package utils;

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

public class DateTimeUtil {
    public static final String DATE_FORMAT = "yyyy-MM-dd";
    public static final String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";

    private static DateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
    private static DateFormat dateTimeFormat = new SimpleDateFormat(DATE_TIME_FORMAT);
    private static DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern(DATE_FORMAT);
    private static DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(DATE_TIME_FORMAT);

    private static ZoneId defaultZoneId = ZoneId.systemDefault();

    /**
     * String ==> Date
     */
    public static Date stringToDate(String dateString) throws ParseException {
        return dateFormat.parse(dateString);
    }

    public static Date stringToDate(String dateString, String dateFormat) throws ParseException {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(dateFormat);
        return simpleDateFormat.parse(dateString);
    }

    /**
     * Date ==> String
     */
    public static String Date2String(Date date) {
        return dateFormat.format(date);
    }

    public static String Date2String(Date date, String dateFormat) {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(dateFormat);
        return simpleDateFormat.format(date);
    }

    /**
     * String ==> LocalDate
     */
    public static LocalDate stringToLocalDate(String dateString) {
        return LocalDate.parse(dateString, dateFormatter);
    }

    public static LocalDate stringToLocalDate(String dateString, String dateFormat) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(dateFormat);
        return LocalDate.parse(dateString, dateTimeFormatter);
    }

    /**
     * LocalDate ==> String
     */
    public static String localDateToString(LocalDate localDate) {
        return localDate.format(dateFormatter);
    }

    /**
     * String ==> LocalDateTime
     */
    public static LocalDateTime stringToLocalDateTime(String dateTimeString) {
        return LocalDateTime.parse(dateTimeString, dateTimeFormatter);
    }

    public static LocalDateTime dateStringToLocalDateTime(String dateString) {
        LocalDate localDate = LocalDate.parse(dateString, dateFormatter);
        return localDate.atStartOfDay();
    }

    /**
     * LocalDateTime ==> String
     */
    public static String LocalDateTimeToString(LocalDateTime localDateTime) {
        return localDateTime.format(dateTimeFormatter);
    }

    public static String LocalDateTimeToString(LocalDateTime localDateTime, String dateFormat) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(dateFormat);
        return localDateTime.format(dateTimeFormatter);
    }

    /**
     *  Date
     *  LocalDate       ==>     java.util.Date
     *  LocalDateTime  ( Date.from(ZonedDateTime.toInstant) )
     */
    public static Date toUtilDate(Object date) {
        if (date == null)
            return null;
        if (date instanceof java.sql.Date || date instanceof java.sql.Timestamp)
            return new Date(((Date) date).getTime());
        if (date instanceof Date)
            return (Date) date;
        if (date instanceof LocalDate)
            return Date.from(((LocalDate) date).atStartOfDay(defaultZoneId).toInstant());
        if (date instanceof LocalDateTime)
            return Date.from(((LocalDateTime) date).atZone(defaultZoneId).toInstant());
        if (date instanceof ZonedDateTime)
            return Date.from(((ZonedDateTime) date).toInstant());
        if (date instanceof Instant)
            return Date.from((Instant) date);

        throw new UnsupportedOperationException("Don't know hot to convert " + date.getClass().getName() + " to java.util.Date");
    }

    /**
     * Date ==> LocalDate
     *  .toIns
     *   (ZonedDateTime)
     */
    public static LocalDate DateToLocalDate(Date date) {
        ZonedDateTime zonedDateTime = date.toInstant().atZone(defaultZoneId);
        return zonedDateTime.toLocalDate();
    }

    /**
     * Date ==> LocalDateTime
     *   (ZonedDateTime)
     */
    public static LocalDateTime DateToLocalDateTime(Date date) {
        ZonedDateTime zonedDateTime = date.toInstant().atZone(defaultZoneId);
        return zonedDateTime.toLocalDateTime();
    }
}