<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Server;

use Brain\Monkey\Functions;
use LIT\MCP\Server\RequestContext;
use LIT\MCP\Tests\Unit\TestCase;
use stdClass;
use WP_REST_Request;
use WPMedia\MCP\OAuth\Auth\JWT;

final class RequestContextTest extends TestCase
{
    private const ROUTE = '/mcp/mcp-oauth-server';

    protected function tearDown(): void
    {
        RequestContext::reset();
        parent::tearDown();
    }

    public function testIsOAuthServerRequestIsFalseByDefault(): void
    {
        self::assertFalse(RequestContext::isOAuthServerRequest());
    }

    public function testRecordRouteMarksTheOAuthServerRoute(): void
    {
        RequestContext::recordRoute(null, [], new WP_REST_Request(self::ROUTE));

        self::assertTrue(RequestContext::isOAuthServerRequest());
    }

    public function testRecordRouteIgnoresOtherRoutes(): void
    {
        RequestContext::recordRoute(null, [], new WP_REST_Request('/wp/v2/users/me'));

        self::assertFalse(RequestContext::isOAuthServerRequest());
    }

    public function testRecordRouteReturnsResponseUnchanged(): void
    {
        $response = new stdClass();

        self::assertSame($response, RequestContext::recordRoute($response, [], new WP_REST_Request(self::ROUTE)));
    }

    public function testClearRouteResetsTheFlagAfterOurRequest(): void
    {
        $request = new WP_REST_Request(self::ROUTE);
        RequestContext::recordRoute(null, [], $request);
        $response = new stdClass();

        $result = RequestContext::clearRoute($response, [], $request);

        self::assertSame($response, $result);
        self::assertFalse(RequestContext::isOAuthServerRequest());
    }

    public function testClearRouteIgnoresNestedRequestsToOtherRoutes(): void
    {
        RequestContext::recordRoute(null, [], new WP_REST_Request(self::ROUTE));

        RequestContext::clearRoute(null, [], new WP_REST_Request('/wp/v2/posts'));

        self::assertTrue(RequestContext::isOAuthServerRequest());
    }

    public function testClientNameFallsBackToTheClientIdClaim(): void
    {
        Functions\when('get_option')->justReturn('test-secret');
        $token = JWT::encode([
            'sub' => '3',
            'app_pass_id' => 'uuid-unknown',
            'client_id' => 'https://claude.ai/oauth/mcp-oauth-client-metadata',
            'exp' => time() + 60,
        ], 'test-secret');

        RequestContext::recordRoute(
            null,
            [],
            new WP_REST_Request(self::ROUTE, ['authorization' => 'Bearer ' . $token])
        );

        self::assertSame('https://claude.ai/oauth/mcp-oauth-client-metadata', RequestContext::clientName());
    }

    public function testClientNameIsEmptyForAnInvalidToken(): void
    {
        Functions\when('get_option')->justReturn('test-secret');

        RequestContext::recordRoute(null, [], new WP_REST_Request(self::ROUTE, ['authorization' => 'Bearer garbage']));

        self::assertSame('', RequestContext::clientName());
    }

    public function testResetCanForceAClientName(): void
    {
        RequestContext::reset(true, 'Claude');

        self::assertTrue(RequestContext::isOAuthServerRequest());
        self::assertSame('Claude', RequestContext::clientName());
    }

    public function testRegisterHooksBeforeAndAfterCallbacks(): void
    {
        Functions\expect('add_filter')
            ->once()
            ->with('rest_request_before_callbacks', [RequestContext::class, 'recordRoute'], 10, 3);
        Functions\expect('add_filter')
            ->once()
            ->with('rest_request_after_callbacks', [RequestContext::class, 'clearRoute'], 10, 3);

        (new RequestContext())->register();
    }
}