abstract class DateHelper {
  static int? monthIndexFromString(String month) {
    const monthsMap = {
      'january': 1,
      'february': 2,
      'march': 3,
      'april': 4,
      'may': 5,
      'june': 6,
      'july': 7,
      'august': 8,
      'september': 9,
      'october': 10,
      'november': 11,
      'december': 12,
    };
    return monthsMap[month.trim().toLowerCase()];
  }

  static double convertForXIndexOfYears(DateTime dt) {
    final year = dt.year;
    final monthFraction = (dt.month - 1) / 12;
    final dayFraction = dt.day / 365;
    return year + monthFraction + dayFraction;
  }

  static int getDaysInMonth(int month, int year) => switch (month) {
        // January, March, May, July, August, October, December
        1 || 3 || 5 || 7 || 8 || 10 || 12 => 31,
        // April, June, September, November
        4 || 6 || 9 || 11 => 30,
        // February
        2 => isLeapYear(year) ? 29 : 28,
        int() => throw Exception(
            'Invalid month number. Month number should be between 1 and 12.',
          ),
      };

  static bool isLeapYear(int year) {
    if (year % 4 != 0) return false;
    if (year % 100 != 0) return true;
    if (year % 400 == 0) return true;
    return false;
  }
}