<?php

declare(strict_types=1);

namespace Pcm\GeocodeBundle\Service;

use Exception;
use Pcm\GeocodeBundle\Entity\GeocodeData;
use Pcm\GeocodeBundle\Model\LatLonModel;
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 LatLonModel object
     *
     * @param string $postcode
     * @return GeocodeData
     */
    public function geocodePostcode(string $postcode): LatLonModel
    {
        $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): LatLonModel
    {
        return new LatLonModel((float) $data[0]['lat'], (float) $data[0]['lon']);
    }
}