const nodemailer = require('nodemailer');
const defaultEmailConfig = require('./config').defaultEmailConfig

class EmailSender {
    /**
     * Konstruktor initialisiert Transport-Konfiguration.
     * @param {object} config - Konfiguration für den SMTP-Transport.
     */
    constructor(config = undefined) {

      if (!config) {
        config = defaultEmailConfig       
      }

        this.transporter = nodemailer.createTransport({
            host: config.host,
            port: config.port,
            secure: config.secure, // true für 465, false für andere Ports
            auth: {
                user: config.user,
                pass: config.pass
            }
        });
        this.from = config.from;
    }

    /**
     * Sendet eine E-Mail.
     * @param {object} options - Details zur E-Mail.
     * @param {string} options.to - Empfängeradresse.
     * @param {string} options.subject - Betreff der E-Mail.
     * @param {string} options.text - Nur-Text-Version.
     * @param {string} [options.html] - HTML-Version (optional).
     * @returns {Promise<void>}
     */
    async sendMail({ to, subject, text, html }) {
        try {
            const info = await this.transporter.sendMail({
                from: this.from,
                to,
                subject,
                text,
                html
            });

            console.log('E-Mail gesendet:', info.messageId);
        } catch (error) {
            console.error('Fehler beim Senden der E-Mail:', error);
            throw error;
        }
    }
    
}

module.exports = EmailSender;