Integrations

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// src/Pagination/GitHubPullRequestAdapter.php
namespace App\Pagination;

use App\Api\GitHub\GitHubPullRequestConnection;
use Symfony\UX\Pagination\Adapter\CursorAdapterInterface;
use Symfony\UX\Pagination\Cursor\CursorBoundary;
use Symfony\UX\Pagination\Cursor\CursorOrder;
use Symfony\UX\Pagination\Cursor\CursorSlice;
use Symfony\UX\Pagination\Exception\InvalidArgumentException;

final class GitHubPullRequestAdapter implements CursorAdapterInterface
{
    public function supports(mixed $source): bool
    {
        return $source instanceof GitHubPullRequestConnection;
    }

    public function resolveCursorOrder(
        mixed $source,
        ?array $fields,
        ?string $direction,
    ): CursorOrder {
        \assert($source instanceof GitHubPullRequestConnection);

        if (null !== $fields || null !== $direction) {
            throw new InvalidArgumentException(
                'GitHub owns this connection order; omit orderBy().',
            );
        }

        return CursorOrder::byIdentity(
            'github:pullRequests:CREATED_AT:DESC:v1',
        );
    }

    public function getCursorContext(
        mixed $source,
        ?string $context,
    ): string {
        \assert($source instanceof GitHubPullRequestConnection);

        return json_encode([
            'endpoint' => 'https://api.github.com/graphql',
            'owner' => $source->getOwner(),
            'repository' => $source->getRepository(),
            'connection' => 'pullRequests',
            'context' => $context,
        ], \JSON_THROW_ON_ERROR);
    }

    public function sliceWithCursor(
        mixed $source,
        ?CursorBoundary $boundary,
        int $limit,
        CursorOrder $order,
    ): CursorSlice {
        \assert($source instanceof GitHubPullRequestConnection);
        if ($limit > 100) {
            throw new InvalidArgumentException(
                'GitHub accepts at most 100 pull requests per page.',
            );
        }

        $cursor = $this->getBoundaryCursor($boundary);
        $forward = $boundary?->pointsForward() ?? true;
        $connection = $source->fetch(
            first: $forward ? $limit : null,
            last: $forward ? null : $limit,
            after: $forward ? $cursor : null,
            before: $forward ? null : $cursor,
        );

        return $this->toCursorSlice($connection);
    }

    private function getBoundaryCursor(
        ?CursorBoundary $boundary,
    ): ?string {
        if (null === $boundary) {
            return null;
        }

        $values = $boundary->getValues();
        if (1 !== \count($values)
            || !\is_string($values[0])
            || '' === $values[0]
        ) {
            throw new InvalidArgumentException(
                'Expected one non-empty GitHub cursor.',
            );
        }

        return $values[0];
    }

    /**
     * @param array{
     *     nodes: list<array{number: int, title: string}>,
     *     pageInfo: array{
     *         startCursor: string|null,
     *         endCursor: string|null,
     *         hasPreviousPage: bool,
     *         hasNextPage: bool
     *     }
     * } $connection
     */
    private function toCursorSlice(array $connection): CursorSlice
    {
        $pageInfo = $connection['pageInfo'];
        if ($pageInfo['hasNextPage']
            && null === $pageInfo['endCursor']
        ) {
            throw new \UnexpectedValueException(
                'GitHub omitted endCursor.',
            );
        }
        if ($pageInfo['hasPreviousPage']
            && null === $pageInfo['startCursor']
        ) {
            throw new \UnexpectedValueException(
                'GitHub omitted startCursor.',
            );
        }

        return new CursorSlice(
            items: $connection['nodes'],
            next: $pageInfo['hasNextPage']
                ? new CursorBoundary([$pageInfo['endCursor']])
                : null,
            previous: $pageInfo['hasPreviousPage']
                ? new CursorBoundary(
                    [$pageInfo['startCursor']],
                    forward: false,
                )
                : null,
            hasNext: $pageInfo['hasNextPage'],
        );
    }
}