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

---
 .../Extensions/StopScheduleExtensions.cs           | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/Costasdev.Busurbano.Backend/Extensions/StopScheduleExtensions.cs

(limited to 'src/Costasdev.Busurbano.Backend/Extensions')

diff --git a/src/Costasdev.Busurbano.Backend/Extensions/StopScheduleExtensions.cs b/src/Costasdev.Busurbano.Backend/Extensions/StopScheduleExtensions.cs
new file mode 100644
index 0000000..b435158
--- /dev/null
+++ b/src/Costasdev.Busurbano.Backend/Extensions/StopScheduleExtensions.cs
@@ -0,0 +1,58 @@
+using static Costasdev.Busurbano.Backend.Types.StopArrivals.Types;
+
+namespace Costasdev.Busurbano.Backend.Extensions;
+
+public static class StopScheduleExtensions
+{
+    public static DateTime? StartingDateTime(this ScheduledArrival stop, DateTime baseDate)
+    {
+        return ParseGtfsTime(stop.StartingTime, baseDate);
+    }
+
+    public static DateTime? CallingDateTime(this 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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