<?php

declare(strict_types=1);

namespace App\Lib\Axepta;

use GuzzleHttp\Exception\RequestException;
use Illuminate\Support\Facades\Cache;

class AxeptaTokenManager
{
    private const string CACHE_KEY = 'AxeptaBearerToken';

    public function __construct(
        private readonly AxeptaApiGateway $gateway,
        private readonly AxeptaConfig $config
    ) {
    }

    public function getToken(): string
    {
        if (Cache::has(self::CACHE_KEY)) {
            return Cache::get(self::CACHE_KEY);
        }

        try {
            $response = $this->gateway->postForm('/authorization/oauth/token', [
                'grant_type'    => 'client_credentials',
                'client_id'     => $this->config->merchantId,
                'client_secret' => $this->config->apiKey,
            ]);

            if ($response->getStatusCode() !== 200) {
                throw new \RuntimeException('Token request failed');
            }

            $body = json_decode($response->getBody()->getContents());

            if (json_last_error() !== JSON_ERROR_NONE || ! isset($body->access_token) || ! isset($body->expires_in)) {
                throw new \RuntimeException('Invalid token response');
            }

            Cache::put(self::CACHE_KEY, $body->access_token, $body->expires_in);

            return $body->access_token;
        } catch (RequestException $e) {
            $errorBody = $e->hasResponse() ? $e->getResponse()->getBody()->getContents() : '{}';
            $errorData = json_decode($errorBody, true);
            $message   = $errorData['error'] ?? $errorData['responseDescription'] ?? $e->getMessage();
            throw new \RuntimeException("Axepta token error: {$message}", 0, $e);
        }
    }
}