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',

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

@@ -0,0 +1,64 @@
+import { NextRequest, NextResponse } from 'next/server';
+
+export async function GET(req: NextRequest) {
+  try {
+    const { searchParams } = new URL(req.url);
+    const campaignId = searchParams.get('campaignId');
+
+    if (!campaignId) {
+      return NextResponse.json(
+        { exists: false, error: 'Chýba parameter campaignId' },
+        { status: 400 }
+      );
+    }
+
+    const apiKey = process.env.BREVO_API_KEY;
+    if (!apiKey) {
+      return NextResponse.json(
+        { exists: false, error: 'BREVO_API_KEY nie je nakonfigurovaný' },
+        { status: 500 }
+      );
+    }
+
+    const res = await fetch(`https://api.brevo.com/v3/emailCampaigns/${encodeURIComponent(campaignId)}`, {
+      method: 'GET',
+      headers: {
+        'accept': 'application/json',
+        'api-key': apiKey
+      },
+      cache: 'no-store'
+    });
+
+    if (res.status === 404) {
+      return NextResponse.json({
+        exists: false,
+        message: 'Kampaň s týmto ID v Brevo neexistuje alebo bola vymazaná.'
+      });
+    }
+
+    if (!res.ok) {
+      const errData = await res.json().catch(() => ({}));
+      return NextResponse.json({
+        exists: false,
+        error: errData.message || `Brevo API vrátilo status ${res.status}`
+      });
+    }
+
+    const data = await res.json();
+    return NextResponse.json({
+      exists: true,
+      campaignId: data.id,
+      name: data.name,
+      status: data.status,
+      subject: data.subject,
+      brevoUrl: `https://app.brevo.com/campaigns/email/edit/${data.id}`,
+      brevoListingUrl: 'https://app.brevo.com/campaigns/listing'
+    });
+  } catch (err: any) {
+    console.error('Brevo verify error:', err);
+    return NextResponse.json(
+      { exists: false, error: err.message || 'Chyba spojenia s Brevo' },
+      { status: 500 }
+    );
+  }
+}

src/app/page.tsx

@@ -370,7 +370,7 @@ export default function Home() {
     saveAs(blob, `coop-newsletter-${new Date().toISOString().split('T')[0]}.zip`);
   };
 
-  const handleExportBrevo = async () => {
+  const handleExportBrevo = async (updateExisting = false) => {
     setIsExportingBrevo(true);
     try {
       const rawHtml = renderEmailHtml(campaign);
@@ -391,14 +391,22 @@ export default function Home() {
         body: JSON.stringify({
           campaignName: `${campaign.title} - ${new Date().toLocaleDateString('sk-SK')}`,
           subject: campaign.title,
-          htmlContent: finalHtml
+          htmlContent: finalHtml,
+          updateExisting: updateExisting,
+          existingCampaignId: campaign.brevoCampaignId
         })
       });
 
       const resData = await response.json();
 
       if (resData.success && resData.campaignId) {
+        setCampaign((prev) => ({
+          ...prev,
+          brevoCampaignId: resData.campaignId,
+          status: 'exported'
+        }));
         setBrevoUrl(resData.brevoUrl);
+
         if (campaign.id) {
           await supabase
             .from('templates')
@@ -408,7 +416,12 @@ export default function Home() {
             })
             .eq('id', campaign.id);
         }
-        alert('Kampaň bola úspešne odoslaná do Brevo!');
+        alert(
+          resData.message ||
+            (updateExisting
+              ? 'Kampaň bola v Brevo úspešne aktualizovaná!'
+              : 'Kampaň bola úspešne odoslaná do Brevo!')
+        );
       } else {
         alert(`Chyba pri exporte do Brevo: ${resData.error || 'Neznáma chyba'}`);
       }
@@ -419,6 +432,17 @@ export default function Home() {
     }
   };
 
+  const handleClearBrevoId = async () => {
+    setCampaign((prev) => ({ ...prev, brevoCampaignId: undefined }));
+    setBrevoUrl(null);
+    if (campaign.id) {
+      await supabase
+        .from('templates')
+        .update({ brevo_campaign_id: null })
+        .eq('id', campaign.id);
+    }
+  };
+
   // Vybraný produkt pre editor cenoviek
   let targetProduct: ProductItem | null = null;
   if (targetProductIdForBadge && selectedModule?.data?.products) {
@@ -465,6 +489,7 @@ export default function Home() {
         isExportingBrevo={isExportingBrevo}
         brevoCampaignUrl={brevoUrl}
         brevoListingUrl="https://app.brevo.com/campaigns/listing"
+        onClearBrevoId={handleClearBrevoId}
         onAddModule={handleAddModule}
       />