import { Event, User } from "@repo/db";
import nodemailer from "nodemailer";
import { renderCourseCompleted } from "./mail-templates/CourseCompleted";

let transporter: nodemailer.Transporter | null = null;

const initTransporter = () => {
	if (!process.env.MAIL_SERVER)
		return console.error("MAIL_SERVER is not defined");
	if (!process.env.MAIL_PORT) return console.error("MAIL_PORT is not defined");
	if (!process.env.MAIL_USER) return console.error("MAIL_USER is not defined");
	if (!process.env.MAIL_PASSWORD)
		return console.error("MAIL_PASSWORD is not defined");

	transporter = nodemailer.createTransport({
		host: process.env.MAIL_SERVER,
		port: parseInt(process.env.MAIL_PORT),
		secure: true, // true for 465, false for other ports
		auth: {
			user: process.env.MAIL_USER,
			pass: process.env.MAIL_PASSWORD,
		},
	});
	transporter.on("error", (err) => {
		console.error("Mail occurred:", err);
	});
	transporter.on("idle", () => {
		console.log("Mail Idle");
	});
};

initTransporter();

export const sendCourseCompletedEmail = async (
	to: string,
	user: User,
	event: Event,
) => {
	const emailHtml = await renderCourseCompleted({ user, event });

	if (!transporter) {
		console.error("Transporter is not initialized");
		return;
	}
	transporter.sendMail(
		{
			from: process.env.MAIL_USER,
			to,
			subject: `Congratulations ${user.firstname} on completing ${event.name}`,
			html: emailHtml,
		},
		(error, info) => {
			if (error) {
				console.error("Error sending email:", error);
			} else {
			}
		},
	);
};