LineItem.php

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<?php

namespace ILIAS\LTI\ToolProvider\Service;

use ILIAS\LTI\ToolProvider;
use ILIAS\LTI\ToolProvider\Platform;

class LineItem extends AssignmentGrade
{
    public const MEDIA_TYPE_LINE_ITEM = 'application/vnd.ims.lis.v2.lineitem+json';

    public const MEDIA_TYPE_LINE_ITEMS = 'application/vnd.ims.lis.v2.lineitemcontainer+json';

    public static string $SCOPE = 'https://purl.imsglobal.org/spec/lti-ags/scope/lineitem';

    public static string $SCOPE_READONLY = 'https://purl.imsglobal.org/spec/lti-ags/scope/lineitem.readonly';

    public static ?int $defaultLimit = null; //UK added ?int

    private ?int $limit;

    private bool $pagingMode;

    public function __construct(Platform $platform, string $endpoint, int $limit = null, bool $pagingMode = false)
    {
        parent::__construct($platform, $endpoint);
        $this->limit = $limit;
        $this->pagingMode = $pagingMode;
        $this->scope = self::$SCOPE;
    }

    public function getAll(string $ltiResourceLinkId = null, string $resourceId = null, string $tag = null, int $limit = null)
    {
        $params = array();
        if (!empty($ltiResourceLinkId)) {
            $params['resource_link_id'] = $ltiResourceLinkId;
        }
        if (!empty($resourceId)) {
            $params['resource_id'] = $resourceId;
        }
        if (!empty($tag)) {
            $params['tag'] = $tag;
        }
        if (is_null($limit)) {
            $limit = $this->limit;
        }
        if (is_null($limit)) {
            $limit = self::$defaultLimit;
        }
        if (!empty($limit)) {
            $params['limit'] = $limit;
        }
        $lineItems = array();
        $endpoint = $this->endpoint;
        do {
            $this->scope = self::$SCOPE_READONLY;
            $this->mediaType = self::MEDIA_TYPE_LINE_ITEMS;
            $http = $this->send('GET', $params);
            $this->scope = self::$SCOPE;
            $url = '';
            if ($http->ok) {
                if (!empty($http->responseJson)) {
                    foreach ($http->responseJson as $lineItem) {
                        $lineItems[] = self::toLineItem($this->getPlatform(), $lineItem);
                    }
                }
                if (!$this->pagingMode && $http->hasRelativeLink('next')) {
                    $url = $http->getRelativeLink('next');
                    $this->endpoint = $url;
                    $params = array();
                }
            } else {
                $lineItems = false;
            }
        } while ($url);
        $this->endpoint = $endpoint;

        return $lineItems;
    }

    public function createLineItem(ToolProvider\LineItem $lineItem): bool
    {
        $lineItem->endpoint = null;
        $this->mediaType = self::MEDIA_TYPE_LINE_ITEM;
        $http = $this->send('POST', null, self::toJson($lineItem));
        $ok = $http->ok && !empty($http->responseJson);
        if ($ok) {
            $newLineItem = self::toLineItem($this->getPlatform(), $http->responseJson);
            foreach (get_object_vars($newLineItem) as $key => $value) {
                $lineItem->$key = $value;
            }
        }

        return $ok;
    }

    public function saveLineItem(ToolProvider\LineItem $lineItem): bool
    {
        $this->mediaType = self::MEDIA_TYPE_LINE_ITEM;
        $http = $this->send('PUT', null, self::toJson($lineItem));
        $ok = $http->ok;
        if ($ok && !empty($http->responseJson)) {
            $savedLineItem = self::toLineItem($this->getPlatform(), $http->responseJson);
            foreach (get_object_vars($savedLineItem) as $key => $value) {
                $lineItem->$key = $value;
            }
        }

        return $ok;
    }

    public function deleteLineItem(ToolProvider\LineItem $lineItem): bool
    {
        $this->mediaType = self::MEDIA_TYPE_LINE_ITEM;
        $http = $this->send('DELETE');

        return $http->ok;
    }

    public static function getLineItem(Platform $platform, string $endpoint)
    {
        $service = new self($platform, $endpoint);
        $service->scope = self::$SCOPE_READONLY;
        $service->mediaType = self::MEDIA_TYPE_LINE_ITEM;
        $http = $service->send('GET');
        $service->scope = self::$SCOPE;
        if ($http->ok && !empty($http->responseJson)) {
            $lineItem = self::toLineItem($platform, $http->responseJson);
        } else {
            $lineItem = false;
        }

        return $lineItem;
    }

    ###
    ###  PRIVATE METHODS
    ###

    private static function toLineItem(Platform $platform, object $json): ?ToolProvider\LineItem
    {
        if (!empty($json->id) && !empty($json->label) && !empty($json->scoreMaximum)) {
//            $lineItem = new LTI\LineItem($platform, $json->label, $json->scoreMaximum);
            $lineItem = new \ILIAS\LTI\ToolProvider\LineItem($platform, $json->label, $json->scoreMaximum);
            if (!empty($json->id)) {
                $lineItem->endpoint = $json->id;
            }
            if (!empty($json->resourceLinkId)) {
                $lineItem->ltiResourceLinkId = $json->resourceLinkId;
            }
            if (!empty($json->resourceId)) {
                $lineItem->resourceId = $json->resourceId;
            }
            if (!empty($json->tag)) {
                $lineItem->tag = $json->tag;
            }
            if (!empty($json->startDateTime)) {
                $lineItem->submitFrom = strtotime($json->startDateTime);
            }
            if (!empty($json->endDateTime)) {
                $lineItem->submitUntil = strtotime($json->endDateTime);
            }
        } else {
            $lineItem = null;
        }

        return $lineItem;
    }

    private static function toJson(ToolProvider\LineItem $lineItem): string
    {
        $json = new \stdClass();
        if (!empty($lineItem->endpoint)) {
            $json->id = $lineItem->endpoint;
        }
        if (!empty($lineItem->label)) {
            $json->label = $lineItem->label;
        }
        if (!empty($lineItem->pointsPossible)) {
            $json->scoreMaximum = $lineItem->pointsPossible;
        }
        if (!empty($lineItem->ltiResourceLinkId)) {
            $json->resourceLinkId = $lineItem->ltiResourceLinkId;
        }
        if (!empty($lineItem->resourceId)) {
            $json->resourceId = $lineItem->resourceId;
        }
        if (!empty($lineItem->tag)) {
            $json->tag = $lineItem->tag;
        }
        if (!empty($lineItem->submitFrom)) {
            $json->startDateTime = date('Y-m-d\TH:i:sP', $lineItem->submitFrom);
        }
        if (!empty($lineItem->submitUntil)) {
            $json->endDateTime = date('Y-m-d\TH:i:sP', $lineItem->submitUntil);
        }

        return json_encode($json);
    }
}