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<?php
/**
 * @license http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 * @author Hervé Guétin <[email protected]> <@herveguetin>
 * @copyright Copyright (c) 2016 Agence Soon (http://www.agence-soon.fr)
 */

namespace Soon\Faq\Ui\Component\Listing\DataProviders;


use Magento\Framework\App\Request\DataPersistorInterface;
use Magento\Framework\Model\AbstractModel;
use Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection;
use Magento\Ui\DataProvider\AbstractDataProvider;

class Form extends AbstractDataProvider
{
    /**
     * @var AbstractCollection
     */
    protected $collection;

    /**
     * @var DataPersistorInterface
     */
    protected $dataPersistor;

    /**
     * @var array
     */
    protected $loadedData;
    /**
     * @var string
     */
    protected $dataPersistorKey;

    /**
     * Constructor
     *
     * @param string $name
     * @param string $primaryFieldName
     * @param string $requestFieldName
     * @param DataPersistorInterface $dataPersistor
     * @param array $meta
     * @param array $data
     */
    public function __construct(
        $name,
        $primaryFieldName,
        $requestFieldName,
        DataPersistorInterface $dataPersistor,
        array $meta = [],
        array $data = []
    )
    {
        $this->dataPersistor = $dataPersistor;
        parent::__construct($name, $primaryFieldName, $requestFieldName, $meta, $data);
    }

    /**
     * Get data
     *
     * @return array
     */
    public function getData()
    {
        if (isset($this->loadedData)) {
            return $this->loadedData;
        }

        $this->populateLoadedData();

        return $this->loadedData;
    }

    /**
     * Actual logic to populate loadedData
     */
    private function populateLoadedData()
    {
        $items = $this->collection->getItems();
        /** @var AbstractModel $item */
        foreach ($items as $item) {
            $this->loadedData[$item->getId()] = $item->getData();
        }

        $this->populateLoadedDataFromPersistor();
    }

    /**
     * Data may exist from DataPersistor...
     */
    private function populateLoadedDataFromPersistor()
    {
        $data = $this->dataPersistor->get($this->dataPersistorKey);
        if (!empty($data)) {
            $this->populateLoadedDataFromExistingData($data);
        }
    }

    /**
     * @param array $data
     */
    private function populateLoadedDataFromExistingData($data)
    {
        /** @var AbstractModel $item */
        $item = $this->collection->getNewEmptyItem();
        $item->setData($data);
        $this->loadedData[$item->getId()] = $item->getData();
        $this->dataPersistor->clear($this->dataPersistorKey);
    }

}