<?php

namespace App\Services\IceCandidate\Providers;

use App\Contracts\IceCandidateProviderInterface;
use App\DTOs\IceCandidatesDto;
use Illuminate\Support\Facades\Cache;

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

    public function getIceCandidates(): IceCandidatesDto
    {
        $cacheKey = 'convexsol_coturn_credentials_cache_'.md5(serialize($this->config));
        $cacheTtl = (int) ($this->config['cache_ttl'] ?? 600);

        $servers = Cache::remember($cacheKey, now()->addSeconds($cacheTtl), function () {
            $list = [];

            // 1. STUN servers
            $stunUrls = $this->config['stun_urls'] ?? ['stun:stun.convexsol.com:3478', 'stun:stun.l.google.com:19302'];
            if (is_string($stunUrls)) {
                $stunUrls = array_filter(array_map('trim', explode(',', $stunUrls)));
            }
            if (! empty($stunUrls)) {
                $list[] = [
                    'urls' => array_values($stunUrls),
                ];
            }

            // 2. TURN servers with username and password
            $turnUrls = $this->config['turn_urls'] ?? ['turn:turn.convexsol.com:3478', 'turns:turn.convexsol.com:5349'];
            if (is_string($turnUrls)) {
                $turnUrls = array_filter(array_map('trim', explode(',', $turnUrls)));
            }

            $username = $this->config['username'] ?? null;
            $password = $this->config['password'] ?? null;

            if (! empty($turnUrls)) {
                $turnEntry = [
                    'urls' => array_values($turnUrls),
                ];
                if ($username !== null) {
                    $turnEntry['username'] = $username;
                }
                if ($password !== null) {
                    $turnEntry['credential'] = $password;
                }
                $list[] = $turnEntry;
            }

            return $list;
        });

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