awsmug/alexa-sdk

<?php

namespace Alexa\Output;
use Alexa\Output_Object;

/**
 * Class Input_Stream
 *
 * @since 1.0.0
 *
 * @package Alexa
 */
class Output_Stream implements Output_Object {
    /**
     * Version
     *
     * @since 1.0.0
     *
     * @var string
     */
    protected $version  = '1.0';

    /**
     * Session attributes
     *
     * @since 1.0.0
     *
     * @var array
     */
    private $session_attributes = array();

    /**
     * Response Object
     *
     * @since 1.0.0
     *
     * @var Response
     */
    protected $response;

    /**
     * Output_Stream constructor.
     *
     * @since 1.0.0
     */
    public function __construct() {}

    /**
     * Response object
     *
     * @since 1.0.0
     *
     * @return Response
     */
    public function response() {
        if( empty( $this->response ) ) {
            $this->response = new Response();
        }

        return $this->response;
    }

    /**
     * Setting Response version
     *
     * @since 1.0.0
     *
     * @param string $version
     */
    public function set_version( $version ) {
        $this->version = $version;
    }

    /**
     * Get Response version
     *
     * @since 1.0.0
     *
     * @return string $version
     */
    public function get_version() {
        return $this->version;
    }

    /**
     * Adding a session attribute
     *
     * @since 1.0.0
     *
     * @param string $name
     * @param string $value
     */
    public function add_session_attribute( $name, $value ) {
        $this->session_attributes[ $name ] = $value;
    }

    /**
     * Get all Session attributes
     *
     * @since 1.0.0
     *
     * @return array
     */
    public function get_session_attributes() {
        return $this->session_attributes;
    }

    /**
     * Get a specific Session attribute
     *
     * @since 1.0.0
     *
     * @param string $name
     *
     * @return bool|string
     */
    public function get_session_attribute( $name ) {
        if( ! array_key_exists( $name, $this->session_attributes ) ) {
            return false;
        }
        return $this->session_attributes[ $name ];
    }

    /**
     * Get Session attribute Object for Response to Alexa
     *
     * @since 1.0.0
     *
     * @return \stdClass
     */
    private function get_session_attributes_obj() {
        $session_attributes = new \stdClass();

        foreach( $this->get_session_attributes() AS $key => $value ) {
            $session_attributes->$key = $value;
        }

        return $session_attributes;
    }

    /**
     * Get Output Object for Alexa
     *
     * @since 1.0.0
     *
     * @return \StdClass
     */
    public function get() {
        $object = new \StdClass;

        $object->version = $this->version;

        $object->response = $this->response()->get();

        $object->sessionAttributes = $this->get_session_attributes_obj();

        return $object;
    }

    /**
     * Getting Output Object for alexa as json string
     *
     * @since 1.0.0
     *
     * @return string
     */
    public function get_json() {
        return json_encode( $this->get() );
    }
}