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Copyright (C) Villanova University 2010
Copyright (C) The National Library of Finland 2023

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2,
as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:17:" * fileDescriptor";N;s:7:" * line";i:0;s:7:" * tags";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:5:{s:8:"category";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:8:"category";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:6:"VuFind";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"package";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"package";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:18:"Controller_Plugins";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:6:"author";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:2:{i:0;O:45:"phpDocumentor\Descriptor\Tag\AuthorDescriptor":3:{s:7:" * name";s:6:"author";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:39:"Demian Katz <demian.katz@villanova.edu>";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}i:1;O:45:"phpDocumentor\Descriptor\Tag\AuthorDescriptor":3:{s:7:" * name";s:6:"author";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:37:"Ere Maijala <ere.maijala@helsinki.fi>";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"license";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"license";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:69:"http://opensource.org/licenses/gpl-2.0.php GNU General Public License";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:4:"link";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:43:"phpDocumentor\Descriptor\Tag\LinkDescriptor":4:{s:7:" * name";s:4:"link";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:4:"Wiki";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:7:" * link";s:35:"https://vufind.org/wiki/development";}}}}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:19:" * inheritedElement";N;s:7:" * hash";s:32:"87fdf9e1727c8a2bf934aea5f543ab93";s:7:" * path";s:54:"VuFind/src/VuFind/Controller/Plugin/ResultScroller.php";s:9:" * source";s:23863:"<?php

/**
 * Class for managing "next" and "previous" navigation within result sets.
 *
 * PHP version 8
 *
 * Copyright (C) Villanova University 2010
 * Copyright (C) The National Library of Finland 2023
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category VuFind
 * @package  Controller_Plugins
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @author   Ere Maijala <ere.maijala@helsinki.fi>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org/wiki/development Wiki
 */

namespace VuFind\Controller\Plugin;

use Exception;
use Laminas\Mvc\Controller\Plugin\AbstractPlugin;
use Laminas\Session\Container as SessionContainer;
use VuFind\Db\Service\SearchServiceInterface;
use VuFind\RecordDriver\AbstractBase as BaseRecord;
use VuFind\Search\Base\Results;
use VuFind\Search\Memory as SearchMemory;
use VuFind\Search\Results\PluginManager as ResultsManager;

use function count;
use function is_array;

/**
 * Class for managing "next" and "previous" navigation within result sets.
 *
 * @category VuFind
 * @package  Controller_Plugins
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @author   Ere Maijala <ere.maijala@helsinki.fi>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org/wiki/development Wiki
 */
class ResultScroller extends AbstractPlugin
{
    /**
     * Maximum number of last searches to track
     *
     * @var int
     */
    public const LAST_SEARCH_LIMIT = 10;

    /**
     * Is scroller enabled?
     *
     * @var bool
     */
    protected $enabled;

    /**
     * Session data used by scroller
     *
     * @var SessionContainer
     */
    protected $session;

    /**
     * Results manager
     *
     * @var ResultsManager
     */
    protected $resultsManager;

    /**
     * Search memory
     *
     * @var SearchMemory
     */
    protected $searchMemory;

    /**
     * Currently active scroll data
     *
     * @var \stdClass
     */
    protected $data = null;

    /**
     * Constructor. Create a new search result scroller.
     *
     * @param SessionContainer $session Session container
     * @param ResultsManager   $rm      Results manager
     * @param SearchMemory     $sm      Search memory
     * @param bool             $enabled Is the scroller enabled?
     */
    public function __construct(
        SessionContainer $session,
        ResultsManager $rm,
        SearchMemory $sm,
        $enabled = true
    ) {
        $this->enabled = $enabled;
        $this->session = $session;
        $this->resultsManager = $rm;
        $this->searchMemory = $sm;
    }

    /**
     * Initialize this result set scroller. This should only be called
     * prior to displaying the results of a new search.
     *
     * @param Results $searchObject The search object that was used to execute the
     * last search.
     *
     * @return bool True if enabled and initialized with results, false otherwise.
     */
    public function init($searchObject)
    {
        // Do nothing if disabled or search is empty:
        if (!$this->enabled || $searchObject->getResultTotal() <= 0) {
            return false;
        }

