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package org.ff4j.utils;

/*-
 * #%L
 * ff4j-core
 * %%
 * Copyright (C) 2013 - 2024 FF4J
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */


import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Date;

/**
 * Utilities methods about, time & dates
 * 
 * @author Cedrick LUNVEN (@clunven)
 */
public class TimeUtils {

	/**
	 * Hide default constructor.
	 */
	private TimeUtils() {
	}

	/**
	 * Compute time for today midnight.
	 *
	 * @return
	 * 		today at midnight
	 */
	public static long getTodayMidnightTime() {
		Calendar c = Calendar.getInstance();
		c.set(Calendar.HOUR_OF_DAY, 0);
		c.set(Calendar.MINUTE, 0);
		c.set(Calendar.SECOND, 0);
		return c.getTimeInMillis();
	}

	/**
	 * Compute time for tomorrow midnight.
	 *
	 * @return
	 * 		tomorrow at midnight
	 */
	public static long getTomorrowMidnightTime() {
		Calendar c2 = Calendar.getInstance();
		c2.setTime(new Date(System.currentTimeMillis() + 1000 * 3600 * 24));
		c2.set(Calendar.HOUR_OF_DAY, 0);
		c2.set(Calendar.MINUTE, 0);
		c2.set(Calendar.SECOND, 0);
		return c2.getTimeInMillis();
	}

	/**
	 * Converts string to date using DateTimFormatter
	 * @param dateStr
	 * @param dateTimeFormatter
	 * @return converted date
	 */
	public static Date stringToDate(String dateStr,
                    DateTimeFormatter dateTimeFormatter) {
		return Date.from(LocalDateTime
                      .parse(dateStr, dateTimeFormatter)
                      .atZone(ZoneId.systemDefault()).toInstant());
	}

	/**
	 * Converts date to string using DateTimFormatter
	 * @param date
	 * @param dateTimeFormatter
	 * @return converted string
	 */
	public static String dateToString(Date date,
                         DateTimeFormatter dateTimeFormatter) {
		return LocalDateTime.ofInstant(date.toInstant(),
                    ZoneOffset.UTC).format(dateTimeFormatter);
	}
}