Notification and parking zones

Source/ProofOfConcept/Services/ZoneDeterminatorService.cs

@@ -0,0 +1,63 @@
+using Microsoft.Extensions.Options;
+using NetTopologySuite.Features;
+using NetTopologySuite.Geometries;
+using NetTopologySuite.IO;
+using SzakatsA.Result;
+
+namespace ProofOfConcept.Services;
+
+public class ZoneDeterminatorService
+{
+    private readonly ILogger<ZoneDeterminatorService> logger;
+    private ZoneDeterminatorServiceConfiguration configuration;
+
+    private FeatureCollection parkingZones;
+    private bool initialized;
+    
+    public ZoneDeterminatorService(ILogger<ZoneDeterminatorService> logger, IOptions<ZoneDeterminatorServiceConfiguration> options)
+    {
+        this.logger = logger;
+        this.configuration = options.Value;
+        
+        this.parkingZones = new FeatureCollection();
+        this.initialized = false;
+    }
+    
+    public async Task<Result<string>> DetermineZoneCodeAsync(double latitude, double longitude, CancellationToken cancellationToken = default(CancellationToken))
+    {
+        this.logger.LogTrace("Determinating parking zone code for coordinates: {Latitude}, {Longitude}...", latitude, longitude);
+
+        if (!this.initialized)
+            await InitializeAsync(cancellationToken);
+        
+        Point point = new Point(longitude, latitude);
+        IFeature? zone = this.parkingZones.FirstOrDefault(f => f.Geometry.Contains(point));
+
+        if (zone is null)
+            return Result.Success(String.Empty);
+        else if (!zone.Attributes.Exists("zoneid"))
+            return Result.Fail(new MissingFieldException("Zone ID not found for parking zone"));
+        else if (zone.Attributes["zoneid"] is null)
+            return Result.Fail(new NullReferenceException("Zone ID null for parking zone"));
+        else if (zone.Attributes["zoneid"].ToString() is null)
+            return Result.Fail(new InvalidCastException($"Zone ID is of type {zone.Attributes["zoneID"].GetType().FullName}"));
+        else
+            return Result.Success(zone.Attributes["zoneid"].ToString()!);
+    }
+
+    private async Task InitializeAsync(CancellationToken cancellationToken = default(CancellationToken))
+    {
+        this.logger.LogTrace("Initializing...");
+        
+        string geojson = await File.ReadAllTextAsync(this.configuration.ZoneFilePath, cancellationToken);
+        GeoJsonReader reader = new GeoJsonReader();
+        this.parkingZones = reader.Read<FeatureCollection>(geojson);
+
+        this.logger.LogInformation("Initialized");
+    }
+}
+
+public class ZoneDeterminatorServiceConfiguration
+{
+    public string ZoneFilePath { get; set; } = "Resources/zones.geojson";
+}