<?php
declare(strict_types=1);

namespace Esun\SeventeenTrack\Model\Api;

use Esun\SeventeenTrack\Model\Config;
use Magento\Framework\HTTP\Client\Curl;
use Magento\Framework\Serialize\Serializer\Json;

class Client
{
    private ?int $lastStatus = null;
    private ?string $lastBody = null;

    public function __construct(
        private readonly Config $config,
        private readonly Curl $curl,
        private readonly Json $json
    ) {
    }

    public function register(array $shipments): array
    {
        return $this->post('register', $shipments);
    }

    public function getTrackInfo(array $shipments): array
    {
        return $this->post('gettrackinfo', $shipments);
    }

    public function getLastStatus(): ?int
    {
        return $this->lastStatus;
    }

    public function getLastBody(): ?string
    {
        return $this->lastBody;
    }

    private function post(string $endpoint, array $payload): array
    {
        $this->lastStatus = null;
        $this->lastBody = null;
        $key = $this->config->getApiKey();
        if (!$this->config->isEnabled() || $key === '') {
            throw new \RuntimeException('17TRACK is disabled or the API key is missing.');
        }

        $this->curl->setTimeout(30);
        $this->curl->setHeaders(['Content-Type' => 'application/json', '17token' => $key]);
        $this->curl->post($this->config->getApiUrl() . '/' . $endpoint, $this->json->serialize($payload));
        $status = $this->curl->getStatus();
        $body = $this->curl->getBody();
        $this->lastStatus = $status;
        $this->lastBody = $body;
        if ($status !== 200) {
            throw new \RuntimeException(sprintf('17TRACK returned HTTP %d.', $status));
        }

        try {
            $response = $this->json->unserialize($body);
        } catch (\InvalidArgumentException $exception) {
            throw new \RuntimeException('17TRACK returned invalid JSON.', 0, $exception);
        }
        if (!is_array($response) || (int)($response['code'] ?? -1) !== 0) {
            $code = is_array($response) && isset($response['code']) ? (int)$response['code'] : 0;
            throw new \RuntimeException(
                (string)($response['message'] ?? '17TRACK request failed.'),
                $code
            );
        }
        return $response;
    }
}