$data = json_decode(file_get_contents("php://input"), true);

$phone = $data['phone'];

// 1. buscar contato
$stmt = $conn->prepare("
  SELECT c.*, cl.*
  FROM contacts c
  JOIN clients cl ON cl.id = c.client_id
  WHERE c.phone = ?
  LIMIT 1
");

$stmt->execute([$phone]);
$contact = $stmt->fetch();

// 2. fallback (cliente desconhecido)
if (!$contact) {
    echo json_encode([
        'agent' => 'default',
        'client' => null
    ]);
    exit;
}

// 3. retorna contexto
echo json_encode([
    'agent' => 'suporte',
    'client_id' => $contact['client_id'],
    'client_name' => $contact['name'],
    'vector_collection' => $contact['vector_collection']
]);