<?php

declare(strict_types=1);

namespace Facile\OpenIDClient\Service;

use function array_diff_key;
use function array_flip;
use function array_intersect_key;
use function array_key_exists;
use function array_merge;
use function Facile\OpenIDClient\check_server_response;
use Facile\OpenIDClient\Exception\InvalidArgumentException;
use Facile\OpenIDClient\Exception\RuntimeException;
use Facile\OpenIDClient\Issuer\IssuerInterface;
use function Facile\OpenIDClient\parse_metadata_response;
use function json_encode;
use JsonException;
use Psr\Http\Client\ClientExceptionInterface;
use Psr\Http\Client\ClientInterface;
use Psr\Http\Message\RequestFactoryInterface;

/**
 * Dynamic Client Registration Protocol
 *
 * @link https://tools.ietf.org/html/rfc7591
 * @link https://openid.net/specs/openid-connect-registration-1_0.html
 */
final class RegistrationService
{
    /** @var ClientInterface */
    private $client;

    /** @var RequestFactoryInterface */
    private $requestFactory;

    /** @var string[] */
    private static $registrationClaims = [
        'registration_access_token',
        'registration_client_uri',
        'client_secret_expires_at',
        'client_id_issued_at',
    ];

    public function __construct(
        ClientInterface $client,
        RequestFactoryInterface $requestFactory
    ) {
        $this->client = $client;
        $this->requestFactory = $requestFactory;
    }

    /**
     * @param array<string, mixed> $metadata
     *
     * @return array<string, mixed>
     */
    public function register(
        IssuerInterface $issuer,
        array $metadata,
        ?string $initialToken = null
    ): array {
        $registrationEndpoint = $issuer->getMetadata()->getRegistrationEndpoint();

        if (null === $registrationEndpoint) {
            throw new InvalidArgumentException('Issuer does not support dynamic client registration');
        }

        try {
            $encodedMetadata = json_encode($metadata, JSON_THROW_ON_ERROR);
        } catch (JsonException $e) {
            throw new RuntimeException('Unable to encode client metadata', 0, $e);
        }

        $request = $this->requestFactory->createRequest('POST', $registrationEndpoint)
            ->withHeader('content-type', 'application/json')
            ->withHeader('accept', 'application/json');

        $request->getBody()->write($encodedMetadata);

        if (null !== $initialToken) {
            $request = $request->withHeader('authorization', 'Bearer ' . $initialToken);
        }

        try {
            $response = $this->client->sendRequest($request);
        } catch (ClientExceptionInterface $e) {
            throw new RuntimeException('Unable to register OpenID client', 0, $e);
        }

        $data = parse_metadata_response($response, 201);

        if (! array_key_exists('client_id', $data)) {
            throw new RuntimeException('Registration response did not return a client_id field');
        }

        return $data;
    }

    /**
     * @return array<string, mixed>
     */
    public function read(string $clientUri, string $accessToken): array
    {
        $request = $this->requestFactory->createRequest('GET', $clientUri)
            ->withHeader('accept', 'application/json')
            ->withHeader('authorization', 'Bearer ' . $accessToken);

        try {
            $response = $this->client->sendRequest($request);
        } catch (ClientExceptionInterface $e) {
            throw new RuntimeException('Unable to read OpenID client', 0, $e);
        }

        $claims = parse_metadata_response($response, 200);

        if (! array_key_exists('client_id', $claims)) {
            throw new RuntimeException('Registration response did not return a client_id field');
        }

        return $claims;
    }

    /**
     * @param array<string, mixed> $metadata
     *
     * @return array<string, mixed>
     */
    public function update(
        string $clientUri,
        string $accessToken,
        array $metadata
    ): array {
        $clientRegistrationMetadata = array_intersect_key($metadata, array_flip(self::$registrationClaims));
        $metadata = array_diff_key($metadata, $clientRegistrationMetadata);

        try {
            $encodedMetadata = json_encode($metadata, JSON_THROW_ON_ERROR);
        } catch (JsonException $e) {
            throw new RuntimeException('Unable to encode client metadata', 0, $e);
        }

        $request = $this->requestFactory->createRequest('PUT', $clientUri)
            ->withHeader('accept', 'application/json')
            ->withHeader('content-type', 'application/json')
            ->withHeader('authorization', 'Bearer ' . $accessToken);

        $request->getBody()->write($encodedMetadata);

        try {
            $response = $this->client->sendRequest($request);
        } catch (ClientExceptionInterface $e) {
            throw new RuntimeException('Unable to update OpenID client', 0, $e);
        }

        $data = parse_metadata_response($response, 200);

        if (! array_key_exists('client_id', $data)) {
            throw new RuntimeException('Registration response did not return a client_id field');
        }

        /** @var array<string, mixed> $merged */
        $merged = array_merge($clientRegistrationMetadata, $data);

        return $merged;
    }

    public function delete(string $clientUri, string $accessToken): void
    {
        $request = $this->requestFactory->createRequest('DELETE', $clientUri)
            ->withHeader('authorization', 'Bearer ' . $accessToken);

        try {
            $response = $this->client->sendRequest($request);
        } catch (ClientExceptionInterface $e) {
            throw new RuntimeException('Unable to delete OpenID client', 0, $e);
        }

        check_server_response($response, 204);
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MjU3NjA4MzA2NDEwNjU4OSAxNzA5NjEzNDk0MjE3NzYyIDgyMjA2OTYyMjE2MjEyNjU=