        // Save the details of this search in the session:
        $this->addData($searchObject);
        return (bool)$this->session->s[$searchObject->getSearchId()]->currIds;
    }

    /**
     * Add data to session for a search
     *
     * @param Results $searchObject Search object
     *
     * @return void
     */
    protected function addData(Results $searchObject): void
    {
        $data = new \stdClass();
        $data->page = $searchObject->getParams()->getPage();
        $data->limit = $searchObject->getParams()->getLimit();
        $data->sort = $searchObject->getParams()->getSort();
        $data->total = $searchObject->getResultTotal();
        $data->firstlast = $searchObject->getOptions()->recordFirstLastNavigationEnabled();

        // save the IDs of records on the current page to the session
        // so we can "slide" from one record to the next/previous records
        // spanning 2 consecutive pages
        $data->currIds = $this->fetchPage($searchObject);

        // Store last access time for eviction
        $data->lastAccessTime = time();

        if (!isset($this->session->s)) {
            $this->session->s = [];
        }

        $this->ensureRoomInSessionStorage();
        $this->session->s[$searchObject->getSearchId()] = $data;
    }

    /**
     * Make room for a new entry in the session storage as necessary
     *
     * @return void
     */
    protected function ensureRoomInSessionStorage(): void
    {
        // Evict oldest entry if storage is full:
        while (count($this->session->s) >= static::LAST_SEARCH_LIMIT) {
            $oldest = null;
            $oldestTime = null;
            foreach ($this->session->s as $id => $search) {
                if (null === $oldest || $search->lastAccessTime < $oldestTime) {
                    $oldest = $id;
                    $oldestTime = $search->lastAccessTime;
                }
            }
            unset($this->session->s[$oldest]);
        }
    }

    /**
     * Return a modified results array to help scroll the user through the current
     * page of results
     *
     * @param array $retVal Return values (in progress)
     * @param int   $pos    Current position within current page
     *
     * @return array
     */
    protected function scrollOnCurrentPage($retVal, $pos)
    {
        $retVal['previousRecord'] = $this->data->currIds[$pos - 1];
        $retVal['nextRecord'] = $this->data->currIds[$pos + 1];
        // and we're done
        return $retVal;
    }

    /**
     * Return a modified results array for the case where the user is on the cusp of
     * the previous page of results
     *
     * @param array   $retVal     Return values (in progress)
     * @param Results $lastSearch Representation of last search
     * @param int     $pos        Current position within current
     * page
     * @param int     $count      Size of current page of results
     *
     * @return array
     */
    protected function fetchPreviousPage($retVal, $lastSearch, $pos, $count)
    {
        // if the current page is NOT the first page, and
        // the previous page has not been fetched before, then
        // fetch the previous page
        if ($this->data->page > 1 && $this->data->prevIds == null) {
            $this->data->prevIds = $this->fetchPage(
                $lastSearch,
                $this->data->page - 1
            );
        }

        // if there is something on the previous page, then the previous
        // record is the last record on the previous page
        if (!empty($this->data->prevIds)) {
            $retVal['previousRecord']
                = $this->data->prevIds[count($this->data->prevIds) - 1];
        }

        // if it is not the last record on the current page, then
        // we also have a next record on the current page
        if ($pos < $count - 1) {
            $retVal['nextRecord'] = $this->data->currIds[$pos + 1];
        }

        // and we're done
        return $retVal;
    }

    /**
     * Return a modified results array for the case where the user is on the cusp of
     * the next page of results
     *
     * @param array   $retVal     Return values (in progress)
     * @param Results $lastSearch Representation of last search
     * @param int     $pos        Current position within current
     * page
     *
     * @return array
     */
    protected function fetchNextPage($retVal, $lastSearch, $pos)
    {
        // if the current page is NOT the last page, and the next page has not been
        // fetched, then fetch the next page
        if (
            $this->data->page < ceil($this->data->total / $this->data->limit)
            && $this->data->nextIds == null
        ) {
            $this->data->nextIds = $this->fetchPage(
                $lastSearch,
                $this->data->page + 1
            );
        }

        // if there is something on the next page, then the next
        // record is the first record on the next page
        if (is_array($this->data->nextIds) && count($this->data->nextIds) > 0) {
            $retVal['nextRecord'] = $this->data->nextIds[0];
        }

