import fs from 'fs';

const fileContent = fs.readFileSync('invoice.pdf');
const base64Content = fileContent.toString('base64');

await lettr.emails.send({
  from: 'you@example.com',
  to: ['recipient@example.com'],
  subject: 'Your Invoice',
  html: '<p>Please find your invoice attached.</p>',
  attachments: [
    {
      filename: 'invoice.pdf',
      content: base64Content,
      contentType: 'application/pdf'
    }
  ]
});

await lettr.emails.send({
  from: 'you@example.com',
  to: ['recipient@example.com'],
  subject: 'Project Files',
  html: '<p>Here are the requested files.</p>',
  attachments: [
    {
      filename: 'report.pdf',
      content: reportBase64,
      contentType: 'application/pdf'
    },
    {
      filename: 'data.xlsx',
      content: excelBase64,
      contentType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
    },
    {
      filename: 'image.png',
      content: imageBase64,
      contentType: 'image/png'
    }
  ]
});

await lettr.emails.send({
  from: 'you@example.com',
  to: ['recipient@example.com'],
  subject: 'Your Document',
  html: '<p>Document attached.</p>',
  attachments: [
    {
      filename: 'document.pdf',
      url: 'https://example.com/files/document.pdf'
    }
  ]
});

await lettr.emails.send({
  from: 'you@example.com',
  to: ['recipient@example.com'],
  subject: 'Email with Image',
  html: '<p>Check out this image:</p><img src="cid:logo" />',
  attachments: [
    {
      filename: 'logo.png',
      content: logoBase64,
      contentType: 'image/png',
      cid: 'logo' // Content-ID for inline reference
    }
  ]
});