<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2015 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think;

class Hook
{

    private static $tags = [];

    /**
     * 动态添加行为扩展到某个标签
     * @param string $tag 标签名称
     * @param mixed $behavior 行为名称
     * @return void
     */
    public static function add($tag, $behavior)
    {
        if (is_array($behavior)) {
            self::$tags[$tag] = array_merge(self::$tags[$tag], $behavior);
        } else {
            self::$tags[$tag][] = $behavior;
        }
    }

    /**
     * 批量导入行为
     * @param array $tags 标签行为
     * @return void
     */
    public static function import($tags)
    {
        self::$tags = array_merge(self::$tags, $tags);
    }

    /**
     * 监听标签的行为
     * @param string $tag 标签名称
     * @param mixed $params 传入参数
     * @return void
     */
    public static function listen($tag, &$params = null)
    {
        if (isset(self::$tags[$tag])) {
            foreach (self::$tags[$tag] as $name) {

                if (APP_DEBUG) {
                    Debug::remark('behavior_start', 'time');
                }

                $result = self::exec($name, $tag, $params);

                if (APP_DEBUG) {
                    Debug::remark('behavior_end', 'time');
                    Log::record('Run ' . $name . ' [ RunTime:' . Debug::getUseTime('behavior_start', 'behavior_end') . 's ]', 'INFO');
                }
                if (false === $result) {
                    // 如果返回false 则中断行为执行
                    return;
                }
            }
        }
        return;
    }

    /**
     * 执行某个行为
     * @param string $name 行为名称
     * @param string $tag 方法名（标签名）
     * @param Mixed $params 传人的参数
     * @return void
     */
    public static function exec($name, $tag, &$params = null)
    {
        if ($name instanceof \Closure) {
            return $name($params);
        }
        $addon = new $name();
        return method_exists($addon, $tag) ? $addon->$tag($params) : $addon->run($params);
    }
}