Data.php

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<?php
namespace Magento\Reports\Helper;

use Magento\Framework\Data\Collection;
use Magento\Framework\Stdlib\DateTime;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    const REPORT_PERIOD_TYPE_DAY = 'day';

    const REPORT_PERIOD_TYPE_MONTH = 'month';

    const REPORT_PERIOD_TYPE_YEAR = 'year';

    protected $_itemFactory;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Reports\Model\ItemFactory $itemFactory
    ) {
        parent::__construct($context);
        $this->_itemFactory = $itemFactory;
    }

    public function getIntervals($from, $to, $period = self::REPORT_PERIOD_TYPE_DAY)
    {
        $intervals = [];
        if (!$from && !$to) {
            return $intervals;
        }

        $dateStart = new \DateTime($from);
        $dateEnd = new \DateTime($to);
        while ($dateStart->diff($dateEnd)->invert == 0) {
            switch ($period) {
                case self::REPORT_PERIOD_TYPE_DAY:
                    $intervals[] = $dateStart->format('Y-m-d');
                    $dateStart->add(new \DateInterval('P1D'));
                    break;
                case self::REPORT_PERIOD_TYPE_MONTH:
                    $intervals[] = $dateStart->format('Y-m');
                    $dateStart->add(new \DateInterval('P1M'));
                    break;
                case self::REPORT_PERIOD_TYPE_YEAR:
                    $intervals[] = $dateStart->format('Y');
                    $dateStart->add(new \DateInterval('P1Y'));
                    break;
            }
        }
        return $intervals;
    }

    public function prepareIntervalsCollection($collection, $from, $to, $periodType = self::REPORT_PERIOD_TYPE_DAY)
    {
        $intervals = $this->getIntervals($from, $to, $periodType);

        foreach ($intervals as $interval) {
            $item = $this->_itemFactory->create();
            $item->setPeriod($interval);
            $item->setIsEmpty();
            $collection->addItem($item);
        }
    }
}