<?php

namespace Facile\OpenIDClient\Service;

use Facile\OpenIDClient\Exception\InvalidArgumentException;
use Facile\OpenIDClient\Exception\RuntimeException;
use Facile\OpenIDClient\Issuer\IssuerInterface;
use JsonException;
use Psr\Http\Client\ClientExceptionInterface;
use Psr\Http\Client\ClientInterface;
use Psr\Http\Message\RequestFactoryInterface;

use function Facile\OpenIDClient\check_server_response;
use function Facile\OpenIDClient\parse_metadata_response;
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 json_encode;

/**
 * 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:----ODM1NDU5MzQ3Njk1Nzc4MCAzMzE2ODQ2MzgyMjEyMTc3IDY2NjEyNTU1MzQ0NDg5ODI=