feat: real Brevo API verifier, auto-reset if campaign missing, and update existing campaign support

src/app/api/brevo/export/route.ts

@@ -2,11 +2,18 @@ import { NextRequest, NextResponse } from 'next/server';
 
 export async function POST(req: NextRequest) {
   try {
-    const { campaignName, subject, htmlContent, scheduledAt } = await req.json();
+    const {
+      campaignName,
+      subject,
+      htmlContent,
+      scheduledAt,
+      updateExisting = false,
+      existingCampaignId
+    } = await req.json();
 
-    if (!campaignName || !subject || !htmlContent) {
+    if (!htmlContent) {
       return NextResponse.json(
-        { error: 'Chýbajú povinné polia (campaignName, subject, htmlContent).' },
+        { error: 'Chýba povinné pole htmlContent.' },
         { status: 400 }
       );
     }
@@ -22,10 +29,54 @@ export async function POST(req: NextRequest) {
       );
     }
 
-    // Volanie Brevo API v3
-    const payload: any = {
-      name: campaignName,
-      subject: subject,
+    // 1. Ak je zadané updateExisting a máme existujúce ID, skúsime aktualizovať existujúcu kampaň
+    if (updateExisting && existingCampaignId) {
+      const updatePayload: any = {
+        name: campaignName,
+        subject: subject,
+        sender: {
+          name: senderName,
+          email: senderEmail
+        },
+        htmlContent: htmlContent
+      };
+
+      if (scheduledAt) {
+        updatePayload.scheduledAt = scheduledAt;
+      }
+
+      const updateRes = await fetch(
+        `https://api.brevo.com/v3/emailCampaigns/${encodeURIComponent(existingCampaignId)}`,
+        {
+          method: 'PUT',
+          headers: {
+            'accept': 'application/json',
+            'content-type': 'application/json',
+            'api-key': apiKey
+          },
+          body: JSON.stringify(updatePayload)
+        }
+      );
+
+      if (updateRes.ok || updateRes.status === 204) {
+        return NextResponse.json({
+          success: true,
+          updated: true,
+          campaignId: Number(existingCampaignId),
+          brevoUrl: `https://app.brevo.com/campaigns/email/edit/${existingCampaignId}`,
+          brevoListingUrl: 'https://app.brevo.com/campaigns/listing',
+          message: 'Kampaň bola úspešne aktualizovaná v Brevo!'
+        });
+      }
+
+      // Ak aktualizácia zlyhala (napr. kampaň už bola odoslaná alebo neexistuje), vytvoríme novú
+      console.warn(`Update failed on campaign ${existingCampaignId}, creating a new one instead.`);
+    }
+
+    // 2. Vytvorenie novej kampane v Brevo
+    const createPayload: any = {
+      name: campaignName || 'COOP Jednota Newsletter',
+      subject: subject || 'COOP Jednota Newsletter',
       sender: {
         name: senderName,
         email: senderEmail
@@ -35,7 +86,7 @@ export async function POST(req: NextRequest) {
     };
 
     if (scheduledAt) {
-      payload.scheduledAt = scheduledAt;
+      createPayload.scheduledAt = scheduledAt;
     }
 
     const brevoRes = await fetch('https://api.brevo.com/v3/emailCampaigns', {
@@ -45,7 +96,7 @@ export async function POST(req: NextRequest) {
         'content-type': 'application/json',
         'api-key': apiKey
       },
-      body: JSON.stringify(payload)
+      body: JSON.stringify(createPayload)
     });
 
     const data = await brevoRes.json();
@@ -58,9 +109,9 @@ export async function POST(req: NextRequest) {
       );
     }
 
-    // Úspech - vrátime campaignId a priame URL na editáciu a prehľad kampaní v novom Brevo dashboarde
     return NextResponse.json({
       success: true,
+      updated: false,
       campaignId: data.id,
       brevoUrl: `https://app.brevo.com/campaigns/email/edit/${data.id}`,
       brevoListingUrl: 'https://app.brevo.com/campaigns/listing',