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// Extract proper DOIs
const doiRegex = /10\.\d{4,9}\/[-._;()/:a-zA-Z0-9]+/g;
const doisToFetch = new Set();
let doisMatch;
while ((doisMatch = doiRegex.exec(referencesText)) !== null) {
  let doi = doisMatch[0].replace(/\.$/, '');
  doisToFetch.add(doi);
}

const dois = Array.from(doisToFetch);
const downloaded = [];
const notDownloaded = [];

const mirrors = ['https://sci-hub.st', 'https://sci-hub.ru', 'https://sci-hub.se', 'https://sci-hub.ee'];

async function downloadPDF(doi) {
  for (const mirror of mirrors) {
    try {
       const url = `${mirror}/${doi}`;
       const resHtml = await fetch(url, {
           headers: {
               'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36'
           },
           signal: AbortSignal.timeout(10000)
       }).then(r => r.text());
       
       const srcRegex = /<iframe[^>]+src=(["'])(.*?)\1|<embed[^>]+src=(["'])(.*?)\3/i;
       const match = resHtml.match(srcRegex);
       let pdfUrl = null;
       if (match) {
          pdfUrl = match[2] || match[4];
       } else {
          const btnRegex = /onclick="location\.href='(.*?)'"/i;
          const btnMatch = resHtml.match(btnRegex);
          if (btnMatch) pdfUrl = btnMatch[1];
       }
       if (!pdfUrl) continue;

       if (pdfUrl.startsWith('//')) {
           pdfUrl = 'https:' + pdfUrl;
       } else if (pdfUrl.startsWith('/')) {
           pdfUrl = mirror + pdfUrl;
       }

       const pdfRes = await fetch(pdfUrl, {
           headers: {
               'User-Agent': 'Mozilla/5.0'
           },
           signal: AbortSignal.timeout(20000)
       });
       if (!pdfRes.ok) continue;
       
       const buffer = await pdfRes.arrayBuffer();
       if (buffer.byteLength < 5000) continue;

       const safeFilename = doi.replace(/[^a-z0-9]/gi, '_').substring(0, 100) + '.pdf';
       const dest = path.join(targetDir, safeFilename);
       await fs.writeFile(dest, Buffer.from(buffer));
       return true;
    } catch (err) {
        console.error(`Mirror ${mirror} failed for DOI ${doi}:`, err.message);
    }
  }
  return false;
}

async function run() {
  for (const doi of dois) {
     process.stdout.write(`Downloading ${doi}... `);
     const success = await downloadPDF(doi);
     if (success) {
        downloaded.push(doi);
        console.log('OK');
     } else {
        notDownloaded.push(doi);
        console.log('FAILED');
     }
     // Delay to prevent rate limiting
     await new Promise(r => setTimeout(r, 1000));
  }

  let report = '# Informe de Descarga de Artículos\n\n';
  report += '## DOIs Descargados\n\n';
  downloaded.forEach(d => report += `- ${d}\n`);
  report += '\n## DOIs No Descargados\n\n';
  notDownloaded.forEach(d => report += `- ${d}\n`);
  report += '\n## Referencias (APA 7)\n\n';
  report += referencesText.replace(/\n(?!\n)/g, '  \n');

  await fs.writeFile(path.join(targetDir, 'informe.md'), report);
  console.log('Report generated at ' + path.join(targetDir, 'informe.md'));
}

run();