<?php

namespace App\Services\IceCandidate\Providers;

use App\Contracts\IceCandidateProviderInterface;
use App\DTOs\IceCandidatesDto;
use App\Services\IceCandidate\Validators\IceResponseValidator;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use RuntimeException;

class MeteredIceCandidateProvider implements IceCandidateProviderInterface
{
    public function __construct(
        protected array $config = []
    ) {}

    public function getIceCandidates(): IceCandidatesDto
    {
        $baseUrl = $this->config['url'] ?? config('services.metered.url');
        $apiKey = $this->config['key'] ?? config('services.metered.key');
        $timeout = (int) ($this->config['timeout'] ?? 5);
        $cacheTtl = (int) ($this->config['cache_ttl'] ?? 600);

        if (empty($baseUrl)) {
            throw new RuntimeException('Metered ICE provider URL is not configured.');
        }

        $url = $baseUrl;
        if ($apiKey && ! str_contains($url, 'apiKey=')) {
            $separator = str_contains($url, '?') ? '&' : '?';
            $url .= $separator.'apiKey='.urlencode($apiKey);
        }

        $cacheKey = 'metered_credentials_cache_'.md5($url);

        $data = Cache::remember($cacheKey, now()->addSeconds($cacheTtl), function () use ($url, $timeout) {
            $response = Http::timeout($timeout)->get($url);

            if (! $response->successful()) {
                Log::error('Metered API error response', [
                    'status' => $response->status(),
                    'body' => $response->body(),
                ]);

                throw new RuntimeException('Metered API Error: '.$response->status());
            }

            $json = $response->json();

            return IceResponseValidator::validate($json, 'Metered');
        });

        return IceCandidatesDto::fromArray($data);
    }
}