        // if it is not the first record on the current page, then
        // we also have a previous record on the current page
        if ($pos > 0) {
            $retVal['previousRecord'] = $this->data->currIds[$pos - 1];
        }

        // and we're done
        return $retVal;
    }

    /**
     * Return a modified results array for the case where we need to retrieve data
     * from the previous page of results
     *
     * @param array   $retVal     Return values (in progress)
     * @param Results $lastSearch Representation of last search
     * @param int     $pos        Current position within
     * previous page
     *
     * @return array
     */
    protected function scrollToPreviousPage($retVal, $lastSearch, $pos)
    {
        // decrease the page in the session because
        // we're now sliding into the previous page
        // (-- doesn't work on ArrayObjects)
        $this->data->page = $this->data->page - 1;

        // shift pages to the right
        $tmp = $this->data->currIds;
        $this->data->currIds = $this->data->prevIds;
        $this->data->nextIds = $tmp;
        $this->data->prevIds = null;

        // now we can set the previous/next record
        if ($pos > 0) {
            $retVal['previousRecord']
                = $this->data->currIds[$pos - 1];
        }
        $retVal['nextRecord'] = $this->data->nextIds[0];

        // recalculate the current position
        $retVal['currentPosition']
            = ($this->data->page - 1)
            * $this->data->limit + $pos + 1;

        // update the search URL in the session
        $lastSearch->getParams()->setPage($this->data->page);
        $this->rememberSearch($lastSearch);

        // and we're done
        return $retVal;
    }

    /**
     * Return a modified results array for the case where we need to retrieve data
     * from the next page of results
     *
     * @param array   $retVal     Return values (in progress)
     * @param Results $lastSearch Representation of last search
     * @param int     $pos        Current position within next
     * page
     *
     * @return array
     */
    protected function scrollToNextPage($retVal, $lastSearch, $pos)
    {
        // increase the page in the session because
        // we're now sliding into the next page
        // (++ doesn't work on ArrayObjects)
        $this->data->page = $this->data->page + 1;

        // shift pages to the left
        $tmp = $this->data->currIds;
        $this->data->currIds = $this->data->nextIds;
        $this->data->prevIds = $tmp;
        $this->data->nextIds = null;

        // now we can set the previous/next record
        $retVal['previousRecord']
            = $this->data->prevIds[count($this->data->prevIds) - 1];
        if ($pos < count($this->data->currIds) - 1) {
            $retVal['nextRecord'] = $this->data->currIds[$pos + 1];
        }

        // recalculate the current position
        $retVal['currentPosition']
            = ($this->data->page - 1)
            * $this->data->limit + $pos + 1;

        // update the search URL in the session
        $lastSearch->getParams()->setPage($this->data->page);
        $this->rememberSearch($lastSearch);

        // and we're done
        return $retVal;
    }

    /**
     * Return a modified results array for the case where we need to retrieve data
     * from the the first page of results
     *
     * @param array   $retVal     Return values (in progress)
     * @param Results $lastSearch Representation of last search
     *
     * @return array
     */
    protected function scrollToFirstRecord($retVal, $lastSearch)
    {
        // Set page in session to First Page
        $this->data->page = 1;
        // update the search URL in the session
        $lastSearch->getParams()->setPage($this->data->page);
        $this->rememberSearch($lastSearch);

        // update current, next and prev Ids
        $this->data->currIds = $this->fetchPage($lastSearch, $this->data->page);
        $this->data->nextIds = $this->fetchPage($lastSearch, $this->data->page + 1);
        $this->data->prevIds = null;

        // now we can set the previous/next record
        $retVal['previousRecord'] = null;
        $retVal['nextRecord'] = $this->data->currIds[1] ?? null;
        // cover extremely unlikely edge case -- page size of 1:
        if (null === $retVal['nextRecord'] && isset($this->data->nextIds[0])) {
            $retVal['nextRecord'] = $this->data->nextIds[0];
        }

        // recalculate the current position
        $retVal['currentPosition'] = 1;

