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<?php
namespace PrettusRepositoryPresenter;

use Exception;
use IlluminateDatabaseEloquentCollection as EloquentCollection;
use IlluminatePaginationAbstractPaginator;
use IlluminatePaginationLengthAwarePaginator;
use IlluminatePaginationPaginator;
use LeagueFractalManager;
use LeagueFractalPaginationIlluminatePaginatorAdapter;
use LeagueFractalResourceCollection;
use LeagueFractalResourceItem;
use LeagueFractalSerializerSerializerAbstract;
use PrettusRepositoryContractsPresenterInterface;

/**
 * Class FractalPresenter
 * @package PrettusRepositoryPresenter
 */
abstract class FractalPresenter implements PresenterInterface
{
    /**
     * @var string
     */
    protected $resourceKeyItem = null;

    /**
     * @var string
     */
    protected $resourceKeyCollection = null;

    /**
     * @var LeagueFractalManager
     */
    protected $fractal = null;

    /**
     * @var LeagueFractalResourceCollection
     */
    protected $resource = null;

    /**
     * @throws Exception
     */
    public function __construct()
    {
        if (!class_exists('LeagueFractalManager')) {
            throw new Exception(trans('repository::packages.league_fractal_required'));
        }

        $this->fractal = new Manager();
        $this->parseIncludes();
        $this->setupSerializer();
    }

    /**
     * @return $this
     */
    protected function setupSerializer()
    {
        $serializer = $this->serializer();

        if ($serializer instanceof SerializerAbstract) {
            $this->fractal->setSerializer(new $serializer());
        }

        return $this;
    }

    /**
     * @return $this
     */
    protected function parseIncludes()
    {

        $request = app('IlluminateHttpRequest');
        $paramIncludes = config('repository.fractal.params.include', 'include');

        if ($request->has($paramIncludes)) {
            $this->fractal->parseIncludes($request->get($paramIncludes));
        }

        return $this;
    }

    /**
     * Get Serializer
     *
     * @return SerializerAbstract
     */
    public function serializer()
    {
        $serializer = config('repository.fractal.serializer', 'League\Fractal\Serializer\DataArraySerializer');

        return new $serializer();
    }

    /**
     * Transformer
     *
     * @return LeagueFractalTransformerAbstract
     */
    abstract public function getTransformer();

    /**
     * Prepare data to present
     *
     * @param $data
     *
     * @return mixed
     * @throws Exception
     */
    public function present($data)
    {
        if (!class_exists('LeagueFractalManager')) {
            throw new Exception(trans('repository::packages.league_fractal_required'));
        }

        if ($data instanceof EloquentCollection) {
            $this->resource = $this->transformCollection($data);
        } elseif ($data instanceof AbstractPaginator) {
            $this->resource = $this->transformPaginator($data);
        } else {
            $this->resource = $this->transformItem($data);
        }

        return $this->fractal->createData($this->resource)->toArray();
    }

    /**
     * @param $data
     *
     * @return Item
     */
    protected function transformItem($data)
    {
        return new Item($data, $this->getTransformer(), $this->resourceKeyItem);
    }

    /**
     * @param $data
     *
     * @return LeagueFractalResourceCollection
     */
    protected function transformCollection($data)
    {
        return new Collection($data, $this->getTransformer(), $this->resourceKeyCollection);
    }

    /**
     * @param AbstractPaginator|LengthAwarePaginator|Paginator $paginator
     *
     * @return LeagueFractalResourceCollection
     */
    protected function transformPaginator($paginator)
    {
        $collection = $paginator->getCollection();
        $resource = new Collection($collection, $this->getTransformer(), $this->resourceKeyCollection);
        $resource->setPaginator(new IlluminatePaginatorAdapter($paginator));

        return $resource;
    }
}