draft -> pending_review -> approved -> sending -> completed
                        -> rejected -> (edit) -> pending_review (retry, max 3)
                        -> rejected -> escalated (manual review by Zavu team)
                        -> rejected_final
         approved -> scheduled -> sending -> completed
         sending -> paused (can resume)
         (any active) -> cancelled
         (any) -> failed (permanent failure)

const result = await zavu.broadcasts.create({
  name: "Black Friday Sale",
  channel: "sms", // smart | sms | sms_oneway | whatsapp | telegram | email | instagram | voice
  text: "Hi {{name}}, check out our Black Friday deals! Code: FRIDAY20",
});
const broadcastId = result.broadcast.id; // brd_xxx

result = zavu.broadcasts.create(
    name="Black Friday Sale",
    channel="sms",
    text="Hi {{name}}, check out our Black Friday deals! Code: FRIDAY20",
)
broadcast_id = result.broadcast.id

result, err := client.Broadcasts.Create(context.TODO(), zavudev.BroadcastCreateParams{
    Name:    zavudev.String("Black Friday Sale"),
    Channel: zavudev.String("sms"),
    Text:    zavudev.String("Hi {{name}}, check out our Black Friday deals! Code: FRIDAY20"),
})
broadcastID := result.Broadcast.ID

result = client.broadcasts.create(
    name: "Black Friday Sale",
    channel: "sms",
    text: "Hi {{name}}, check out our Black Friday deals! Code: FRIDAY20",
)
broadcast_id = result.broadcast.id

$result = $client->broadcasts->create([
    'name' => 'Black Friday Sale',
    'channel' => 'sms',
    'text' => 'Hi {{name}}, check out our Black Friday deals! Code: FRIDAY20',
]);
$broadcastId = $result->broadcast->id;

const result = await zavu.broadcasts.create({
  name: "Newsletter",
  channel: "email",
  emailSubject: "Special offer for {{name}}",
  text: "Hi {{name}}, check out our latest sale!",   // plain text fallback
  emailHtmlBody: "<h1>Hi {{name}}!</h1><p>Check out our latest sale.</p>",
  metadata: { campaign_id: "camp_123", region: "US" },
});

const result = await zavu.broadcasts.contacts.add({
  broadcastId: broadcastId,
  contacts: [
    { recipient: "+14155551234", templateVariables: { name: "John" } },
    { recipient: "+14155555678", templateVariables: { name: "Jane" } },
  ],
});
console.log(result.added, result.duplicates, result.invalid);

// Send immediately
await zavu.broadcasts.send({ broadcastId });

// Or schedule
await zavu.broadcasts.send({
  broadcastId,
  scheduledAt: "2024-01-15T10:00:00Z",
});

const progress = await zavu.broadcasts.progress({ broadcastId });
console.log(`${progress.percentComplete}% complete`);
console.log(`Delivered: ${progress.delivered}, Failed: ${progress.failed}, Skipped: ${progress.skipped}`);
console.log(`Estimated completion: ${progress.estimatedCompletionAt}`);

// Check remaining review attempts
const broadcast = await zavu.broadcasts.get({ broadcastId });
console.log(`Review attempts: ${broadcast.reviewAttempts}/3`);

// Edit content
await zavu.broadcasts.update({
  broadcastId,
  text: "Updated message content with {{name}}",
});

// Retry review (max 3 attempts)
await zavu.broadcasts.retryReview({ broadcastId });

// Or escalate to manual review
await zavu.broadcasts.escalate({ broadcastId });

// Reschedule
await zavu.broadcasts.reschedule({
  broadcastId, scheduledAt: "2024-01-16T14:00:00Z",
});

// Cancel (pending contacts skipped, queued may still deliver)
await zavu.broadcasts.cancel({ broadcastId });

// List contacts in broadcast
const contacts = await zavu.broadcasts.contacts.list({
  broadcastId, status: "delivered", limit: 100,
});

// Delete (draft only)
await zavu.broadcasts.delete({ broadcastId });

await zavu.broadcasts.contacts.add({
  broadcastId,
  contacts: [
    { recipient: "+14155551234", templateVariables: { name: "John", order_id: "ORD-001" } },
  ],
});