<?php


    /**
     * DatetimeFilter
     *
     * @author  glue
     * @date    30.12.14
     * @example usage
     *
     *   //In Controller: (ControllerBase etc)
     *   public function initialize(){
     *
     *       $this->filter->add( 'date', new DateTimeFilter() );
     *   }
     *   //...
     *   {
     *      $model->created_at = $this->request->getPost( "sendAt", 'date' );
     *   }
     * @subpackage
     */
    class DateTimeFilter implements \Phalcon\Filter\UserFilterInterface {

        const DefaultFormat = 'm-d-Y';

        /**
         * @var string format
         */
        protected $format = DateTime::ISO8601;


        /**
         * @param $format
         */
        function __construct( $format = self::DefaultFormat ) {
            $this->format = $format;
        }


        /**
         * Filters a value
         *
         * @param mixed $value
         *
         * @return mixed
         */
        public function filter( $value ) {
            $date = date_parse_from_format( $this->format, $value );

            return $date['error_count']? null : $value ;
        }


        /**
         * @param $value
         *
         * @return callable
         */
        public function __invoke( $value ){

            return $this->filter( $value );
        }
    }


?>