<?php

/**
 * This code was generated by
 * \ / _    _  _|   _  _
 * | (_)\/(_)(_|\/| |(/_  v1.0.0
 * /       /
 */

namespace Twilio\Rest\Studio\V1\Flow\Engagement;

use DateTime;
use Twilio\Deserialize;
use Twilio\Exceptions\TwilioException;
use Twilio\InstanceResource;
use Twilio\Rest\Studio\V1\Flow\Engagement\Step\StepContextList;
use Twilio\Values;
use Twilio\Version;

/**
 * @property string sid
 * @property string accountSid
 * @property string flowSid
 * @property string engagementSid
 * @property string name
 * @property array context
 * @property string transitionedFrom
 * @property string transitionedTo
 * @property DateTime dateCreated
 * @property DateTime dateUpdated
 * @property string url
 * @property array links
 */
class StepInstance extends InstanceResource {
    protected $_stepContext = null;

    /**
     * Initialize the StepInstance
     * 
     * @param Version $version Version that contains the resource
     * @param mixed[] $payload The response payload
     * @param string $flowSid Flow Sid.
     * @param string $engagementSid Engagement Sid.
     * @param string $sid Step Sid.
     * @return StepInstance
     */
    public function __construct(Version $version, array $payload, $flowSid, $engagementSid, $sid = null) {
        parent::__construct($version);

        // Marshaled Properties
        $this->properties = array(
            'sid' => Values::array_get($payload, 'sid'),
            'accountSid' => Values::array_get($payload, 'account_sid'),
            'flowSid' => Values::array_get($payload, 'flow_sid'),
            'engagementSid' => Values::array_get($payload, 'engagement_sid'),
            'name' => Values::array_get($payload, 'name'),
            'context' => Values::array_get($payload, 'context'),
            'transitionedFrom' => Values::array_get($payload, 'transitioned_from'),
            'transitionedTo' => Values::array_get($payload, 'transitioned_to'),
            'dateCreated' => Deserialize::dateTime(Values::array_get($payload, 'date_created')),
            'dateUpdated' => Deserialize::dateTime(Values::array_get($payload, 'date_updated')),
            'url' => Values::array_get($payload, 'url'),
            'links' => Values::array_get($payload, 'links'),
        );

        $this->solution = array(
            'flowSid' => $flowSid,
            'engagementSid' => $engagementSid,
            'sid' => $sid ?: $this->properties['sid'],
        );
    }

    /**
     * Fetch a StepInstance
     *
     * @return StepInstance Fetched StepInstance
     * @throws TwilioException When an HTTP error occurs.
     */
    public function fetch() {
        return $this->proxy()->fetch();
    }

    /**
     * Generate an instance context for the instance, the context is capable of
     * performing various actions.  All instance actions are proxied to the context
     *
     * @return StepContext Context for this
     *                                                            StepInstance
     */
    protected function proxy() {
        if (!$this->context) {
            $this->context = new StepContext(
                $this->version,
                $this->solution['flowSid'],
                $this->solution['engagementSid'],
                $this->solution['sid']
            );
        }

        return $this->context;
    }

    /**
     * Magic getter to access properties
     *
     * @param string $name Property to access
     * @return mixed The requested property
     * @throws TwilioException For unknown properties
     */
    public function __get($name) {
        if (array_key_exists($name, $this->properties)) {
            return $this->properties[$name];
        }

        if (property_exists($this, '_' . $name)) {
            $method = 'get' . ucfirst($name);
            return $this->$method();
        }

        throw new TwilioException('Unknown property: ' . $name);
    }

    /**
     * Provide a friendly representation
     *
     * @return string Machine friendly representation
     */
    public function __toString() {
        $context = array();
        foreach ($this->solution as $key => $value) {
            $context[] = "$key=$value";
        }
        return '[Twilio.Studio.V1.StepInstance ' . implode(' ', $context) . ']';
    }

    /**
     * Access the stepContext
     *
     * @return StepContextList
     */
    protected function getStepContext() {
        return $this->proxy()->stepContext;
    }
}