<?php
namespace utils;

use think\facade\Db;

/**
 * 获取工作日
 */
class WorkingDay
{
    private $time = 0;
    private $holidays = [];
    public function __construct($time=0)
    {
        if (empty($time)) $this->time = time();
    }

    /**
     * 获取当前年度的节假日
     */
    private function getHolidays()
    {
        $data = Db::name('holiday')->where('year', '=', date('Y'))->column('data');
        if (empty($data)) {
            $this->holidays = [];
        }
        $this->holidays = $data;
    }

    /**
     * 获取工作日
     */
    public function getDates($adays)
    {
        // 获取节假日
        $this->getHolidays();
        
        // 组装工作日
        $ctime = $this->time;
        $days = [];
        $i = 1;
        while($adays>0) {
            $day = strtotime("+ $i day", $ctime);
            $week = date('w', $day);
            // 剔除周六周日与假日
            if (0 != $week && 6 != $week && !in_array(date('Y-m-d', $day), $this->holidays)) {
                $adays-=1;
                $days[] = date('Y-m-d H:i:s', $day);
            }
            $i+=1;
        }
        return $days;
    }

    /**
     * 获取几个工作日后日期
     */
    public function getDate($adays, $ctime = 0)
    {
        if (!empty($ctime)) {
            $this->time = $ctime;
        }
        $days = $this->getDates($adays);
        rsort($days);
        return $days[0];
    }
}