<?php
namespace Util;
class CalenDar{
  //上一个月信息
  private $lastYear=null;
  private $lastMonth=null;
  //当前月信息
  private $curYear=null;
  private $curMonth=null;
  private $curWek=null;
  private $curDay=null;
  private $curDaySum=0;
  //下一个月月信息
  private $nextYear=null; //下一个月是哪一年
  private $nextMonth=null;//下一个月
  private $calendar=null;
  public function __construct($dateTime=null){
    if(isset($_get['yeal']) && is_numeric($_get['yeal'])){
      $this->curYear=$_get['yeal'];
    }else{
      $this->curYear=date('Y');
    }
    if(isset($_get['month']) && is_numeric($_get['month'])){
      $this->curMonth=$_get['month'];
    }else{
      $this->curMonth=date('n');
    }
    if(isset($_get['day']) && is_numeric($_get['day'])){
      $this->curDay=$_get['day'];
    }else{
      $this->curDay=date('j');
    }
    $this->init($dateTime);
    $this->createCalendar();
  }
  /**
  *初始化
  */
  public function init($dateTime=null){
    if(!empty($dateTime)){ //当月
      $this->curYear=date('Y',strtotime($dateTime));
      $this->curMonth=date('n',strtotime($dateTime));
      $this->curDay=date('j',strtotime($dateTime));
    }
    $this->curWek=date('w',strtotime($this->curYear.'-'.$this->curMonth.'-1'));
    //上一个月
    $this->lastMonth=$this->curMonth-1; //上一个月
    $this->lastYear=$this->curYear; //上一个月属于哪一年
    if($this->lastMonth<0){
      $this->lastMonth=12;
      $this->lastYear-=1;
    }
    //下一个月
    $this->nextMonth=$this->curMonth+1;//下一个月
    $this->nextYear=$this->curYear; //下一个月属于哪一年
    if($this->nextMonth > 12){
      $this->nextMonth=1;
      $this->nextYear+=1;
    }
  }
  public function getCalendar(){
    return $this->calendar;
  }
  /**
  *创建日历从周日 周一 周二 周三 周四 周五 周六，7*5方格,前面补上月后几天，后面补下月开始几天
  **/
  public function createCalendar(){
    //判断当月共计多少天
    $nextStr=$this->nextYear.'-'.$this->nextMonth.'-1 -1 days';
    $curDaySum=date('j',strtotime($nextStr));
    //判断上一个月最后一天是多少号
    $lastStr=$this->curYear.'-'.$this->curMonth.'-1 -1 days';
    $lastDaySum=date('j',strtotime($lastStr));
    $prefixLId=$this->lastYear.'-'.$this->lastMonth;
    $prefixCId=$this->curYear.'-'.$this->curMonth;
    $prefixNId=$this->nextYear.'-'.$this->nextMonth;
    if($this->curWek == 0){
      $lastMonthSum=7; //需要添加上个月的$lastMonthSum天
    }else{
      $lastMonthSum=$this->curWek;
    }
    $lastMonthStart=$lastDaySum - $lastMonthSum+1;
    for($i=0,$j=1,$k=1;$i<42;$i++){
      $dateInfo=array();
      if($i<$lastMonthSum){ //上一个月
        $dateInfo['day']=$lastMonthStart + $i;
        $dateInfo['type']=1;
        $id=$prefixLId.'-'.$dateInfo['day'];
        $this->calendar[]=array('id'=>$id,
                    'info'=>$dateInfo);
      }else if($j > $curDaySum){//下一个月
        $id=$prefixNId.'-'.$k;
        $dateInfo['day']=$k;
        $dateInfo['type']=3;
        $this->calendar[]=array('id'=>$id,
                    'info'=>$dateInfo);
        $k++;
      }else{//本月
        $dateInfo['day']=$j;
        $dateInfo['type']=2;
        $this->calendar[]=array('id'=>($prefixCId.'-'.$j),
                    'info'=>$dateInfo);
        $j++;
        $this->curDaySum+=1;
      }
    }
  }
  public function getDayTime(){
    return $this->curYear.'-'.$this->curMonth.'-'.$this->curDay;
  }
  /**
  *获取当前月属于哪个月
  **/
  public function getCurMonth(){
    return $this->curYear.'-'.$this->curMonth;
  }
  /**
  *获取上一个月属于哪个月
  **/
  public function getLastMonth(){
    return $this->lastYear.'-'.$this->lastMonth;
  }
  /**
  *获取下一个月属于哪个月
  **/
  public function getNextMonth(){
    return $this->nextYear.'-'.$this->nextMonth;
  }
  /**
  *判断当前月有多少天
  **/
  public function getCurDaySum(){
    return $this->curDaySum;
  }
}