dev>
Date: Sun, 7 Dec 2025 23:33:10 +0100
Subject: Implement Renfe data source

---
 .../Services/Providers/RenfeTransitProvider.cs     | 76 ++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 src/Costasdev.Busurbano.Backend/Services/Providers/RenfeTransitProvider.cs

(limited to 'src/Costasdev.Busurbano.Backend/Services/Providers/RenfeTransitProvider.cs')

diff --git a/src/Costasdev.Busurbano.Backend/Services/Providers/RenfeTransitProvider.cs b/src/Costasdev.Busurbano.Backend/Services/Providers/RenfeTransitProvider.cs
new file mode 100644
index 0000000..55e880f
--- /dev/null
+++ b/src/Costasdev.Busurbano.Backend/Services/Providers/RenfeTransitProvider.cs
@@ -0,0 +1,76 @@
+using Costasdev.Busurbano.Backend.Configuration;
+using Costasdev.Busurbano.Backend.Extensions;
+using Costasdev.Busurbano.Backend.Types;
+using Microsoft.Extensions.Options;
+using SysFile = System.IO.File;
+
+namespace Costasdev.Busurbano.Backend.Services.Providers;
+
+public class RenfeTransitProvider : ITransitProvider
+{
+    private readonly AppConfiguration _configuration;
+    private readonly ILogger<RenfeTransitProvider> _logger;
+
+    public RenfeTransitProvider(IOptions<AppConfiguration> options, ILogger<RenfeTransitProvider> logger)
+    {
+        _configuration = options.Value;
+        _logger = logger;
+    }
+
+    public async Task<List<ConsolidatedCirculation>> GetCirculationsAsync(string stopId, DateTime nowLocal)
+    {
+        var todayDate = nowLocal.Date.ToString("yyyy-MM-dd");
+        var stopArrivals = await LoadStopArrivalsProto(stopId, todayDate);
+
+        if (stopArrivals == null)
+        {
+            return [];
+        }
+
+        var now = nowLocal.AddSeconds(60 - nowLocal.Second);
+        var scopeEnd = now.AddMinutes(300);
+
+        var scheduledWindow = stopArrivals.Arrivals
+            .Where(c => c.CallingDateTime(nowLocal.Date) != null)
+            .Where(c => c.CallingDateTime(nowLocal.Date)!.Value >= now && c.CallingDateTime(nowLocal.Date)!.Value <= scopeEnd)
+            .OrderBy(c => c.CallingDateTime(nowLocal.Date)!.Value);
+
+        var consolidatedCirculations = new List<ConsolidatedCirculation>();
+
+        foreach (var sched in scheduledWindow)
+        {
+            var minutes = (int)(sched.CallingDateTime(nowLocal.Date)!.Value - now).TotalMinutes;
+
+            consolidatedCirculations.Add(new ConsolidatedCirculation
+            {
+                Line = sched.Line,
+                Route = sched.Route,
+                Schedule = new ScheduleData
+                {
+                    Running = sched.StartingDateTime(nowLocal.Date)!.Value <= now,
+                    Minutes = minutes,
+                    TripId = sched.TripId,
+                    ServiceId = sched.ServiceId,
+                    ShapeId = sched.ShapeId,
+                },
+                RealTime = null
+            });
+        }
+
+        return consolidatedCirculations;
+    }
+
+    private async Task<StopArrivals?> LoadStopArrivalsProto(string stopId, string dateString)
+    {
+        var file = Path.Combine(_configuration.RenfeScheduleBasePath, dateString, stopId + ".pb");
+        if (!SysFile.Exists(file))
+        {
+            _logger.LogWarning("Stop arrivals proto file not found: {File}", file);
+            return null;
+        }
+
+        var contents = await SysFile.ReadAllBytesAsync(file);
+        var stopArrivals = StopArrivals.Parser.ParseFrom(contents);
+        return stopArrivals;
+    }
+}
-- 
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