<?php

namespace App\Services;

use Illuminate\Http\Client\Response;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use InvalidArgumentException;

final class IndexNowService
{
    /** @param array<int, string> $urls */
    public function submit(array $urls): ?Response
    {
        if (! config('indexnow.enabled')) {
            Log::info('IndexNow submission skipped: disabled.');
            return null;
        }

        $key = trim((string) config('indexnow.key'));
        if ($key === '') {
            throw new InvalidArgumentException('INDEXNOW_KEY is not configured.');
        }

        $urls = collect($urls)
            ->filter(fn ($url) => is_string($url) && filter_var($url, FILTER_VALIDATE_URL))
            ->unique()
            ->values()
            ->all();

        if ($urls === []) {
            throw new InvalidArgumentException('No valid URLs were supplied to IndexNow.');
        }

        $host = parse_url($urls[0], PHP_URL_HOST);
        if (! is_string($host) || $host === '') {
            throw new InvalidArgumentException('Could not determine the IndexNow host.');
        }

        foreach ($urls as $url) {
            if (parse_url($url, PHP_URL_HOST) !== $host) {
                throw new InvalidArgumentException('All IndexNow URLs must use the same host.');
            }
        }

        $response = Http::asJson()
            ->acceptJson()
            ->timeout(10)
            ->retry(2, 500)
            ->post((string) config('indexnow.endpoint'), [
                'host' => $host,
                'key' => $key,
                'keyLocation' => 'https://'.$host.'/'.$key.'.txt',
                'urlList' => $urls,
            ]);

        if ($response->successful()) {
            Log::info('IndexNow URLs submitted.', ['host' => $host, 'count' => count($urls), 'status' => $response->status()]);
        } else {
            Log::warning('IndexNow submission failed.', ['host' => $host, 'count' => count($urls), 'status' => $response->status(), 'body' => $response->body()]);
        }

        return $response;
    }
}