<?php

namespace common\components\crontabs;

use InvalidArgumentException;
use function preg_match;
use function sprintf;

/**
 * 一个任务(crontab)的实例本身
 * Class CrontabJob
 *  $commond = '* * * * * sleep 48; cd /var/www/html/mk-hyk; php yii crontab/notification >/dev/null 2>&1 & #notification-48';
 * 调用createFromCrontabLine($commond)之后的结果：
 * [
 *     [enabled] => 1
 *     [minutes] => *
 *     [hours] => *
 *     [dayOfMonth] => *
 *     [months] => *
 *     dayOfWeek] => *
 *     [taskCommandLine] => sleep 48; cd /var/www/html/qiaodangjia; php yii crontab/notification >/dev/null 2>&1 &
 *     [comments] => notification-48
 *     [shortCut] =>
 * ]
 * @package common\components\crontabs
 */
class CrontabJob
{
    /**
     * 任务是否启用
     * 禁用的状态会在命令前面加 # 符号
     * @var boolean
     */
    public $enabled = true;

    /**
     * 分钟 (0 - 59)
     * @var string/int
     */
    public $minutes;
    
    /**
     * 小时 (0 - 23)
     * @var string/int
     */
    public $hours;
    
    /**
     * 天 (1 - 31)
     * @var string/int
     */
    public $dayOfMonth;
    
    /**
     * 月 (1 - 12)
     * @var string/int
     */
    public $months;
    
    /**
     * 周一到周日,0-6，或者使用名字
     * @var tring/int
     */
    public $dayOfWeek;

    /**
     * 要被执行的任务命令行
     * @var string
     */
    public $taskCommandLine;
    
    /**
     * 可选注释，会被放在任务行的最后#符号后面
     * @var string
     */
    public $comments;
    
    /**
     * @var string
     */
    public $shortCut;
    
    /**
     * 通过任务命令行创建CrontabJob对象的工厂方法
     *
     * @param string $crontabLine
     * @throws InvalidArgumentException
     * @return CrontabJob
     */
    public static function createFromCrontabLine($crontabLine)
    {
        // Check crontab line format validity
        $crontabLineRegex = '/^[\s\t]*(#)?[\s\t]*(([*0-9,-\/]+)[\s\t]+([*0-9,-\/]+)'
            . '[\s\t]+([*0-9,-\/]+)[\s\t]+([*a-z0-9,-\/]+)[\s\t]+([*a-z0-9,-\/]+)|'
            . '(@(reboot|yearly|annually|monthly|weekly|daily|midnight|hourly)))'
            . '[\s\t]+([^#]+)([\s\t]+#(.+))?$/'
        ;

        if (!preg_match($crontabLineRegex, $crontabLine, $matches)) {
            throw new InvalidArgumentException(
                '无效的Crontab命令行, 解析失败!'
            );
        }

        // Create the job from parsed crontab line values
        $crontabJob = new self();

        if (!empty($matches[1])) {
            $crontabJob->enabled = false;
        } else {
            $crontabJob->enabled = true;
        }

        if (!empty($matches)) {
            $crontabJob->minutes = $matches[3];
            $crontabJob->hours = $matches[4];
            $crontabJob->dayOfMonth = $matches[5];
            $crontabJob->months = $matches[6];
            $crontabJob->dayOfWeek = $matches[7];
        }

        if (!empty($matches[8])) {
            $crontabJob->shortCut = $matches[9];
        }

        $crontabJob->taskCommandLine = $matches[10];
        if (!empty($matches[12])) {
            $crontabJob->comments = $matches[12];
        }

        return $crontabJob;
    }

    /**
     * 把一个CrontabJob对象实例格式化为一个可供Linux系统的任务命令行
     *
     * @throws InvalidArgumentException
     * @return String
     */
    public function formatCrontabLine()
    {
        // Check if job has a task command line
        if (!isset($this->taskCommandLine) || empty($this->taskCommandLine)) {
            throw new InvalidArgumentException(
                'CrontabJob contain\'s no task command line'
            );
        }

        $taskPlanningNotation = (isset($this->shortCut) && !empty($this->shortCut))
            ? sprintf('@%s', $this->shortCut)
            : sprintf(
                '%s %s %s %s %s',
                (isset($this->minutes) ? $this->minutes : '*'),
                (isset($this->hours) ? $this->hours : '*'),
                (isset($this->dayOfMonth) ? $this->dayOfMonth : '*'),
                (isset($this->months) ? $this->months : '*'),
                (isset($this->dayOfWeek) ? $this->dayOfWeek : '*')
            )
        ;

        return sprintf(
            '%s%s %s%s',
            ($this->enabled ? '' : '#'),
            $taskPlanningNotation,
            $this->taskCommandLine,
            (isset($this->comments) ? (' #' . $this->comments) : '')
        );
    }

    /**
     * Format the CrontabJob time format string to: * * * * *
     *
     * @throws InvalidArgumentException
     * @return String
     */
    public function formatCrontabTime()
    {
        return sprintf(
            '%s %s %s %s %s',
            (isset($this->minutes) ? $this->minutes : '*'),
            (isset($this->hours) ? $this->hours : '*'),
            (isset($this->dayOfMonth) ? $this->dayOfMonth : '*'),
            (isset($this->months) ? $this->months : '*'),
            (isset($this->dayOfWeek) ? $this->dayOfWeek : '*')
        );
    }
}