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<?php
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namespace IMSGlobal\LTI\ToolProvider;
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/**
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 * Class to represent a content-item object
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 *
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 * @author  Stephen P Vickers <svickers@imsglobal.org>
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 * @copyright  IMS Global Learning Consortium Inc
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 * @date  2016
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 * @version 3.0.2
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 * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
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 */
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#[\AllowDynamicProperties]
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class ContentItem
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{
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/**
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 * Media type for LTI launch links.
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 */
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    const LTI_LINK_MEDIA_TYPE = 'application/vnd.ims.lti.v1.ltilink';
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/**
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 * Class constructor.
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 *
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 * @param string $type Class type of content-item
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 * @param ContentItemPlacement $placementAdvice  Placement object for item (optional)
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 * @param string $id   URL of content-item (optional)
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 */
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    function __construct($type, $placementAdvice = null, $id = null)
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    {
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        $this->{'@type'} = $type;
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        if (is_object($placementAdvice) && (count(get_object_vars($placementAdvice)) > 0)) {
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            $this->placementAdvice = $placementAdvice;
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        }
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        if (!empty($id)) {
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            $this->{'@id'} = $id;
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        }
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    }
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/**
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 * Set a URL value for the content-item.
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 *
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 * @param string $url  URL value
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 */
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    public function setUrl($url)
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    {
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        if (!empty($url)) {
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            $this->url = $url;
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        } else {
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            unset($this->url);
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        }
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    }
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/**
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 * Set a media type value for the content-item.
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 *
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 * @param string $mediaType  Media type value
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 */
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    public function setMediaType($mediaType)
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    {
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        if (!empty($mediaType)) {
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            $this->mediaType = $mediaType;
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        } else {
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            unset($this->mediaType);
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        }
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    }
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/**
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 * Set a title value for the content-item.
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 *
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 * @param string $title  Title value
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 */
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    public function setTitle($title)
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    {
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        if (!empty($title)) {
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            $this->title = $title;
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        } else if (isset($this->title)) {
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            unset($this->title);
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        }
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    }
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/**
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 * Set a link text value for the content-item.
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 *
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 * @param string $text  Link text value
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 */
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    public function setText($text)
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    {
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        if (!empty($text)) {
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            $this->text = $text;
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        } else if (isset($this->text)) {
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            unset($this->text);
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        }
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    }
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/**
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 * Wrap the content items to form a complete application/vnd.ims.lti.v1.contentitems+json media type instance.
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 *
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 * @param mixed $items An array of content items or a single item
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 * @return string
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 */
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    public static function toJson($items)
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    {
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/*
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        $data = array();
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        if (!is_array($items)) {
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            $data[] = json_encode($items);
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        } else {
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            foreach ($items as $item) {
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                $data[] = json_encode($item);
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            }
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        }
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        $json = '{ "@context" : "http://purl.imsglobal.org/ctx/lti/v1/ContentItem", "@graph" : [' . implode(", ", $data) . '] }';
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*/
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        $obj = new \stdClass();
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        $obj->{'@context'} = 'http://purl.imsglobal.org/ctx/lti/v1/ContentItem';
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        if (!is_array($items)) {
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          $obj->{'@graph'} = array();
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          $obj->{'@graph'}[] = $items;
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        } else {
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          $obj->{'@graph'} = $items;
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        }
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        return json_encode($obj);
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    }
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}