<?php
/*
  +---------------------------------------------------------------------------------+
  | Copyright (c) 2013 César Rodas                                                  |
  +---------------------------------------------------------------------------------+
  | Redistribution and use in source and binary forms, with or without              |
  | modification, are permitted provided that the following conditions are met:     |
  | 1. Redistributions of source code must retain the above copyright               |
  |    notice, this list of conditions and the following disclaimer.                |
  |                                                                                 |
  | 2. Redistributions in binary form must reproduce the above copyright            |
  |    notice, this list of conditions and the following disclaimer in the          |
  |    documentation and/or other materials provided with the distribution.         |
  |                                                                                 |
  | 3. All advertising materials mentioning features or use of this software        |
  |    must display the following acknowledgement:                                  |
  |    This product includes software developed by César D. Rodas.                  |
  |                                                                                 |
  | 4. Neither the name of the César D. Rodas nor the                               |
  |    names of its contributors may be used to endorse or promote products         |
  |    derived from this software without specific prior written permission.        |
  |                                                                                 |
  | THIS SOFTWARE IS PROVIDED BY CÉSAR D. RODAS ''AS IS'' AND ANY                   |
  | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED       |
  | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE          |
  | DISCLAIMED. IN NO EVENT SHALL CÉSAR D. RODAS BE LIABLE FOR ANY                  |
  | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES      |
  | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;    |
  | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND     |
  | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT      |
  | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS   |
  | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE                     |
  +---------------------------------------------------------------------------------+
  | Authors: César Rodas <crodas@php.net>                                           |
  +---------------------------------------------------------------------------------+
*/
namespace crodas\TextRank;

class Config
{
    protected $events = array();
    protected $listeners = array();

    public function __construct()
    {
        $this->listeners[] = new DefaultEvents;
    }

    public function on($event, Closure $callback)
    {
        if (empty($this->event[$event])) {
            $this->event[$event] = array();
        }
        $this->event[$event][] = $callback;
        return $this;
    }

    public function addListener($object)
    {
        array_unshift($this->listeners, $object);
        return $this;
    }

    public function trigger($ev, $data)
    {
        if (!empty($this->events[$ev])) {
            foreach ($this->events[$ev] as $callback) {
                $output = $callback($data);
                if (!empty($output)) {
                    return $output;
                }
            }
        }
        foreach ($this->listeners as $object) {
            $callback = array($object, $ev);
            if (is_callable($callback)) {
                $output = $object->$ev($data);
                if (!empty($output)) {
                    return $output;
                }
            }
        }

        throw new \RuntimeException("There was no handler for {$ev}");
    }

}
