How to Use Gemini AI to Summarize Google Docs and Email the Results

function summarizeAndEmailGoogleDocs() {
  const folderId = '1pT5B****td'; // Replace with your folder ID
  const folder = DriveApp.getFolderById(folderId);
  const files = folder.getFilesByType(MimeType.GOOGLE_DOCS);
  const userEmail = Session.getActiveUser().getEmail(); 
  let emailBody = 'Here is a summary of the contents from the Google Docs in your folder (powered by Gemini AI):\n\n';

  while (files.hasNext()) {
    const file = files.next();
    const fileName = file.getName();
    Logger.log(`Processing file: ${fileName}`);
    
    try {
      const docId = file.getId();
      const doc = DocumentApp.openById(docId);
      const text = doc.getBody().getText();

      // Send the text to Gemini AI to get a summary
      const summary = callGeminiAI(text);
      emailBody += `---\n**${fileName}**\n${summary}\n\n`;
      
    } catch (e) {
      Logger.log(`Failed to process file: ${fileName}. Error: ${e}`);
      emailBody += `Failed to process file: ${fileName}\n\n`;
    }
  }

  // Send the email
  MailApp.sendEmail({
    to: userEmail,
    subject: 'Summary of Google Docs (Generated by Gemini AI)',
    body: emailBody
  });

  Logger.log('Email sent to ' + userEmail);
}

/**
 * Call Gemini AI API to summarize the text
 * @param {string} text - The text to summarize
 * @return {string} - The summary returned by Gemini AI
 */
function callGeminiAI(text) {
  const payload = {
    contents: [{ parts: [{ text: text }] }]
  };

  const options = {
    method: 'post',
    contentType: 'application/json',
    payload: JSON.stringify(payload)
  };

  try {
    const response = UrlFetchApp.fetch(geminiModel, options);
    const data = JSON.parse(response.getContentText());
    const summary = data["candidates"][0]["content"]["parts"][0]["text"];
    return summary;
  } catch (error) {
    Logger.log('Error calling Gemini AI: ' + error);
    return 'Failed to summarize content using Gemini AI.';
  }
}