<?php
declare(strict_types=1);

namespace Tests\Shared;

use App\Shared\Http\ClientIpResolver;
use PHPUnit\Framework\TestCase;
use Slim\Psr7\Factory\ServerRequestFactory;

#[\PHPUnit\Framework\Attributes\AllowMockObjectsWithoutExpectations]

final class ClientIpResolverTest extends TestCase
{
    public function testResolveReturnsDefaultWhenRemoteAddrMissing(): void
    {
        $request = (new ServerRequestFactory())->createServerRequest('GET', '/');
        $resolver = new ClientIpResolver();

        self::assertSame('0.0.0.0', $resolver->resolve($request));
    }

    public function testResolveReturnsRemoteAddrWhenProxyNotTrusted(): void
    {
        $request = (new ServerRequestFactory())->createServerRequest('GET', '/', [
            'REMOTE_ADDR' => '10.0.0.1',
            'HTTP_X_FORWARDED_FOR' => '203.0.113.10',
        ]);

        $resolver = new ClientIpResolver(['127.0.0.1']);

        self::assertSame('10.0.0.1', $resolver->resolve($request));
    }

    public function testResolveReturnsForwardedIpWhenProxyTrusted(): void
    {
        $request = (new ServerRequestFactory())->createServerRequest('GET', '/', [
            'REMOTE_ADDR' => '127.0.0.1',
            'HTTP_X_FORWARDED_FOR' => '203.0.113.10, 198.51.100.12',
        ]);

        $resolver = new ClientIpResolver(['127.0.0.1']);

        self::assertSame('203.0.113.10', $resolver->resolve($request));
    }

    public function testResolveFallsBackToRemoteAddrWhenForwardedIpInvalid(): void
    {
        $request = (new ServerRequestFactory())->createServerRequest('GET', '/', [
            'REMOTE_ADDR' => '127.0.0.1',
            'HTTP_X_FORWARDED_FOR' => 'not-an-ip',
        ]);

        $resolver = new ClientIpResolver(['*']);

        self::assertSame('127.0.0.1', $resolver->resolve($request));
    }
}