package com.chinacreator.videoalliance.order.util;

import org.apache.log4j.Logger;

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


/**
 * DateFormat.SHORT: 07-2-1 <br>
 * DateFormat.MEDIUM: 2007-2-1 <br>
 * DateFormat.LONG: 2007年2月1日 <br>
 * DateFormat.FULL: 2007年2月1日 星期四 <br>
 *
 * @author 周振华
 *
 */
public class DateUtil {

	private static final Logger log = Logger.getLogger(DateUtil.class);

	/**
	 * 获取某个月份的最后的一天
	 *
	 * @param date
	 * @return
	 */
	public static Date getLastDateOfMonth(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE));

		return calendar.getTime();
	}

	/**
	 * 获得该月的最后一天
	 *
	 * @param yearMonth
	 *            年年年年月月
	 * @return
	 */
	public static String getLastDateOfMonth(String yearMonth) {
		Calendar c = Calendar.getInstance();
		int year = c.get(Calendar.YEAR);
		int month = c.get(Calendar.MONTH);
		int date = c.get(Calendar.DATE);
		try {
			year = Integer.parseInt(yearMonth.substring(0, 4));
			month = Integer.parseInt(yearMonth.substring(4, 6)) - 1;
			date = c.get(Calendar.DATE);
		} catch (Exception e) {
			// 出现异常默认当前月
			year = c.get(Calendar.YEAR);
			month = c.get(Calendar.MONTH);
			date = c.get(Calendar.DATE);
		}
		c.set(year, month, date);

		return String.valueOf(c.getActualMaximum(Calendar.DAY_OF_MONTH));
	}

	/**
	 * 获取当月的最后一天
	 *
	 * @return
	 */
	public static int getLastDayOfCurrMonth() {
		Calendar c = Calendar.getInstance();
		int year = c.get(Calendar.YEAR);
		int month = c.get(Calendar.MONTH);
		int date = c.get(Calendar.DATE);
		c.set(year, month, date);
		return c.getActualMaximum(Calendar.DAY_OF_MONTH);
	}

	/**
	 * 把日期从String类型转化为date类型
	 * @param date
	 * @param format
	 * @return
	 */
	public static Date getDate(String date,String format){
		Date dt = null;
		try {
			dt = new SimpleDateFormat(format).parse(date);
		} catch (ParseException e) {
			log.error("要格式化的日期字符串格式不正确: "+format + date);
		}

		return dt;
	}

	/**
	 * 日期转换成字符串，如果需转换的日期为NULL，则返回为NULL（默认格式为日期）
	 *
	 * @param date
	 *            Date 需转换的日期
	 * @return String 日期字符串
	 */
	public static String formatMedium(Date date,String format) {
		SimpleDateFormat sdf = new SimpleDateFormat(format);
		return sdf.format(date);
	}

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

	/**
	 * 获得当月的第一天
	 * @return
	 */
	public static String getFirstDay(String format) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(new Date());
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		return formatMedium(calendar.getTime(),format);
	}


	public static void main(String[] args) {

	}

}