<?php

namespace App\Jobs;

use App\Actions\FetchPageAction;
use App\Actions\RegisterDiscoveredPageAction;
use App\Enums\CrawlOutcomeEnum;
use App\Enums\PageStatusEnum;
use App\Models\PageCrawl;
use App\ValueObjects\FetchResult;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Queue\Queueable;

class ProcessCrawlJob implements ShouldQueue
{
    use Queueable;

    public function __construct(
        public PageCrawl $pageCrawl,
    ) {}

    public function handle(
        FetchPageAction $fetcher,
        RegisterDiscoveredPageAction $register,
    ): void {
        /** @var FetchResult $result */
        $result = $fetcher($this->pageCrawl->page->url);

        $this->updatePageCrawl($result);

        $update = match ($result->outcome) {
            CrawlOutcomeEnum::Rejected => [
                'status' => PageStatusEnum::Rejected,
                'fetched_at' => null,
            ],
            CrawlOutcomeEnum::Timeout => [
                'status' => PageStatusEnum::Failed,
                'failed_at' => now(),
            ],
            CrawlOutcomeEnum::Failed => [
                'status' => PageStatusEnum::Failed,
            ],
            CrawlOutcomeEnum::Blocked4xx => [
                'status' => PageStatusEnum::Failed,
                'failed_at' => now(),
            ],
            CrawlOutcomeEnum::Blocked5xx => [
                'status' => PageStatusEnum::Failed,
            ],
            CrawlOutcomeEnum::BlockedRobots => [
                'status' => PageStatusEnum::Failed,
            ],
            default => [
                'status' => PageStatusEnum::Fetched,
                'fetched_at' => now(),
                'title' => $result->title,
            ],
        };

        $this->pageCrawl->page->update($update);

        if ($result->outcome !== CrawlOutcomeEnum::Failed) {
            $result->outboundLinks->each(fn (string $url) => $register($url));
        }

        if (in_array($result->outcome, [
            CrawlOutcomeEnum::Failed,
            CrawlOutcomeEnum::Timeout,
            CrawlOutcomeEnum::Blocked5xx,
        ])) {
            $this->scheduleRetryIfNeeded($result, $this->pageCrawl);
        }
    }

    private function scheduleRetryIfNeeded(FetchResult $result, PageCrawl $crawl): void
    {
        if (PageCrawl::where('page_id', $crawl->page_id)->count() >= 3) {
            return;
        }

        $newRow = PageCrawl::withoutEvents(
            fn () => PageCrawl::create(
                array_merge($crawl->toArray(), [
                    'outcome' => null,
                ])
            )
        );

        ProcessCrawlJob::dispatch($newRow)->delay(now()->addHour());
    }

    public function updatePageCrawl(FetchResult $result): void
    {
        $outcome = CrawlOutcomeEnum::Success;
        $errorMessage = null;
        $statusCode = 200;

        if ($result->outcome === CrawlOutcomeEnum::Failed) {
            $outcome = CrawlOutcomeEnum::Failed;
            $errorMessage = $result->errorMessage;
            $statusCode = null;
        }

        $this->pageCrawl->update([
            'outcome' => $outcome,
            'completed_at' => now(),
            'status_code' => $statusCode,
            'error_message' => $errorMessage,
        ]);
    }
}