const transactionsController = require('../controllers/transactions.controller');
const { logger } = require('../util/logger');

const transactionsRoute = async (req, res) => {
  const accountNo = req.params.accountNo;
  const { fromDate, toDate } = req.query;
  let data;
  try {
    if (fromDate && toDate) {
      if (!isValidDDMMYYYY(fromDate) || !isValidDDMMYYYY(toDate)) {
        return res.status(400).json({ error: 'INVALID_DATE_FORMAT' });
      }
      data = await transactionsController.getFiltered(
        accountNo,
        fromDate,
        toDate
      );
    } else {
      data = await transactionsController.getLastTen(accountNo);
    }
    return res.json(data);
  } catch (error) {
    logger.error('error retriving transaction history', error);
    return res
      .status(500)
      .json({ message: 'error occured while fetching transactions' });
  }
};

function isValidDDMMYYYY(dateStr) {
  if (!/^\d{8}$/.test(dateStr)) return false;

  const day = parseInt(dateStr.slice(0, 2), 10);
  const month = parseInt(dateStr.slice(2, 4), 10);
  const year = parseInt(dateStr.slice(4), 10);

  const date = new Date(year, month - 1, day);

  return (
    date.getFullYear() === year &&
    date.getMonth() === month - 1 &&
    date.getDate() === day
  );
}

module.exports = transactionsRoute;