<?php

namespace App\Service;

use App\Entity\Chapter;
use App\Entity\Manga;
use App\Entity\ContentSource;
use App\Event\PageScrappingProgressEvent;
use App\EventSubscriber\MangaScrapedEvent;
use Exception;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\GuzzleException;
use GuzzleHttp\Exception\RequestException;
use Symfony\Component\DomCrawler\Crawler;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\Routing\Matcher\UrlMatcher;
use Symfony\Component\Routing\RequestContext;
use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;

class MangaScraperService
{
    const string IMG_BASE_DIR = '/public/manga-images';
    private string $projectDir;
    private EventDispatcherInterface $eventDispatcher;
    private string $scrapingType = '';

    public function __construct($projectDir, EventDispatcherInterface $eventDispatcher)
    {
        $this->projectDir = $projectDir;
        $this->eventDispatcher = $eventDispatcher;
    }

    private function extractMangaPageData(string $html, ContentSource $mangaSource): array
    {
        $crawler = new Crawler($html);
        $imgUrl = $crawler->filter($mangaSource->getImageSelector())->attr('src')
            ?? $crawler->filter($mangaSource->getImageSelector())->attr('data-src');

//        dd($imgUrl);

//        if (empty($imgUrl)) {
//            throw new \Exception('No valid image found on the page.');
//        }

        $nextLink = $crawler->filter($mangaSource->getNextPageSelector());
        $nextUrl = $nextLink->count() > 0 ? $nextLink->attr('href') : null;

        // Convert relative URLs to absolute URLs
        if (!preg_match('/^https?:\/\//', $imgUrl)) {
            $urlComponents = parse_url($mangaSource->getBaseUrl());
            $scheme = $urlComponents['scheme'];
            $host = $urlComponents['host'];
            $imgUrl = $scheme . '://' . $host . '/' . ltrim($imgUrl, '/');
        }

        return [
            'image_url' => $imgUrl,
            'next_page_url' => $nextUrl,
        ];
    }

    /**
     * @throws GuzzleException
     */
    public function scrapeManga(Manga $manga, ContentSource $mangaSource): array
    {
        $allChaptersData = [];

        foreach ($manga->getChapters() as $chapter) {
            $chapterData = $this->scrapeChapter($chapter, $mangaSource);
            if ($chapterData !== false) {
                $allChaptersData[$chapter->getNumber()] = $chapterData;
            }
        }

        return $allChaptersData;
    }

    /**
     * @throws GuzzleException
     * @throws Exception
     */
    public function scrapeChapter(Chapter $chapter, ContentSource $mangaSource): array|bool
    {
        return match ($mangaSource->getScrapingType()) {
            'html' => $this->scrapeChapterHtml($chapter->getManga(), $chapter, $mangaSource),
            'javascript' => $this->scrapeChapterJavaScript($chapter->getManga(), $chapter, $mangaSource),
            'mangadex' => $this->scrapeChapterMangadex($chapter, $mangaSource),
            default => throw new Exception('Unsupported scraping type: ' . $mangaSource->getScrapingType()),
        };
    }

//    private function scrapeChapterHtml(Manga $manga, Chapter $chapter, MangaSource $mangaSource): array|bool
//    {
//        $chapterUrl = $mangaSource->getChapterUrl($manga->getTitle(), $chapter->getChapterNumber());
//        $html = $this->fetchHtml($chapterUrl);
//        $imgUrls = $this->extractMangaPageData($html);
//
//        return $this->saveChapterImages($manga, $chapter, $imgUrls);
//    }

    /**
     * @throws GuzzleException
     * @throws Exception
     */
    private function scrapeChapterMangadex(Chapter $chapter, ContentSource $mangaSource): array|bool
    {
        $this->scrapingType = 'mangadex';
        $client = new Client();
        $chapterUrl = $mangaSource->getBaseUrl() . sprintf($mangaSource->getChapterUrlFormat(), $chapter->getExternalId());
        $mangaTitle = $chapter->getManga()->getTitle();
        $chapterNumber = $chapter->getNumber();
        $pageData = [];

        $response = $client->get($chapterUrl);
        $results = json_decode($response->getBody()->getContents(), true);

        $mangaDir = sprintf('%s/%s', $this->projectDir . self::IMG_BASE_DIR, $mangaTitle);
        if (!is_dir($mangaDir)) {
            mkdir($mangaDir, 0755, true);
        }
        $chapterDir = sprintf('%s/%s', $mangaDir, $chapterNumber);
        if (!is_dir($chapterDir)) {
            mkdir($chapterDir, 0755, true);
        }

        if(count($results['chapter']['dataSaver']) === 0){
            throw new Exception('Error while fetching chapter data from Mangadex ' . $chapter->getManga()->getTitle() . ' ' . $chapter->getNumber());
        }

        if ($results['result'] === 'ok') {
            foreach ($results['chapter']['dataSaver'] as $page) {
                $pageUrl = $results['baseUrl'] . '/data-saver/' . $results['chapter']['hash'] . '/' . $page;
                // Déterminer l'extension de l'image
                $imageExtension = pathinfo(parse_url($pageUrl, PHP_URL_PATH), PATHINFO_EXTENSION);

