interface Attachment {
  filename: string;
  content: string; // Base64-encoded string
  content_type?: string; // Optional MIME type
  disposition?: "attachment" | "inline"; // Default: 'attachment'
  content_id?: string; // Used for inline CID images
}

import { Mailofly } from "mailofly";
import * as fs from "fs";

const mailofly = new Mailofly("mfly_live_your_api_key");

const pdfBuffer = fs.readFileSync("./invoice-101.pdf");
const base64Pdf = pdfBuffer.toString("base64");

await mailofly.emails.send({
  from: "Billing <billing@yourcompany.com>",
  to: ["customer@example.com"],
  subject: "Your Monthly Receipt",
  html: "<p>Please find your receipt attached.</p>",
  attachments: [
    {
      filename: "invoice-101.pdf",
      content: base64Pdf,
      content_type: "application/pdf",
    },
  ],
});

await mailofly.emails.send({
  from: "Acme <marketing@acme.com>",
  to: ["user@example.com"],
  subject: "Welcome Gift!",
  html: `<p>Here is your badge:</p><img src="cid:badge_logo" alt="Badge" />`,
  attachments: [
    {
      filename: "badge.png",
      content: fs.readFileSync("./badge.png").toString("base64"),
      content_type: "image/png",
      disposition: "inline",
      content_id: "badge_logo",
    },
  ],
});