import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;

public class DateUtil {
    public static final String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";
    public static final String YYYY_MM_DD = "yyyy-MM-dd";
    private static final String DATE_ERROR_MSG = "日期格式不正确！当前日期格式：";
    private static final String STR_ERROR_MSG = "字符串格式不正确！当前字符串格式：";


    public static void main(String[] args) {
        System.err.println(dateToStr(new Date(), "yyyy-MM-dd HH:mm:ss"));
        System.err.println(dateToStr(new Date()));

        System.err.println(localDateTimeToStr(LocalDateTime.now(), YYYY_MM_DD_HH_MM_SS));
        System.err.println(localDateTimeToStr(LocalDateTime.now()));

        System.err.println(strToDate("2023-03-21 14:02:59"));
        System.err.println(strToDate("2023-03-21", YYYY_MM_DD));

        System.err.println(strToLocalDateTime("2023-03-21 14:20:42"));

        System.err.println(dateToLocalDateTime(new Date()));
        System.err.println(localDateTimeToDate(LocalDateTime.now()));

    }


    public static String dateToStr(Date date) {
        return dateToStr(date, YYYY_MM_DD_HH_MM_SS);
    }

    public static String dateToStr(Date date, String format) {
        String str;
        try {
            str = new SimpleDateFormat(format).format(date);
        } catch (RuntimeException e) {
            throw new RuntimeException(DATE_ERROR_MSG + format);
        }
        return str;
    }

    public static Date strToDate(String dateStr) {
        return strToDate(dateStr, YYYY_MM_DD_HH_MM_SS);

    }

    public static Date strToDate(String dateStr, String format) {
        Date date;
        try {
            date = new SimpleDateFormat(format).parse(dateStr);
        } catch (ParseException e) {
            throw new RuntimeException(STR_ERROR_MSG + dateStr);
        }
        return date;
    }

    public static String localDateTimeToStr(LocalDateTime localDateTime) {
        return localDateTimeToStr(localDateTime, YYYY_MM_DD_HH_MM_SS);
    }

    public static String localDateTimeToStr(LocalDateTime localDateTime, String format) {
        String str;
        try {
            str = DateTimeFormatter.ofPattern(format).format(localDateTime);
        } catch (RuntimeException e) {
            throw new RuntimeException(DATE_ERROR_MSG + format);
        }
        return str;
    }

    public static LocalDateTime strToLocalDateTime(String localDateTimeStr) {
        LocalDateTime localDateTime;
        try {
            localDateTime = LocalDateTime.parse(localDateTimeStr, DateTimeFormatter.ofPattern(YYYY_MM_DD_HH_MM_SS));
        } catch (RuntimeException e) {
            throw new RuntimeException(STR_ERROR_MSG + localDateTimeStr);
        }
        return localDateTime;
    }

    public static LocalDateTime dateToLocalDateTime(Date date) {
        return strToLocalDateTime(dateToStr(date));
    }

    public static Date localDateTimeToDate(LocalDateTime localDateTime) {
        return strToDate(localDateTimeToStr(localDateTime));
    }
}