<?php

namespace App\Service\Scraper;

use App\Entity\Chapter;
use App\Entity\ContentSource;
use Exception;
use GuzzleHttp\Exception\GuzzleException;
use Symfony\Component\Panther\Client as PantherClient;

class JavascriptScraper extends AbstractScraper
{
    /**
     * @throws Exception
     */
    public function scrapeChapter(Chapter $chapter, ContentSource $contentSource): array|bool
    {
        $manga = $chapter->getManga();
        $pantherClient = PantherClient::createChromeClient();
        $chapterUrl = $this->getValidChapterUrl($contentSource, $manga, $chapter->getNumber());

        if (!$chapterUrl) {
            throw new Exception("Aucune URL valide trouvée pour le chapitre {$chapter->getNumber()} du manga {$manga->getTitle()}");
        }

        $pantherClient->request('GET', $chapterUrl);

        try {
            $this->selectChapter($pantherClient, $chapter, $contentSource);

            $pageData = $contentSource->getNextPageSelector() === null
                ? $this->scrapeVerticalReaderJavascript($pantherClient, $contentSource, $chapter)
                : $this->scrapeHorizontalReaderJavascript($pantherClient, $contentSource, $chapter);

            $tempDir = sys_get_temp_dir() . '/' . uniqid('manga_scraper_');
            mkdir($tempDir);

            // Télécharger et sauvegarder les images
            foreach ($pageData as $index => &$page) {
                $imageName = sprintf('%03d.%s', $index + 1, pathinfo(parse_url($page['image_url'], PHP_URL_PATH), PATHINFO_EXTENSION));
                $imagePath = $tempDir . '/' . $imageName;

                $this->downloadAndSaveImage($page['image_url'], $imagePath);
                $this->dispatchProgressEvent($chapter, $index + 1, count($pageData));

                $page['local_image_url'] = $imagePath;
            }

            $cbzFilePath = $this->generateCbzPath($manga, $chapter);
            $this->createCbzFile($pageData, $cbzFilePath);

            $chapter->setCbzPath($cbzFilePath);
            $this->entityManager->persist($chapter);
            $this->entityManager->flush();

            $this->cleanupTempFiles($tempDir);

            return $pageData;
        } finally {
            $pantherClient->close();
        }
    }

    public function testScraping(string $mangaSlug, string $chapterNumber, ContentSource $contentSource): array
    {
        $chapterUrl = $contentSource->getChapterUrl($mangaSlug, $chapterNumber);

        if (!$this->isChapterUrlValid($chapterUrl)) {
            throw new \Exception("Invalid URL, check format and slug");
        }

        $pantherClient = PantherClient::createChromeClient();
        $pantherClient->request('GET', $chapterUrl);

        try {
            $chapter = new Chapter();
            $chapter->setNumber((float)$chapterNumber);

            $this->selectChapter($pantherClient, $chapter, $contentSource);

            return $contentSource->getNextPageSelector() === null
                ? $this->scrapeVerticalReaderJavascript($pantherClient, $contentSource, $chapter)
                : $this->scrapeHorizontalReaderJavascript($pantherClient, $contentSource, $chapter);
        } catch (Exception $e) {
            throw $e;
        } finally {
            $pantherClient->close();
        }
    }

    public function supports(string $scrapingType): bool
    {
        return $scrapingType === 'javascript';
    }

    private function selectChapter(PantherClient $pantherClient, Chapter $chapter, ContentSource $contentSource): void
    {
        $chapterSelector = $contentSource->getChapterSelector();
        if (!$chapterSelector) {
            return;
        }

        $crawler = $pantherClient->waitFor($chapterSelector);
        $select = $crawler->filter($chapterSelector);

        if ($select->count() > 0) {
            $chapterNumber = $chapter->getNumber();
            $options = $select->filter('option');
            $targetIndex = null;

            foreach ($options as $index => $option) {
                if (preg_match("/\b{$chapterNumber}\b/", $option->getText())) {
                    $targetIndex = $index;
                    break;
                }
            }

            if ($targetIndex !== null) {
                $pantherClient->executeScript("
                var select = document.querySelector('$chapterSelector');
                select.selectedIndex = $targetIndex;
                select.dispatchEvent(new Event('change'));
            ");

                $this->waitForImagesLoaded($pantherClient, $contentSource);
            } else {
                throw new Exception("Chapitre $chapterNumber non trouvé dans le menu déroulant");
            }
        }
    }

    private function waitForImagesLoaded(PantherClient $pantherClient, ContentSource $contentSource): void
    {
        $imageSelector = $contentSource->getImageSelector();
        $pantherClient->wait(30)->until(
            function ($driver) use ($imageSelector) {
                return $driver->executeScript("
                return new Promise((resolve) => {
                    let lastImageCount = 0;
                    let stableCount = 0;
                    const stableThreshold = 10;

                    function checkImages() {
                        const images = document.querySelectorAll('$imageSelector');
                        const loadedImages = Array.from(images).filter(img => img.complete && img.naturalWidth > 0);

                        if (loadedImages.length === lastImageCount) {
                            stableCount++;
                        } else {
                            stableCount = 0;
                            lastImageCount = loadedImages.length;
                        }

                        if (stableCount >= stableThreshold) {
                            resolve(true);
                        } else {
                            setTimeout(checkImages, 200);
                        }
                    }

                    checkImages();
                });
            ");
            }
        );
    }

    private function scrapeVerticalReaderJavascript(PantherClient $pantherClient, ContentSource $contentSource, Chapter $chapter): array
    {
        $pageData = [];
        $crawler = $pantherClient->waitFor($contentSource->getImageSelector());
        $images = $crawler->filter($contentSource->getImageSelector());

        foreach ($images as $index => $image) {
            $imageUrl = $image->getAttribute('src') ?: $image->getAttribute('data-src');
            $pageData[] = [
                'image_url' => $this->cleanImageUrl($imageUrl),
                'page_number' => $index + 1,
            ];
        }

        return $pageData;
    }

    private function scrapeHorizontalReaderJavascript(PantherClient $pantherClient, ContentSource $contentSource, Chapter $chapter): array
    {
        $pageData = [];
        return $pageData;
    }
}