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<?php

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namespace WPML\Utils;

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use WPML\Collect\Support\Collection;

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class Pager {

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/** @var string */

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protected $optionName;

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/** @var int */

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protected $pageSize;

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/**

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* @param string $optionName

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* @param int $pageSize

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public function __construct( $optionName, $pageSize = 10 ) {

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$this->optionName = $optionName;

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$this->pageSize = $pageSize;

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}

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/**

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* @param Collection $collection

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* @param callable $callback

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* @param int $timeout

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* @return int

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public function iterate( Collection $collection, callable $callback, $timeout = PHP_INT_MAX ) {

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$processedItems = $this->getProcessedCount();

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$this->getItemsToProcess( $collection, $processedItems )->eachWithTimeout( function ( $item ) use (

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&$processedItems,

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$callback

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) {

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return $callback( $item ) && ++ $processedItems;

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}, $timeout );

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$remainingPages = $this->getRemainingPages( $collection, $processedItems );

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if ( $remainingPages ) {

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\update_option( $this->optionName, $processedItems );

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} else {

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\delete_option( $this->optionName );

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}

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return $remainingPages;

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}

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private function getItemsToProcess( Collection $collection, $processedItems ) {

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return $collection->slice( $processedItems, $this->pageSize );

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}

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/**

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* @param Collection $collection

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* @return int

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public function getPagesCount( Collection $collection ) {

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return (int) ceil( $collection->count() / $this->pageSize );

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}

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/**

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* @param \WPML\Collect\Support\Collection $collection

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* @return int

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protected function getRemainingPages( Collection $collection, $processedItems ) {

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return (int) ceil( $collection->slice( $processedItems )->count() / $this->pageSize );

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}

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/**

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* @return int

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public function getProcessedCount() {

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return get_option( $this->optionName, 0 );

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}

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}

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