<?php

require_once __DIR__.'/../bootstrap.php';

use App\Classes\ApiHandler;
use GuzzleHttp\Client;

class MastodonPostHandler extends ApiHandler
{
    private string $mastodonAccessToken;

    private string $rssFeedUrl = 'https://www.coryd.dev/feeds/syndication.xml';

    private string $baseUrl = 'https://www.coryd.dev';

    private const MASTODON_API_STATUS = 'https://follow.coryd.dev/api/v1/statuses';

    private Client $httpClient;

    public function __construct(?Client $httpClient = null)
    {
        parent::__construct();

        $this->ensureCliAccess();
        $this->mastodonAccessToken = getenv('MASTODON_ACCESS_TOKEN') ?: $_ENV['MASTODON_ACCESS_TOKEN'] ?? '';
        $this->httpClient = $httpClient ?: new Client();
        $this->validateAuthorization();
    }

    private function validateAuthorization(): void
    {
        $authHeader = $_SERVER['HTTP_AUTHORIZATION'] ?? '';
        $expectedToken = 'Bearer '.getenv('MASTODON_SYNDICATION_TOKEN');

        if ($authHeader !== $expectedToken) {
            http_response_code(401);
            echo json_encode(['error' => 'Unauthorized']);
            exit();
        }
    }

    public function handlePost(): void
    {
        if (! $this->isDatabaseAvailable()) {
            echo "Database is unavailable. Exiting.\n";

            return;
        }

        $latestItems = $this->fetchRSSFeed($this->rssFeedUrl);

        foreach (array_reverse($latestItems) as $item) {
            $existing = $this->fetchFromApi('mastodon_posts', 'link=eq.'.urlencode($item['link']));

            if (! empty($existing)) {
                continue;
            }

            $content = $this->truncateContent(
                $item['title'],
                strip_tags($item['description']),
                $item['link'],
                500
            );
            $timestamp = date('Y-m-d H:i:s');

            if (! $this->storeInDatabase($item['link'], $timestamp)) {
                echo "Skipping post: database write failed for {$item['link']}\n";

                continue;
            }

            $postedUrl = $this->postToMastodon($content, $item['image'] ?? null);

            if ($postedUrl) {
                echo "Posted: {$postedUrl}\n";
            } else {
                echo "Failed to post to Mastodon for: {$item['link']}\n";
            }
        }

        echo "RSS processed successfully.\n";
    }

    private function fetchRSSFeed(string $rssFeedUrl): array
    {
        $rssText = file_get_contents($rssFeedUrl);

        if (! $rssText) {
            throw new \Exception('Failed to fetch RSS feed.');
        }

        $rss = new \SimpleXMLElement($rssText);
        $items = [];

        foreach ($rss->channel->item as $item) {
            $items[] = [
                'title' => $this->cleanText((string) $item->title),
                'link' => (string) $item->link,
                'description' => $this->cleanText((string) $item->description),
            ];
        }

        return $items;
    }

    private function cleanText(string $text): string
    {
        $decoded = html_entity_decode($text, ENT_QUOTES | ENT_XML1, 'UTF-8');

        return mb_convert_encoding($decoded, 'UTF-8', 'UTF-8');
    }

    private function postToMastodon(string $content): ?string
    {
        $headers = [
            'Authorization' => "Bearer {$this->mastodonAccessToken}",
            'Content-Type' => 'application/json',
        ];
        $postData = ['status' => $content];
        $response = $this->httpClient->request('POST', self::MASTODON_API_STATUS, [
            'headers' => $headers,
            'json' => $postData,
        ]);

        if ($response->getStatusCode() >= 400) {
            throw new \Exception("Mastodon post failed: {$response->getBody()}");
        }

        $body = json_decode($response->getBody()->getContents(), true);

        return $body['url'] ?? null;
    }

    private function storeInDatabase(string $link, string $timestamp): bool
    {
        try {
            $this->makeRequest('POST', 'mastodon_posts', [
                'json' => [
                    'link' => $link,
                    'created_at' => $timestamp,
                ],
            ]);

            return true;
        } catch (\Exception $e) {
            echo 'Error storing post in DB: '.$e->getMessage()."\n";

            return false;
        }
    }

    private function isDatabaseAvailable(): bool
    {
        try {
            $response = $this->fetchFromApi('mastodon_posts', 'limit=1');

            return is_array($response);
        } catch (\Exception $e) {
            echo 'Database check failed: '.$e->getMessage()."\n";

            return false;
        }
    }

    private function truncateContent(string $title, string $description, string $link, int $maxLength): string
    {
        $baseLength = strlen("$title\n\n$link");
        $available = $maxLength - $baseLength - 4;

        if (strlen($description) > $available) {
            $description = substr($description, 0, $available);
            $description = preg_replace('/\s+\S*$/', '', $description).'...';
        }

        return "$title\n\n$description\n\n$link";
    }
}

try {
    $handler = new MastodonPostHandler();
    $handler->handlePost();
} catch (\Exception $e) {
    http_response_code(500);

    echo json_encode(['error' => $e->getMessage()]);
}