package com.boying.common.util;

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

public class DateUtil {

    public static Date stringDateFormat(String strDate, String format) {
        if (StringUtil.isNullOrEmpty(strDate)) {
            return null;
        }
        SimpleDateFormat sdf = null;
        if (format == null)
            sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        else
            sdf = new SimpleDateFormat(format);
        try {
            return sdf.parse(strDate);
        } catch (ParseException e) {
            return null;
        }
    }

    public static String DateToString(Date date,String format){
        if(!StringUtil.isNullOrEmpty(format)){
            SimpleDateFormat f = new SimpleDateFormat(format);
            String sDate = f.format(date);
            return sDate;
        }
        SimpleDateFormat f = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss");
        String sDate = f.format(date);
        return sDate;
    }


    public static Date getYearFirst(int year){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.set(Calendar.YEAR, year);
        Date currYearFirst = calendar.getTime();
        return currYearFirst;
    }

    /**
     * 获取某年最后一天日期
     * @param year 年份
     * @return Date
     */
    public static Date getYearLast(int year){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.set(Calendar.YEAR, year);
        calendar.roll(Calendar.DAY_OF_YEAR, -1);
        Date currYearLast = calendar.getTime();

        return currYearLast;
    }

    /**
     * 获取指定年月的第一天
     * @param year
     * @param month
     * @return
     */
    public static Date getFirstDayOfMonth(int year, int month) {
        Calendar cal = Calendar.getInstance();
        //设置年份
        cal.set(Calendar.YEAR, year);
        //设置月份
        cal.set(Calendar.MONTH, month-1);
        //获取某月最小天数
        int firstDay = cal.getMinimum(Calendar.DATE);
        //设置日历中月份的最小天数
        cal.set(Calendar.DAY_OF_MONTH,firstDay);
        return cal.getTime();
    }

    /**
     * 获取指定年月的最后一天
     * @param year
     * @param month
     * @return
     */
    public static Date getLastDayOfMonth(int year, int month) {
        Calendar cal = Calendar.getInstance();
        //设置年份
        cal.set(Calendar.YEAR, year);
        //设置月份
        cal.set(Calendar.MONTH, month-1);
        //获取某月最大天数
        int lastDay = cal.getActualMaximum(Calendar.DATE);
        //设置日历中月份的最大天数
        cal.set(Calendar.DAY_OF_MONTH, lastDay);
        return cal.getTime();
    }

    public static String getFirstTimeByDate() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar cal = Calendar.getInstance();
        String start_update = format.format(cal.getTime());
        cal.set(Calendar.HOUR_OF_DAY, cal.get(Calendar.HOUR_OF_DAY)-1);
        String end_update = format.format(cal.getTime());
        return end_update;
    }

    public static Date getToDayFirstDate() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar cal = Calendar.getInstance();
        //String start_update = format.format(cal.getTime());
        cal.set(Calendar.HOUR_OF_DAY, cal.get(Calendar.HOUR_OF_DAY)-1);
        //String end_update = format.format(cal.getTime());
        return cal.getTime();
    }
}