Move geocoder into service folder

src/Service/Geocoder.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pcm\GeocodeBundle\Service;
+
+use Exception;
+use Pcm\GeocodeBundle\Data\LatLon;
+use Pcm\GeocodeBundle\Entity\GeocodeData;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+use Symfony\Contracts\HttpClient\ResponseInterface;
+
+class Geocoder
+{
+    private const API_URL = "https://nominatim.openstreetmap.org/search";
+
+    public function __construct(private HttpClientInterface $client) {}
+
+    /**
+     * Returns a LatLon object
+     *
+     * @param string $postcode
+     * @return GeocodeData
+     */
+    public function geocodePostcode(string $postcode): LatLon
+    {
+        $client = $this->setClientHeaders();
+        $response = $this->makeApiRequest($client, $postcode);
+        $data = $response->toArray();
+        $this->throwIfNoResponseData($data);
+
+        return $this->createGeocodeDataObject($data);
+    }
+
+    private function setClientHeaders(): HttpClientInterface
+    {
+        return $this->client->withOptions([
+            'headers' => ["User-Agent" => "Geocode"]
+        ]);
+    }
+
+    private function makeApiRequest(HttpClientInterface $client, string $postcode): ResponseInterface
+    {
+        return $client->request(
+            method: 'GET',
+            url: self::API_URL,
+            options: [
+                'query' => [
+                    'format' => 'json',
+                    'postalcode' => $postcode
+                ]
+            ]
+        );
+    }
+
+    private function throwIfNoResponseData(array $data): void
+    {
+        if (empty($data))
+            throw new Exception("No data was received from API response! Were the arguments valid?");
+    }
+
+    private function createGeocodeDataObject(array $data): LatLon
+    {
+        return new LatLon((float) $data[0]['lat'], (float) $data[0]['lon']);
+    }
+}