        // and we're done
        return $retVal;
    }

    /**
     * Return a modified results array for the case where we need to retrieve data
     * from the the last page of results
     *
     * @param array   $retVal     Return values (in progress)
     * @param Results $lastSearch Representation of last search
     *
     * @return array
     */
    protected function scrollToLastRecord($retVal, $lastSearch)
    {
        // Set page in session to Last Page
        $this->data->page = $this->getLastPageNumber();
        // update the search URL in the session
        $lastSearch->getParams()->setPage($this->data->page);
        $this->rememberSearch($lastSearch);

        // update current, next and prev Ids
        $this->data->currIds = $this->fetchPage($lastSearch, $this->data->page);
        $this->data->prevIds = $this->fetchPage($lastSearch, $this->data->page - 1);
        $this->data->nextIds = null;

        // recalculate the current position
        $retVal['currentPosition'] = $this->data->total;

        // now we can set the previous/next record
        $retVal['nextRecord'] = null;
        if (count($this->data->currIds) > 1) {
            $pos = count($this->data->currIds) - 2;
            $retVal['previousRecord'] = $this->data->currIds[$pos];
        } elseif (count($this->data->prevIds) > 0) {
            $prevPos = count($this->data->prevIds) - 1;
            $retVal['previousRecord'] = $this->data->prevIds[$prevPos];
        }

        // and we're done
        return $retVal;
    }

    /**
     * Get the ID of the first record in the result set.
     *
     * @param Results $lastSearch Representation of last search
     *
     * @return string
     */
    protected function getFirstRecordId($lastSearch)
    {
        if (!isset($this->data->firstId)) {
            $firstPage = $this->fetchPage($lastSearch, 1);
            $this->data->firstId = $firstPage[0];
        }
        return $this->data->firstId;
    }

    /**
     * Calculate the last page number in the result set.
     *
     * @return int
     */
    protected function getLastPageNumber()
    {
        return ceil($this->data->total / $this->data->limit);
    }

    /**
     * Get the ID of the last record in the result set.
     *
     * @param Results $lastSearch Representation of last search
     *
     * @return string
     */
    protected function getLastRecordId($lastSearch)
    {
        if (!isset($this->data->lastId)) {
            $results = $this->fetchPage($lastSearch, $this->getLastPageNumber());
            $this->data->lastId = array_pop($results);
        }
        return $this->data->lastId;
    }

    /**
     * Get the previous/next record in the last search
     * result set relative to the current one, also return
     * the position of the current record in the result set.
     * Return array('previousRecord'=>previd, 'nextRecord'=>nextid,
     * 'currentPosition'=>number, 'resultTotal'=>number).
     *
     * @param BaseRecord $driver Driver for the record currently being displayed
     *
     * @return array
     */
    public function getScrollData($driver)
    {
        $retVal = [
            'firstRecord' => null, 'lastRecord' => null,
            'previousRecord' => null, 'nextRecord' => null,
            'currentPosition' => null, 'resultTotal' => null,
        ];

        $searchId = $this->searchMemory->getLastSearchId();
        // Process scroll data only if enabled and data exists:
        if (
            !$this->enabled || !$searchId || !isset($this->session->s[$searchId])
            || !($lastSearch = $this->restoreSearch($searchId))
        ) {
            return $retVal;
        }
        $this->data = $this->session->s[$searchId];
        // Get results:
        $result = $this->buildScrollDataArray($retVal, $driver, $lastSearch);
        // Touch and update session with any changes:
        $this->data->lastAccessTime = time();
        $this->session->s[$searchId] = $this->data;

        return $result;
    }

    /**
     * Build and return the scroll data array
     *
     * @param array      $retVal     Return values (in progress)
     * @param BaseRecord $driver     Driver for the record currently being displayed
     * @param Results    $lastSearch Representation of last search
     *
     * @return array
     */
    protected function buildScrollDataArray(
        array $retVal,
        BaseRecord $driver,
        Results $lastSearch
    ): array {
        // Make sure expected data elements are populated:
        if (!isset($this->data->prevIds)) {
            $this->data->prevIds = null;
        }
        if (!isset($this->data->nextIds)) {
            $this->data->nextIds = null;
        }

        // Store total result set size:
        $retVal['resultTotal'] = $this->data->total ?? 0;

        // Set first and last record IDs
        if ($this->data->firstlast) {
            $retVal['firstRecord'] = $this->getFirstRecordId($lastSearch);
            $retVal['lastRecord'] = $this->getLastRecordId($lastSearch);
        }

