<?php

namespace App\Controller;

use App\Entity\Article;
use App\Enum\KindsEnum;
use App\Form\EditorType;
use App\Service\NostrClient;
use App\Util\Bech32\Bech32Decoder;
use App\Util\CommonMark\Converter;
use Doctrine\ORM\EntityManagerInterface;
use League\CommonMark\Exception\CommonMarkException;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Cache\InvalidArgumentException;
use swentel\nostr\Key\Key;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
use Symfony\Component\String\Slugger\AsciiSlugger;
use Symfony\Component\Workflow\WorkflowInterface;

class ArticleController  extends AbstractController
{
    /**
     * @throws \Exception
     */
    #[Route('/article/{naddr}', name: 'article-naddr')]
    public function naddr(NostrClient $nostrClient, Bech32Decoder $bech32Decoder, $naddr)
    {
        // decode naddr
        list($hrp, $tlv) = $bech32Decoder->decodeAndParseNostrBech32($naddr);
        if ($hrp !== 'naddr') {
            throw new \Exception('Invalid naddr');
        }
        foreach ($tlv as $item) {
            // d tag
            if ($item['type'] === 0) {
                $slug = implode('', array_map('chr', $item['value']));
            }

            // relays
            if ($item['type'] === 1) {
                $relays[] = implode('', array_map('chr', $item['value']));
            }
            // author
            if ($item['type'] === 2) {
                $str = '';
                foreach ($item['value'] as $byte) {
                    $str .= str_pad(dechex($byte), 2, '0', STR_PAD_LEFT);
                }
                $author = $str;
            }
            if ($item['type'] === 3) {
                // big-endian integer
                $intValue = 0;
                foreach ($item['value'] as $byte) {
                    $intValue = ($intValue << 8) | $byte;
                }
                $kind = $intValue;
            }
        }

        if ($kind !== KindsEnum::LONGFORM->value) {
            throw new \Exception('Not a long form article');
        }

        if (empty($relays ?? [])) {
            // get author npub relays from their config
            $relays = $nostrClient->getNpubRelays($author);
        }

        $nostrClient->getLongFormFromNaddr($slug, $relays ?? null, $author, $kind);

        if ($slug) {
            return $this->redirectToRoute('article-slug', ['slug' => $slug]);
        }

        throw new \Exception('No article.');
    }

    /**
     * @throws InvalidArgumentException|CommonMarkException
     */
    #[Route('/article/d/{slug}', name: 'article-slug')]
    public function article(EntityManagerInterface $entityManager, CacheItemPoolInterface $articlesCache,
                            NostrClient $nostrClient, Converter $converter, $slug): Response
    {
        $article = null;
        // check if an item with same eventId already exists in the db
        $repository = $entityManager->getRepository(Article::class);
        $articles = $repository->findBy(['slug' => $slug]);
        $revisions = count($articles);

        if ($revisions === 0) {
            throw $this->createNotFoundException('The article could not be found');
        }

        if ($revisions > 1) {
            // sort articles by created at date
            usort($articles, function ($a, $b) {
                return $b->getCreatedAt() <=> $a->getCreatedAt();
            });
            // get the last article
            $article = end($articles);
        } else {
            $article = $articles[0];
        }

        $cacheKey = 'article_' . $article->getId();
        $cacheItem = $articlesCache->getItem($cacheKey);
        if (!$cacheItem->isHit()) {
            $cacheItem->set($converter->convertToHtml($article->getContent()));
            $articlesCache->save($cacheItem);
        }

