package com.hogwartsrow.test;

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

/**
 * 复杂得日期工具类
 * @author HogwartsRow
 *
 */
public class MOEDateUtils {
	
	/**
	 * 获取某周得第一天
	 * @param year 年
	 * @param week 周
	 * @return
	 */
	public static Date getFirstDayOfWeek(int year, int week){
		Calendar c = new GregorianCalendar();
		
		c.set(Calendar.YEAR, year);
		c.set(Calendar.WEEK_OF_YEAR,  week);
		c.setFirstDayOfWeek(Calendar.MONDAY);
		c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek());
		c.set(Calendar.HOUR, 0);
		c.set(Calendar.MINUTE, 0);
		c.set(Calendar.SECOND, 0);
		
		return c.getTime(); 
	}
	
	/**
	 * 获取某周得最后一天
	 * @param year 年
	 * @param week 周
	 * @return
	 */
	public static Date getLastDayOfWeek(int year, int week){
		Calendar c = new GregorianCalendar();
		
		c.set(Calendar.YEAR, year);
		c.set(Calendar.WEEK_OF_YEAR,  week);
		c.setFirstDayOfWeek(Calendar.MONDAY);
		c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6);
		c.set(Calendar.HOUR, 23);
		c.set(Calendar.MINUTE, 59);
		c.set(Calendar.SECOND, 59);
		
		return c.getTime(); 
	}
	
	/**
	 * 获取某月得第一天
	 * @param year 年
	 * @param month 月
	 * @return
	 */
	public static Date getFirstDayOfMonth(int year, int month){
		Calendar c = new GregorianCalendar();
		
		c.set(year, month, 1);
		c.set(Calendar.HOUR, 0);
		c.set(Calendar.MINUTE, 0);
		c.set(Calendar.SECOND, 0);
		
		return c.getTime(); 
	}
	
	/**
	 * 获取某月得最后一天
	 * @param year 年
	 * @param month 月
	 * @return
	 */
	public static Date getLastDayOfMonth(int year, int month){
		Calendar c = new GregorianCalendar();
		
		c.set(year, month, 1);
		c.roll(Calendar.DATE, -1);
		c.set(Calendar.HOUR, 23);
		c.set(Calendar.MINUTE, 59);
		c.set(Calendar.SECOND, 59);
		
		return c.getTime(); 
	}
	
	/**
	 * 获取某季度得第一天
	 * @param year　年
	 * @param quarter　季度
	 * @return
	 */
	public static Date getFirstDayOfQuarter(int year, int quarter){
		Calendar c = new GregorianCalendar();
		
		int month = 0;
		switch (quarter) {
		case 1:
			month = 1-1;
			break;
		case 2:
			month = 4-1;		
			break;
		case 3:
			month = 7-1;
			break;
		case 4:
			month = 10-1;
			break;
		default:
			month = c.get(Calendar.MONTH);
			break;
		}
		
		return getFirstDayOfMonth(year, month); 
	}
	
	/**
	 * 获取某季度得最一天
	 * @param year　年
	 * @param quarter　季度
	 * @return
	 */
	public static Date getLastDayOfQuarter(int year, int quarter){
		Calendar c = new GregorianCalendar();
		
		int month = 0;
		switch (quarter) {
		case 1:
			month = 3-1;
			break;
		case 2:
			month = 6-1;		
			break;
		case 3:
			month = 9-1;
			break;
		case 4:
			month = 12-1;
			break;
		default:
			month = c.get(Calendar.MONTH);
			break;
		}
		
		return getLastDayOfMonth(year, month); 
	}
	
	/**
	 * 获取某年得第一天
	 * @param year 年
	 * @return
	 */
	public static Date getFirstDayOfYear(int year){
		return getFirstDayOfMonth(year, 0);
	}
	
	/**
	 * 获取某年得最后一天
	 * @param year 年
	 * @return
	 */
	public static Date getLastDayOfYear(int year){
		return getLastDayOfMonth(year, 11);
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		System.out.println("周一: " + getFirstDayOfWeek(2016, 25));

		System.out.println("周末: " + getLastDayOfWeek(2016, 25)); 
		
		System.out.println("月初:" + getFirstDayOfMonth(2016, 5));
		
		System.out.println("月末:" + getLastDayOfMonth(2016, 4));
		
		System.out.println("季初:" + getFirstDayOfQuarter(2016, 1));
		
		System.out.println("季末:" + getLastDayOfQuarter(2016, 2));
		
		System.out.println("年初:" + getFirstDayOfYear(2016));
		
		System.out.println("年末:" + getLastDayOfYear(2016));
		
	}

}