        // build a full ID string using the driver:
        $id = $driver->getSourceIdentifier() . '|' . $driver->getUniqueId();

        // find where this record is in the current result page
        $pos = is_array($this->data->currIds)
            ? array_search($id, $this->data->currIds)
            : false;
        if ($pos !== false) {
            // OK, found this record in the current result page
            // calculate its position relative to the result set
            $retVal['currentPosition']
                = ($this->data->page - 1) * $this->data->limit + $pos + 1;

            // count how many records in the current result page
            $count = count($this->data->currIds);
            if ($pos > 0 && $pos < $count - 1) {
                // the current record is somewhere in the middle of the current
                // page, ie: not first or last
                return $this->scrollOnCurrentPage($retVal, $pos);
            } elseif ($pos == 0) {
                // this record is first record on the current page
                return $this
                    ->fetchPreviousPage($retVal, $lastSearch, $pos, $count);
            } elseif ($pos == $count - 1) {
                // this record is last record on the current page
                return $this->fetchNextPage($retVal, $lastSearch, $pos);
            }
        } else {
            // the current record is not on the current page
            // if there is something on the previous page
            if (!empty($this->data->prevIds)) {
                // check if current record is on the previous page
                $pos = is_array($this->data->prevIds)
                    ? array_search($id, $this->data->prevIds) : false;
                if ($pos !== false) {
                    return $this
                        ->scrollToPreviousPage($retVal, $lastSearch, $pos);
                }
            }
            // if there is something on the next page
            if (!empty($this->data->nextIds)) {
                // check if current record is on the next page
                $pos = is_array($this->data->nextIds)
                    ? array_search($id, $this->data->nextIds) : false;
                if ($pos !== false) {
                    return $this->scrollToNextPage($retVal, $lastSearch, $pos);
                }
            }
            if ($this->data->firstlast) {
                if ($id == $retVal['firstRecord']) {
                    return $this->scrollToFirstRecord($retVal, $lastSearch);
                }
                if ($id == $retVal['lastRecord']) {
                    return $this->scrollToLastRecord($retVal, $lastSearch);
                }
            }
        }

        return $retVal;
    }

    /**
     * Fetch the given page of results from the given search object and
     * return the IDs of the records in an array.
     *
     * @param object $searchObject The search object to use to execute the search
     * @param int    $page         The page number to fetch (null for current)
     *
     * @return array
     */
    protected function fetchPage($searchObject, $page = null)
    {
        if (null !== $page) {
            $searchObject->getParams()->setPage($page);
            $searchObject->performAndProcessSearch();
        }

        $retVal = [];
        foreach ($searchObject->getResults() as $record) {
            if (!($record instanceof BaseRecord)) {
                return false;
            }
            $retVal[]
                = $record->getSourceIdentifier() . '|' . $record->getUniqueId();
        }
        return $retVal;
    }

    /**
     * Restore a saved search.
     *
     * @param int $searchId Search ID
     *
     * @return ?Results
     */
    protected function restoreSearch(int $searchId): ?Results
    {
        $searchService = $this->getController()->getDbService(SearchServiceInterface::class);
        $row = $searchService->getSearchByIdAndOwner(
            $searchId,
            $this->session->getManager()->getId(),
            null
        );
        if (!empty($row)) {
            $search = $row->getSearchObject()?->deminify($this->resultsManager);
            if (!$search) {
                throw new Exception("Problem getting search object from search {$row->getId()}.");
            }
            // The saved search does not remember its original limit or sort;
            // we should reapply them from the session data:
            $search->getParams()->setLimit(
                $this->session->s[$searchId]->limit ?? null
            );
            $search->getParams()->setSort(
                $this->session->s[$searchId]->sort ?? null
            );
            return $search;
        }
        return null;
    }

    /**
     * Update the remembered "last search" in the session.
     *
     * @param Results $search Search object to remember.
     *
     * @return void
     */
    protected function rememberSearch($search)
    {
        $baseUrl = $this->getController()->url()->fromRoute(
            $search->getOptions()->getSearchAction()
        );
        $this->searchMemory->rememberSearch(
            $baseUrl . $search->getUrlQuery()->getParams(false),
            $search->getSearchId()
        );
    }
}
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