const fs = require('fs');
const path = require('path');

const DATA_FILE = path.join(__dirname, '..', 'data', 'orders.json');

function readOrders() {
  try {
    const raw = fs.readFileSync(DATA_FILE, 'utf-8');
    return JSON.parse(raw);
  } catch {
    return [];
  }
}

function writeOrders(orders) {
  fs.writeFileSync(DATA_FILE, JSON.stringify(orders, null, 2), 'utf-8');
}

function findOrder(orderId) {
  const orders = readOrders();
  return orders.find(o => o.orderId === orderId) || null;
}

function saveOrder(order) {
  const orders = readOrders();
  const idx = orders.findIndex(o => o.orderId === order.orderId);
  if (idx !== -1) {
    orders[idx] = order;
  } else {
    orders.push(order);
  }
  writeOrders(orders);
}

function updateOrderStatus(orderId, status, transactionId) {
  const orders = readOrders();
  const order = orders.find(o => o.orderId === orderId);
  if (order) {
    order.status = status;
    if (transactionId) order.transactionId = transactionId;
    order.updatedAt = new Date().toISOString();
    writeOrders(orders);
  }
  return order;
}

module.exports = { readOrders, findOrder, saveOrder, updateOrderStatus };