<?php

declare(strict_types=1);

namespace App\Handler;

use App\Service\AvatarService;
use finfo;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\RequestHandlerInterface;
use Zend\Diactoros\Response\TextResponse;

class AvatarHandler implements RequestHandlerInterface
{
    /** @var AvatarService  */
    private $avatarService;

    /**
     * AvatarHandler constructor.
     * @param AvatarService $avatarService
     */
    public function __construct(AvatarService $avatarService)
    {
        $this->avatarService = $avatarService;
    }

    /**
     * @param ServerRequestInterface $request
     * @return ResponseInterface
     */
    public function handle(ServerRequestInterface $request): ResponseInterface
    {
        $signum = $request->getAttribute('signum', false);
        try {
            $avatarImageData = $this->avatarService->getAvatarImageData($signum);
        } catch (\UnexpectedValueException $e) {
            return new TextResponse("Avatar not found", 404);
        }
        $finfo = new finfo(FILEINFO_MIME_TYPE);
        $contentType = $finfo->buffer($avatarImageData);
        return (new TextResponse($avatarImageData, 200, [
            'content-type' => $contentType,
        ]))->withHeader('Expires', '0')
            ->withHeader('Cache-Control', 'must-revalidate');
    }
}