//        // suggestions
//        $suggestions = $repository->findBy(['pubkey' => $article->getPubkey()], ['createdAt' => 'DESC'], 3);
//        // skip current, if listed in suggestions
//        $suggestions = array_filter($suggestions, function ($s) use ($article) {
//           return $s->getId() !== $article->getId();
//        });
//        $suggestions = array_merge($suggestions, $repository->findBy([], ['createdAt' => 'DESC'], 6 - count($suggestions)));
//        // sort by date
//        usort($suggestions, function ($a, $b) {
//            return $b->getCreatedAt() <=> $a->getCreatedAt();
//        });

        try {
            $meta = $nostrClient->getNpubMetadata($article->getPubkey());
            if ($meta?->content) {
                $author = (array) json_decode($meta->content);
            } else {
                $author = [
                    'name' => '<anonymous>'
                ];
            }
        } catch (\Exception $e) {
            // Whatever?
        }


        return $this->render('Pages/article.html.twig', [
            'article' => $article,
            'author' => $author ?? null,
            'content' => $cacheItem->get(),
            //'suggestions' => $suggestions
        ]);
    }


    /**
     * Create new article
     * @throws InvalidArgumentException
     * @throws \Exception
     */
    #[Route('/article-editor/create', name: 'editor-create')]
    #[Route('/article-editor/edit/{id}', name: 'editor-edit')]
    public function newArticle(Request $request, EntityManagerInterface $entityManager, CacheItemPoolInterface $articlesCache,
                               WorkflowInterface $articlePublishingWorkflow, Article $article = null): Response
    {
        if (!$article) {
            $article = new Article();
            $article->setKind(KindsEnum::LONGFORM);
            $article->setCreatedAt(new \DateTimeImmutable());
            $formAction = $this->generateUrl('editor-create');
        } else {
            $formAction = $this->generateUrl('editor-edit', ['id' => $article->getId()]);
        }

        $form = $this->createForm(EditorType::class, $article, ['action' => $formAction]);
        $form->handleRequest($request);

        // Step 3: Check if the form is submitted and valid
        if ($form->isSubmitted() && $form->isValid()) {
            $user = $this->getUser();
            $key = new Key();
            $currentPubkey = $key->convertToHex($user->getUserIdentifier());

            if ($article->getPubkey() === null) {
                $article->setPubkey($currentPubkey);
            }

            // Check which button was clicked
            if ($form->getClickedButton() === $form->get('actions')->get('submit')) {
                // Save button was clicked, handle the "Publish" action
                $this->addFlash('success', 'Product published!');
            } elseif ($form->getClickedButton() === $form->get('actions')->get('draft')) {
                // Save and Publish button was clicked, handle the "Draft" action
                $this->addFlash('success', 'Product saved as draft!');
            } elseif ($form->getClickedButton() === $form->get('actions')->get('preview')) {
                // Preview button was clicked, handle the "Preview" action
                // construct slug from title and save to tags
                $slugger = new AsciiSlugger();
                $slug = $slugger->slug($article->getTitle())->lower();
                $article->setSig(''); // clear the sig
                $article->setSlug($slug);
                $cacheKey = 'article_' . $currentPubkey . '_' . $article->getSlug();
                $cacheItem = $articlesCache->getItem($cacheKey);
                $cacheItem->set($article);
                $articlesCache->save($cacheItem);

                return $this->redirectToRoute('article-preview', ['d' => $article->getSlug()]);
            }
        }

        // load template with content editor
        return $this->render('pages/editor.html.twig', [
            'article' => $article,
            'form' => $this->createForm(EditorType::class, $article)->createView(),
        ]);
    }

    /**
     * Preview article
     * @throws InvalidArgumentException
     * @throws CommonMarkException
     * @throws \Exception
     */
    #[Route('/article-preview/{d}', name: 'article-preview')]
    public function preview($d, Converter $converter,
                            CacheItemPoolInterface $articlesCache): Response
    {
        $user = $this->getUser();
        $key = new Key();
        $currentPubkey = $key->convertToHex($user->getUserIdentifier());

        $cacheKey = 'article_' . $currentPubkey . '_' . $d;
        $cacheItem = $articlesCache->getItem($cacheKey);
        $article = $cacheItem->get();

        $content = $converter->convertToHtml($article->getContent());

        return $this->render('pages/article.html.twig', [
            'article' => $article,
            'content' => $content,
            'author' => $user->getMetadata(),
        ]);
    }

}