1 files changed, 49 insertions, 0 deletions
diff --git a/src/Costasdev.Busurbano.Backend/Services/FareService.cs b/src/Costasdev.Busurbano.Backend/Services/FareService.cs
new file mode 100644
index 0000000..0e4fefc
--- /dev/null
+++ b/src/Costasdev.Busurbano.Backend/Services/FareService.cs
@@ -0,0 +1,49 @@
+using Costasdev.Busurbano.Backend.Configuration;
+using Costasdev.Busurbano.Backend.Types.Planner;
+using Microsoft.Extensions.Options;
+
+namespace Costasdev.Busurbano.Backend.Services;
+
+public record FareResult(double CashFareEuro, double CardFareEuro);
+
+public class FareService
+{
+    private readonly AppConfiguration _config;
+
+    public FareService(IOptions<AppConfiguration> config)
+    {
+        _config = config.Value;
+    }
+
+    public FareResult CalculateFare(IEnumerable<Leg> legs)
+    {
+        var busLegs = legs.Where(l => l.Mode != null && l.Mode.ToUpper() != "WALK").ToList();
+
+        // Cash fare logic
+        // TODO: In the future, this should depend on the operator/feed
+        var cashFare = busLegs.Count * 1.63; // Defaulting to Vitrasa for now
+
+        // Card fare logic (45-min transfer window)
+        int cardTicketsRequired = 0;
+        DateTime? lastTicketPurchased = null;
+        int tripsPaidWithTicket = 0;
+
+        foreach (var leg in busLegs)
+        {
+            if (lastTicketPurchased == null ||
+                (leg.StartTime - lastTicketPurchased.Value).TotalMinutes > 45 ||
+                tripsPaidWithTicket >= 3)
+            {
+                cardTicketsRequired++;
+                lastTicketPurchased = leg.StartTime;
+                tripsPaidWithTicket = 1;
+            }
+            else
+            {
+                tripsPaidWithTicket++;
+            }
+        }
+
+        return new FareResult(cashFare, cardTicketsRequired * 0.67);
+    }
+}