'use server'

import * as cheerio from 'cheerio';

export interface LinkMetadata {
  url: string;
  title?: string;
  description?: string;
  imageUrl?: string;
  siteName?: string;
}

export async function fetchLinkMetadata(url: string): Promise<LinkMetadata | null> {
  try {
    // Add protocol if missing
    let targetUrl = url;
    if (!url.startsWith('http://') && !url.startsWith('https://')) {
      targetUrl = 'https://' + url;
    }

    const response = await fetch(targetUrl, {
      headers: {
        'User-Agent': 'Mozilla/5.0 (compatible; Memento/1.0; +http://localhost:3000)',
      },
      next: { revalidate: 3600 } // Cache for 1 hour
    });

    if (!response.ok) return null;

    const html = await response.text();
    const $ = cheerio.load(html);

    const getMeta = (prop: string) => 
      $(`meta[property="${prop}"]`).attr('content') || 
      $(`meta[name="${prop}"]`).attr('content');

    const title = getMeta('og:title') || $('title').text() || '';
    const description = getMeta('og:description') || getMeta('description') || '';
    const imageUrl = getMeta('og:image');
    const siteName = getMeta('og:site_name');

    return {
      url: targetUrl,
      title: title.substring(0, 100), // Truncate if too long
      description: description.substring(0, 200),
      imageUrl,
      siteName
    };

  } catch (error) {
    console.error('Error fetching link metadata:', error);
    return null;
  }
}