const { isString, isEmpty } = require("lodash");
const { defaultProvider } = require("@aws-sdk/credential-provider-node");
const { default: InstanceManager } = require("../utils/instanceMgr");
const aws = require("@aws-sdk/client-ses");
const nodemailer = require("nodemailer");

const isLocal = isString(process.env?.LOCALSTACK_HOSTNAME) && !isEmpty(process.env?.LOCALSTACK_HOSTNAME);

const sesConfig = {
  apiVersion: "latest",
  credentials: defaultProvider(),
  region: isLocal
    ? "ca-central-1"
    : InstanceManager({
        imex: "ca-central-1",
        rome: "us-east-2"
      })
};

if (isLocal) {
  sesConfig.endpoint = `http://${process.env.LOCALSTACK_HOSTNAME}:4566`;
  console.log(`SES Mailer set to LocalStack end point: ${sesConfig.endpoint}`);
}

const ses = new aws.SES(sesConfig);

let transporter = nodemailer.createTransport({
  SES: { ses, aws }
});

if (isLocal) {
  // Wrap the sendMail function to log the email contents to the console in local environment
  const originalSendMail = transporter.sendMail.bind(transporter);
  transporter.sendMail = async (mailOptions) => {
    try {
      const result = await originalSendMail(mailOptions);
      console.log(
        `Email sent successfully - From: ${result?.envelope?.from} - To: ${result?.envelope?.to} - MessageID ${result.messageId} - Check LocalStack to see message`
      );

      return result;
    } catch (error) {
      console.error("Failed to send email:", error);
      throw error;
    }
  };
}

module.exports = transporter;