import 'package:intl/intl.dart';

class AgeZodiacSignUtil {
  AgeZodiacSignUtil._();

  /// 计算星座（传入 DateTime）
  static String getZodiacSign(DateTime date) {
    int month = date.month;
    int day = date.day;

    if ((month == 3 && day >= 21) || (month == 4 && day <= 19)) {
      return '白羊座';
    } else if ((month == 4 && day >= 20) || (month == 5 && day <= 20)) {
      return '金牛座';
    } else if ((month == 5 && day >= 21) || (month == 6 && day <= 20)) {
      return '双子座';
    } else if ((month == 6 && day >= 21) || (month == 7 && day <= 22)) {
      return '巨蟹座';
    } else if ((month == 7 && day >= 23) || (month == 8 && day <= 22)) {
      return '狮子座';
    } else if ((month == 8 && day >= 23) || (month == 9 && day <= 22)) {
      return '处女座';
    } else if ((month == 9 && day >= 23) || (month == 10 && day <= 22)) {
      return '天秤座';
    } else if ((month == 10 && day >= 23) || (month == 11 && day <= 21)) {
      return '天蝎座';
    } else if ((month == 11 && day >= 22) || (month == 12 && day <= 21)) {
      return '射手座';
    } else if ((month == 12 && day >= 22) || (month == 1 && day <= 19)) {
      return '摩羯座';
    } else if ((month == 1 && day >= 20) || (month == 2 && day <= 18)) {
      return '水瓶座';
    } else if ((month == 2 && day >= 19) || (month == 3 && day <= 20)) {
      return '双鱼座';
    } else {
      return '未知星座';
    }
  }

  /// 计算年龄（传入 DateTime）
  static int calculateAge(DateTime birthDate) {
    DateTime currentDate = DateTime.now();
    int age = currentDate.year - birthDate.year;
    if (currentDate.month < birthDate.month ||
        (currentDate.month == birthDate.month && currentDate.day < birthDate.day)) {
      age--;
    }
    return age;
  }

  /// 从字符串计算星座
  static String getZodiacSignFromString(String dateStr, {String format = 'yyyy-MM-dd'}) {
    try {
      DateTime date = DateFormat(format).parse(dateStr);
      return getZodiacSign(date);
    } catch (e) {
      return '无效日期';
    }
  }

  /// 从字符串计算年龄
  static int? calculateAgeFromString(String dateStr, {String format = 'yyyy-MM-dd'}) {
    try {
      DateTime date = DateFormat(format).parse(dateStr);
      return calculateAge(date);
    } catch (e) {
      return null;
    }
  }
}