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<?php

    namespace Donut\Facebook;

    use Donut\Message;


    class FacebookPost
    {
        /** @var string|NULL */
        private $message;

        /** @var string|NULL */
        private $link;

        /** @var string|NULL */
        private $picture;

        /** @var string[]|NULL */
        private $gallery;


        /**
         * @param  string|NULL
         * @param  string|NULL
         * @param  string|NULL
         * @param  string[]|NULL
         */
        public function __construct($message, $link, $picture, array $gallery = NULL)
        {
            if ($message === NULL && $link === NULL) {
                throw new \Donut\InvalidArgumentException('Musi byt uvedena alespon $message, nebo $link.');
            }

            $this->message = $message;
            $this->link = $link;
            $this->picture = $picture;
            $this->gallery = $gallery;
        }


        /**
         * @return string|NULL
         */
        public function getMessage()
        {
            return $this->message;
        }


        /**
         * @return string|NULL
         */
        public function getLink()
        {
            return $this->link;
        }


        /**
         * @return string|NULL
         */
        public function getPicture()
        {
            return $this->picture;
        }


        /**
         * @return string[]|NULL
         */
        public function getGallery()
        {
            return $this->gallery;
        }


        /**
         * @return array
         */
        public function toArray()
        {
            return array(
                'message' => $this->message,
                'link' => $this->link,
                'picture' => $this->picture,
                'gallery' => $this->gallery,
            );
        }


        /**
         * @param  array
         * @return static
         * @throws \RuntimeException
         */
        public static function fromArray(array $data)
        {
            return new static(
                isset($data['message']) ? $data['message'] : NULL,
                isset($data['link']) ? $data['link'] : NULL,
                isset($data['picture']) ? $data['picture'] : NULL,
                isset($data['gallery']) ? $data['gallery'] : NULL
            );
        }
    }