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lib/mailService.ts

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+import nodemailer from 'nodemailer';
+import moment from 'moment';
+import type { RowDataPacket } from 'mysql2';
+import pool from './mysql';
+import { checkAblauf } from './checkAblauf';
+
+// SMTP-Konfiguration via Umgebungsvariablen (Passwort niemals hart codieren!)
+const transporter = nodemailer.createTransport({
+  host: process.env.SMTP_HOST || 'smtp.1und1.de',
+  port: parseInt(process.env.SMTP_PORT || '587', 10),
+  secure: false,
+  auth: {
+    user: process.env.SMTP_USER || '',
+    pass: process.env.SMTP_PASS || '',
+  },
+});
+
+export async function doCheckAndMail(): Promise<string> {
+  const [rows] = await pool.query<RowDataPacket[]>(
+    'SELECT tab, pday, cnt, at FROM tabletten'
+  );
+
+  let body = '';
+
+  for (const item of rows) {
+    if (item.pday !== 0) {
+      const updates = checkAblauf({ cnt: item.cnt, pday: item.pday, at: item.at });
+      await pool.execute(
+        'UPDATE tabletten SET akt = ?, until = ?, warn = ? WHERE tab = ?',
+        [updates.akt, moment(updates.until).format('YYYY-MM-DD'), updates.warn ? 1 : 0, item.tab]
+      );
+      if (updates.warn) {
+        const name = item.tab.split(' ')[0];
+        body += `"${name}" wird am ${moment(updates.until).format('YYYY-MM-DD')} (in ${updates.rtage} Tagen) zu Ende sein\n`;
+      }
+    }
+  }
+
+  if (body) {
+    await transporter.sendMail({
+      from: `"Tabletten" <${process.env.SMTP_USER}>`,
+      to: process.env.MAIL_TO || '',
+      subject: 'Tabletten gehen zu Ende',
+      text: body,
+    });
+  }
+
+  return body || 'Kein Warn-Eintrag.';
+}