<?php
declare(strict_types=1);

namespace Phred\Http\Responses;

use Nyholm\Psr7\Factory\Psr17Factory;
use Phred\Http\Contracts\ApiResponseFactoryInterface;
use Psr\Http\Message\ResponseInterface;

final class JsonApiResponseFactory implements ApiResponseFactoryInterface
{
    public function __construct(private Psr17Factory $psr17 = new Psr17Factory()) {}

    public function ok(array $data = []): ResponseInterface
    {
        return $this->document(['data' => $data], 200);
    }

    public function created(array $data = [], ?string $location = null): ResponseInterface
    {
        $res = $this->document(['data' => $data], 201);
        if ($location) {
            $res = $res->withHeader('Location', $location);
        }
        return $res;
    }

    public function noContent(): ResponseInterface
    {
        // JSON:API allows 204 without body
        return $this->psr17->createResponse(204);
    }

    public function error(int $status, string $title, ?string $detail = null, array $extra = []): ResponseInterface
    {
        $error = array_filter([
            'status' => (string) $status,
            'title' => $title,
            'detail' => $detail,
        ], static fn($v) => $v !== null && $v !== '');
        if (!empty($extra)) {
            $error = array_merge($error, $extra);
        }
        return $this->document(['errors' => [$error]], $status);
    }

    public function fromArray(array $payload, int $status = 200): ResponseInterface
    {
        // Caller must ensure payload is a valid JSON:API document shape
        return $this->document($payload, $status);
    }

    /**
     * @param array<string,mixed> $doc
     */
    private function document(array $doc, int $status): ResponseInterface
    {
        $res = $this->psr17->createResponse($status)
            ->withHeader('Content-Type', 'application/vnd.api+json');
        $res->getBody()->write(json_encode($doc, JSON_UNESCAPED_SLASHES));
        return $res;
    }
}