Implement dynamic SMTP setting loader, admin product dependency matrix UI, recursive deselect cascade, and backend catalog validation

shop/utils/mail.ts

@@ -1,22 +1,9 @@
 // utils/mail.ts – simple wrapper around nodemailer
 import nodemailer from 'nodemailer';
-
-// Load SMTP configuration from environment variables
-const smtpConfig = {
-  host: process.env.SMTP_HOST,
-  port: Number(process.env.SMTP_PORT),
-  secure: process.env.SMTP_SECURE === 'true' || process.env.SMTP_SECURE === '1', // true for 465, false for other ports
-  auth: {
-    user: process.env.SMTP_USER,
-    pass: process.env.SMTP_PASS,
-  },
-};
-
-// Create a reusable transporter. If any required var is missing, nodemailer will throw on send.
-const transporter = nodemailer.createTransport(smtpConfig);
+import { createAdminClient } from '@/lib/supabase/admin';
 
 /**
- * Send an email.
+ * Send an email using database-configured SMTP settings (or environment variable fallback).
  * @param to Recipient address
  * @param subject Subject line
  * @param text Plain‑text body
@@ -33,12 +20,46 @@ export async function sendMail({
   text: string;
   html?: string;
 }) {
+  // Query custom SMTP settings from database
+  const supabase = createAdminClient();
+  const { data: dbSettings } = await supabase
+    .from('settings')
+    .select('*')
+    .eq('id', 'smtp')
+    .maybeSingle();
+
+  // Resolve config from DB or environment variables
+  const host = dbSettings?.host || process.env.SMTP_HOST;
+  const port = dbSettings?.port ? Number(dbSettings.port) : Number(process.env.SMTP_PORT);
+  const secure = dbSettings 
+    ? !!dbSettings.secure 
+    : (process.env.SMTP_SECURE === 'true' || process.env.SMTP_SECURE === '1');
+  const user = dbSettings?.user || process.env.SMTP_USER;
+  const pass = dbSettings?.pass || process.env.SMTP_PASS;
+
+  if (!host || !user) {
+    throw new Error('SMTP host and user must be configured (either in settings database table or environment variables).');
+  }
+
+  // Create transporter dynamically on send request
+  const transporter = nodemailer.createTransport({
+    host,
+    port,
+    secure,
+    auth: {
+      user,
+      pass,
+    },
+  });
+
   const info = await transporter.sendMail({
-    from: smtpConfig.auth.user,
+    from: user,
     to,
     subject,
     text,
     html,
   });
+
   return info;
 }
+