<?php

namespace crmeb\services\async\task;

use crmeb\utils\Beanstalk;
use think\facade\Config;
use think\facade\Log;


abstract class Task {
    /**
     * 得到任务 cmd 标识， 任务类别
     * 
     * @return string
     */
    abstract protected static function getCmd();

    /**
     * 执行从 beanstalkd 中取出的任务数据 $task.
     * 
     * @return boolean
     */
    abstract public static function exec(array $task);

    /**
     * 任务自由的数据都叫 params
     * 这个函数打包成任务数据
     * @return array
     */
    protected static function formatJob(array $params)
    {
        return [
            'cmd' => static::getCmd(),
            'ts'  => time(),
            'sender' => '0',
            'params' => $params,
        ];
    }

    /**
     * 插入任务到 beanstalk
     * 
     * @params 具体某个任务需要的参数
     * @return boolean
     */
    protected static function put(array $params)
    {
        $bean = Beanstalk::instance();
        $tube = Config::get('app.beanstalk_tube', 'twong');
        $arr = self::formatJob($params);
        $json = json_encode($arr);
        try {
            $bean::useTube($tube)->put($json);
        } catch (\Exception $e) {
            Log::error('beanstalk put failed: ' . $json . ' error:' . $e->getMessage());
            return false;
        }
        return true;
    }

    /**
     * job 格式基本检查
     * 
     * @return boolean
     */
    protected static function checkTask($task)
    {
        if (!$task || !isset($task['cmd']) || $task['cmd'] != self::getCmd()) {
            Log::error('task format error: null or invalid cmd');
            return false;
        }

        if (!isset($task['params']) || !is_array($task['params'])) {
            Log::error('task format error: without params or not an array.');
            return false;
        }
        return true;
    }
}