package com.github.lokic.javaplus;

import java.time.Instant;

import java.time.LocalDate;

import java.time.LocalDateTime;

import java.time.ZoneId;

import java.time.format.DateTimeFormatter;

import java.util.Date;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

public class Dates {

private final static Map<String, DateTimeFormatter> DATE_FORMATTER_CACHE = new ConcurrentHashMap<>();

public static LocalDateTime dateToLocalDateTime(Date date) {

Instant instant = date.toInstant();

ZoneId zone = ZoneId.systemDefault();

return LocalDateTime.ofInstant(instant, zone);

}

public static Date localDateTimeToDate(LocalDateTime localDateTime) {

ZoneId zone = ZoneId.systemDefault();

Instant instant = localDateTime.atZone(zone).toInstant();

return Date.from(instant);

}

public static String format(LocalDate localDate, String format) {

if (localDate == null) {

return null;

}

return localDate.format(getDateTimeFormatter(format));

}

public static String format(LocalDateTime localDateTime, String format) {

if (localDateTime == null) {

return null;

}

return localDateTime.format(getDateTimeFormatter(format));

}

public static LocalDate parseLocalDate(String date, String format) {

return LocalDate.parse(date, getDateTimeFormatter(format));

}

public static LocalDateTime parseLocalDateTime(String date, String format) {

return LocalDateTime.parse(date, getDateTimeFormatter(format));

}

private static DateTimeFormatter getDateTimeFormatter(String format) {

return DATE_FORMATTER_CACHE.computeIfAbsent(format, DateTimeFormatter::ofPattern);

}

}