// Handle MailOdds webhook events and update Mailchimp
// Your webhook endpoint receives POST with event payload
const { event, to: email, is_bot, is_mpp } = req.body;

if (event === 'message.bounced') {
  // Add to MailOdds suppression list
  await fetch('https://api.mailodds.com/v1/suppression', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer YOUR_API_KEY',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      entries: [{ type: 'email', value: email, reason: 'hard_bounce' }]
    })
  });

  // Then archive the member in Mailchimp via their API:
  // PATCH /3.0/lists/{list_id}/members/{subscriber_hash}
  // { "status": "cleaned" }
}

if (event === 'message.opened' && !is_bot && !is_mpp) {
  // Real human open: update Mailchimp merge field LASTOPEN
  // PATCH /3.0/lists/{list_id}/members/{subscriber_hash}
  // { "merge_fields": { "LASTOPEN": new Date().toISOString() } }
}

if (event === 'message.clicked' && !is_bot) {
  // Real click: add tag "engaged-validated" via Mailchimp API
  // POST /3.0/lists/{list_id}/members/{subscriber_hash}/tags
  // { "tags": [{ "name": "engaged-validated", "status": "active" }] }
}

// Check suppression status before sending a Mailchimp campaign
const subscriberEmail = 'user@example.com'; // From your Mailchimp audience

const checkRes = await fetch('https://api.mailodds.com/v1/suppression/check', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ email: subscriberEmail })
});
const check = await checkRes.json();

if (check.suppressed) {
  // Email is on blocklist: archive in Mailchimp
  // PATCH /3.0/lists/{list_id}/members/{subscriber_hash}
  // { "status": "cleaned" }
  console.log('Suppressed:', subscriberEmail, 'Reason:', check.reason);
}

// Not suppressed: safe to include in campaign

// Fetch validation health and push to Mailchimp merge fields
const response = await fetch('https://api.mailodds.com/v1/telemetry/summary', {
  headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
});
const telemetry = await response.json();

// Update Mailchimp merge fields via their API:
// PATCH /3.0/lists/{list_id}/members/{subscriber_hash}
// {
//   "merge_fields": {
//     "VALTOTAL": telemetry.totals.validations,
//     "DELRATE": telemetry.rates.deliverable,
//     "BNCRATE": telemetry.rates.undeliverable
//   }
// }

// Bulk validate Mailchimp audience before a campaign
// Step 1: Export audience emails via Mailchimp API or CSV export
// Step 2: POST batch to MailOdds
const audienceEmails = ['user1@example.com', 'user2@example.com']; // Up to 100

const response = await fetch('https://api.mailodds.com/v1/validate/batch', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    emails: audienceEmails,
    depth: 'enhanced'
  })
});
const batch = await response.json();

// Poll GET /v1/validate/batch/{job_id} for results
// Then archive or tag subscribers based on validation outcomes
console.log('Job ID:', batch.job_id, 'Count:', audienceEmails.length);

// Monitor DMARC for your Mailchimp sending domain
const response = await fetch(
  'https://api.mailodds.com/v1/dmarc/domains/yourdomain.com/trend',
  { headers: { 'Authorization': 'Bearer YOUR_API_KEY' } }
);
const trend = await response.json();
// trend.policy, trend.data_points[].fail_percentage
// Alert if fail rate exceeds threshold

// Check sender health for domains used in Mailchimp
const response = await fetch('https://api.mailodds.com/v1/sender-health', {
  headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
});
const health = await response.json();
// health.reputation_score (0-100)
// health.bounce_rate, health.complaint_rate
// health.authentication_health

// Cross-reference Mailchimp bounces with MailOdds data
const response = await fetch('https://api.mailodds.com/v1/bounce-analyses', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    emails: mailchimpBouncedEmails // Array of bounced emails from Mailchimp
  })
});
const analysis = await response.json();
// Classify: hard_bounce, soft_bounce, complaint
// Auto-suppress confirmed hard bounces

// Identify inactive contacts for Mailchimp audience hygiene
const response = await fetch(
  'https://api.mailodds.com/v1/contacts/inactive-report?days=90',
  { headers: { 'Authorization': 'Bearer YOUR_API_KEY' } }
);
const report = await response.json();
// report.inactive_count, report.inactive_percentage
// Use to archive inactive Mailchimp subscribers