import * as nodemailer from "nodemailer";
import { MailOptions } from "nodemailer/lib/json-transport";

export class Emailer {
  private readonly transporter: nodemailer.Transporter;

  constructor() {
    this.transporter = nodemailer.createTransport({
      service: "gmail",
      auth: {
        user: process.env.NODEMAIL_MAIL,
        pass: process.env.NODEMAIL_PW,
      },
    });
  }

  public sendEmail(mailOptions: MailOptions) {
    return this.transporter.sendMail(mailOptions);
  }

  public notifyAdminForNewUser(email: string, username: string) {
    this.sendEmail(notifyAdminNewUserEmailTemplate(email, username));
  }

  public notifyUserForSignup(email: string, username: string) {
    this.sendEmail(newUserEmailTemplate(email, username));
  }
}

export const emailer = new Emailer();

export const newUserEmailTemplate = (email: string, username: string) => {
  return {
    from: process.env.GMAIL_USER,
    to: email,
    subject: `${username}, Welcome to the our website`,
    text: "Welcome to the our website",
    html: `
      <h1>Welcome to our website!</h1>
      <p>We're glad you've decided to join us. We hope you find everything you're looking for here and enjoy using our site.</p>
      <p>If you have any questions or need any help, please don't hesitate to contact us. Thank you for signing up!</p>
    `,
  } as MailOptions;
};

export const notifyAdminNewUserEmailTemplate = (
  email: string,
  username: string
) => {
  return {
    from: process.env.GMAIL_USER,
    to: process.env.GMAIL_USER,
    subject: `New User: ${username} - email: ${email}`,
    text: `New User: ${username} - email: ${email}`,
    html: `
      <h1>New User: ${username}</h1>
      <p>email: ${email}</p>
    `,
  } as MailOptions;
};