<?php
/**
 * Zend Framework (http://framework.zend.com/)
 *
 * @link      http://github.com/zendframework/zf2 for the canonical source repository
 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */

namespace Zend\Filter;

use Traversable;

class Callback extends AbstractFilter
{
    /**
     * @var array
     */
    protected $options = [
        'callback'        => null,
        'callback_params' => []
    ];

    /**
     * @param callable|array|Traversable $callbackOrOptions
     * @param array $callbackParams
     */
    public function __construct($callbackOrOptions = [], $callbackParams = [])
    {
        if (is_callable($callbackOrOptions) || is_string($callbackOrOptions)) {
            $this->setCallback($callbackOrOptions);
            $this->setCallbackParams($callbackParams);
        } else {
            $this->setOptions($callbackOrOptions);
        }
    }

    /**
     * Sets a new callback for this filter
     *
     * @param  callable $callback
     * @throws Exception\InvalidArgumentException
     * @return self
     */
    public function setCallback($callback)
    {
        if (is_string($callback) && class_exists($callback)) {
            $callback = new $callback();
        }

        if (! is_callable($callback)) {
            throw new Exception\InvalidArgumentException(
                'Invalid parameter for callback: must be callable'
            );
        }

        $this->options['callback'] = $callback;
        return $this;
    }

    /**
     * Returns the set callback
     *
     * @return callable
     */
    public function getCallback()
    {
        return $this->options['callback'];
    }

    /**
     * Sets parameters for the callback
     *
     * @param  array $params
     * @return self
     */
    public function setCallbackParams($params)
    {
        $this->options['callback_params'] = (array) $params;
        return $this;
    }

    /**
     * Get parameters for the callback
     *
     * @return array
     */
    public function getCallbackParams()
    {
        return $this->options['callback_params'];
    }

    /**
     * Calls the filter per callback
     *
     * @param  mixed $value Options for the set callable
     * @return mixed Result from the filter which was called
     */
    public function filter($value)
    {
        $params = (array) $this->options['callback_params'];
        array_unshift($params, $value);

        return call_user_func_array($this->options['callback'], $params);
    }
}
