Replace calendar service with new .NET version

Calendar/Service/Controllers/CalendarController.cs

@@ -0,0 +1,27 @@
+using ChrisKaczor.HomeMonitor.Calendar.Service.Models;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ChrisKaczor.HomeMonitor.Calendar.Service.Controllers;
+
+[Route("calendar")]
+[ApiController]
+public class CalendarController(IConfiguration configuration, HttpClient httpClient) : ControllerBase
+{
+    [HttpGet("upcoming")]
+    public async Task<ActionResult<IEnumerable<CalendarEntry>>> GetUpcoming([FromQuery] int? days)
+    {
+        var data = await httpClient.GetStringAsync(configuration["Calendar:PersonalUrl"]);
+
+        var calendar = Ical.Net.Calendar.Load(data);
+
+        var start = DateTimeOffset.Now.Date;
+        var end = start.AddDays(days ?? 1);
+
+        var calendarEntries = calendar
+            .GetOccurrences(start, end)
+            .Select(o => new CalendarEntry(o))
+            .OrderBy(ce => ce.Start);
+
+        return Ok(calendarEntries);
+    }
+}