<?php

declare(strict_types=1);

namespace App\Handler;

use Mezzio\Hal\HalResponseFactory;
use Mezzio\Hal\ResourceGenerator;
use App\Entity\UserEntity;
use App\TableGateway\UserTableGateway;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\RequestHandlerInterface;
use SoBoRed\Mezzio\Rest\Exception\NoResourceFoundException;
use SoBoRed\Mezzio\Rest\RestDispatchTrait;

class GetUserHandler implements RequestHandlerInterface
{
    /**
     * @var UserTableGateway
     */
    private $userTable;

    /**
     * Use REST Helper RestDispatchTrait to gain
     * $this->resourceGenerator, $this->responseFactory,
     * and $this->createResponse()
     */
    use RestDispatchTrait;

    public function __construct(
        UserTableGateway $userTable,
        ResourceGenerator $resourceGenerator,
        HalResponseFactory $responseFactory
    )
    {
        $this->userTable = $userTable;
        $this->resourceGenerator = $resourceGenerator;
        $this->responseFactory = $responseFactory;
    }

    public function handle(ServerRequestInterface $request) : ResponseInterface
    {
        $id = $request->getAttribute('id', false);
        $user = $this->userTable->get((int)$id)->current();

        if (! $user instanceof UserEntity) {
            // Throw a REST Helper Exception for HAL-compliant problem details in response
            throw NoResourceFoundException::create("User with id `{$id}` not found");
        }

        // Return a HAL-compliant response that contains the record requested
        return $this->createResponse($request, $user);
    }
}