import { google } from 'googleapis';
import { Readable } from 'stream';

export async function uploadToDrive(accessToken: string, fileName: string, content: string, folderId?: string) {
  const auth = new google.auth.OAuth2();
  auth.setCredentials({ access_token: accessToken });

  const drive = google.drive({ version: 'v3', auth });

  const fileMetadata: any = {
    name: fileName,
    mimeType: 'application/vnd.google-apps.document', // Automatically convert to Google Doc
  };

  if (folderId) {
    fileMetadata.parents = [folderId];
  }

  const media = {
    mimeType: 'text/markdown',
    body: Readable.from([content]),
  };

  try {
    const response = await drive.files.create({
      requestBody: fileMetadata,
      media: media,
      fields: 'id, webViewLink'
    });
    return response.data;
  } catch (error) {
    console.error('Error uploading to Google Drive:', error);
    throw error;
  }
}

export function generateReportMarkdown(report: any) {
  let md = `# WFH Daily Report - ${new Date(report.date).toLocaleDateString()}\n`;
  md += `**Employee:** ${report.user.name}\n`;
  md += `**Manager:** ${report.managerName}\n\n`;

  md += `## Planned Tasks\n`;
  report.tasks.filter((t: any) => t.type === 'PLANNED').forEach((t: any) => {
    md += `- [ ] ${t.description} (Est: ${t.timeEstimate})\n`;
    if (t.notes) md += `  - Notes: ${t.notes}\n`;
  });

  md += `\n## Completed Tasks\n`;
  report.tasks.filter((t: any) => t.type === 'COMPLETED').forEach((t: any) => {
    md += `- [x] ${t.description}\n`;
    md += `  - Status: ${t.status}\n`;
    if (t.link) md += `  - Work Link: ${t.link}\n`;
  });

  return md;
}