// E-mail versturen (wachtwoord-reset, nieuwsbrief, notify). Optioneel: alleen actief
// als SMTP is ingesteld — via Beheer → Instellingen (app_settings) OF env-vars.
//
// Config-bron (in deze volgorde): app_settings (ingesteld in de UI), anders env:
//   SMTP_HOST, SMTP_PORT (default 587), SMTP_USER, SMTP_PASS, SMTP_FROM (default = USER)
// Niet ingesteld → versturen valt terug op CLI (reset-admin) / wordt overgeslagen.

import nodemailer from 'nodemailer';
import { getSetting } from '../services/SettingsService.js';

function cfg() {
  const host = getSetting('smtp_host', '') || process.env.SMTP_HOST || '';
  const port = parseInt(getSetting('smtp_port', '') || process.env.SMTP_PORT || '587', 10) || 587;
  const user = getSetting('smtp_user', '') || process.env.SMTP_USER || '';
  const pass = getSetting('smtp_pass', '') || process.env.SMTP_PASS || '';
  const from = getSetting('smtp_from', '') || process.env.SMTP_FROM || user;
  return { host, port, user, pass, from };
}

export function mailerConfigured() {
  const c = cfg();
  return !!(c.host && c.user && c.pass);
}

// Status voor de UI (zonder het wachtwoord te lekken).
export function mailerStatus() {
  const c = cfg();
  return {
    configured: mailerConfigured(),
    host: c.host,
    port: c.port,
    user: c.user,
    from: c.from,
    passSet: !!c.pass,
    // bron: handig om te tonen dat env nog actief is
    fromEnv: !getSetting('smtp_host', '') && !!process.env.SMTP_HOST,
  };
}

// Transport cachen, maar herbouwen zodra de config wijzigt (UI-edit zonder herstart).
let _transport = null, _key = null;
function transport() {
  const c = cfg();
  const key = [c.host, c.port, c.user, c.pass].join('|');
  if (!_transport || _key !== key) {
    _transport = nodemailer.createTransport({
      host: c.host,
      port: c.port,
      secure: c.port === 465, // 465 = impliciete TLS; 587 = STARTTLS
      auth: { user: c.user, pass: c.pass },
    });
    _key = key;
  }
  return _transport;
}

export async function sendMail({ to, subject, text, html }) {
  if (!mailerConfigured()) throw new Error('SMTP niet geconfigureerd');
  const c = cfg();
  return transport().sendMail({ from: c.from, to, subject, text, html });
}