'use strict';

/**
 * Resolves a reporting date range from either an explicit start/end pair or a
 * `month` + `year` shorthand (both 1-indexed month). Falls back to "all time"
 * when nothing is provided so the same helper can power both the lifetime and
 * the date-range/monthly reports.
 */
const resolveDateRange = ({ startDate, endDate, month, year } = {}) => {
  let start = startDate ? new Date(startDate) : null;
  let end = endDate ? new Date(endDate) : null;

  if ((!start || Number.isNaN(start.getTime())) && month != null && year != null) {
    const monthIndex = Number(month) - 1;
    const yearNumber = Number(year);
    if (Number.isInteger(monthIndex) && Number.isInteger(yearNumber)) {
      start = new Date(yearNumber, monthIndex, 1, 0, 0, 0, 0);
      end = new Date(yearNumber, monthIndex + 1, 0, 23, 59, 59, 999);
    }
  }

  if (!start || Number.isNaN(start.getTime())) {
    start = new Date(0);
  } else {
    start.setHours(0, 0, 0, 0);
  }

  if (!end || Number.isNaN(end.getTime())) {
    end = new Date();
  } else {
    end.setHours(23, 59, 59, 999);
  }

  if (start.getTime() > end.getTime()) {
    const swap = start;
    start = end;
    end = swap;
  }

  return { start, end };
};

const isWithinRange = (value, start, end) => {
  if (!value) return false;
  const date = value instanceof Date ? value : new Date(value);
  if (Number.isNaN(date.getTime())) return false;
  return date.getTime() >= start.getTime() && date.getTime() <= end.getTime();
};

module.exports = {
  resolveDateRange,
  isWithinRange
};