// This runs before checking the balance
function beforeTransaction(transaction) {
  const fastFoodCategory = 'Fast Food Restaurants';
  const limit = 1000; // R1k
  
  if (transaction.merchant.category !== fastFoodCategory)
  return true; // Approve transaction
  
  // Fetch and filter all transactions
  const transactions = root.transactions.all()
  .filter(tx => tx.method === 'card')
  .filter(tx => isThisMonth(tx.created_at))
  .filter(tx => tx.merchant.category === fastFoodCategory);

  // Sum spending
  let totalFastFoodSpend = transactions
  .reduce((sum, tx) => sum + tx.amount, 0);

  totalFastFoodSpend += transaction.amount;

  // Approve (true) if within limit
  return Math.abs(totalFastFoodSpend) < limit * 100;
}

// This runs before checking the balance
function beforeTransaction(transaction) {
  const merchant = transaction.merchant.name.toLowerCase();
  const allowedMerchants = ['takealot', 'orderin'];
  
  return allowedMerchants.indexOf(merchant) >= 0;
}

// This runs after a successful transaction
function afterTransaction(transaction) {
  // Lock the card after it's been used
  root.cards.lockCard(transaction.card_id);
}

// This runs after a successful transaction
function afterTransaction(transaction) {
  // Fetch and filter transactions for this month
  const transactions = root.transactions.all()
  .filter(tx => tx.method === 'card')
  .filter(tx => isThisMonth(tx.created_at));

  const groceries = filterAndSum(transactions, 'Grocery Stores');
  const restaurants = filterAndSum(transactions, 'Restaurants');
  const books = filterAndSum(transactions, 'Book Stores');

  const message = 
  `> Groceries: R${groceries}\n` + 
  `> Restaurants: R${restaurants}\n` + 
  `> Books: R${books}`;

  root.sendPush('Week Summary', message);
}