<?php
declare(strict_types=1);

namespace Phred\Tests;

use Nyholm\Psr7Server\ServerRequestCreator;
use Nyholm\Psr7\Factory\Psr17Factory;
use Phred\Http\Kernel;
use PHPUnit\Framework\TestCase;

final class ContentNegotiationTest extends TestCase
{
    private function kernel(): Kernel
    {
        return new Kernel();
    }

    private function request(string $method, string $uri, array $headers = []): \Psr\Http\Message\ServerRequestInterface
    {
        $psr17 = new Psr17Factory();
        $creator = new ServerRequestCreator($psr17, $psr17, $psr17, $psr17);
        $server = [
            'REQUEST_METHOD' => strtoupper($method),
            'REQUEST_URI' => $uri,
        ];
        return $creator->fromArrays($server, $headers, [], [], []);
    }

    public function testDefaultRestWhenNoAccept(): void
    {
        putenv('API_FORMAT'); // unset to use default
        $kernel = $this->kernel();
        $req = $this->request('GET', '/_phred/format');
        $res = $kernel->handle($req);
        $this->assertSame(200, $res->getStatusCode());
        $this->assertStringStartsWith('application/json', $res->getHeaderLine('Content-Type'));
        $data = json_decode((string) $res->getBody(), true);
        $this->assertIsArray($data);
        $this->assertSame('rest', $data['format'] ?? null);
    }

    public function testJsonApiWhenAcceptHeaderPresent(): void
    {
        putenv('API_FORMAT'); // unset
        $kernel = $this->kernel();
        $req = $this->request('GET', '/_phred/format', ['Accept' => 'application/vnd.api+json']);
        $res = $kernel->handle($req);
        $this->assertSame(200, $res->getStatusCode());
        $this->assertSame('application/vnd.api+json', $res->getHeaderLine('Content-Type'));
        $doc = json_decode((string) $res->getBody(), true);
        $this->assertIsArray($doc);
        $this->assertArrayHasKey('data', $doc);
        $this->assertSame('jsonapi', $doc['data']['format'] ?? null);
    }

    public function testEnvDefaultJsonApiWithoutAccept(): void
    {
        putenv('API_FORMAT=jsonapi');
        $kernel = $this->kernel();
        $req = $this->request('GET', '/_phred/format');
        $res = $kernel->handle($req);
        $this->assertSame(200, $res->getStatusCode());
        $this->assertSame('application/vnd.api+json', $res->getHeaderLine('Content-Type'));
        $doc = json_decode((string) $res->getBody(), true);
        $this->assertIsArray($doc);
        $this->assertArrayHasKey('data', $doc);
        $this->assertSame('jsonapi', $doc['data']['format'] ?? null);
    }
}