import nodemailer from 'nodemailer';
import { injectable } from 'tsyringe';
import handlebars from 'handlebars';
import path from 'path';
import fs from 'fs';
import { fileURLToPath } from 'url';

type SendMail = {
	to: string | string[];
	subject: string;
	html: string;
};

type SendTemplate<T> = {
	to: string | string[];
	props: T;
};

@injectable()
export class MailerService {
	private nodemailer = nodemailer.createTransport({
		host: 'smtp.ethereal.email',
		port: 587,
		secure: false, // Use `true` for port 465, `false` for all other ports
		auth: {
			user: 'adella.hoppe@ethereal.email',
			pass: 'dshNQZYhATsdJ3ENke'
		}
	});

	sendEmailVerification(data: SendTemplate<{ token: string }>) {
		const template = handlebars.compile(this.getTemplate('email-verification'));
		return this.send({
			to: data.to,
			subject: 'Email Verification',
			html: template({ token: data.props.token })
		});
	}

	private async send({ to, subject, html }: SendMail) {
		const message = await this.nodemailer.sendMail({
			from: '"Example" <example@ethereal.email>', // sender address
			bcc: to,
			subject, // Subject line
			text: html,
			html
		});

		console.log(nodemailer.getTestMessageUrl(message));
	}

	private getTemplate(template: string) {
		const __filename = fileURLToPath(import.meta.url); // get the resolved path to the file
		const __dirname = path.dirname(__filename); // get the name of the directory
		return fs.readFileSync(
			path.join(__dirname, `../infrastructure/email-templates/${template}.handlebars`),
			'utf-8'
		);
	}
}