const sgMail = require("@sendgrid/mail");
const logger = require("./logger");
sgMail.setApiKey(process.env.SENDGRID_API_KEY);
const SERVICE_NAME = "Email_Service";
/**
 * @async
 * @function
 * @param {[String]} receivers  - takes an array of strings
 * @param {String} subject - takes a single string
 * @param {String} contentHTML  - takes a single string that contains HTML
 * @param {String} contentText  - takes a string to be used if contentHTML is not compatible
 * @example
 * await sendEmail(['veysel@bluewavelabs.ca','alex@bluewavelabs.ca'],'Testing Email Service','<h1>BlueWaveLabs</h1>','Testing Email Service')
 */
const sendEmail = async (
  receivers,
  subject,
  contentHTML,
  contentText = null
) => {
  const msg = {
    to: receivers,
    from: {
      name: "Uptime System",
      email: process.env.SYSTEM_EMAIL_ADDRESS, // must be verified email by sendgrid
    },
    subject: subject,
    text: contentText || contentHTML,
    html: contentHTML,
  };
  try {
    await sgMail.send(msg);
    logger.info(
      `Emails sent to receivers:${receivers} with the subject:${subject}`,
      { service: SERVICE_NAME }
    );
  } catch (error) {
    logger.error(`Sending Email action failed, ERROR:${error}`, {
      service: SERVICE_NAME,
    });
    throw error;
  }
};

module.exports = { sendEmail };