/*
 * Copyright © Red Gate Software Ltd 2010-2020
 *
 * 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.
 */
package org.flywaydb.core.internal.util;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

Utility methods for dealing with dates.
/**
 * Utility methods for dealing with dates.
 */
public class DateUtils {
    
Prevents instantiation.
/**
     * Prevents instantiation.
     */
    private DateUtils() {
        // Do nothing
    }

    
Formats this date in the standard ISO yyyy-MM-dd HH:mm:ss format.
Params:
date – The date to format.
Returns:
The date in ISO format. An empty string if the date is null./**
     * Formats this date in the standard ISO yyyy-MM-dd HH:mm:ss format.
     *
     * @param date The date to format.
     * @return The date in ISO format. An empty string if the date is null.
     */
    public static String formatDateAsIsoString(Date date) {
        if (date == null) {
            return "";
        }
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
    }

    
Formats the time of this date in the standard ISO HH:mm:ss format.
Params:
date – The date to format.
Returns:
The time in ISO format. An empty string if the time is null./**
     * Formats the time of this date in the standard ISO HH:mm:ss format.
     *
     * @param date The date to format.
     * @return The time in ISO format. An empty string if the time is null.
     */
    public static String formatTimeAsIsoString(Date date) {
        if (date == null) {
            return "";
        }
        return new SimpleDateFormat("HH:mm:ss").format(date);
    }

    
Create a new date with this year, month and day.
Params:
year –  The year.
month – The month (1-12).
day –   The day (1-31).
Returns:
The date./**
     * Create a new date with this year, month and day.
     *
     * @param year  The year.
     * @param month The month (1-12).
     * @param day   The day (1-31).
     * @return The date.
     */
    public static Date toDate(int year, int month, int day) {
        return new GregorianCalendar(year, month - 1, day).getTime();
    }

    
Converts this date into a YYYY-MM-dd string.
Params:
date – The date.
Returns:
The matching string./**
     * Converts this date into a YYYY-MM-dd string.
     *
     * @param date The date.
     * @return The matching string.
     */
    public static String toDateString(Date date) {
        GregorianCalendar calendar = new GregorianCalendar();
        calendar.setTime(date);
        String year = "" + calendar.get(Calendar.YEAR);
        String month = StringUtils.trimOrLeftPad("" + (calendar.get(Calendar.MONTH) + 1), 2, '0');
        String day = StringUtils.trimOrLeftPad("" + calendar.get(Calendar.DAY_OF_MONTH), 2, '0');
        return year + "-" + month + "-" + day;
    }
}