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/**
 * Copyright (c) 2011-2020, [email protected].
 *
 * 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 com.baomidou.framework.common;

import java.util.Date;

/**
 * 
 * 相对日期格式化类
 * 
 * 
 * @author hubin
 * @Date 2016-05-05
 */
public class RelativeDateFormat {
	private static final long ONE_MINUTE = 60000L;
	private static final long ONE_HOUR = 3600000L;
	private static final long ONE_DAY = 86400000L;
	private static final long ONE_WEEK = 604800000L;
	private static final String ONE_SECOND_AGO = "秒前";
	private static final String ONE_MINUTE_AGO = "分钟前";
	private static final String ONE_HOUR_AGO = "小时前";
	private static final String ONE_DAY_AGO = "天前";
	private static final String ONE_MONTH_AGO = "月前";
	private static final String ONE_YEAR_AGO = "年前";

	/**
	 * 
	 * 日期格式为 xx 前（例如：1小时前）
	 * 
	 * 
	 * @param date
	 *            待格式化日期
	 * @return
	 */
	public static String format(Date date) {
		long delta = new Date().getTime() - date.getTime();
		if (delta < 1L * ONE_MINUTE) {
			long seconds = toSeconds(delta);
			return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_AGO;
		}
		if (delta < 45L * ONE_MINUTE) {
			long minutes = toMinutes(delta);
			return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;
		}
		if (delta < 24L * ONE_HOUR) {
			long hours = toHours(delta);
			return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;
		}
		if (delta < 48L * ONE_HOUR) {
			return "昨天";
		}
		if (delta < 30L * ONE_DAY) {
			long days = toDays(delta);
			return (days <= 0 ? 1 : days) + ONE_DAY_AGO;
		}
		if (delta < 12L * 4L * ONE_WEEK) {
			long months = toMonths(delta);
			return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;
		} else {
			long years = toYears(delta);
			return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;
		}
	}

	private static long toSeconds(long date) {
		return date / 1000L;
	}

	private static long toMinutes(long date) {
		return toSeconds(date) / 60L;
	}

	private static long toHours(long date) {
		return toMinutes(date) / 60L;
	}

	private static long toDays(long date) {
		return toHours(date) / 24L;
	}

	private static long toMonths(long date) {
		return toDays(date) / 30L;
	}

	private static long toYears(long date) {
		return toMonths(date) / 365L;
	}

}