                // Construire le nom de fichier de l'image
                $imageName = sprintf('%03d.%s', count($pageData) + 1, $imageExtension);
                $imagePath = sprintf('%s/%s', $chapterDir, $imageName);

                $this->downloadAndSaveImage($pageUrl, $imagePath);

                $event = new PageScrappingProgressEvent($chapter->getId(), count($pageData) + 1, count($results['chapter']['dataSaver']));
                $this->eventDispatcher->dispatch($event, PageScrappingProgressEvent::NAME);

                $pageData[] = [
                    'image_url' => $pageUrl,
                    'local_image_url' => sprintf('/manga-images/%s/%s/%s', $mangaTitle, $chapterNumber, $imageName),
                    'page_number' => count($pageData) + 1,
                ];
            }
        }

        $event = new MangaScrapedEvent($mangaTitle, $chapterNumber, $pageData, $chapterDir);
        $this->eventDispatcher->dispatch($event, MangaScrapedEvent::NAME);

        return $pageData;
    }

    private function scrapeChapterJavaScript(Manga $manga, Chapter $chapter, ContentSource $mangaSource): array|bool
    {
        $chapterUrl = $mangaSource->getChapterUrl($manga->getTitle(), $chapter->getNumber());
        $imgUrls = $this->fetchImagesUsingPuppeteer($chapterUrl, $mangaSource->getImageSelector(), $mangaSource->getNextPageSelector());

        return $this->saveChapterImages($manga, $chapter, $imgUrls);
    }

    private function fetchImagesUsingPuppeteer(string $url, string $imageSelector, string $nextButtonSelector): array
    {
        // Appeler le script Puppeteer avec les paramètres nécessaires
        $output = [];
        $command = sprintf('node puppeteer-script.js "%s" "%s" "%s" 2>&1', $url, $imageSelector, $nextButtonSelector); // Redirect stderr to stdout
//        dump($command);
//        exec($command, $output, $return_var);

//        dd($command, $output);

        // Convertir la sortie JSON en tableau PHP
        return json_decode(implode("", $output), true);
    }

    /**
     * @throws GuzzleException
     */
    private function scrapeChapterHtml(Manga $manga, Chapter $chapter, ContentSource $mangaSource): array|bool
    {
        $this->scrapingType = 'html';
        $chapterUrl = $mangaSource->getChapterUrl($manga->getSlug(), $chapter->getNumber());

        $pageData = [];
        $currentPageUrl = $chapterUrl;
        $mangaTitle = $manga->getTitle();
        $chapterNumber = $chapter->getNumber();

        $mangaDir = sprintf('%s/%s', $this->projectDir . self::IMG_BASE_DIR, $mangaTitle);
        if (!is_dir($mangaDir)) {
            mkdir($mangaDir, 0755, true);
        }

        $chapterDir = sprintf('%s/%s', $mangaDir, $chapterNumber);
        if (!is_dir($chapterDir)) {
            mkdir($chapterDir, 0755, true);
        }

        do {
            $html = $this->fetchHtml($currentPageUrl);
            $page = $this->extractMangaPageData($html, $mangaSource);

            // Déterminer l'extension de l'image
            $imageExtension = pathinfo(parse_url($page['image_url'], PHP_URL_PATH), PATHINFO_EXTENSION);

            // Construire le nom de fichier de l'image
            $imageName = sprintf('%03d.%s', count($pageData) + 1, $imageExtension);
            $imagePath = sprintf('%s/%s', $chapterDir, $imageName);

            $this->downloadAndSaveImage($page['image_url'], $imagePath);

            $event = new PageScrappingProgressEvent($chapter->getId(), count($pageData) + 1, 0);
            $this->eventDispatcher->dispatch($event, PageScrappingProgressEvent::NAME);

            $pageData[] = [
                'image_url' => $page['image_url'],
                'local_image_url' => sprintf('/manga-images/%s/%s/%s', $mangaTitle, $chapterNumber, $imageName),
                'page_number' => count($pageData) + 1,
            ];

            $currentPageUrl = $page['next_page_url'];
        } while ($currentPageUrl);

        $event = new MangaScrapedEvent($mangaTitle, $chapterNumber, $pageData, $chapterDir);
        $this->eventDispatcher->dispatch($event, MangaScrapedEvent::NAME);

        return $pageData;
    }

    /**
     * @throws GuzzleException
     * @throws Exception
     */
    private function fetchHtml(string $url): string
    {
        $client = new Client();

        try {
            $response = $client->get($url, [
                'http_errors' => true,
                'allow_redirects' => false
            ]);

