import { Transporter, createTransport, TransportOptions } from "nodemailer";

export default class MailHelper {
  private readonly transporter: Transporter;

  constructor() {
    this.transporter = createTransport({
      host: process.env.MAIL_HOST,
      port: Number(process.env.MAIL_PORT),
      secure: (process.env.MAIL_SECURE as "true" | "false") == "true",
      auth: {
        user: process.env.MAIL_USERNAME,
        pass: process.env.MAIL_PASSWORD,
      },
    } as TransportOptions);
  }

  /**
   * @description send mail
   * @param {string} target
   * @param {string} subject
   * @param {string} content
   * @returns {Prmose<*>}
   */
  async sendMail(target: string, subject: string, content: string): Promise<any> {
    return new Promise((resolve, reject) => {
      this.transporter
        .sendMail({
          from: `"${process.env.CLUB_NAME}" <${process.env.MAIL_USERNAME}>`,
          to: target,
          subject,
          text: content,
        })
        .then((info) => resolve(info.messageId))
        .catch((e) => reject(e));
    });
  }
}