            $statusCode = $response->getStatusCode();

            if ($statusCode >= 300 && $statusCode < 400) {
                throw new Exception('Chapter Not Found at ' . $url);
            } elseif ($statusCode == 404) {
                throw new Exception('Chapter Not Found at ' . $url);
            }

            return (string)$response->getBody();
        } catch (Exception $e) {
            throw new Exception('Bad Request: ' . $e->getMessage());
        }
    }

    /**
     * @throws GuzzleException
     */
    private function downloadAndSaveImage(string $imageUrl, string $destinationPath): void
    {
        $client = new Client();
        $startTime = microtime(true);

        try {
            $response = $client->get($imageUrl);
            $endTime = microtime(true);
            $contentType = $response->getHeaderLine('Content-Type');
            $xCacheHeader = $response->getHeaderLine('X-Cache');
            $isCached = str_starts_with($xCacheHeader, 'HIT');
            $contentLength = $response->getHeaderLine('Content-Length');

            if (str_starts_with($contentType, 'image/')) {
                file_put_contents($destinationPath, $response->getBody()->getContents());
                if ($this->scrapingType === 'mangadex') {
                    $this->sendReport($imageUrl, true, $isCached, (int)$contentLength, ($endTime - $startTime) * 1000);
                }
            } else {
                if ($this->scrapingType === 'mangadex') {
                    $this->sendReport($imageUrl, false, $isCached, (int)$contentLength, ($endTime - $startTime) * 1000);
                }
                throw new \Exception('Le contenu récupéré n\'est pas une image. Type de contenu : ' . $contentType);
            }
        } catch
        (RequestException $e) {
            throw new \Exception('Erreur lors de la récupération de l\'image : ' . $e->getMessage());
        }
    }

    private function saveChapterImages(Manga $manga, Chapter $chapter, array $imgUrls): array
    {
        $mangaTitle = $manga->getTitle();
        $chapterNumber = $chapter->getNumber();

        $mangaDir = sprintf('%s/%s', $this->projectDir . self::IMG_BASE_DIR, $mangaTitle);
        if (!is_dir($mangaDir)) {
            mkdir($mangaDir, 0755, true);
        }

        $chapterDir = sprintf('%s/%s', $mangaDir, $chapterNumber);
        if (!is_dir($chapterDir)) {
            mkdir($chapterDir, 0755, true);
        }

        $pageData = [];
        foreach ($imgUrls as $index => $imgUrl) {
            $imageName = sprintf('%03d.%s', $index + 1, pathinfo(parse_url($imgUrl, PHP_URL_PATH), PATHINFO_EXTENSION));
            $imagePath = sprintf('%s/%s', $chapterDir, $imageName);

            $this->downloadAndSaveImage($imgUrl, $imagePath);

            $pageData[] = [
                'image_url' => $imgUrl,
                'local_image_url' => sprintf('/manga-images/%s/%s/%s', $mangaTitle, $chapterNumber, $imageName),
                'page_number' => $index + 1,
            ];
        }

        $event = new MangaScrapedEvent($mangaTitle, $chapterNumber, $pageData, $chapterDir);
        $this->eventDispatcher->dispatch($event, MangaScrapedEvent::NAME);

        return $pageData;
    }

    /**
     * @throws GuzzleException
     */
    private function isChapterAvailable(string $chapterUrl, float $chapterNumber, ContentSource $mangaSource): bool
    {
        $html = $this->fetchHtml($chapterUrl);
        $crawler = new Crawler($html);
        $nextLink = $crawler->filter($mangaSource->getNextPageSelector());

        if ($nextLink->count() === 0) {
            return false;
        }

        $nextUrl = $nextLink->attr('href');
        $routeCollection = new RouteCollection();
        $routeCollection->add('manga_chapter', new Route('/scan-{manga}/{chapter}/{page}'));
        $context = new RequestContext('/');
        $matcher = new UrlMatcher($routeCollection, $context);
        $path = parse_url($nextUrl, PHP_URL_PATH);
        $parameters = $matcher->match($path);

        return (float)$parameters['chapter'] === $chapterNumber;
    }

    private function sendReport(string $imageUrl, bool $success, bool $cached, int $bytes, float $duration): void
    {
        $client = new Client();

        try {
            $client->post('https://api.mangadex.network/report', [
                'headers' => [
                    'Content-Type' => 'application/json',
                ],
                'json' => [
                    'url' => $imageUrl,
                    'success' => $success,
                    'cached' => $cached,
                    'bytes' => $bytes,
                    'duration' => $duration,
                ],
            ]);
        } catch (RequestException $e) {
            // Gérer les exceptions de requête pour le rapport
            throw new \Exception('Erreur lors de l\'envoi du rapport : ' . $e->getMessage());
        }
    }
}